TR/Spy.ZBot.idk - Trojan

See also

Summary

Full description

Statistics

Virus:	TR/Spy.ZBot.idk
Date discovered:	18/12/2008
Type:	Trojan
Subtype:	Spy
In the wild:	Yes
Reported Infections:	Low
Distribution Potential:	Low
Damage Potential:	Medium
Static file:	No
IVDF version:	7.01.00.251 - Thu, 18 Dec 2008 08:11 (GMT+1)

General Methods of propagation:
   • Email

Aliases:
   • Kaspersky: Trojan-Spy.Win32.Zbot.idk
   • F-Secure: Trojan-Spy:W32/Zbot.AAR
   • Sophos: Mal/EncPk-CZ
   • Eset: Win32/Spy.Zbot.CU trojan

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

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

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

It tries to download a file:

– The location is the following:
• http://sosfichier.com/**********er.exe
It is saved on the local hard drive under: %TEMPDIR%\4.tmp Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Dropper.Gen

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%\twext.exe,"

Backdoor The following port is opened:

– svchost.exe on a random TCP port

Contact server:
The following:
• http://elenahysd.ru/**********/conf.bin

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

File details Programming language:
The malware program was written in MS Visual C++.

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, 18 Dec 2008 12:41 (GMT+1)
Description updated by Thomas Wegele on Thu, 18 Dec 2008 12:57 (GMT+1)

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