TROJ_ROWLIM.A
Win32/Emotet.AG (ESET-NOD32)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
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.
TECHNICAL DETAILS
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.
SOLUTION
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Search and delete this file
- %User Temp%\mailsend{random characters}
- %User Temp%\{random filename}.tmp
Step 3
Scan your computer with your Trend Micro product to delete files detected as TROJ_ROWLIM.A. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
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