Virus:W32/Sality.Q

Threat description

Details

CATEGORYMalware
TYPEVirus
DATE DISCOVEREDAugust 14, 2006

Summary

A program that secretly and maliciously integrates itself into program or data files. It spreads by integrating itself into more files each time the host program is run.



Removal

Automatic action

Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.

More scanning & removal options

More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

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Technical Details

Virus:W32/Sality.Q is an appending polymorphic file infector virus that uses an Entry Point Obscuring (EPO) technique. Unlike other file infectors that modify the entry point of the host file to point to the virus code, Sality.Q replaces 122 bytes from the beginning code of the host file with its decryption routine and hides it in its code. It stores the original code 1,422 bytes away from the start of the last section.

Execution

When the infected executable file has been run, it will drop the following DLL components:

  • %windir%\system32\vcmgcd32.dll
  • %windir%\system32\vcmgcd32.dl_

It will then load the vcmgcd32.dll file, which contains the malicious routine. After successfully installing its components, it will then execute the original host file's code to prevent the user from suspecting infection.

Infection

Sality.Q can infect any of the following extensions by searching for files starting from "C:\":

  • .exe
  • .scr

It also infects files with .EXE extensions that are referenced as data in the following registry keys:

  • [HKCU\Software\Microsoft\Windows\CurrentVersion\run]
  • [HLKM\Software\Microsoft\Windows\CurrentVersion\run]

Sality.Q appends itself by creating a new section with a section name of "{random characters}data" and has a size of 20480 Bytes.

Activity

Sality attempts to delete files and processes related to some antivirus products. It also attempts to delete files that it finds with any of the following extensions:

  • .avc
  • .key
  • .vdb

It will try to delete files with filenames starting with any of the following strings:

  • ALER
  • ANDA
  • ANTI
  • AVP
  • BIDEF
  • CLEAN
  • GUAR
  • KAV
  • NOD
  • OUTP
  • SCAN
  • TREN
  • TROJ
  • ZONE

It may also kill processes that starts with the following strings:

  • ANTI
  • ATGUARD
  • AUTOTRACE
  • AVGSERV
  • AVLTMAIN
  • AVP
  • AVPROTECT
  • AVSYNMGR
  • AVXQUAR
  • BIDEF
  • BIDSERVER
  • BIPCP
  • BLACKICE
  • CLEANER
  • DRWATSON
  • DRWEB
  • DRWTSN32
  • ESCANH
  • ICSSUPPNT
  • ICSUPP
  • KAV
  • LOCKDOWN
  • MCAGENT
  • MCUPDATE
  • MGUI
  • NAV
  • NMAIN
  • NOD32
  • NPFMESSENGER
  • NPROTECT
  • NUPGRADE
  • OUTPOST
  • PERISCOPE
  • PINGSCAN
  • PORTDETECTIVE
  • PROTECTX
  • RTVSCAN
  • SAVSCAN
  • TRJSCAN
  • VSMAIN
  • ZONEALARM

It checks for an Internet connection by querying:

  • www.microsoft.com

It then attempts to connect to the following URLs:

  • www.f5ds1jkkk4d.info
  • www.g1ikdcvns3sdsal.info
  • www.h7smcnrwlsdn34fgv.info
  • www.hkukud123ncs.info
  • www.inform1ongung.info
  • www.kukutrustnet.org
  • www.kukutrustnet7.com
  • www.kukutrustnet7.info
  • www.lukki6nd2kdnc.info
Registry

During installation, the worm creates the following mutexes to make sure that only one instance of its .dll component is running in memory:

  • KUKU300a
  • KUKU301a
  • _kuku_joker_v3.09_

It also modifies %windir%\SYSTEM.INI by adding a section called MCIDRV_VER with key DEVICE and putting a random value inside it.Example:

  • [MCIDRV_VER] DEVICE=566828orapm40409

The .DLL component can steal cached passwords and also has key logging capabilities. It is injected in all running processes.

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