• Tag Archives Computer Virus
  • Ransomware developers look to educate victims and Help Decrypt files

    Knowledge is good, At least according to the cybercriminals who are developing ransomware that will give a free decryption key if the victim reads two articles about ransomware.

    A new variant of Koolova was discovered by security researcher Michael Gillespie, that demands the victim read two articles: a Google Security Blog, Stay safe while browsing, and a Bleeping Computer article, Jigsaw Ransomware Decrypted: Will delete your files until you pay the Ransom.

    Lawrence Abrams, said the ransomware itself behaves like Jigsaw in that once it encrypts the files it delivers a scrolling note telling the victim to read stories or else risk having their files deleted. In Jigsaw’s case the demand is for a ransom payment.


  • CTB-Locker ransomware spreading through fake Windows 10 Update emails

    With the highly publicized release of Microsoft’s Windows 10 on July 29th, scammers and malware developers were quick to jump in and use it as a method of distributing malware. Cisco’s Talos Group has discovered a email campaign underway that pretends to be from Microsoft and contains an attachment that will supposedly allow you to upgrade to Windows 10. In reality, though, this email is fake and once you double-click on the attached file, you will instead become infected with the encrypting ransomware CTB-Locker.

    win10_blacked_out.png

    Image of fake Windows Update Email courtesy of Cisco

    As you can see the email pretends to be from the email address update@microsoft.com and contains the subject [b]Windows 10 Free Update. Even the email message looks legitimate with no spelling mistakes or strange grammar. This is because the content is copied directly from Microsoft’s site. The only tell-tale sign is that there will be some characters that do not render properly. Unfortunately, this small sign will not be enough for many people to notice.

    Furthermore, once they download the attachment and extract it, the attached Win10Installer.exe icon will be the familiar Windows 10 logo.

    It isn’t until you inspect the file properties of the attachment, do you see that something is not right as its file description will be iMacros Web Automation and the copyright for the program will belong to Ipswitch. Ipswitch is a legitimate company and not the ones who released this malware.

    Finally, if a user double-clicks on the Win10Installer.exe file, they will not be greeted with the normal Windows 10 upgrade screen. Instead, after a brief delay they will be shown the screen for the CTB-Locker ransomware.

    CTB-Locker Computer Virus removal and data file recovery service. Local and Online service. Fort Lauderdale,Miami, Boca Raton and all South florida
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    At this point, the computer’s data will be encrypted and there is not much that can be done about it.

     

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  • Malicious Ads on Yahoo, AOL, Match.com, Trigger CryptoWall Infections

    cryptowall

    Attackers have been leveraging the FlashPack Exploit Kit to peddle the CryptoWall 2.0 ransomware on unsuspecting visitors to sites such as Yahoo, The Atlantic and AOL. Researchers believe that for about a month the malvertising campaign hit up to 3 million visitors and netted the attackers $25,000 daily.

    According to experts at Proofpoint, a firm that primarily specializes in email security, the exploit kit targeted a vulnerability in Adobe Flash via users’ browsers to install the ransomware on users’ machines.

    Malvertising is an attack that happens when attackers embed malicious code – in this case code that led to the latest iteration of CryptoWall – into otherwise legitimate ads to spread malware via drive-by downloads. Users can often be infected without even clicking on anything.

    CryptoWall, which takes users’ files, encrypts them with rigid RSA-2048 encryption, then asks for a fee to decrypt them, made a killing earlier this summer. In August it was reported that the ransomware made more than $1.1 million for its creators in just six months.

