TROJ_FAKEAV.SMBQ
Rogue:Win32/FakeRean (Microsoft); Trojan.FakeAV!gen32 (Symantec); Trojan.Win32.FakeAv.jcfp (Kaspersky); LooksLike.Win32.Malware!D (v) (Sunbelt); Trojan-Downloader:W32/Renos.GTC (FSecure)
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 drops the following copies of itself into the affected system:
- %Desktop% Security\securityhelper.exe
(Note: %Desktop% is the current user's desktop, which is usually C:\Windows\Profiles\{user name}\Desktop on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Desktop on Windows NT, and C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003.)
It creates the following folders:
- %Start Menu%\Programs\Desktop Security
- %Desktop% Security
(Note: %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Profiles\{user name}\Start Menu on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu on Windows NT and C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003.. %Desktop% is the current user's desktop, which is usually C:\Windows\Profiles\{user name}\Desktop on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Desktop on Windows NT, and C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003.)
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
d6kwp5uwfww5 = "{malware path and file name}"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
SecurityCenter = "%Desktop% Security\securitycenter.exe"
Other System Modifications
This Trojan deletes the following files:
- {malware path and file name}:zone.identifier
- %Desktop% Security\securityhelper.exe
(Note: %Desktop% is the current user's desktop, which is usually C:\Windows\Profiles\{user name}\Desktop on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Desktop on Windows NT, and C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
User Agent
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
User Agent\Post Platform
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Desktop Security
LastTimeStamp = "18"
HKEY_CURRENT_USER\Software\Desktop Security
LastUpdateDate = "2011/12/4"
Dropping Routine
This Trojan drops the following files:
- %User Temp%\qas1.tmp
- %User Temp%\_2.tmpac7d.exe
- %Start Menu%\Programs\Desktop Security.lnk
- %Start Menu%\Programs\Desktop Security\Desktop Security.lnk
- %Start Menu%\Programs\Desktop Security\Activate Desktop Security.lnk
- %Start Menu%\Programs\Desktop Security\How to Activate Desktop Security.lnk
- %Start Menu%\Programs\Desktop Security\Help Desktop Security.lnk
- %Desktop% Security.lnk
- %Desktop% Security 2010.exe
- %Desktop% Security\securitycenter.exe
- %Desktop% Security\taskmgr.dll
- %User Temp%\qas3.tmp
- %User Temp%\wrfwe_di.exe
- %User Temp%\winlogoff.exe
- %User Temp%\472a10e2ebxd9.exe
- %User Temp%\ds7hw.exe
- %User Temp%\lols.exe
- %User Temp%\dc_3.exe
- %User Temp%\qwedvor.exe
- %User Temp%\dd10x10.exe
- %User Temp%\qas4.tmp
- %User Temp%\qas5.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.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Profiles\{user name}\Start Menu on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu on Windows NT and C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003.. %Desktop% is the current user's desktop, which is usually C:\Windows\Profiles\{user name}\Desktop on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Desktop on Windows NT, and C:\Documents and Settings\{User Name}\Desktop 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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
- User Agent
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\User Agent
- Post Platform
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
- d6kwp5uwfww5 = "{malware path and file name}"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- SecurityCenter = "%Desktop% Security\securitycenter.exe"
- In HKEY_CURRENT_USER\Software\Desktop Security
- LastTimeStamp = "18"
- In HKEY_CURRENT_USER\Software\Desktop Security
- LastUpdateDate = "2011/12/4"
Step 5
Search and delete these files
- %User Temp%\qas1.tmp
- %User Temp%\_2.tmpac7d.exe
- %Start Menu%\Programs\Desktop Security.lnk
- %Start Menu%\Programs\Desktop Security\Desktop Security.lnk
- %Start Menu%\Programs\Desktop Security\Activate Desktop Security.lnk
- %Start Menu%\Programs\Desktop Security\How to Activate Desktop Security.lnk
- %Start Menu%\Programs\Desktop Security\Help Desktop Security.lnk
- %Desktop% Security.lnk
- %Desktop% Security 2010.exe
- %Desktop% Security\securitycenter.exe
- %Desktop% Security\taskmgr.dll
- %User Temp%\qas3.tmp
- %User Temp%\wrfwe_di.exe
- %User Temp%\winlogoff.exe
- %User Temp%\472a10e2ebxd9.exe
- %User Temp%\ds7hw.exe
- %User Temp%\lols.exe
- %User Temp%\dc_3.exe
- %User Temp%\qwedvor.exe
- %User Temp%\dd10x10.exe
- %User Temp%\qas4.tmp
- %User Temp%\qas5.tmp
Step 6
Search and delete these folders
- %Start Menu%\Programs\Desktop Security
- %Desktop% Security
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_FAKEAV.SMBQ. 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.
- {malware path and file name}:zone.identifier
- %Desktop% Security\securityhelper.exe
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