Trojan.PS1.POWLOAD.TIAOENT

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.

As of this writing, the said sites are inaccessible.

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:

• %User Temp%\{8 random characters}.{3 random characters}.ps1 -> deleted afterwards
• %User Temp%\{8 random characters}.{3 random characters}.psm1 -> deleted afterwards

(Note: %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).)

It adds the following processes:

• %System%\cmd.exe {Encrypted commands} do set Bcd=!Bcd!!rl:~%X,1!&&if %X lss 4 echo !Bcd:~5! |FOR /F "delims=dZ\s tokens=10" %n IN ('ftype^^^|find "sole."')DO %n -"
• %System%\cmd.exe {Encrypted commands} do set Bcd=!Bcd!!rl:~%X,1!&&if %X lss 4 echo !Bcd:~5! |FOR /F "delims=dZ\s tokens=10" %n IN ('ftype^^^|find "sole."')DO %n -"
• %System%\cmd.exe {Encrypted commands used to connect and download executable file}
• %System%\cmd.exe /S /D /c" FOR /F "delims=dZ\s tokens=10" %n IN ('ftype^|find "sole."') DO %n -"
• %System%\cmd.exe /c ftype|find"sole."
• %System%\cmd.exe /S /D /C" ftype"
• %System%\find.exe find "sole."
• %System%\WindowsPowerShell\v1.\powershell.exe PowerShell -

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

Download Routine

This Trojan downloads the file from the following URL and renames the file when stored in the affected system:

• http://{BLOCKED}d.com/p
• http://{BLOCKED}ngsuk.com/Kv
• http://{BLOCKED}z.net/WSS
• http://{BLOCKED}h.com/kNLSCHYq
• http://{BLOCKED}oarquitetura.com.br/pqFhOq

It saves the files it downloads using the following names:

• %User Temp%\618.exe -> deleted afterwards

(Note: %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).)

As of this writing, the said sites are inaccessible.

Other Details

This Trojan does the following:

• The document contains the following message details luring users to enable macro content: