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Alerts May 2007

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Top 10 malware reported to Sophos in May 2007

Position Last
month
Malware Percentage of reports
1 Re-entry W32/Sober
   29.0%
2 1 W32/Netsky
   26.9%
3 3 W32/Mytob
   13.1%
4 4 W32/Stratio
   6.1%
5 7 W32/MyDoom
   4.1%
6 5 W32/Zafi
   3.9%
7 New Mal/Behav
   3.8%
8= 6 W32/Sality
   3.3%
8= 8 W32/Bagle
   3.3%
10 9 W32/Nyxem
   1.8%
Others 4.2%

 

This section is for technical experts who want to know more.
 

W32/Sober-AD is a mass-mailing worm for the Windows platform.
 

When W32/Sober-AD is installed it copies itself to:

<Windows>\PoolData\csrss.exe
<Windows>\PoolData\services.exe
<Windows>\PoolData\smss.exe

and creates the following files:

<Windows>\PoolData\WinD.osa
<Windows>\PoolData\runnor.ssy
<Windows>\PoolData\spxttx1.xnt
 


These files can be deleted.

The following registry entries are created to run W32/Sober-AD on startup:

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
_WinData
<Windows>\PoolData\services.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
WinData
<Windows>\PoolData\services.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce
_WinData
<Windows>\PoolData\services.exe %1

The emails sent by W32/Sober-AD may have the following characteristics:

Subject line chosen from:
Ihr Passwort wurde geaendert!
Ihr Passwort wurde erfolgreich geaendert.
Ihre neuen Account-Daten und Passwort befinden sich gesichert im Anhang!
PDaten Fehlerhafte Mailzustellung Diese Nachricht wurde Automatisch generiert.
Ihre EMail konnte nicht empfangen oder gesendet werden.
Ihr Account wurde eingerichtet!
Danke das Sie sich fuer uns entschieden haben.
Passw_Data Um ihren neuen Account zu aktivieren, folgen sie der kurzen Anleitung im Anhang.
Es sind nur 2 Schritte noetig!
Anleitung
Your eMail has occurred an unknown error on our Server.
Please read your mail and check the text.
The full email is attached!
 

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