TROJ_AGENT_004591.TOMB
Worm:Win32/Vobfus.gen!N, Trojan:Win32/Alureon.DX, Trojan:Win32/Hiloti.gen!D (Microsoft); Generic Dropper.zb (McAfee); Trojan.Gen (Symantec); Trojan-Dropper.Win32.TDSS.atwz (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.KDV.331444 (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
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%\Documents and Settings\Administrator
(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
booor = "%User Profile%\booor.exe /c"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Dgiwagimogoyine = "rundll32.exe "%Windows%\drapsc.dll",Startup"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /w"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /T"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /v"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /N"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /B"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /i"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /E"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /d"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /I"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /n"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /O"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /u"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /Z"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /F"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /H"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /s"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /o"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /h"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /Y"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /U"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /a"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /J"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /l"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /A"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /t"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /b"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /G"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /f"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /V"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /X"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
booor = "%User Profile%\booor.exe /y"
Other System Modifications
This Trojan deletes the following files:
- %User Temp%\2.tmp
- %User Profile%\X4FM93~1.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.. %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Jmecupetozuxahow
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Jmecupetozuxahow
Uwawemitedu = {random values}
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Jmecupetozuxahow
Dbeguwupomukimup = {random values}
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Jmecupetozuxahow
Asodepaguh = "201"
Dropping Routine
This Trojan drops the following files:
- %User Profile%\x4Fm93l7k9.exe
- %User Profile%\yes.exe
- %User Profile%\yet.exe
- %Windows%\drapsc.dll
- %User Temp%\1.tmp
(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %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
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
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion
- Jmecupetozuxahow
Step 4
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
- booor="%User Profile%\booor.exe /c"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Dgiwagimogoyine="rundll32.exe "%Windows%\drapsc.dll",Startup"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /w"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /T"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /v"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /N"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /B"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /i"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /E"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /d"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /I"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /n"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /O"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /u"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /Z"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /F"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /H"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /s"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /o"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /h"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /Y"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /U"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /a"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /J"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /l"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /A"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /t"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /b"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /G"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /f"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /V"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /X"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- booor="%User Profile%\booor.exe /y"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Jmecupetozuxahow
- Uwawemitedu={random values}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Jmecupetozuxahow
- Dbeguwupomukimup={random values}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Jmecupetozuxahow
- Asodepaguh="201"
Step 5
Search and delete this folder
Step 6
Search and delete these files
- %User Profile%\x4Fm93l7k9.exe
- %User Profile%\yes.exe
- %User Profile%\yet.exe
- %Windows%\drapsc.dll
- %User Temp%\1.tmp
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_AGENT_004591.TOMB. 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 8
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.
- %User Temp%\2.tmp
- %User Profile%\X4FM93~1.EXE
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