JS_NEMUCOD.SMK11

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

It 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 saves the files it downloads using the following names:

• %User Temp%\gAHcicy1
• %User Temp%\gAHcicy2
• %User Temp%\gAHcicy3
• %User Temp%\gAHcicy4
• %User Temp%\gAHcicy5
• %User Temp%\gAHcicy1.dll
• %User Temp%\gAHcicy2.dll
• %User Temp%\gAHcicy3.dll
• %User Temp%\gAHcicy4.dll
• %User Temp%\gAHcicy5.dll

(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.

Other Details

This Trojan connects to the following possibly malicious URL:

• http://{BLOCKED}mage.comuf.com/076wc?skErjw=yLIdykHTf
• http://{BLOCKED}ul.ae/076wc?skErjw=yLIdykHTf
• http://{BLOCKED}ah.com/076wc?skErjw=yLIdykHTf
• http://{BLOCKED}gy.net/076wc?skErjw=yLIdykHTf
• http://www.{BLOCKED}ecohut.com/076wc?skErjw=yLIdykHTf