Trojan.PS1.CRONUS.THHAEBD

August 23, 2024
 Analysis by: John Rainier Navato
 ALIASES:

Trojan:PowerShell/Malgent!MSR (MICROSOFT)

 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

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.

  TECHNICAL DETAILS

File Size:

852,258 bytes

File Type:

PS1

Memory Resident:

No

Initial Samples Received Date:

15 Aug 2024

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 adds the following processes:

  • %Windows%\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

It injects codes into the following process(es):

  • Spawned %Windows%\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

Other Details

This Trojan does the following:

  • It uses reflective DLL loading to proceed with its main routine.
  • It reflectively loads a dll that will inject Ransom.MSIL.CRONUS.THHOIBD to %Windows%\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

19.530.03

FIRST VSAPI PATTERN DATE:

15 Aug 2024

VSAPI OPR PATTERN File:

19.531.00

VSAPI OPR PATTERN Date:

16 Aug 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.CRONUS.THHAEBD. 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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