TROJ_RESDRO.TRV

October 09, 2012
 Analysis by: Joseph Obed
 ALIASES:

Mal/ResDro-B (Sophos), Trojan-Dropper.Win32.Agent.gmrz (Kaspersky)

 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.

  TECHNICAL DETAILS

File Size:

405,504 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

21 Mar 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.

Installation

This Trojan drops the following files:

  • %System%\lib32wanu.exe
  • %System%\MySql.Data.dll

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Autostart Technique

This Trojan registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\WanuSvc
ImagePath = "%System%\lib32wanu.exe"

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}t.{BLOCKED}4.info/it.asp?intTimes=0