TROJ_KILLMBR.DZ
Trojan:Win32/Killav.GZ (Microsoft), Trojan Horse (Symantec), Troj/MBRKill-A (Sophos), Gen:Trojan.Heur.JP.dq0@aGAAq2cG (Bitdefender), Win.Trojan.Agent-257543 (ClamAV), W32/Kast.A!tr (Fortinet), Trojan-PWS.Win32.Fareit (Ikarus), OScope.Trojan.KillMBR.2113 (VBA32)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
TECHNICAL DETAILS
49,152 bytes
EXE
No
23 Mar 2013
Arrival Details
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
Installation
This Trojan drops the following files:
- %Program Files%\Hauri\SiteServer\vismsupdate\vms1014.zip - (contains OthDown.exe) detected as TROJ_KILLMBR.SM
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
It drops the following non-malicious files:
- %Program Files%\Hauri\SiteServer\vismsupdate\update.zip
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
Other System Modifications
This Trojan deletes the following files:
- %Program Files%\hauri\SiteClient\VrDown.exe
- %Program Files%\Hauri\SiteServer\VrPatch.exe
- %Program Files%\Hauri\SiteServer\ptUpdate.exe
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\Software\VMS\
3.0\SiteServer\General
CenterServer = "hahaha"
(Note: The default value data of the said registry entry is "{Software default value}".)
HKEY_LOCAL_MACHINE\Software\VMS\
3.0\SiteServer\CfgInfo
ISMS = "56be65cd"
(Note: The default value data of the said registry entry is "{Software default value}".)
Process Termination
This Trojan terminates the following processes if found running in the affected system's memory:
- vrfwsvc.exe
- vrptsvc.exe
- vrscan.exe
- hpcsvc.exe
- hsvcmod.exe
- vrfwsock.exe
- vrfwsvc.exe
- vrmonnt.exe
- vrrepair.exe
- vrmonsvc.exe
- hsvcmod.exe
- hpcsvc.exe
NOTES:
It drops file to a certain security software update folder. Therefore, when the said software updates, the dropped file (TROJ_KILLMBR.SM) is executed.
SOLUTION
9.300
9.818.04
23 Mar 2013
9.819.00
23 Mar 2013
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
Remove malware/grayware files dropped/downloaded by TROJ_KILLMBR.DZ
- TROJ_KILLMBR.SM
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_LOCAL_MACHINE\Software\VMS\3.0\SiteServer\General
- From: CenterServer = "hahaha"
To: CenterServer = "{Software default value}"
- From: CenterServer = "hahaha"
- In HKEY_LOCAL_MACHINE\Software\VMS\3.0\SiteServer\CfgInfo
- From: ISMS = "56be65cd"
To: ISMS = "{Software default value}"
- From: ISMS = "56be65cd"
Step 4
Search and delete this file
- %Program Files%\Hauri\SiteServer\vismsupdate\update.zip
- %Program Files%\Hauri\SiteServer\vismsupdate\vms1014.zip
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_KILLMBR.DZ. 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 6
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%\hauri\SiteClient\VrDown.exe
- %Program Files%\Hauri\SiteServer\VrPatch.exe
- %Program Files%\Hauri\SiteServer\ptUpdate.exe
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