TROJ_FAM_00001fe.TOMA
Scar.gen.c (McAfee); Trojan Horse (Symantec); Trojan.Win32.Swisyn.yrg (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)
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.
It modifies files, disabling programs and applications from properly running.
TECHNICAL DETAILS
1,297,645 bytes
EXE
No
31 Oct 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 creates the following folders:
- %Windows%\services
- %Windows%\services\rc0
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
Other System Modifications
This Trojan modifies the following files:
- %System%\dllcache\notepad.exe
- %System%\notepad.exe
- %Windows%\notepad.exe
- %System%\dllcache\mspaint.exe
- %System%\mspaint.exe
- %System%\dllcache\cmd.exe
- %System%\cmd.exe
- %System%\dllcache\calc.exe
- %System%\calc.exe
- %System%\dllcache\cleanmgr.exe
- %System%\cleanmgr.exe
- %System%\dllcache\taskmgr.exe
- %System%\taskmgr.exe
- %System%\dllcache\regedit.exe
- %Windows%\regedit.exe
- %System%\dllcache\scrnsave.scr
- %System%\scrnsave.scr
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Applets\
Paint
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Applets\
Paint\Recent File List
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Applets\
Paint\Settings
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Applets\
Paint\View
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Applets\
Paint\Text
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Applets\
Paint\Colors
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Applets\
Paint\General-Summary
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows
load = "%Windows%\services\rc0\service.exe"
Dropping Routine
This Trojan drops the following files:
- %User Temp%\tro1351668174.exe
- {malware path and file name}_uinst.exe
- %Windows%\services\rc0\service.exe
- %System%\dllcache\notepad.exe.tmp
- %System%\notepad.exe.tmp
- %Windows%\notepad.exe.tmp
- %System%\dllcache\mspaint.exe.tmp
- %System%\mspaint.exe.tmp
- %System%\dllcache\cmd.exe.tmp
- %System%\cmd.exe.tmp
- %System%\dllcache\calc.exe.tmp
- %System%\calc.exe.tmp
- %System%\dllcache\cleanmgr.exe.tmp
- %System%\cleanmgr.exe.tmp
- %System%\dllcache\taskmgr.exe.tmp
- %System%\taskmgr.exe.tmp
- %System%\dllcache\regedit.exe.tmp
- %Windows%\regedit.exe.tmp
- %System%\dllcache\scrnsave.scr.tmp
- %System%\scrnsave.scr.tmp
(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.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
This report is generated via an automated analysis system.
SOLUTION
9.300
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
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\Microsoft\Windows\CurrentVersion\Applets
- Paint
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets\Paint
- Recent File List
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets\Paint
- Settings
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets\Paint
- View
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets\Paint
- Text
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets\Paint
- Colors
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets\Paint
- General-Summary
Step 3
Restore this modified 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 NT\CurrentVersion\Windows
- load = "%Windows%\services\rc0\service.exe"
Step 4
Search and delete these files
- %User Temp%\tro1351668174.exe
- {malware path and file name}_uinst.exe
- %Windows%\services\rc0\service.exe
- %System%\dllcache\notepad.exe.tmp
- %System%\notepad.exe.tmp
- %Windows%\notepad.exe.tmp
- %System%\dllcache\mspaint.exe.tmp
- %System%\mspaint.exe.tmp
- %System%\dllcache\cmd.exe.tmp
- %System%\cmd.exe.tmp
- %System%\dllcache\calc.exe.tmp
- %System%\calc.exe.tmp
- %System%\dllcache\cleanmgr.exe.tmp
- %System%\cleanmgr.exe.tmp
- %System%\dllcache\taskmgr.exe.tmp
- %System%\taskmgr.exe.tmp
- %System%\dllcache\regedit.exe.tmp
- %Windows%\regedit.exe.tmp
- %System%\dllcache\scrnsave.scr.tmp
- %System%\scrnsave.scr.tmp
Step 5
Search and delete these folders
- %Windows%\services
- %Windows%\services\rc0
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_FAM_00001fe.TOMA. 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 7
Restore deleted/modified files and/or registry entries from backup
*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- %System%\dllcache\notepad.exe
- %System%\notepad.exe
- %Windows%\notepad.exe
- %System%\dllcache\mspaint.exe
- %System%\mspaint.exe
- %System%\dllcache\cmd.exe
- %System%\cmd.exe
- %System%\dllcache\calc.exe
- %System%\calc.exe
- %System%\dllcache\cleanmgr.exe
- %System%\cleanmgr.exe
- %System%\dllcache\taskmgr.exe
- %System%\taskmgr.exe
- %System%\dllcache\regedit.exe
- %Windows%\regedit.exe
- %System%\dllcache\scrnsave.scr
- %System%\scrnsave.scr
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