A new variant of Bagle - Bagle.U was found spreading in the
morning on March 26th, 2004. It is a very simple worm variant, it
sends itself with an empty subject, no body text and a randomly
named attachment.
The attachment has an icon which resembles a clock:
F-Secure provides the special disinfection utility to eliminate
Bagle.U worm infection. You can download this utility from our
ftp site:
ftp://ftp.f-secure.com/anti-virus/tools/f-bagle.exe
ftp://ftp.f-secure.com/anti-virus/tools/f-bagle.zip
Disinfection instructions can be found here:
ftp://ftp.f-secure.com/anti-virus/tools/f-bagle.txt
System administrators who are using F-Secure Policy Manager,
can distribute the tool as a JAR package automatically to all
workstations.
System administrators can download the JAR version from:
http://www.europe.f-secure.com/tools/f-bagle.jar
ftp://ftp.europe.f-secure.com/anti-virus/tools/f-bagle.jar
The worm's file is a PE executable 8208 bytes in long, packed
with FSG file compressor.
When the worm's file is run, it opens Microsoft Hearts card game
(MSHEARTS.EXE file). Then the worm copies itself to Windows
System folder as GIGABIT.EXE and creates a startup key for this
file in System Registry:
[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
"gigabit.exe" = "%winsysdir%\gigabit.exe"
where %winsysdir% represents Windows System folder name.
Before spreading the worm searches for e-mail addresses in files
with the following extensions:
.wab
.txt
.msg
.htm
.shtm
.stm
.xml
.dbx
.mbx
.mdx
.eml
.nch
.mmf
.ods
.cfg
.asp
.php
.pl
.wsh
.adb
.tbb
.sht
.xls
.oft
.uin
.cgi
.mht
.dhtm
.jsp
The worm avoids spreading to e-mail addresses, that contain any
of the following:
@avp.
@microsoft
The subject of the infected message is empty and there's no body
text. The attachment has a random name and EXE extension.
The worm has a backdoor that listens to port 4751. As before, the
worm connects to a website (this time it's only one website
located in Germany) and reports backdoor's ID and backdoor's port
to the worm author.
F-Secure Anti-Virus detects Bagle.U worm in the following update:
[FSAV_Database_Version]
Version=2004-03-26_01
Description:
Katrin Tocheva and Mikko Hypponen, March 26th, 2004;
Technical Details:
Alexey Podrezov, March 26th, 2004;
Description Updated:
Alexey Podrezov, April 1st, 2004;
F-Secure Corporation
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