TROJ_FAKEAV.SMUB
VirTool:Win32/Obfuscator.QR (Microsoft); W32/Pinkslipbot.gen.af (McAfee); W32.Qakbot!gen5 (Symantec); Net-Worm.Win32.Kolab.adrx (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.5708085 (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
218,199 bytes
EXE
01 Oct 2011
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.
Other System Modifications
This Trojan deletes the following files:
- .\1.tmp
- .\2.tmp
- %System%\spool\PRTPROCS\W32X86\SMWinPrn.dat
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Control\Session Manager\AppCertDlls
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Session Manager\AppCertDlls
DefaultVerifier = "%Program Files%\Internet Explorer\setupapi.dll"
Dropping Routine
This Trojan drops the following files:
- %Program Files%\Internet Explorer\setupapi.dll
- %Program Files%\Opera\setupapi.dll
- %Program Files%\Mozilla Firefox\setupapi.dll
- %System%\spool\PRTPROCS\W32X86\SMWinPrn.dat
(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).. %System% is the Windows system folder, which is usually C:\Windows\System32.)
This report is generated via an automated analysis system.
SOLUTION
9.200
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
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\System\CurrentControlSet\Control\Session Manager
- AppCertDlls
Step 3
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_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Session Manager\AppCertDlls
- DefaultVerifier="%Program Files%\Internet Explorer\setupapi.dll"
Step 4
Search and delete these files
- %Program Files%\Internet Explorer\setupapi.dll
- %Program Files%\Opera\setupapi.dll
- %Program Files%\Mozilla Firefox\setupapi.dll
- %System%\spool\PRTPROCS\W32X86\SMWinPrn.dat
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_FAKEAV.SMUB. 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.
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