Analysis by: Thea Patrice Tajonera
ALIASES:

Trojan-Dropper.PowerShell.Compressed.c (KAPERSKY); TrojanDropper:PowerShell/Injector.GS!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

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

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. It may be downloaded from remote sites by other malware.

It is used to load and execute a file.

  TECHNICAL DETAILS

File Size: 1,015,312 bytes
Memory Resident: No
Initial Samples Received Date: 25 Feb 2020
Payload: Executes files

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.

It may be downloaded from remote site(s) by the following malware:

  • TrojanSpy.PS1.LEMONDUCK.C

Other Details

This Trojan is used to load and execute the following file:

  • {Malware Path}\{Random Character}.gz
  • {Malware Path}\{Random Character}.exe -> detected as Coinminer.Win64.MALXMR.SMCGR26

It does the following:

  • Injects Shellcode Into A Process
  • Capable of the following:
    • Loading of a DLL or EXE in to memory of a remote process reflectively
    • Destroy MZ Header of PE File to avoid detection

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 15.936.02
FIRST VSAPI PATTERN DATE: 17 Jun 2020
VSAPI OPR PATTERN File: 15.937.00
VSAPI OPR PATTERN Date: 18 Jun 2020

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

Search and delete this file

[ 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}\{Random Characters}.gz
  • {Malware Path}\{Random Characters}.exe

Step 4

Scan your computer with your Trend Micro product to delete files detected as Trojan.PS1.LEMONDUCK.YPAB-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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