BKDR_ANDROM.TF

 Analysis by: Jed Valderama

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • 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:

60,416 bytes

File Type:

EXE

Initial Samples Received Date:

03 Sep 2012

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:

  • {All User's Profile}\Local Settings\Temp\ms{random characters}.{extension name}
  • {All User's Profile}\svchost.exe

It injects codes into the following process(es):

  • wuauclt.exe

Autostart Technique

This backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
SunJavaUpdateSched = "{All User's Profile}\svchost.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
{random number} = "{All User's Profile}\Local Settings\Temp\ms{random characters}.{extension name}"

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://{BLOCKED}d.pl/image.php
  • http://{BLOCKED}a.pl/image.php
  • http://{BLOCKED}e.pl/image.php
  • http://{BLOCKED}m.ru/image.php
  • http://{BLOCKED}ge.com/image.php

NOTES:
Where {extension name} is any of the following:

  • BAT
  • CMD
  • COM
  • EXE
  • PIF
  • SCR