Trojan.VBS.NEGASTEAL.Y

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 adds the following processes:

• powershell {Obfuscated Powershell Script}
• %Windows%\syswow64\WindowsPowerShell\v1.0\powershell.exe {Obfuscated Powershell Script} → If executed in a 64-bit environment

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

Download Routine

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

• http://{BLOCKED}nmichaelsmith.com/ds1/Posernes.pfb

It saves the files it downloads using the following names:

• %Application Data%\Revi242.Enr

(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).)

As of this writing, the said sites are inaccessible.

Other Details

This Trojan does the following:

• It decodes the downloaded file "%Application Data%\Revi242.Enr" and executes its contents using Powershell.

(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).)