BKDR_THOPER.AYW

November 11, 2014
 Analysis by: Rika Joi Gregorio
 ALIASES:

Backdoor:Win32/Thoper.F(Microsoft), LooksLike.Win32.Uruasy.b!ag (v)(Sunbelt), a variant of Win32/Korplug.J trojan(Eset)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This backdoor may be dropped by other malware.

  TECHNICAL DETAILS

File Size:

315,392 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

05 Nov 2014

Arrival Details

This backdoor may be dropped by other malware.

Installation

This backdoor drops the following files:

  • %All Users Profile%\Application Data\SS.LOG

(Note: %All Users Profile% is the All Users folder, where it usually is C:\Documents and Settings\All Users on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData 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.)

Other System Modifications

This backdoor adds the following registry keys:

HKEY_CLASSES_ROOT\SS

HKEY_CLASSES_ROOT\SS\PROXY

Other Details

This backdoor connects to the following possibly malicious URL:

  • {BLOCKED}.{BLOCKED}.40.100:139/update?id={random}