Analysis by: Alvin John Nieto
ALIASES:

Trojan.Fakeavlock (Symantec), Trojan.Win32.Kuluoz.be (v) (Sunbelt), Troj/Agent-AFUQ (Sophos)

 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: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This backdoor 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: 229,376 bytes
File Type: EXE
Initial Samples Received Date: 31 Jan 2014

Arrival Details

This backdoor 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 backdoor drops the following copies of itself into the affected system:

  • %AppDataLocal%\{random}.exe

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

It adds the following processes:

  • svchost.exe

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://{BLOCKED}.{BLOCKED}.88.42:8080/{value}
  • http://{BLOCKED}.{BLOCKED}.112.12:8080/{value}
  • http://{BLOCKED}.{BLOCKED}.212.45:8080/{value}
  • http://{BLOCKED}.{BLOCKED}.143.211:8080/{value}
  • http://{BLOCKED}.{BLOCKED}.6.217:8080/{value}