TROJ_CHROMEX.AD
Windows 2000, Windows XP, Windows Server 2003
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.
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.
Installation
This Trojan creates the following folders:
- %System Root%\Drivers
- %User Temp%\Crx
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
FlashPlayer = "%User Temp%\Crx\down.exe"
Other System Modifications
This Trojan modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Start Page = "http://www.{BLOCKED}u.net"
(Note: The default value data of the said registry entry is http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome.)
Dropping Routine
This Trojan drops the following files:
- %System Root%\Drivers\background.js
- %System Root%\Drivers\icon.png
- %System Root%\Drivers\script.js
- %System Root%\Drivers\jquery-1.9.1.min.js
- %System Root%\Drivers\manifest.json
- %User Temp%\Crx\down.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}medyasatis.com/eklenti/background.js
- http://{BLOCKED}medyasatis.com/eklenti/icon.png
- http://{BLOCKED}medyasatis.com/eklenti/script.js
- http://{BLOCKED}medyasatis.com/eklenti/jquery-1.9.1.min.js
- http://{BLOCKED}medyasatis.com/eklenti/manifest.json
- http://{BLOCKED}medyasatis.com/eklenti/down.exe
This report is generated via an automated analysis system.
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
Restart in Safe Mode
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\Run
- FlashPlayer = "%User Temp%\Crx\down.exe"
Step 4
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- From: Start Page = "http://www.{BLOCKED}u.net"
To: Start Page = ""http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome""
- From: Start Page = "http://www.{BLOCKED}u.net"
Step 5
Search and delete these components
- %System Root%\Drivers\background.js
- %System Root%\Drivers\icon.png
- %System Root%\Drivers\script.js
- %System Root%\Drivers\jquery-1.9.1.min.js
- %System Root%\Drivers\manifest.json
- %User Temp%\Crx\down.exe
Step 6
Search and delete these folders
- %System Root%\Drivers
- %User Temp%\Crx
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_CHROMEX.AD. 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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