    Similar to Critoni/Onion, a ransomware dug up in July, CryptoWall 2.0 downloads a TOR client on the victim’s machine, connects to a command and control server and demands users send Bitcoin – $500 worth – to decrypt their files. Since the campaign lasted about a month, from Sept. 18 to this past Saturday, researchers are estimating that 40 of the campaign’s Bitcoin addresses collected at least 65 BTC each, a number that roughly translates to $25,000 a day.

    cryptowall1

    Proofpoint claims that high ranking sites such as AOL, The Atlantic, Match.com and several Yahoo subdomains such as their Sports, Fantasy Sports and Finance sites, were spotted serving up the tainted ads. Other sites lesser known in the U.S. such as Australia’s Sydney Morning Herald, The Age, and the Brisbane Times, were reportedly also doling out the ads.

    While the campaign started a month ago the firm claims things didn’t start to ramp up until recently.

    “After crossing a threshold level, it became possible to associate the disparate instances with a single campaign impacting numerous, high-traffic sites,” Wayne Huang, the company’s VP of Engineering, said of the campaign.

    The firm claims it worked quickly to notify those involved in the campaign, including the ad providers, and as of this week, believes the situation has been nullified.

    Last month researchers with Barracuda Labs found a CryptoWall variant with certificate signed by Comodo being distributed through ads on a handful of different websites. None of those sites were nearly as trafficked as those spotted by this most recent campaign however. The Alexa rankings for Yahoo (4), AOL (37), Match (203), and The Atlantic (386) place them within the top 500 of the internet’s most popular sites, something that likely upped the campaign’s exposure level.

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  • Keylogger Optimized with AutoIT Infected Thousands of Computers

    A new surge of malware has been discovered which goes on to infect hundreds of thousands of computers worldwide and allegedly steals users’ social and banking site credentials.

     

    Few days back, a list of 5 million combinations of Gmail addresses and passwords were leaked online. The search engine giant, Google said that Gmail credentials didn’t come from the security breaches of its system, rather the credentials had been stolen by phishing campaigns and unauthorized access to user accounts.

     

    Just now, we come across another similar incident where cyber criminals are using a malware which has already compromised thousands of Windows users worldwide in an effort to steal their Social Media account, Online account and Banking account Credentials.

     

    A Greek Security Researcher recently discovered a malware sample via a spam campaign (caught in a corporate honeypot), targeting large number of computers users rapidly. He investigated and posted a detailed technical analyses of the malware on his blog.

     

    After reverse engineer the malware sample file, he found that the cybercriminals are using a combination of software AutoIT (Automate day-to-day tasks on computers) and a “commercial” Keylogger named “Limitless Keylogger” to make it FUD i.e. Fully Undetectable from static analysis.

     

    Keylogger is a critical type of software program for cyber criminals, which records every input typed into the keyboard and easily detects passwords for users’ Email accounts, Social Media accounts and Online Bank accounts.

     

    This malicious application captures every keystrokes users press and send them to a specified email address linked to the cyber criminal. More interestingly, the malware uses AutoIT in order to evade detection by Antivirus programs.

     

    Limitless Keylogger Optimized with AutoIT Infected thousands of Computers

     

    The malware distributed in the spam campaign comes as a WinRAR SFX executable file with a custom icon which drops 4 malicious files onto the victim’s computers with hidden and system attributes.

     

    The Malware archive includes:

     

    • AutoIT script ‘update.exe’ of 331MB
    • Python script to “deobfuscate” AutoIT script
    • oziryzkvvcpm.AWX – Settings for AutoIT script
    • sgym.VQA – Another Encrypted malware/Payload Binary
    Initially the obfuscated AutoIT Script is of size 331MB, because it contains lots of garbage content, but after deobfuscate process it becomes only 55kbyte in size with clean malicious code.

     

    Researcher found lot of functions and various functionalities in the malware code those allow the malicious software to protect itself from detection.

     

    On Further reserve engineering, he found that the malware sends the collected keystroke data to the cybercriminal via SMTP email server. So he sniffed the whole conversation of malware SMTP traffic and discovered that the keylogger was sending all keystrokes of the user, screenshots, recovery data (saved passwords from several applications/browsers) to an email ID – “ontherun4sales@yandex.ru”.

