TROJ_FAKEAVAL.JL
Rogue:Win32/FakeXPA, Rogue:Win32/FakeXPA, Rogue:Win32/FakeXPA, Trojan:BAT/Killav.D, Rogue:Win32/Fake (Microsoft); [2.nsis]:Generic FakeAlert!ck, [3.nsis]:Generic FakeAlert!ct, [4.nsis]:ProcKill-ET, [6.nsis]:Generic (McAfee); Trojan.FakeAV (Symantec); Trojan-FakeAV.Win32.SecurityCenter.by (Kaspersky); Trojan.Win32.Generic.pak!cobra, Trojan.Fakeavalert, Trojan.Win32.Generic!BT, Trojan.Win32.Generic.pa (Sunbelt); Trojan horse Agent2.UXI (AVG)
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
1,253,555 bytes
EXE
Yes
09 Jun 2013
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:
- %User Profile%\Application Data\gwr
- %System Root%\DOCUME~1
- %System Root%\DOCUME~1\Wilbert
- %User Profile%\LOCALS~1
- %User Temp%\nsz7.tmp
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
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
69387646557683 = "%User Profile%\gwr\wsn.bat"
It registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{A5DBD8CB-DF8A-4992-A655-B155216F6AFB}
Other System Modifications
This Trojan deletes the following files:
- %User Temp%\nsm1.tmp
- %User Temp%\nsz7.tmp
- %User Temp%\nsz7.tmp\nsB.tmp
- %User Temp%\nsz7.tmp\nsE.tmp
- %User Temp%\nsq14.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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\{29256442-2C14-48CA-B756-3EE0F8BDC774}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\WStech.DLL
HKEY_CLASSES_ROOT\WStech.WStechB.1
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
WStech.WStechB.1\CLSID
HKEY_CLASSES_ROOT\WStech.WStechB
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
WStech.WStechB\CLSID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
WStech.WStechB\CurVer
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A5DBD8CB-DF8A-4992-A655-B155216F6AFB}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A5DBD8CB-DF8A-4992-A655-B155216F6AFB}\ProgID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A5DBD8CB-DF8A-4992-A655-B155216F6AFB}\VersionIndependentProgID
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A5DBD8CB-DF8A-4992-A655-B155216F6AFB}\Programmable
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A5DBD8CB-DF8A-4992-A655-B155216F6AFB}\InprocServer32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A5DBD8CB-DF8A-4992-A655-B155216F6AFB}\TypeLib
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{512E801E-2F02-4ADE-ACAA-58F08A22B2F8}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{512E801E-2F02-4ADE-ACAA-58F08A22B2F8}\1.0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{512E801E-2F02-4ADE-ACAA-58F08A22B2F8}\1.0\
FLAGS
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{512E801E-2F02-4ADE-ACAA-58F08A22B2F8}\1.0\
0
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{512E801E-2F02-4ADE-ACAA-58F08A22B2F8}\1.0\
0\win32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{512E801E-2F02-4ADE-ACAA-58F08A22B2F8}\1.0\
HELPDIR
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{051C9A06-FB08-486F-B09B-8B33B261637D}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{051C9A06-FB08-486F-B09B-8B33B261637D}\ProxyStubClsid
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{051C9A06-FB08-486F-B09B-8B33B261637D}\ProxyStubClsid32
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{051C9A06-FB08-486F-B09B-8B33B261637D}\TypeLib
HKEY_CURRENT_USER\Software\GAV
HKEY_CURRENT_USER\Software\GAV\
rwg
HKEY_CURRENT_USER\Software\GAV\
rwg\{A572C931-FFEA-4f70-B0D4-AC5432C425E0}
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\WStech.DLL
AppID = "{29256442-2C14-48CA-B756-3EE0F8BDC774}"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{A5DBD8CB-DF8A-4992-A655-B155216F6AFB}\InprocServer32
ThreadingModel = "Apartment"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{A5DBD8CB-DF8A-4992-A655-B155216F6AFB}
NoExplorer = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{051C9A06-FB08-486F-B09B-8B33B261637D}\TypeLib
Version = "1.0"
HKEY_CURRENT_USER\Software\GAV\
rwg\{A572C931-FFEA-4f70-B0D4-AC5432C425E0}
{9BB761E6-288E-4782-8538-9069141F34B6} = "1"
HKEY_CURRENT_USER\Software\GAV\
rwg\{A572C931-FFEA-4f70-B0D4-AC5432C425E0}
{BE8A5069-82B0-4214-98DB-715C2B6D3117} = "{random values}"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
AntiVirusDisableNotify = "1"
Dropping Routine
This Trojan drops the following files:
- %User Profile%\gwr\rwg.exe
- %User Profile%\gwr\WStech.dll
- %User Profile%\gwr\wsn.bat
- %User Temp%\nsz7.tmp\nsExec.dll
- %User Profile%\gwr\mwrdll.exe
- %User Profile%\gwr\Viruses.dat
- %User Profile%\gwr\wtds05.exe
- %User Temp%\nsz7.tmp\nsB.tmp
- %User Temp%\nsz7.tmp\nsE.tmp
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
This report is generated via an automated analysis system.
