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WORM_CONFUSER.A

March 14, 2013
 Analysis by: Anthony Joe Melgarejo
 ALIASES:

RDN/Generic.hra!j (McAfee), Troj/Agent-AANA (Sophos), W32/Injector_Autoit.GI (Fortinet), Trojan.Win32.Scarsi (Ikarus), Win32/Injector.Autoit.GI 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: Worm

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Propagates via removable drives, Propagates via social networking sites, Spammed via email

This worm arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives via removable drives. It may arrive on a system by clicking spammed malicious links on the social networking site Facebook.

It contains errors in its code. This stops it from performing its routines.

  TECHNICAL DETAILS

File Size:

978,653 bytes

File Type:

EXE

File Compression:

AutoIt

Memory Resident:

Yes

Initial Samples Received Date:

09 Mar 2013

Arrival Details

This worm arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It arrives via removable drives.

It may arrive on a system by clicking spammed malicious links on the social networking site Facebook.

Installation

This worm injects codes into the following process(es):

  • mshta.exe

Other Details

This worm checks for the presence of the following process(es):

  • egui.exe

It contains errors in its code. This stops it from performing its routines.

NOTES:

It attemps to create an autorun registry to ensure its automatic execution every system startup to the following key:

HKEY_CURRENT_USER\Microsoft\Windows\CurrentVersion\Run

It intends to propagate through the following:

  • removable drives
  • local networks
  • Facebook messages

It attempts to disable AV software.

It checks if it is running under the following BIOS versions and Virtualization Software or Sandbox:

BIOS versions:

  • AMI - 8000314
  • AMI - 9000816
  • AMI - 6000901
  • AMI - 2000622
  • AL - 1000831

Virtualization Software:

  • Virtual Machine
  • Virtual PC 2007
  • Virual Server 2005 R2
  • Virual Server 2005 R2 SP1
  • Windows Virtual PC

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.776.02

FIRST VSAPI PATTERN DATE:

09 Mar 2013

VSAPI OPR PATTERN File:

9.777.00

VSAPI OPR PATTERN Date:

09 Mar 2013

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

Scan your computer with your Trend Micro product and note files detected as WORM_CONFUSER.A

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete files detected as WORM_CONFUSER.A

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_CONFUSER.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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