     

    He also extracted the hardcoded SMTP email ID username and passwords of the respective Yandex mail address from the malware source code.
    Limitless Keylogger Optimized with AutoIT Infected thousands of Computers
    Researcher told SecNews, “The detection was accomplished in the past few days and found that the malware was being Greek is targeting users (minimum numerical cases).
    Possibly some Indonesian hackers might have used the malicious software available on the Russian hacking forum sites” they said. “and the targets are well known companies from retail industry,oil,airlines etc
    At last, the researcher also disclosed some online FTP servers using Google hacks, where the data has been uploaded by the different variants of the Limitless Logger by various hacking groups.

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  • Rise in Anti-Child Porn Spam Protection Ransomware infections

    This ransomware pretends to be from a legitimate government organization that states that the infected computer is sending out SPAM that contains links to child pornography sites. The ransom program then states that in order protect yourself, and others, it has encrypted your data using Advanced Encryption Standards, or AES, encryption. Just like the Malware Protection and the ACCDFISA Protection Program variants, these files are not actually encrypted but are password protected RAR files.

    sl.png

    ScreenLocker window for ACCDFISA v2.0, There are actually a few different versions of this. ACCDFISA v2.0 HTML file, These can be worded slightly different, and can have different emails to message the virus creator.

    There seems to be either a leak of the ACCDFISA v2.0 source, or the creator is mixing up the layout of Ransom Note, Screen Locker, and even the internal code. So far I have found 3 different version of ACCDFISA v2.0 with different contact emails, Ransom Notes, Code, and what is worse is even the method of delivery. The previous ACCDFISA v2.0 mostly only affected servers with RDP enabled with weak security. But the last 2 victims I have been messaging had neither a server or RDP enabled, and claimed to have gotten it either by email or a malicious or hacked site. This makes this older modified infection another top placer for worst encrypting infections because the key is unrecoverable, Restore Points are wiped, the computer is locked down, services are mangled, free space and deleted files are wiped with SDelete, and of course files are encrypted with WinRar SFX AES exe’s.

    For informational purposes, the 2 virus creator emails I have found with these variants are brhelpinfo@gmail.com and Dextreme88@gmail.com.

    When first run, this program will scan your computer for data files and convert them to password protected RAR .exe files. These password protected data files will be named in a format similar to test.txt(!! to decrypt email id <id> to <Email>@gmail.com !!).exe. It will then use Sysinternal’s SDelete to delete the original files in such a way that they cannot be undeleted using file recovery tools. It will also set a Windows Registry Run entry to start c:\<Random Number>\svchost.exe when your computer starts. This program is launched immediately when you logon and blocks access to your Windows environment. If you boot your computer using SafeMode, Windows Recovery disk, or another offline recovery CD, you can delete or rename the c:\<Random Number>\svchost.exe file in order to regain access to your Windows Desktop. This “lockout” screen will also prompt you to send the hackers the ransom in order to get a passcode for the system lockout screen and for your password protected files.

    This variant took 3 hours to completely finish on my VM. I was able to access the key file, and decrypt nearly all files and back them up before shutdown. So if you are lucky enough to see this happening, you should immediately backup the key file on the desktop / in the ProgramData folder.

    Sadly, just like the past variants, files cannot be decrypted either without the key, or a backup. If you are reading this infection free I have one question, Have you backed up today?. If not, you better get to it as these types of computer infections are on the rise and definitely here to stay!

