Analysis by: Christopher Daniel So
ALIASES:

JV/BackDoor-FAZY!B4754A941035 (McAfee), HEUR:Backdoor.Java.Generic (Kaspersky), Java/JacskBot.GX (AntiVir), Java/Jacksbot.H!tr (Fortinet), Java.JacskBot (Ikarus)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • 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: 231,216 bytes
File Type: JAR
Initial Samples Received Date: 08 Jan 2014

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:

  • %User Temp%\hsperfdata_{user name}\332

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

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
JavaUp = ""%Program Files%\Java\{Java runtime version}\bin\javaw.exe" -jar "{malware path and file name}""

Other Details

This Trojan connects to the following possibly malicious URL:

  • microsoftjava.{BLOCKED}tme.net:1338