[virusinfo] Sophos Anti-Virus IDE alert: W32/Sasser-A
- From: "Mike" <mikebike@xxxxxxxxx>
- To: virusinfo@xxxxxxxxxxxxx
- Date: Sat, 01 May 2004 07:38:59 -0700
From; Sophos Alert System:
Name: W32/Sasser-A
Aliases: W32/Sasser.worm
Type: Win32 worm
Date: 1 May 2004
A virus identity (IDE) file which provides protection is
available now from the Sophos website, and will be incorporated
into the June 2004 (3.82) release of Sophos Anti-Virus.
Customers using Enterprise Manager, PureMessage and any
of the Sophos small business solutions will be automatically
protected at their next scheduled update.
Information about W32/Sasser-A can be found at:
http://www.sophos.com/virusinfo/analyses/w32sassera.html
Description
W32/Sasser-A is a network worm that spreads by exploiting the Microsoft
LSASS vulnerability. Microsoft has issued a patch to secure against this
vulnerability which can be downloaded from Microsoft Security Bulletin
MS04-011.
The worm copies itself to the Windows folder with the filename avserve.exe
and sets the following registry key to auto-start on user logon:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run\avserve = avserve.exe
W32/Sasser-A attempts to connect out on port TCP/9996 and TCP/445 and
exploit the LSASS vulnerability. An FTP script is then downloaded and
executed which connects back on port 5554 to download a copy of the worm via
FTP.
Recovery
Please follow the instructions for removing worms.
Download the IDE file from:
http://www.sophos.com/downloads/ide/sasser-a.ide
Download all the IDE files available for the current version of
Sophos Anti-Virus in a single compressed file. The file is
available in two formats:
Zip file:
http://www.sophos.com/downloads/ide/ides.zip
Self-extracting file:
http://www.sophos.com/downloads/ide/ides.exe
Read about how to use IDE files at
http://www.sophos.com/downloads/ide/using.html
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