    The files that this infection creates when it is installed are:

    File List:

    c:\<Random>\svchost.exe – ScreenLocker / Decrypter

    c:\<Random>\howtodecryptaesfiles.htm – RansomNote that all RansomNotes lnk’s point to

    c:\ProgramData\fdst<Random>\lsassw86s.exe Encrypter / Main dropper

    c:\ProgramData\<Random>\<Random>.dll – Different Numbers and Hashes used by the infection / Also where Temp Key is kept, But removed after completion

    c:\ProgramData\<Random>\<Random>.DLLS List of files to be infected by WinRar

    c:\ProgramData\<Random>\svchost.exe – WinRar CUI renamed

    c:\ProgramData\<Random>\svchost.exe – Sdelete Renamed

    c:\ProgramData\svcfnmainstvestvs\stppthmainfv.dll List of Numbers used by the infection

    c:\ProgramData\svtstcrs\stppthmainfv.dll List of Numbers used by the infection

    c:\Windows\System32\backgrounds2.bmp Renamed ScreenLocker / Decrypter, Used to replace the one in ProgramData if deleted

    c:\Windows\System32\lsassw86s.exe Renamed Encrypter / Main dropper, Used to replace the one in ProgramData if deleted

    c:\Windows\System32\scsvserv.exe Used to complete mangle / disable services to further lock down computer

    c:\Windows\System32\lsassvrtdbks.exe Assists with encryption

    c:\Windows\System32\session455.txt Temp Storage used with .BAT file to logoff user account

    c:\Windows\System32\decryptaesfiles.html Used to copy to ProgramData

    c:\Windows\System32\Sdelete.dll Used to copy Sdelete to ProgramData

    c:\Windows\System32\kblockdll.dll Used to Lock desktop

    c:\Windows\System32\btlogoffusrsmtv.bat Used to log user off

    c:\Windows\System32\default2.sfx Used with winrar to encrypt files

    c:\Windows\System32\cfwin32.dll WinRar CUI renamed

    %Desktop%\<Random>.Txt – Also contains Decrypt Key, But removed after completion

    Registry List:

    HKLM\Software\Microsoft\Windows\CurrentVersion\Run C:\<Random>\svchost.exe – Launches ScreenLocker

    HKCU\Software\Microsoft\Windows\CurrentVersion\Run C:\<Random>\svchost.exe – Launches ScreenLocker

    HKLM\Software\Microsoft\Windows\CurrentVersion\Run C:\ProgramData\<Random>\svchost.exe – Launches ScreenLocker

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  • Virus Removal Tech In South Florida Miami, Fort Lauderdale and Boca Raton

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  • Cryptowall Ransomware Spreading on the internet rapidly through advertisements

    Cryptowall Lock Malware spyware spreading
    Cryptowall Lock Malware

     

    Ransomware is an emerging threat in the evolution of cybercriminals techniques to part you from your money. Typically, the malicious software either lock victim’s computer system or encrypt the documents and files on it, in order to extort money from the victims.

    Though earlier we saw the samples of Ransomware tended to be simple with dogged determinations to extort money from victims. But with the exponential rise in the samples of Ransomware malwares, the recent ones are more subtle in design, including Cryptolocker, Icepole, PrisonLocker, CryptoDefense and its variants.

    Now, the ransomware dubbed as Cryptowall, a latest variant of the infamous ransomware Cryptolocker is targeting users by forcing them to download the malicious software by through advertising on the high profile domains belonging to Disney, Facebook, The Guardian newspaper and others.

    Cryptolocker is designed by the same malware developer who created the sophisticated CryptoDefense (Trojan.Cryptodefense) ransomware, appeared in the end of March, that holds the victims’ computer files hostage by wrapping them with strong RSA 2048 encryption until the victim pays a ransom fee to get them decrypted.

    But unfortunately, the malware author failed to realize that he left the decryption keys left concealed on the user’s computer in a file folder with application data.

    So, to overcome this, the developer created Cryptowall ransomware and alike the latest versions of CryptoDefense, the infected system’s files and documents encrypted by CryptoWall are impossible to decrypt.

    The story broke, when researchers at Cisco revealed that cybercriminals have started targeting people with RIG Exploit Kits (EK) to distribute malicious Cryptowall ransomware malware.

    The Rig Exploit Kit was first spotted by Kahu Security in April, which checks for an unpatched version of Flash, Internet Explorer, Java or the Silverlight multimedia program on the infected users and if found, the system is instantly exploited by the bad actors.