SOLUTION
9.300
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
Restart in Safe Mode
Step 3
Close all opened browser windows
Step 4
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\Classes\AppID
- {29256442-2C14-48CA-B756-3EE0F8BDC774}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID
- WStech.DLL
- In HKEY_CLASSES_ROOT
- WStech.WStechB.1
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\WStech.WStechB.1
- CLSID
- In HKEY_CLASSES_ROOT
- WStech.WStechB
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\WStech.WStechB
- CLSID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\WStech.WStechB
- CurVer
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
- {A5DBD8CB-DF8A-4992-A655-B155216F6AFB}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A5DBD8CB-DF8A-4992-A655-B155216F6AFB}
- ProgID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A5DBD8CB-DF8A-4992-A655-B155216F6AFB}
- VersionIndependentProgID
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A5DBD8CB-DF8A-4992-A655-B155216F6AFB}
- Programmable
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A5DBD8CB-DF8A-4992-A655-B155216F6AFB}
- InprocServer32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A5DBD8CB-DF8A-4992-A655-B155216F6AFB}
- TypeLib
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
- {512E801E-2F02-4ADE-ACAA-58F08A22B2F8}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{512E801E-2F02-4ADE-ACAA-58F08A22B2F8}
- 1.0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{512E801E-2F02-4ADE-ACAA-58F08A22B2F8}\1.0
- FLAGS
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{512E801E-2F02-4ADE-ACAA-58F08A22B2F8}\1.0
- 0
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{512E801E-2F02-4ADE-ACAA-58F08A22B2F8}\1.0\0
- win32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{512E801E-2F02-4ADE-ACAA-58F08A22B2F8}\1.0
- HELPDIR
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
- {051C9A06-FB08-486F-B09B-8B33B261637D}
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{051C9A06-FB08-486F-B09B-8B33B261637D}
- ProxyStubClsid
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{051C9A06-FB08-486F-B09B-8B33B261637D}
- ProxyStubClsid32
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{051C9A06-FB08-486F-B09B-8B33B261637D}
- TypeLib
- In HKEY_CURRENT_USER\Software
- GAV
- In HKEY_CURRENT_USER\Software\GAV
- rwg
- In HKEY_CURRENT_USER\Software\GAV\rwg
- {A572C931-FFEA-4f70-B0D4-AC5432C425E0}
Step 5
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
- 69387646557683 = "%User Profile%\gwr\wsn.bat"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID\WStech.DLL
- AppID = "{29256442-2C14-48CA-B756-3EE0F8BDC774}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{A5DBD8CB-DF8A-4992-A655-B155216F6AFB}\InprocServer32
- ThreadingModel = "Apartment"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{A5DBD8CB-DF8A-4992-A655-B155216F6AFB}
- NoExplorer = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{051C9A06-FB08-486F-B09B-8B33B261637D}\TypeLib
- Version = "1.0"
- In HKEY_CURRENT_USER\Software\GAV\rwg\{A572C931-FFEA-4f70-B0D4-AC5432C425E0}
- {9BB761E6-288E-4782-8538-9069141F34B6} = "1"
- In HKEY_CURRENT_USER\Software\GAV\rwg\{A572C931-FFEA-4f70-B0D4-AC5432C425E0}
- {BE8A5069-82B0-4214-98DB-715C2B6D3117} = "{random values}"
Step 6
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- AntiVirusDisableNotify = "1"
Step 7
Search and delete these components
- %User Profile%\gwr\rwg.exe
- %User Profile%\gwr\WStech.dll
- %User Profile%\gwr\wsn.bat
- %User Temp%\nsz7.tmp\nsExec.dll
- %User Profile%\gwr\mwrdll.exe
- %User Profile%\gwr\Viruses.dat
- %User Profile%\gwr\wtds05.exe
- %User Temp%\nsz7.tmp\nsB.tmp
- %User Temp%\nsz7.tmp\nsE.tmp
Step 8
Search and delete these folders
- %User Profile%\Application Data\gwr
- %System Root%\DOCUME~1
- %System Root%\DOCUME~1\Wilbert
- %User Profile%\LOCALS~1
- %User Temp%\nsz7.tmp
Step 9
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_FAKEAVAL.JL. 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 10
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%\nsm1.tmp
- %User Temp%\nsz7.tmp
- %User Temp%\nsz7.tmp\nsB.tmp
- %User Temp%\nsz7.tmp\nsE.tmp
- %User Temp%\nsq14.tmp
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