TROJ_ROWLIM.A

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 may be downloaded from remote sites by other malware.

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.

It may be downloaded from remote site(s) by the following malware:

• TROJ_EMOTET variants

Installation

This Trojan drops the following files:

• %User Temp%\mailsend{random characters}

(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.)

Download Routine

This Trojan connects to the following URL(s) to download its component file(s):

• {BLOCKED}.{BLOCKED}.160.145/{random characters 1}/{random characters}
• {BLOCKED}.{BLOCKED}.209.149:8080/{random characters 1}/{random characters}
• {BLOCKED}.{BLOCKED}.214.106:443/{random characters 1}/{random characters}

It saves the files it downloads using the following names:

• %User Temp%\{random filename}.tmp - {spam pdf or html file}

(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.)

NOTES:

This Trojan can send spam email that contain .PDF files, which contain a link that leads to the download of a .ZIP file. The .ZIP file contains a malware belonging to TROJ_EMOTET.

It can also send spam email that contain a malicious link. The link leads to the download of a .ZIP file. The .ZIP file contains a malware belonging to TROJ_EMOTET.

The languages it uses are German and Polish.

It downloads its list of Simple Mail Transfer Protocol (SMTP) servers and the credentials to use from its C&C server.