TROJ_FAKEALE.SMB
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted: No
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
51,712 bytes
EXE
Yes
26 Sep 2009
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 files:
- %System%\braviax.exe
- %System%\dllcache\figaro.sys
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
Other System Modifications
This Trojan modifies the following file(s):
- %System%\dllcache\beep.sys
- %System%\drivers\beep.sys
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Download
RunInvalidSignatures = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Associations
LowRiskFileTypes = "zip;.rar;.cab;.txt;.exe;.reg;.msi;.htm;.html;.gif;.bmp;.jpg;.avi;.mov;.mp3;.wav"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Associations
SaveZoneInformation = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
braviax = "%System%\braviax.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
braviax = "%System%\braviax.exe"
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Download
CheckExeSignatures = "no"
(Note: The default value data of the said registry entry is yes.)
Download Routine
This Trojan accesses the following websites to download files:
- http://{BLOCKED}herproger.com/d1S0z1NMW9loO0q4S1FrB0mQG6OKA
- http://{BLOCKED}aguliermot.com/qn1gy0xG1FJF9teD0Hz4vik1X0fy6nA
- http://{BLOCKED}dertogafe.com/gO1qxv0V1tRN9tO0VFy4D1ma0qW6V
- http://{BLOCKED}masekasuke.com/U1q0YsP1A9zZ0OWl4Yp1QEf0Hf/6h/d
- http://{BLOCKED}domegase.com/Hm1yb0ACF1gz9JoX0zbj4y1Uw0sq6r
- http://{BLOCKED}agulermos.com/h1J0F1eGx9bi0Ay4Cf1iO0k6lEW
- http://{BLOCKED}komandar.com/g1c0koa1Hn9f0WQC4if1cp0Hm6PZ
- http://{BLOCKED}anosetrat.com/gIh1a0K1ik9C0rYS4zr1jGz0SnA6b
- http://{BLOCKED}afoterkos.com/b/b1ftK0sV1oRr9Mk0Maz4Dbq1P0NPo6x
It saves the files it downloads using the following names:
- %System%\wisdstr.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
SOLUTION
9.200
6.480.02
26 Sep 2009
6.481.00
28 Sep 2009
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
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\Download
- RunInvalidSignatures = "1"
- RunInvalidSignatures = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Associations
- LowRiskFileTypes = "zip;.rar;.cab;.txt;.exe;.reg;.msi;.htm;.html;.gif;.bmp;.jpg;.avi;.mov;.mp3;.wav"
- LowRiskFileTypes = "zip;.rar;.cab;.txt;.exe;.reg;.msi;.htm;.html;.gif;.bmp;.jpg;.avi;.mov;.mp3;.wav"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Associations
- SaveZoneInformation = "1"
- SaveZoneInformation = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- braviax = "%System%\braviax.exe"
- braviax = "%System%\braviax.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- braviax = "%System%\braviax.exe"
- braviax = "%System%\braviax.exe"
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\Internet Explorer\Download
- From: CheckExeSignatures = "no"
To: CheckExeSignatures = "yes"
- From: CheckExeSignatures = "no"
Step 5
Search and delete this file
- %System%\braviax.exe
- %System%\dllcache\figaro.sys
- %System%\wisdstr.exe
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_FAKEALE.SMB. 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 7
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.
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