JS_NEMUCOD.ELDSAOL
TrojanDownloader:JS/Swabfex.P (Microsoft); JS/Nemucod.mt (McAfee); JS/TrojanDownloader.Nemucod.AVG (ESET-NOD32)
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Spammed via email
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
It does not have any propagation routine.
It does not have any backdoor routine.
TECHNICAL DETAILS
30,231 bytes
JS, Other
No
06 Sep 2016
Arrival Details
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
Propagation
This Trojan does not have any propagation routine.
Backdoor Routine
This Trojan does not have any backdoor routine.
Download Routine
This Trojan connects to the following website(s) to download and execute a malicious file:
- http://www.{BLOCKED}s.{BLOCKED}t.ru/87b3ff3rc?ClKmkSII=GLdeUD -> Inaccessible
- http://www.{BLOCKED}naomc.com/87b3ff3rc?ClKmkSII=GLdeUD - > Inaccessible
- http://{BLOCKED}c.{BLOCKED}daancha.net/87b3ff3rc?ClKmkSII=GLdeUD -> Accessible
- http://{BLOCKED}ppppsr.biz/js/87b3ff3rc?ClKmkSII=GLdeUD -> Inaccessible
It saves the files it downloads using the following names:
- %User Temp%\ttqqcenUID1 ->temporary storage for encrypted downloaded file
- %User Temp%\ttqqcenUID2 -> temporary storage for encrypted downloaded file
- %User Temp%\ttqqcenUID3 -> temporary storage for encrypted downloaded file
- %User Temp%\ttqqcenUID4 -> temporary storage for encrypted downloaded file
- %User Temp%\ttqqcenUID1.dll -> decrypted file
- %User Temp%\ttqqcenUID2.dll -> decrypted file
- %User Temp%\ttqqcenUID3.dll -> decrypted file
- %User Temp%\ttqqcenUID4.dll -> decrypted 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.)
Other Details
This Trojan does the following:
- It executes the downloaded files using the following commands: "%System%\rundll32.exe" "%User Temp%\{filename}",qwerty
where {filename} could be one of the following:- ttqqcenUID1.dll
- ttqqcenUID2.dll
- ttqqcenUID3.dll
- ttqqcenUID4.dll
(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:
It does not have rootkit capabilities.
It does not exploit any vulnerability.
SOLUTION
9.800
12.760.03
06 Sep 2016
12.761.00
07 Sep 2016
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%\ttqqcenUID1
- %User Temp%\ttqqcenUID2
- %User Temp%\ttqqcenUID3
- %User Temp%\ttqqcenUID4
- %User Temp%\ttqqcenUID1.dll
- %User Temp%\ttqqcenUID2.dll
- %User Temp%\ttqqcenUID3.dll
- %User Temp%\ttqqcenUID4.dll
Step 4
Scan your computer with your Trend Micro product to delete files detected as JS_NEMUCOD.ELDSAOL. 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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