TROJ_KULUOZ.YY

November 22, 2013
 Analysis by: Alvin Bacani
 ALIASES:

TrojanDownloader:Win32/Kuluoz.D (Microsoft); Trojan-Downloader.Win32.Dofoil.rdq (Kaspersky)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

148,480 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

02 Nov 2013

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 copies of itself into the affected system and executes them:

  • %AppDataLocal%\{random filename}.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 leaves the following text files:

  • {Malware Path and Filename}.txt

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}.{BLOCKED}.79.44:8080
  • http://{BLOCKED}.{BLOCKED}.55.130:8080
  • http://{BLOCKED}.{BLOCKED}.144.158:8080
  • http://{BLOCKED}.{BLOCKED}.211.23:8080
  • http://{BLOCKED}.{BLOCKED}.191.157:8080
  • http://{BLOCKED}.{BLOCKED}.44.180:8080
  • http://{BLOCKED}.{BLOCKED}.1.118:8080

It deletes itself after execution.