F-Secure is downgrading the alert level on Bagle worm since it reached
its deadline.
The worm was programmed to stop spreading after January 25th, 2004.
Update on February 17th, 2004
F-Secure is upgrading Bagle.B worm to Level 1, as it keeps
spreading rapidly. It arrives in email with random subject and
attachment name with an EXE extension. The worm installs a
backdoor that listens on port 8866.
Bagle.B worm has been programmed to stop spreading on February 25th.
Summary
Found on 17th of February 2004, Bagle.B is a variant of the
successful Bagle. As its predecessor it is mass-mailing worm.
The worm sends messages with the subject 'ID [random string]...
thanks' and random EXE attachment names. It also installs a
backdoor. Bagle has been programmed to stop spreading on 25th of
February.
Disinfection
Special Disinfection Tool
F-Secure has developed a special disinfection tool for this worm.
The tool will detect and remove an active Bagle infection from
the computer.
The Bagle removal tool can be downloaded in a ZIP file from:
System administrators who are using F-Secure Policy Manager, can
distribute the F-BAGLE tool as a JAR package automatically to all
workstations. The package can be downloaded from:
The worm will access four different URLs contained within its
body. They are located on three different web sites:
www.47df.de
www.strato.de
intern.games-ring.de
The target of the URLs are PHP files, to which the worm will post information
about the infected host, namely the port where the backdoor is listening and a
randomly generated ID.
Some of those hosts are already unavailable.
The worm will attempt to contact all of those URLs every 166 minutes, checking
in every iteration whether its internal deadline has been reached.
Email Propagation
The worm will send e-mails with the following characteristics:
Subject line is:
Subject: ID <random characters>... thanks
The body of the message will have the following format:
Yours ID <random characters>
--
Thank
The attachment name will be:
<random characters>.exe
It will harvest addresses from files with the extensions:
.html
.htm
.wab
.txt
It will avoid sending mail to addresses containing any of the following text strings:
.r1u
@hotmail.com
@msn.com
@microsoft
@avp.
Payload
This variant also contains a backdoor that will listen on port 8866. It
provides access to the computer where the worm is running, where it allows to
download and run any executable sent to the backdoor with a given format.
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