Analysis by: John Rainier Navato
ALIASES:

Trojan.PowerShell.Crypt (IKARUS)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

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

This Trojan does not have any propagation routine.

It does not have any backdoor routine.

It does not have any information-stealing capability.

  TECHNICAL DETAILS

File Size: 413 bytes
File Type: PS1
Memory Resident: No
Initial Samples Received Date: 06 Dec 2024

Installation

This Trojan adds the following processes:

  • powershell -Command "Set-MpPreference -DisableRealtimeMonitoring $true"
  • powershell -Command "Set-MpPreference -MAPSReporting Disabled"
  • powershell Set-MpPreference -DisableRealtimeMonitoring $true
  • powershell Set-MpPreference -SubmitSamplesConsent 2

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Rootkit Capabilities

This Trojan does not have rootkit capabilities.

Information Theft

This Trojan does not have any information-stealing capability.

Other Details

This Trojan does the following:

  • It checks if it's running with admin rights. If not, it relaunches itself using Powershell with admin rights.
  • It disables real-time monitoring and cloud-based protection features of the Windows Defender antivirus.
  • It disables Microsoft Antimalware Protection Service (MAPS) reporting.
  • It sets the Windows Defender sample submission consent to "Never send."

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 19.766.05
FIRST VSAPI PATTERN DATE: 09 Dec 2024
VSAPI OPR PATTERN File: 19.767.00
VSAPI OPR PATTERN Date: 10 Dec 2024

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.PS1.WINDEFDISABLER.RGN. 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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