VBS_ALIHAK.VN

January 26, 2015
 Analysis by: Anthony Joe Melgarejo
 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes


  TECHNICAL DETAILS

File Size:

913 bytes

File Type:

ASP, VBS

Memory Resident:

No

Initial Samples Received Date:

11 Dec 2014

NOTES:

This malware arrives by taking advantage of certain vulnerabilities on software found in web servers which allows download of this Trojan.

It attempts to do the following:

  • Executes cmd.exe /c whoami and sends the command's output (domain and user name) as the server response
  • Drops temp.tmp in the current folder then sends write as the server response, if successful
  • If the file dropping routine is successful, it deletes the dropped file then sends delete as the server response upon success

As a result, the hacker gets the domain and user name of the victim (web server) and determine if (s)he has write and delete access in the current folder.

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

11.346.06

FIRST VSAPI PATTERN DATE:

12 Nov 2014

VSAPI OPR PATTERN File:

11.347.00

VSAPI OPR PATTERN Date:

13 Nov 2014

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Scan your computer with your Trend Micro product and note files detected as VBS_ALIHAK.VN

Step 4

Search and delete these files

[ Learn More ]
There may be some files that are 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.
  • {malware path}\temp.tmp

Step 5

Scan your computer with your Trend Micro product to delete files detected as VBS_ALIHAK.VN. 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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