TR/Drop.Agent.70774 - Trojan

See also

Summary

Full description

Statistics

Virus:	TR/Drop.Agent.70774
Type:	Trojan
Subtype:	Dropper
In the wild:	No
Reported Infections:	High
Distribution Potential:	Low
Damage Potential:	Low to medium
Static file:	Yes
File size:	70.774 Bytes
MD5 checksum:	72B8E2CD965F54FE924CBA585E64D216
VDF version:	6.38.01.135 - Mon, 14 May 2007 17:51 (GMT+1)
IVDF version:	6.38.01.141 - Mon, 14 May 2007 17:51 (GMT+1)

General Aliases:
   • Mcafee: Spy-Agent.bw trojan
   • Kaspersky: Trojan.Win32.Buzus.gyj
   • F-Secure: Trojan.Win32.Buzus.gyj
   • Sophos: Mal/Packer
   • Eset: Win32/Wigon.BC trojan
   • Bitdefender: Trojan.Spy.WSNPoem.CN

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

Side effects:
   • Drops a malicious file
   • Registry modification

Files The following file is created:

– %sysdir%\ntos.exe Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too. Detected as: TR/Spy.Buzus.gyj

Registry The following registry key is changed:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
New value:
• "Userinit"="%SYSDIR%\userinit.exe,%SYSDIR%\ntos.exe,"

Injection – It injects the following file into a process: ntos.exe

Process name:
• winlogon.exe

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

See a brief description here.

Description inserted by Irina Diaconescu on Fri, 23 May 2008 14:23 (GMT+1)
Description updated by Irina Diaconescu on Fri, 30 May 2008 11:55 (GMT+1)

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