TROJ_FAKEAV.QAE
Rogue:Win32/FakeRean (Microsoft); FakeAlert-CN.gen.aa (McAfee); Trojan.FakeAV!gen69 (Symantec); FraudTool.Win32.FakeRean.b (v) (Sunbelt); Gen:Variant.Kazy.15159 (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.
It disables Task Manager, Registry Editor, and Folder Options.
It deletes itself after execution.
TECHNICAL DETAILS
319,488 bytes
EXE
No
01 Jun 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.
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\.exe
HKEY_CURRENT_USER\.exe\DefaultIcon
HKEY_CURRENT_USER\.exe\shell
HKEY_CURRENT_USER\.exe\shell\
open
HKEY_CURRENT_USER\.exe\shell\
open\command
HKEY_CURRENT_USER\.exe\shell\
runas
HKEY_CURRENT_USER\.exe\shell\
runas\command
HKEY_CURRENT_USER\exefile
HKEY_CURRENT_USER\exefile\DefaultIcon
HKEY_CURRENT_USER\exefile\shell
HKEY_CURRENT_USER\exefile\shell\
open
HKEY_CURRENT_USER\exefile\shell\
open\command
HKEY_CURRENT_USER\exefile\shell\
runas
HKEY_CURRENT_USER\exefile\shell\
runas\command
It adds the following registry entries:
HKEY_CURRENT_USER\.exe
Content Type = "application/x-msdownload"
HKEY_CURRENT_USER\.exe\shell\
open\command
IsolatedCommand = "%1 %*"
HKEY_CURRENT_USER\.exe\shell\
runas\command
IsolatedCommand = "%1 %*"
HKEY_CURRENT_USER\exefile
Content Type = "application/x-msdownload"
HKEY_CURRENT_USER\exefile\shell\
open\command
IsolatedCommand = "%1 %*"
HKEY_CURRENT_USER\exefile\shell\
runas\command
IsolatedCommand = "%1 %*"
HKEY_CURRENT_USER\Software\Microsoft\
Windows
Identity = "6915d928"
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
ctfmon.exe = "%System%\ctfmon.exe"
(Note: The default value data of the said registry entry is %Windows%\system32\ctfmon.exe.)
It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
HideSCAHealth = "1"
Dropping Routine
This Trojan drops the following files:
- %Application Data%\rha.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.)
Other Details
This Trojan deletes itself after execution.
This report is generated via an automated analysis system.
SOLUTION
9.200
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
Enable Registry Editor, Task Manager, and Folder options
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
- .exe
- In HKEY_CURRENT_USER\.exe
- DefaultIcon
- In HKEY_CURRENT_USER\.exe
- shell
- In HKEY_CURRENT_USER\.exe\shell
- open
- In HKEY_CURRENT_USER\.exe\shell\open
- command
- In HKEY_CURRENT_USER\.exe\shell
- runas
- In HKEY_CURRENT_USER\.exe\shell\runas
- command
- In HKEY_CURRENT_USER
- exefile
- In HKEY_CURRENT_USER\exefile
- DefaultIcon
- In HKEY_CURRENT_USER\exefile
- shell
- In HKEY_CURRENT_USER\exefile\shell
- open
- In HKEY_CURRENT_USER\exefile\shell\open
- command
- In HKEY_CURRENT_USER\exefile\shell
- runas
- In HKEY_CURRENT_USER\exefile\shell\runas
- command
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\.exe
- Content Type = "application/x-msdownload"
- In HKEY_CURRENT_USER\.exe\shell\open\command
- IsolatedCommand = "%1 %*"
- In HKEY_CURRENT_USER\.exe\shell\runas\command
- IsolatedCommand = "%1 %*"
- In HKEY_CURRENT_USER\exefile
- Content Type = "application/x-msdownload"
- In HKEY_CURRENT_USER\exefile\shell\open\command
- IsolatedCommand = "%1 %*"
- In HKEY_CURRENT_USER\exefile\shell\runas\command
- IsolatedCommand = "%1 %*"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows
- Identity = "6915d928"
Step 5
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\Windows\CurrentVersion\Run
- From: ctfmon.exe = "%System%\ctfmon.exe"
To: ctfmon.exe = ""%Windows%\system32\ctfmon.exe""
- From: ctfmon.exe = "%System%\ctfmon.exe"
Step 6
Search and delete this file
- %Application Data%\rha.exe
Step 7
Scan your computer with your Trend Micro product to delete files detected as TROJ_FAKEAV.QAE. 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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