JS_DLOADE.XXPU

This malware is involved in the Cryptowall 3.0 attacks detected on March 2015. It comes as a malicious attachment to socially-engineered spam. Once extracted, it downloads Cryptowall strains onto the affected system and executes them.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

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

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

Download Routine

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

• http://{BLOCKED}okolrt.com/images/one.jpg
• http://{BLOCKED}okolrt.com/images/two.jpg
• http://{BLOCKED}okolrt.com/images/two.jpg

It saves the files it downloads using the following names:

• %User Temp%\542824559.exe
• %User Temp%\589878543.exe

(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.)

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