TROJ_DLOADER.YMNIC

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 accesses websites to download files. This action allows this malware to possibly add other malware on the affected computer. 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 on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Download Routine

This Trojan accesses websites to download the following files:

• http://www.{BLOCKED}x{random 4 characters}.com/Public/softs/lim5/9286/all/qks.exe (75.126.4.203)

It saves the files it downloads using the following names:

• %User Temp%\{random folder}.tmp\dlzipdata - 7zip archive data

(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.

NOTES:

The archive file downloaded may possibly contain malware or adware depending on the update from the server.

The archive file is extracted and executed, as a result, malicious or suspicious routines are exhibited on the affected system.