TROJ_UPATRE.VNA

This malware is involved in the CryptoLocker ransomware malicious spam campaign spotted on October 2013. It is the malicious attachment that, when executed, downloads more malware onto the affected system. Users affected by this malware may find certain files and/or documents in their system unusable.

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

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.

It modifies the Internet Explorer Zone Settings.

It deletes itself after execution.

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.

Web Browser Home Page and Search Page Modification

This Trojan modifies the Internet Explorer Zone Settings.

Download Routine

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

• http://{BLOCKED}e.com/images/bl.exe via port 443

It saves the files it downloads using the following names:

• %User Temp%\hfdfjdk.exe - also detected as TSPY_ZBOT.VNA

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Other Details

This Trojan deletes itself after execution.