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Trojan.PS1.POWERSPLOIT.G

March 17, 2023
 Analysis by: Carlos Villegas Madrid
 ALIASES:

Trojan:PowerShell/Powersploit.J (MICROSOFT)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


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:

317,061 bytes

File Type:

PS1

Memory Resident:

No

Initial Samples Received Date:

23 Feb 2023

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.

Other Details

This Trojan does the following:

  • Capable of the following:
    • Loading of the following into memory of the targeted process reflectively
      • Binary/Executable payloads
      • DLL
      • Script
      • Shellcode
    • Loading of a DLL into memory of a remote process reflectively
  • Uses the following arguments:
    • PEBytes → array of bytes containing {Base64 Encoded Payload} Detected as → Backdoor.Win32.TRAMSCAT.A.
    • ComputerName → array of strings representing the names of remote computers where to inject the payload. If this parameter is null, the payload will be injected into the local machine.
    • FuncReturnType → return type of the function being called in the DLL.
      • Could be any of the following:
        • WString
        • String
        • Void
    • Exeargs → Optional, arguments to pass to the executable being reflectively loaded.
    • ProcName → string that represents the name of the remote process to inject the DLL into.
    • ProcId → string that represents the process ID of the remote process to inject the DLL into.
    • ForceaSLR → will force the use of ASLR on the PE being loaded even if the PE indicates it doesn't support ASLR.
    • DoNotZeroMZ → if set to true, it zeroes out the MZ signature on PE files.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.276.10

FIRST VSAPI PATTERN DATE:

25 Feb 2023

VSAPI OPR PATTERN File:

18.277.00

VSAPI OPR PATTERN Date:

26 Feb 2023

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

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

Identify and terminate files detected as Trojan.PS1.POWERSPLOIT.G

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

Scan your computer with your Trend Micro product to delete files detected as Trojan.PS1.POWERSPLOIT.G. 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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