TROJ_SCAR.ABG
TrojanDownloader:Win32/Spycos.K (Microsoft); PWS-Banker.dldr!h (McAfee); Downloader (Symantec); Trojan.Win32.Scar.fdsc (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); DeepScan:Generic.Malware.P!BVPk!.7D814087 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
![](/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.
TECHNICAL DETAILS
158,208 bytes
EXE
Yes
30 Aug 2012
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 drops the following copies of itself into the affected system:
- %User Temp%\231120111142.exe
(Note: %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.)
It creates the following folders:
- %System Root%\Mcrosoft
- %System Root%\Mcrosoft\SysComerc
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
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
File = "%User Temp%\231120111142.exe"
It registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{3CA2F312-6F6E-4B53-A66E-4E65E497C8C0}
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{A3BC75A2-1F87-4686-AA43-5347D756017C}
Other System Modifications
This Trojan deletes the following files:
- %Program Files%\avg\avg9\avgwdsvc.exe
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)
It adds the following registry keys:
HKEY_CLASSES_ROOT\CLSID\{CCC7A320-B3CA-4199-B1A6-9F516DD69829}
HKEY_CLASSES_ROOT\CLSID\{CCC7A320-B3CA-4199-B1A6-9F516DD69829}\
InprocServer32
HKEY_CURRENT_USER\HKEY_CURRENT_USER
It adds the following registry entries:
HKEY_CURRENT_USER\HKEY_LOCAL_MACHINE\SOFTWARE\
Microsoft\Windows\CurrentVersion\
Policies\System
EnableLUA = "{malware path and file name}"
HKEY_CURRENT_USER\HKEY_LOCAL_MACHINE\SOFTWARE\
Microsoft\Windows\CurrentVersion\
Policies\System
EnableLUA = "%User Temp%\231120111142.exe"
Dropping Routine
This Trojan drops the following files:
- %User Temp%\_thunbs2.db
- %User Temp%\231120111142.exe
(Note: %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.)
This report is generated via an automated analysis system.
SOLUTION
9.200
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Restart in Safe Mode
Step 3
Close all opened browser windows
Step 4
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_CLASSES_ROOT\CLSID
- {CCC7A320-B3CA-4199-B1A6-9F516DD69829}
- In HKEY_CLASSES_ROOT\CLSID\{CCC7A320-B3CA-4199-B1A6-9F516DD69829}
- InprocServer32
- In HKEY_CURRENT_USER
- HKEY_CURRENT_USER
Step 5
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
- File = "%User Temp%\231120111142.exe"
- In HKEY_CURRENT_USER\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
- EnableLUA = "{malware path and file name}"
- In HKEY_CURRENT_USER\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
- EnableLUA = "%User Temp%\231120111142.exe"
Step 6
Search and delete these files
- %User Temp%\_thunbs2.db
- %User Temp%\231120111142.exe
Step 7
Search and delete these folders
- %System Root%\Mcrosoft
- %System Root%\Mcrosoft\SysComerc
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_SCAR.ABG. 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.
Step 9
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.
- %Program Files%\avg\avg9\avgwdsvc.exe
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