Additional Details
Sasser.F is an unpacked, edited and repacked version of Sasser.A.
For full details, please refer to the Sasser.A description:
http://www.f-secure.com/v-descs/sasser.shtml
System Infection
When the worm enters the system it creates a copy of itself in
the Windows Directory as 'napatch.exe'. This copy is added to the
Registry as
[SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"napatch.exe" = "%WinDir%\napatch.exe"
To ensure that only one copy of the worm is running it creates a
mutex named 'billgate'.
Detection
Detection in F-Secure Anti-Virus was published on May 11th, 2004 in
update:
[FSAV_Database_Version]
Version=2004-05-11_01
Technical Details:
Gergely Erdelyi & Ero Carrera, May 11th, 2004