W2KM_DLOADR.YYSTA

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.

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.exe

Download Routine

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

• http://{BLOCKED}allday.com/data/office

It saves the files it downloads using the following names:

• %User Temp%\{random file name}.tmp

(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.)

NOTES:

It connects the following URL to download data related to GeoIP:

https://www.{BLOCKED}d.com/en/locate-my-ip-address

The downloaded data should contain OCEANIA.

The downloaded data should not contain any of the following strings:

It does not run if the Recent Files Count is less than 3.

It does not run if the application tasks count is less than 50.

It terminates itself if any of the following processes were found running in the system: