TROJ_FAKESYSD.TN
Trojan.Fakefrag (Symantec), Trojan:Win32/FakeSysdef (Microsoft), Mal/FakeAV-OP (Sophos), TrojanFakeAV.FakeRecovery.dk (VBA 32)
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
372,736 bytes
EXE
Yes
06 Jan 2012
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:
- %Application Data%\{random characters}.exe
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)
It drops the following file(s)/component(s):
- %Application Data%\{random characters}.exe
- %Application Data%\Microsoft\Internet Explorer\Quick Launch\System Fix.lnk
- %Start Menu%\Programs\System Fix\System Fix.lnk
- %Start Menu%\Programs\System Fix\Uninstall System Fix.lnk
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data 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.)
It creates the following folders:
- %Start Menu%\Programs\System Fix
(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.)
Other System Modifications
This Trojan adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Use FormSuggest = "Yes"
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
MessengerService
Server = "messenger.hotmail.com;64.4.61.35:1863"
(Note: The default value data of the said registry entry is messenger.hotmail.com;64.4.9.254:1863.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\3
1601 = "0"
(Note: The default value data of the said registry entry is 1.)
SOLUTION
9.200
8.698.04
09 Jan 2012
8.699.00
10 Jan 2012
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
Identify and terminate files detected as TROJ_FAKESYSD.TN
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
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_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- Use FormSuggest = "Yes"
- Use FormSuggest = "Yes"
Step 4
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_CURRENT_USER\Software\Microsoft\MessengerService
- From: Server = "messenger.hotmail.com;64.4.61.35:1863"
To: Server = "messenger.hotmail.com;64.4.9.254:1863"
- From: Server = "messenger.hotmail.com;64.4.61.35:1863"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3
- From: 1601 = "0"
To: 1601 = "1"
- From: 1601 = "0"
Step 5
Search and delete these files
- %Application Data%\{random characters}.exe
- %Application Data%\Microsoft\Internet Explorer\Quick Launch\System Fix.lnk
Step 6
Search and delete this folder
- %Start Menu%\Programs\System Fix
Step 7
Scan your computer with your Trend Micro product to delete files detected as TROJ_FAKESYSD.TN. 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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