Analysis by: Anthony Joe Melgarejo
ALIASES:

W32/Dorkbot.SUP!tr (Fortinet), Win32/Injector.AFGE trojan (ESET)

 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:

  • 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: 531,516 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 17 Apr 2013

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.

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
Windongs = "{malware path and file name}"

Other Details

This backdoor connects to the following possibly malicious URL:

  • {BLOCKED}n.{BLOCKED}s.cat

NOTES:

This backdoor connects to the following sites to perform a speed test:

  • http://speedtest1.{BLOCKED}city.net/speedtest/upload.php?x={random value}
  • http://{BLOCKED}.{BLOCKED}.12.242/speedtest/upload.php?x={random number}
  • http://{BLOCKED}h-electronics.comuf.com/speedtest/upload.php?x={random number}