TR/Spy.ZBot.DFO - Trojan

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Summary

Full description

Statistics

Virus:	TR/Spy.ZBot.DFO
Date discovered:	20/08/2008
Type:	Trojan
In the wild:	Yes
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Medium
Static file:	Yes
File size:	73.216 Bytes
MD5 checksum:	df73c2b3562ef157c10ba1a16b4c8885
IVDF version:	7.00.06.45 - Wed, 20 Aug 2008 17:13 (GMT+1)

General Method of propagation:
   • No own spreading routine

Aliases:
   • Symantec: Backdoor.Paproxy
   • Mcafee: New Malware.ix
   • Kaspersky: Trojan-Spy.Win32.Zbot.edw
   • TrendMicro: TROJ_RENOS.AIG
   • F-Secure: Trojan-Spy.Win32.Zbot.edw
   • Sophos: Mal/EncPk-CZ
   • Grisoft: Agent.AADX
   • Eset: Win32/Spy.Agent.PZ trojan
   • Bitdefender: Trojan.Spy.Wsnpoem.GT

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

Side effects:
   • Downloads malicious files
   • Registry modification
   • Steals information
   • Third party control

Files It copies itself to the following location:
   • %SYSDIR%\ntos.exe

The following files are created:

– Temporary files that might be deleted afterwards:
   • %SYSDIR%\wsnpoem\audio.dll
   • %SYSDIR%\wsnpoem\video.dll

It tries to download some files:

– The location is the following:
   • http://66.199.242.115/**********l.exe
It is saved on the local hard drive under: %TEMPDIR%\5.tmp Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Drop.RKit.BJ

– The location is the following:
   • http://66.199.242.115/**********er.exe
It is saved on the local hard drive under: %TEMPDIR%\6.tmp Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Drop.Cutwail.AO

Registry The following registry key is changed:

– [HKLM\software\microsoft\windows nt\currentversion\winlogon]
   Old value:
   • userinit="%SYSDIR%\userinit.exe,"
   New value:
   • userinit="%SYSDIR%\userinit.exe,%SYSDIR%\ntos.exe,"

Backdoor The following port is opened:

– svchost.exe on a random TCP port

Contact server:
The following:
• http://blatundalqik.ru/**********rev.bin

As a result it may send information and remote control could be provided.

Injection – It injects itself into a process.

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 Thomas Wegele on Thu, 21 Aug 2008 14:50 (GMT+1)
Description updated by Thomas Wegele on Thu, 21 Aug 2008 15:08 (GMT+1)

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