TROJ_OBFUSC.TRR

October 09, 2012
 Analysis by: Nikko Tamana
 ALIASES:

Win32.SuspectCrc (Ikarus), VirTool:Win32/Obfuscator.ABD (Microsoft), Gen:Variant.Zusy.4398 (Bitdefender)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It may be dropped by other malware.

It connects to certain URLs. It may do this to remotely inform a malicious user of its installation. It may also do this to download possibly malicious files onto the computer, which puts the computer at a greater risk of infection by other threats.

  TECHNICAL DETAILS

File Size:

29,696 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

10 Sep 2012

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It may be dropped by the following malware:

  • TROJ_ARTIEF.TRR

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
WINSVR = "{Malware Path and File name}"

Download Routine

This Trojan connects to the following malicious URLs:

  • {BLOCKED}.{BLOCKED}.241.144
  • {BLOCKED}.{BLOCKED}.204.207
  • qq.{BLOCKED}rbe.org