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BKDR_KELIHOS.AML

January 31, 2014
 Analysis by: Ardin Christopher Maglalang
 ALIASES:

Backdoor.Win32.Hlux.beol(Kaspersky), Backdoor:Win32/Kelihos.F(Microsoft), Win32/Kryptik.BQAU(ESET), Trojan.ADH(Norton)

 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:
 INFORMATION EXPOSURE:

  • 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:

916,480 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

31 Jan 2014

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 non-malicious files:

  • %System%\packet.dll
  • %System%\WinPcap
  • %System%\drivers\NPF.sys

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

Autostart Technique

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

KEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
NetworkChecker = "{Malware Path and Filename}"

Backdoor Routine

This backdoor connects to the following URL(s) to send and receive commands from a remote malicious user:

  • http://{BLOCKED}.{BLOCKED}.250.118
  • http://{BLOCKED}.{BLOCKED}.64.130
  • http://{BLOCKED}.{BLOCKED}.26.164