    Researchers at Cisco have noticed high levels of traffic consistent with the new “RIG” exploit kit, thereby blocking requests to over 90 domains. On further investigation, the company observed that many of its Cloud Web Security (CWS) users were visiting on those malicious domains after clicking advertisements on high-profile domains such as “apps.facebook.com,” “awkwardfamilyphotos.com,” “theguardian.co.uk” and “go.com,” and many others.

    cryptowall ransomware If clicked, the advertisements redirect victims to one of those malicious domains in order to malvertise users and once the system get infected with the RIG Exploit Kit, it will deliver the payload which includes the Cryptowall Ransomware malware.

    Now, when this CryptoWall is installed in the infected system, it will start scanning the system Hard Drive for data files and encrypt them.

    After encrypting the files on victim’s system, it will create files containing ransom instructions in every folder it had encrypted, demanding up to $500 USD. The service where users are instructed to pay the ransom amount is a hidden service that uses the Command-and-Control server hosted on TOR .onion domain.

    The largest share of infections, some 42 percent, are in the United States, followed by England and Australia, but it believes that several groups and bad actors are involved in this attack chain.

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    Cryptowall Lock Malware
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  • NEW VIRUS – Windows Safety Master Virus Windows PC Computers

    Windows Safety Master is a rogue anti-spyware program from the Rogue.FakeVimes family of computer infections. This program is considered scareware because it displays fake scan results, fake security warnings, and does not allow you to run programs on your computer. Windows Safety Master is distributed through web sites that display a fake online virus scanner that states your computer is infected and then prompts you to download the installation file. This infection is also promoted by hacked web sites that contain exploit code that tries to install the infection on your computer without your permission or knowledge.

    When Windows Safety Master is installed it will be configured to automatically start when you login to Windows. Once started, it will pretend to scan your computer and then states that there are numerous infections present. If you attempt to remove any of these supposed infections, the program will state that you first need to purchase a license before being allowed to do so. As all of the scan results are false, please ignore any prompts to purchase the program.

    Windows Safety Master screen shot

     

    To protect itself from being removed, Windows Safety Master will also block you from running any legitimate application on your computer. It does this to prevent you from running legitimate security software that may detect it as an infection and remove it. The message that you will see when you attempt to run a program is:

    Firewall has blocked a program from accessing the Internet
    C:\Program Files\Internet Explorer\iexplore.exe
    is suspected to have infected your PC.
    This type of virus intercepts entered data and transmits them
    to a remote server.

    When you see this message please ignore it as your programs are not infected and will work normally after this infection is removed.

    While Windows Safety Master is running it will also display fake security alerts that are designed to make you think your computer has a severe security problem. Some of these warnings include:

    Error
    Trojan activity detected. System integrity at risk.
    Full system scan is highly recommended.

    Error
    System data security is at risk!
    To prevent potential PC errors, run a full system scan.

    Warning! Identity theft attempt detected
    Hidden connection IP: xx.xxx.xxx.xxx
    Target: Microsoft Corporation keys
    Your IP: 127.0.0.1

    Just like the scan results, these warnings are fake and can be ignored.

    As you can see, this infection was created for the sole reason of scaring you into purchasing it. It goes without saying that you should definitely not purchase Windows Safety Master, and if you already have, please contact your credit card company and dispute the charges stating that the program is a scam and a computer virus. To remove Windows Safety Master and other related malware, PLEASE VISIT OUR WEBSITE

    CALL – COMPUTER REPAIR at 754-234-5598 if you are infected by any of these viruses.

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  • Windows Efficiency Kit Virus

    Windows Efficiency Kit is a rogue anti-spyware program from the Rogue.FakeVimes family of computer infections. This program is considered scareware because it displays false scan results, fake security warnings, and does not allow you to access your legitimate Windows applications. Windows Efficiency Kit is distributed through web sites that display a fake online virus scanner that states your computer is infected and then prompts you to download the installation file. This infection is also promoted by hacked web sites that contain exploit code that tries to install the infection on your computer without your permission or knowledge.

