Authored By:
TomU @c_APT_ure
Description:
This IOC detects malware that abuses the WinLogon Shell as persistence mechanism to startup. Normally this value should just be “explorer.exe”.
http://home.mcafee.com/virusinfo/virusprofile.aspx?key=1567958#none
The following registry elements have been changed:
- HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\WINDOWS NT\CURRENTVERSION\WINLOGON\SHELL = %APPDATA%\07F4HkiN.exe
- HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS NT\CURRENTVERSION\WINLOGON\SHELL = %APPDATA%\07F4HkiN.exe
http://home.mcafee.com/VirusInfo/VirusProfile.aspx?key=1585881#none
The following registry elements have been changed:
- HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\WINDOWS NT\CURRENTVERSION\WINLOGON\SHELL = %APPDATA%\5w4yher54uyhw4.exe
- HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS NT\CURRENTVERSION\WINLOGON\SHELL = %APPDATA%\5w4yher54uyhw4.exe
http://www.threatexpert.com/report.aspx?md5=0e961bed52b8063945c9d528ad0669ed
The newly created Registry Value is:
[HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Winlogon]
Shell = “Explorer.exe “C:\recycled\SVCHOST.exe”"
Reports:
http://home.mcafee.com/VirusInfo/VirusProfile.aspx?key=1585881
http://home.mcafee.com/virusinfo/virusprofile.aspx?key=1567958
http://www.threatexpert.com/report.aspx?md5=0e961bed52b8063945c9d528ad0669ed
Indicators:
OR
AND
Registry Keypath contains SOFTWARE\MICROSOFT\WINDOWS NT\CURRENTVERSION\WINLOGON
Registry Value Name is SHELL
OR
Registry Value contains %AppData%
Registry Value contains %Application Data%
Registry Value contains %User Profile%
Registry Value contains \Users
Registry Value contains \Documents
Registry Value contains %Temp%
Registry Value contains \Recycled
Registry Value contains \Temp
Download:
93b3a82d-230d-49e9-926c-c0e506fda033
