VBS_SHELLEXE.AG

This backdoor arrives via removable drives. 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 drops copies of itself in all removable drives.

It runs certain commands that it receives remotely from a malicious user. Doing this puts the affected computer and information found on the computer at greater risk.

Arrival Details

This backdoor arrives via removable drives.

It 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 backdoor drops the following copies of itself into the affected system:

• %User Temp%\{malware filename}.vbs

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp 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.)

Propagation

This backdoor drops copies of itself in all removable drives.

Backdoor Routine

This backdoor executes the following command(s) from a remote malicious user:

• execute ← Execute File
• update ← Update self
• uninstall ← Uninstall self
• download ← Download File
• upload ← Upload File
• enum-driver ← not used
• enum-faf ← not used
• enum-process ← Enumerate process
• cmd-shell ← Command shell
• exit-process ← Exit process
• sleep ← Sleep malware
• delete ← Delete File or Folder

It connects to the following URL(s) to send and receive commands from a remote malicious user:

• http://{BLOCKED}her.no-ip.org:19002