JS_NEMUCOD.THEADAH
JS/Psyme (AVG), JS/TrojanDownloader.Agent.RXY trojan (NOD32)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted:
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.
However, as of this writing, the said sites are inaccessible.
TECHNICAL DETAILS
16,666 bytes
JS
No
14 May 2018
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.
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\Classes\
mscfile
HKEY_CURRENT_USER\Software\Classes\
mscfile\shell
HKEY_CURRENT_USER\Software\Classes\
mscfile\shell\open
HKEY_CURRENT_USER\Software\Classes\
mscfile\shell\open\
command
It also creates the following registry entry(ies) as part of its installation routine:
HKEY_CURRENT_USER\Software\Classes\
mscfile\shell\open\
command
(Default) = "%System%\wscript.exe" "%User Temp%\{file_name}}.js" {parameter}
Other Details
This Trojan connects to the following possibly malicious URL:
- http://www.{BLOCKED}jwfoby39v7o7b.{BLOCKED}/update.php
- http://www.{BLOCKED}lligsteforbruksln-ixb.{BLOCKED}/update.php
However, as of this writing, the said sites are inaccessible.
SOLUTION
9.850
14.250.06
14 May 2018
14.251.00
15 May 2018
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
Delete this registry key
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Classes
- mscfile
- mscfile
Step 4
Scan your computer with your Trend Micro product to delete files detected as JS_NEMUCOD.THEADAH. 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 the following Trend Micro Support pages for more information:
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