    Once Windows Efficiency Kit is installed it will be configured to automatically start when you login to Windows. Once started, it will pretend to scan your computer and then states that there are numerous infections present. If you attempt to remove any of these supposed infections, the program will state that you first need to purchase a license before being allowed to do so. As all of the scan results are false, please ignore any prompts to purchase the program.

    Windows Efficiency Kit screen shot

    To protect itself from being removed, Windows Efficiency Kit will also block you from running any legitimate application on your computer. It does this to prevent you from running legitimate security software that may detect it as an infection and remove it. The message that you will see when you attempt to run a program is:

    Firewall has blocked a program from accessing the Internet

    Internet Explorer
    C:\Program Files\Internet Explorer\iexplore.exe

    is suspected to have infected your PC.
    This type of virus intercepts entered data and transmits them
    to a remote server.

    When you see this message please ignore it as your programs are not infected and will work normally after this infection is removed.

    While Windows Efficiency Kit is running it will also display fake security alerts that are designed to make you think your computer has a severe security problem. Some of these warnings include:

    Error
    There’s a suspicious software running on your PC. For more details, run a system file check.

    Error
    Trojan activity detected. System data security is at risk. It is recommended to activate protection and run a fully system scan.

    Just like the scan results, these warnings are fake and can be ignored.

    Without a doubt, this infection was created for the sole reason of scaring you into purchasing it. It goes without saying that you should definitely not purchase Windows Efficiency Kit, and if you already have, please contact your credit card company and dispute the charges stating that the program is a scam and a computer virus. To remove Windows Efficiency Kit and other related malware, PLEASE VISIT OUR WEBSITE

    CALL – COMPUTER REPAIR at 754-234-5598 if you are infected by any of these viruses.

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  • Apple Mac OS X Flashback Trojan Is still Alive, Recently Infected 22,000 Machines

    The Flashback Trojan, the most sophisticated piece of malware that infected over 600,000 Apple’s Macs systems back in April, 2012 is still alive and has infected about 22,000 machines recently, according to the researchers from Intego.

    For a refresh, Flashback Trojan was first discovered in September 2011, basically a trojan horse that uses a social engineering to trick users into installing a malicious Flash player package.

    Once installed, the Flashback malware injects a code into that web browser and other applications like Skype to harvest passwords and other information from those program’s users. The Trojan targets a known vulnerability in Java on Mac OS X systems.

    The system gets infected after the user redirects to a compromised website, where a malicious javascript code to load the exploit with Java applets. Then an executable file is saved on the local machine, which is used to download and run malicious code from a remote location.

    It took Apple months to recognize the severity of this Mac malware threat, which first appeared in the Fall of 2011. However, Apple released the patch and updated the specific introduction about the operating system,“It doesn’t get PC viruses” to “It’s built to be safe.” on the Apple website. Intego said:

    “The Apple Product Security Response team took serious actions in 2012 to mitigate the threat using XProtect and other security updates (including a Malware Removal Tool), however, the botnet count was only divided by six according to our sinkhole.

    Now in 2014, Intego researcher Abbati claims that Flashback botnet is still alive and is silently “adrift.”

    “Intego purchased some of the command and control (C&C) server domain names to monitor the Flashback threat that infected hundreds of thousands of Macs. Beginning January 2, we studied those domains and our sinkhole servers recorded all connections from Macs where Flashback is still active and trying to contact the C&C servers.

     

    Flashback botnet On April 2012, the Mac world was stunned to learn that the Flashback Trojan had infected millions of machines. The Flashback Ad-clicking the component tool that caused infected Macs to view sponsored links that had the potential to generate millions of dollars in fraudulent ad revenue. In addition, it has the capability to do much more, including sending spam, engaging in denial-of-service attacks, or logging passwords.

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