Analysis by: Kathleen Notario
ALIASES:

Gen:Variant.Graftor.256 (Fsecure), Gen:Variant.Graftor.256 (Bitdefender),

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware, Downloaded from the Internet

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 opens a hidden Internet Explorer window. It executes commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

File Size: 72,192 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 13 Mar 2012
Payload: Connects to URLs/IPs, Compromises system security, Executes files, Terminates processes, Collects system information

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.

Backdoor Routine

This backdoor opens a hidden Internet Explorer window.

It executes the following commands from a remote malicious user:

  • Terminate processes/threads
  • Execute files
  • Retrieve drive information (type, free space)

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

  • {BLOCKED}oriko.com

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.834.01
FIRST VSAPI PATTERN DATE: 13 Mar 2012
VSAPI OPR PATTERN File: 8.835.00
VSAPI OPR PATTERN Date: 14 Mar 2012

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_GRAFTOR.A. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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