Sober is an email worm, sending messages in English
and German, sometimes posing as a fix from an Anti-Virus company.
Sober is an email worm that disguises itself as a security
warning for a possible new worm and a fix coming from an
Anti-Virus company. The worm uses attachment names such as
anti_virusdoc.pif, check-patch.bat, playme.exe.
The worm was packed with a modified version of UPX and was
written in Visual Basic. It has its own SMTP engine which will
be used when sending e-mail messages.
System installation
It will modify the Windows' registry under:
[HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
or
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
to point to where the executable copies of the worm are dropped.
Some of the possible locations are:
%SysDir%\similare.exe
%SysDir%\sysrunll.exe
E-mail spreading.
It will spoof different mail clients, using the headers:
X-Mailer: Microsoft Outlook Express 6.00.2600.0000
X-Mailer: Microsoft Outlook Express 5.00.3018.1300
X-Mailer: Safety_Mail Server
X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0)
X-Mailer: Microsoft Outlook IMO, Build 9.0.
It will send e-mails with the following subjects:
In german:
Neuer Virus im Umlauf!
Back At The Funny Farm
Sie versenden Spam Mails (Virus?)
Ein Wurm ist auf Ihrem Computer!
Langsam reicht es mir
Sie haben mir einen Wurm geschickt!
Hi Schnuckel was machst du so ?
VORSICHT!!! Neuer Mail Wurm
Re: Kontakt
RE: Sex
Sorry, Ich habe Ihre Mail bekommen
Hi Olle, lange niks mehr geh
Re: lol
Viurs blockiert jeden PC (Vorsicht!)
berraschung
Ich habe Ihre E-Mail bekommen !
Jetzt rate mal, wer ich bin !?
Neue Sobig Variante (Lesen!!)
Ich Liebe Dich
In english:
Congratulations!! Your Sobig Worms are very good!!!
You are a very good programmer!
Yours faithfully
Odin alias Anon
Odin_Worm.exe
New internet virus!
You send spam mails (Worm?)
A worm is on your computer!
You have sent me a virus!
Hi darling, what are you doing now?
Be careful! New mail worm
Re: Contact
Sorry, I've become your mail
Hey man, long not see you
Viurs blocked every PC (Take care!)
Surprise
I've become your mail!
Advise who I am!
New Sobig-Worm variation (please read)
I love you (I'm not a virus!)
I permanently get Spam-Mails from you and inside is a virus!!
You should remove these thing.
Attachment names are picked from the list:
AntiVirusDoc.pif
Check-Patch.bat
Screen_Doku.scr
Removal-Tool.exe
Perversionen.scr
CM-Recover.com
Bild.scr
schnitzel.exe
robot_mail.scr
RobotMailer.com
Privat.exe
AntiTrojan.exe
Mausi.scr
NackiDei.com
Anti-Sob.bat
security.pif
Funny.scr
Liebe.com
Odin_Worm.exe
check-patch.bat
anti_virusdoc.pif
perversion.scr
removal-tool.exe
screen_doc.scr
potency.pif
CM-Recover.com
pic.scr
playme.exe
robot_mailer.pif
private.exe
anti-trojan.exe
love.com
nacked.com
anti-Sob.bat
NAV.pif
funny.scr
little-scr.scr
F-Secure Anti-Virus starting from version 5.40 should
successfully rename both infected files thus disinfecting a
computer from Sober infection. If a Windows NT, 2000 or XP
operating system is used, it is recommended to restart a computer
after disinfection.
Detection in F-Secure Anti-Virus was published on October 24th,
2003 in update:
[FSAV_Database_Version]
Version=2003-10-24_01
Technical Details:
Ero Carrera
Write-up:
Katrin Tocheva, October 26th, 2003;
Description Updated:
Alexey Podrezov, November 11th, 2003;
F-Secure Corporation
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