Analysis by: Cris Nowell Pantanilla
ALIASES:

Trojan:Win32/Gatak.DU!dha (Microsoft), WS.Reputation.1 (Symantec)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • 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: 581,632 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 15 Apr 2015

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%\~{random digits}.tmp - contains system information

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It injects threads into the following normal process(es):

  • explorer.exe

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}enpost.org/uploads/a5ceff2fbe1dd4e1e4c45c559f2c27be.png
  • http://www.{BLOCKED}up.net/?di=1414238345813
  • http://{BLOCKED}.{BLOCKED}.166.33/report_N_0018_{report details}