Virus:TR/NSAnti.B.3
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:30.855 Bytes
MD5 checksum:7ef7d92faee21f9940dd89140A231ef0
VDF version:6.35.01.15

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Trojan-PSW.Win32.Lmir.ayt
   •  TrendMicro: TSPY_DELF.BVH
   •  Bitdefender: Trojan.NSAnti.B


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003


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

 Files It copies itself to the following locations:
   • %WINDIR%\help\ZTpass.exe
   • %WINDIR%\help\ZTYX.CHI



The following file is created:

– %WINDIR%\help\ZThook.dll Further investigation pointed out that this file is malware, too. Detected as: TR/PSW.Lmir.awj.1

 Registry The following registry keys are added in order to load the service after reboot:

– [HKLM\SYSTEM\CurrentControlSet\Services\ZTmassacre]
   • "Type"=dword:00000110
   • "Start"=dword:00000002
   • "ErrorControl"=dword:00000000
   • "ImagePath"="%WINDIR%\help\ZTpass.exe"
   • "DisplayName"="ZT Massacre"
   • "ObjectName"="LocalSystem"
   • "Description"="ZTmassacre"

– [HKLM\SYSTEM\CurrentControlSet\Services\ZTmassacre\Security]
   • "Security"=%hex values%

– [HKLM\SYSTEM\CurrentControlSet\Services\ZTmassacre\Enum]
   • "0"="Root\\LEGACY_ZTMASSACRE\\0000"
   • "Count"=dword:00000001
   • "NextInstance"=dword:00000001

 Miscellaneous Internet connection:

It queries with the name:
   • yhb1978.3322.org

 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 Daniel Constantin on Wednesday, August 9, 2006
Description updated by Daniel Constantin on Wednesday, August 9, 2006

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