Analysis by: John Rainier Navato
ALIASES:

Trojan.VBS.GuLoader (IKARUS)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  TECHNICAL DETAILS

File Size: 27,322 bytes
File Type: VBS
Initial Samples Received Date: 27 May 2024
Payload: Connects to URLs/IPs

Installation

This Trojan adds the following processes:

  • powershell.exe "gal;gal;gal;gal;gal;gal;gal;gal;gal;Function Unsuspecting ($Tretrins){$Compassive = $Tretrins.Length-1; {Continuation of Malicious Code}"

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}ndowsupdate.com/msdownload/update/v3/static/trustedr/en/disallowedcertstl.cab?79cea6cafe75c3dd
  • http://{BLOCKED}ndowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootstl.cab?2d0e21ba77d1c73a
  • http://{BLOCKED}ndowsupdate.com/msdownload/update/v3/static/trustedr/en/3679CA35668772304D30A5FB873B0FA77BB70D54.crt?a492e72185a034c3
  • http://{BLOCKED}ndowsupdate.com/msdownload/update/v3/static/trustedr/en/disallowedcertstl.cab?9beb002ac978bc62
  • https://{BLOCKED}ctian1.com

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 19.964.08
FIRST VSAPI PATTERN DATE: 17 Mar 2025
VSAPI OPR PATTERN File: 19.965.00
VSAPI OPR PATTERN Date: 18 Mar 2025

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Scan your computer with your Trend Micro product to delete files detected as Trojan.VBS.POWRUN.B. 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 the following Trend Micro Support pages for more information:


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