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BKDR_FARFLI.ALX

July 12, 2013
 Analysis by: Jennifer Gumban
 ALIASES:

Backdoor:Win32/Farfli.K (Microsoft), Backdoor.Win32.Farfli (Ikarus), W32/Magania.GHAM!tr (Fortinet)

 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. It arrives as a component bundled with malware/grayware packages.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

20,480 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

08 Jul 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.

It arrives as a component bundled with malware/grayware packages.

Installation

This backdoor drops the following file(s)/component(s):

  • %System%\Iprlp.dll
  • %System%\kb{Random Numbers}.dat

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

Other System Modifications

This backdoor adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\{Current Control Set}\
Services\6to4
Description = "automatically update the device driver"

HKEY_LOCAL_MACHINE\SYSTEM\{Current Control Set}\
Services\6to4\Parameters
ServiceDll = "%System%\Iprlp.dll"

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://binary.{BLOCKED}-onlines.org
  • http://oac.{BLOCKED}2.org

It deletes itself after execution.