ACM_KENILFE.SMA

October 09, 2012
 Analysis by: Jed Valderama
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It modifies files, disabling programs and applications from properly running.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

27,483 bytes

File Type:

Other

Memory Resident:

Yes

Initial Samples Received Date:

14 Sep 2012

Arrival Details

This Trojan 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 Trojan drops the following copies of itself into the affected system:

  • {Autocad installation folder}\acad.fas
  • {Autocad fonts folder}\txtautoz.shx
  • {all folders and subfolders from drives C: to Z: which contains .dwg files}\acad.fas

It creates the following folders:

  • C:\Bakdirectory

Other System Modifications

This Trojan modifies the following files:

  • acad.mnl

Download Routine

This Trojan accesses the following websites to download files:

  • http://{BLOCKED}y.2288.org/ysy.tmp
  • http://www.{BLOCKED}s.com/hqzxcj/wdzxcj.dat

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

However, as of this writing, the said sites are inaccessible.

NOTES:
Kindly add the following:

This malware stores configuration information in the following registry location:

HKEY_CURRENT_USER\Software\fileken\settings

HKEY_CURRENT_USER\Software\KenFiles\settings

It sends a PING command to the following sites:

  • 116.236.100.100
  • rmytwsjxx.2288.org

It checks if the following files are present on the system and if found deletes them:

  • arxfucker.dll
  • acad.sys
  • acadsmu.fas
  • acadapq.lsp
  • acadappp.lsp
  • acadapp.lsp
  • dwgrun.bat
  • winfas.ini
  • acadiso.lsp
  • acad.fas
  • isomianyi.shx
  • acad.fas1
  • lcm.fas
  • isohztxt.shx

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.392.05

FIRST VSAPI PATTERN DATE:

13 Sep 2012

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Scan your computer with your Trend Micro product and note files detected as ACM_KENILFE.SMA

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry key

[ Learn More ]

=Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator’s help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\KenFiles
    • Settings
  • In HKEY_CURRENT_USER\Software\fileken
    • settings

Step 5

Search and delete the file detected as ACM_KENILFE.SMA

*Note: Some component files may be hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.

To manually delete a malware/grayware file from the affected system:

  1. Right-click Start then click Search....
  2. In the Named input box, type the name of the file that was detected earlier.
  3. In the Look In drop-down list, select My Computer then press Enter.
  4. Once located, select the file then press SHIFT+DELETE to delete it.

Step 6

Search and delete this folder

[ 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.
  • C:\Bakdirectory

Step 7

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


Did this description help? Tell us how we did.