arrow_back
search
close

Trojan.Win32.ACLL.0NA103CE24

April 22, 2024
 Analysis by: Raymart Christian Yambot
 ALIASES:

LNK/YAV.Minerva.5fa3d1 (ANTIVIR)

 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:

347,220 bytes

Memory Resident:

No

Initial Samples Received Date:

20 Mar 2024

Payload:

Drops files, Modifies system registry

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 drops the following files:

  • %Application Data%\Microsoft\Windows\Recent\CustomDestinations\{Random Characters}.temp
  • %User Temp%\{8 Random Characters}.pdh.ps1 - Deleted Afterwards
  • %User Temp%\{8 Random Characters}.snn.psm1 - Deleted Afterwards
  • %User Temp%\{8 Random Characters}.2tr.ps1 - Deleted Afterwards
  • %User Temp%\{8 Random Characters}.bmj.psm1 - Deleted Afterwards
  • %AppDataLocal%\Microsoft\Windows\PowerShell\StartupProfileData-Interactive
  • %AppDataLocal%\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following processes:

  • "C%System%\WindowsPowerShell\v1.0\powershell.exe" if (!(Test-Path fakes_war_time.pdf.lnk)) { if ((gci $env:tmp -Name Rar* | Select-Object -First 1) -ne $null) {cd $env:tmp/$(gci $env:tmp -Name Rar* | Select-Object -First 1)} else {cd $env:tmp/$(gci $env:tmp -Name *.zip.* | Select-Object -First 1)} } gc fakes_war_time.pdf.lnk -Tail "1" | powershell

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Other System Modifications

This Trojan modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
ZoneMap
UNCAsIntranet = 0

(Note: The default value data of the said registry entry is 1.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
ZoneMap
AutoDetect = 1

(Note: The default value data of the said registry entry is 0.)

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

19.228.03

FIRST VSAPI PATTERN DATE:

20 Mar 2024

VSAPI OPR PATTERN File:

19.229.00

VSAPI OPR PATTERN Date:

21 Mar 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

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

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap
    • UNCAsIntranet = 0
    • UNCAsIntranet = 0 (Original Value)
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap
    • AutoDetect = 1
    • AutoDetect = 1 (Original Value)

Step 4

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.
  • %Application Data%\Microsoft\Windows\Recent\CustomDestinations\{Random Characters}.temp
  • %User Temp%\{8 Random Characters}.pdh.ps1
  • %User Temp%\{8 Random Characters}.snn.psm1
  • %User Temp%\{8 Random Characters}.2tr.ps1
  • %User Temp%\{8 Random Characters}.bmj.psm1
  • %AppDataLocal%\Microsoft\Windows\PowerShell\StartupProfileData-Interactive
  • %AppDataLocal%\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Step 5

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.ACLL.0NA103CE24. 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:


Did this description help? Tell us how we did.