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BackDoor.IRC.Aryan.1

Added to the Dr.Web virus database: 2012-05-26

Virus description added:

A backdoor that can be distributed as autorun.inf and can infect all removable disks except for A: and B:. Data on successful completion of the infection process is transmitted via IRC. Moreover, BackDoor.IRC.Aryan.1 can infect removable media using the following routine: first, the bot replicates itself to the device, creates a new folder, and then transfers files from the root folder to the newly created one. After that, the malicious program plants shortcuts to original files and its own files into the root folder. Data on successful completion of the infection process is transmitted via IRC.

If the bot is launched from the removable media device, it runs a search for the cmd.exe process and kills it.

Then it copies itself to %APPDATA% assigning it with HRS attributes and registers this copy in HKCU(HKLM)\SOFTWARE\Microsoft\Windows\CurrentVersion\Run.

The malicious program constantly verifies that its executable file is present on the hard drive. If the file is missing, the bot reads itself from the drive and then loads the executable from the memory. At the same time, the backdoor checks the autorun key and, when necessary, modifies it.

The malware attempts to inject one malicious module into csrss.exe, alg.exe, dwm.exe. The module is responsible for restarting the Trojan.

BackDoor.IRC.Aryan.1 tries to inject the payload into explorer.exe. If this operation is unsuccessful, the Trojan initiates a separate thread to execute the payload.

BackDoor.IRC.Aryan.1 can download and run files specified by cybercriminals and launch DoS attacks on a command from IRC server.

Curing recommendations

  1. If the operating system (OS) can be loaded (either normally or in safe mode), download Dr.Web Security Space and run a full scan of your computer and removable media you use. More about Dr.Web Security Space.
  2. If you cannot boot the OS, change the BIOS settings to boot your system from a CD or USB drive. Download the image of the emergency system repair disk Dr.Web® LiveDisk , mount it on a USB drive or burn it to a CD/DVD. After booting up with this media, run a full scan and cure all the detected threats.
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After booting up, run a full scan of all disk partitions with Dr.Web Anti-virus for Linux.

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  1. If the mobile device is operating normally, download and install Dr.Web for Android. Run a full system scan and follow recommendations to neutralize the detected threats.
  2. If the mobile device has been locked by Android.Locker ransomware (the message on the screen tells you that you have broken some law or demands a set ransom amount; or you will see some other announcement that prevents you from using the handheld normally), do the following:
    • Load your smartphone 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 Dr.Web for Android onto the infected handheld and run a full scan of the system; follow the steps recommended for neutralizing the threats that have been detected;
    • Switch off your device and turn it on as normal.

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