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Win32.HLLW.IRCBot.66
Added to the Dr.Web virus database:
2011-09-03
Virus description added:
2011-09-03
Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'ctfmon.exe' = '%APPDATA%\ctfmon.exe'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'ctfmon.exe' = '%APPDATA%\ctfmon.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'Microsoft Windows Firewall' = '%APPDATA%\winlogon.exe'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Microsoft Windows Firewall' = '%APPDATA%\winlogon.exe'
Malicious functions:
To complicate detection of its presence in the operating system,
blocks the following features:
User Account Control (UAC)
Creates and executes the following:
Injects code into
the following system processes:
Modifies file system :
Creates the following files:
%APPDATA%\tempFd_83[28]k-w.tmp
%WINDIR%\pchealth\ERRORREP\UserDumps\winlogon.exe.20110714-162821-00.mdmp
%APPDATA%\winlogon.exe
%APPDATA%\ctfmon.exe
Sets the 'hidden' attribute to the following files:
%APPDATA%\ctfmon.exe
%APPDATA%\winlogon.exe
Miscellaneous:
Searches for the following windows:
ClassName: '' WindowName: 'BitDefender Firewall Alert'
ClassName: '' WindowName: 'Windows Security Alert'
ClassName: 'Indicator' WindowName: ''
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