Virus:TR/NSAnti.B.4
Date discovered:28/07/2006
Type:Trojan
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Medium
Static file:Yes
File size:47.235 Bytes
MD5 checksum:6fa72cbba8f23eae2797557c704095e5
VDF version:6.35.01.15 - Friday, July 28, 2006
IVDF version:6.35.01.15 - Friday, July 28, 2006

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Symantec: Trojan.PWS.QQPass
   •  Kaspersky: Trojan-PSW.Win32.QQPass.jg
   •  TrendMicro: TSPY_QQPASS.QW
   •  Bitdefender: Trojan.NSAnti.B


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows ME


Side effects:
   • Drops a malicious file
   • Records keystrokes
   • Registry modification
   • Steals information

 Files It copies itself to the following location:
   • %SYSDIR%\SVOHOST.EXE



It deletes the initially executed copy of itself.



It deletes the following files:
   • %SYSDIR%\KAKATOOL.DLL
   • %SYSDIR%\DQHX.TXT



The following file is created:

– %SYSDIR%\WINSCOK.DLL Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.QQPass.JG

 Registry The following registry key is added in order to run the process after reboot:

– HKLM\Software\Microsoft\Windows\CurrentVersion\Run
   • "SoundMam"="%SYSDIR%\SVOHOST.exe"



The values of the following registry keys are removed:

–  HKLM\Software\Microsoft\Windows\CurrentVersion\Run
   • RavTask
   • KvMonXP
   • YLive.exe
   • yassistse
   • KAVPersonal50
   • NTdhcp
   • Winhoxt



The following registry key is added:

– HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
   • "hx-1"="%number%"



The following registry key is changed:

– HKLM\Software\Microsoft\Windows\CurrentVersion\explorer\Advanced\
   Folder\Hidden\SHOWALL
   New value:
   • "CheckedValue"="0"

 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Ionut Slaveanu on Wednesday, August 9, 2006
Description updated by Andrei Ivanes on Monday, August 28, 2006

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