TROJ_WERDLOD.U
TrojanDownloader:Win32/Tonnejoom.A (Microsoft); Troj/Limitai-BG (Sophos);
Windows
![](/vinfo/imgFiles/legend.jpg)
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
143,947 bytes
EXE
No
25 Aug 2015
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 modifies the following file(s):
- {firefox path}\prefs.js
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
AutoConfigURL = "https://puretonnel.net/3desonnel.js"
Dropping Routine
This Trojan drops the following files:
- %All Users Profile%\cert{value}.der
(Note: %All Users Profile% is the All Users folder, where it usually is C:\Documents and Settings\All Users on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData 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 saves the files it downloads using the following names:
- %All Users Profile%\Microsoft-KB{random}.exe
or - %All Users Profile%\WindowsXP-KB{random}.exe
(Note: %All Users Profile% is the All Users folder, where it usually is C:\Documents and Settings\All Users on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData 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 connects to the following possibly malicious URL:
- http://www.{BLOCKED}unter.com/counter.php?vtrtvrvtrtvertvr
- http://www.{BLOCKED}unter.com/counter.php?tcrcrcerererwbvbbrtdf
- http://www.{BLOCKED}zerhof-wetzikon.ch/images/rtucrtmirumctrutbitueriumxe/ivotyimoyctorieotcmir.exe
However, as of this writing, the said sites are inaccessible.
SOLUTION
9.750
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 value
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\Microsoft\Windows\CurrentVersion\Internet Settings
- AutoConfigURL = "https://puretonnel.net/3desonnel.js"
- AutoConfigURL = "https://puretonnel.net/3desonnel.js"
Step 4
Search and delete these files
- %All Users Profile%\Microsoft-KB{random}.exe
- %All Users Profile%\WindowsXP-KB{random}.exe
- %All Users Profile%\cert{value}.der
Step 5
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- {firefox path}\prefs.js
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_WERDLOD.U. 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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