Virus:Worm/Zafi.D
Date discovered:14/12/2004
Type:Worm
In the wild:Yes
Reported Infections:Medium
Distribution Potential:Medium to high
Damage Potential:Medium
Static file:Yes
File size:11.745 Bytes
MD5 checksum:387ea0a6f410281971b3fc53b7777a40
VDF version:6.29.00.15

 General Method of propagation:
   • Email
   • Peer to Peer


Aliases:
   •  Symantec: W32/Zafi.d@MM
   •  Mcafee: W32/Zafi.d@MM
   •  Kaspersky: Email-Worm.Win32.Zafi.d
   •  Sophos: W32/Zafi-D
   •  Grisoft: I-Worm/Zafi.D
   •  Bitdefender: Win32.Zafi.D@mm


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003


Right after execution the following information is displayed:


 Files It copies itself to the following location:
   • %SYSDIR%\Norton Update.exe



The following files are created:

– A file that contains collected email addresses:
   • %SYSDIR%\%random%.dll

– C:\s.cm

 Registry The following registry key is added in order to run the process after reboot:

– HKLM\Software\Microsoft\Windows\CurrentVersion\Run
   • "Wxp4" = "%SYSDIR%\Norton Update.exe"



The following registry key is added:

– [HKLM\Software\Microsoft\Wxp4]
   • rD=dword:00000101
   • t1="%current username%"
   • t3="%SYSDIR%\Norton Update.exe"
   • t4="%SYSDIR%\%random character string%.dll"
   • lA="%PROGRAM FILES%\MSN\MSNCoreFiles"

 Email It contains an integrated SMTP engine in order to send emails. A direct connection with the destination server will be established. The characteristics are described in the following:
The language in which the email is sent out depends on the Top-Level-Domain.


From:
The sender address is spoofed.


To:
– Email addresses found in specific files on the system.
– Email addresses gathered from WAB (Windows Address Book)
– Generated addresses


Subject:
One of the following:
   • Christmas - Kartki!
   • Christmas Vykort!
   • Christmas Kort!
   • Christmas Postkort!
   • Christmas postikorti!
   • Christmas Atviruka!
   • Weihnachten card.
   • Prettige Kerstdagen!
   • Christmas pohlednice
   • Fw: ecard.ru
   • Fw: Merry Christmas!
   • Merry Christmas!
   • Re: Merry Christmas!
   • Weihnachten card.
   • Joyeux Noel!
   • Buon Natale!



Body:
– Contains HTML code.


Attachment:
The filenames of the attachments is constructed out of the following:

   • kartki
   • link
   • postcard
   • weihnachten
   • vykort
   • postkort
   • postikorti
   • atviruka
   • kerstdagen
   • pohlednice
   • ecarte
   • cartoline
   • navidad

   • christmas
   • card
   • postcard
   • index
   • kartki
   • link
   • postcard
   • weihnachten
   • vykort
   • postkort
   • postikorti
   • atviruka
   • kerstdagen
   • pohlednice
   • ecarte
   • cartoline
   • navidad

    Sometimes continued by one of the following:
   • christmas
   • index

    Continued by one of the following fake extensions:
   • gif%four-digit random character string%
   • jpg%four-digit random character string%
   • php%four-digit random character string%

    The file extension is one of the following:
   • zip
   • cmd
   • bat
   • pif



Here are a few examples of how the filename of the attachment might look like:
   • postcard.christmas.jpg7230.cmd
   • vykort.index.jpg8253.zip
   • weihnachten.christmas.php3720.pif

The attachment is an archive containing a copy of the malware itself.



The email looks like the following:


 Mailing Search addresses:
It searches the following files for email addresses:
   • htm; wab; txt; dbx; tbb; asp; php; sht; adb; mbx; eml; pmr; fpt; inb
It uses the same domain list as mentioned above.

The domain is one of the following:
   • .hu; .sp; .ru; .dk; .ro; .se; .no; .fi; .lt; .pl; .pt; .de; .nl; .cz;
      .fr; .it; .mx; .at; .es


Avoid addresses:
It does not send emails to addresses containing one of the following strings:
   • yaho; google; win; use; info; help; admi; webm; micro; msn; hotm;
      suppor; syman; viru; trend; secur; panda; cafee; sopho; kasper;

 P2P In order to infect other systems in the Peer to Peer network community the following action is performed:  


–   It searches for directories that contain one of the following substrings:
   • share
   • upload
   • music

   If successful, the following files are created:
   • winamp 5.7 new!.exe
   • ICQ 2005a new!.exe

   These files are copies of the malware itself.

 Process termination Processes with one of the following strings are terminated:
   • firewall
   • virus
   • reged
   • msconfig
   • task


 Backdoor The following port is opened:
on TCP port 8181 in order to provide backdoor capabilities.

 Miscellaneous Mutex:
It creates the following Mutex:
   • Wxp4

 File details Programming language:
 The malware program was written in MS Visual C++.


Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with the following runtime packer:
   • FSG 2.0

Description inserted by Ernest Szocs on Friday, October 26, 2007
Description updated by Ernest Szocs on Friday, October 26, 2007

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