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BackDoor.RatPack

Added to the Dr.Web virus database: 2015-10-23

Virus description added:

SHA1

  • 785f12821bd3a0adb94b277271fa81d1cadd0d8b—RTF (exploit)
  • 89b28711270a891b0a04483ca8e2bb967def35bb—downloader
  • 842688f077493d84c0d7127170558eb362bf9016—installer
  • 7b5be45e9ca77fb091a5bed34860e66ba706e085—application package (lmpack1.exe)
  • 115d4b6b80096b71d50a4f2c64fbe13bef8d04f9—application package (pn_pack1.exe)

A pack of applications designed to provide cybercriminals with unauthorized access to compromised computers. It is distributed with the help of Exploit.CVE2012-0158.121 and in the guise of an RTF document. Once the document is opened, a malicious file is decrypted and saved to the victim's computer. The file has a valid digital signature (like almost any other file from BackDoor.RatPack).

If fact, this downloader is an installer in NSIS (Nullsoft Scriptable Install System) format.

Once launched, the installer scans the system for virtual machines, monitoring programs, and debuggers. Then it initiates a search for online banking applications of several Russian financial organizations:

*ICPortalSSL *sib.taatta.net *isfront.priovtb.com *ISAPIgate.dll *bsi.dll *PortalSSL *IIS-Gate.dll *beta.mcb.ru *ibank *ibrs *iclient *e-plat.mdmbank.com *sberweb.zubsb.ru *ibc *elbrus *i-elba *clbank.minbank.ru *chelindbank.ru/online/ *uwagb *wwwbank *dbo *ib.

If all the checks are successful, the installer connects to a remote server and downloads and runs another installer (install.cab) in NSIS format that contains the following files:

  • setup.bin—7z archive
  • setup1.bi—7z archive
  • 7za.exe

This second installer extracts executable files from password-protected archives and runs them.

setup.bin:

  • lmpack1.exe
  • pn_pack1.exe

setup1.bin:

  • pskill.exe

The lmpack.exe file is an installer in NSI format that contains an installation script and the following files:

7za.exe
FileTouch.exe
_??
a32.bin
a64.bin
files0.bin
files1.bin
files2.bin
files4.bin
files5.bin
h1.bin
n32.bin
n64.bin
p1.bin
setup1.bin

The pn_pack1.exe file is an installer that contains an installation script and the following files:

FileTouch.exe
7za.exe
files3.bin
hh.bin
files0.bin
files4.bin
setup.bin

The installer payload bears a modification of a shareware program called Remote Office Manager—Doctor Web security researchers have detected at least three versions of this program that differ in configuration settings. By intercepting a number of system functions, the malicious program is able to conceal the tool's shortcuts in the Windows taskbar and notification area preventing the user from detecting the program.

News about this threat

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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Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.

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.

Find out more about Dr.Web for Android

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