SANS Zotob Update

The SANS - Internet Storm Center has updated information on Zotob.

CAUTION: We do observe a large variety of Bots taking advantage of MS05-039. Not all of them are characterized as Zotob, and some may escape AV detection all together. Do not assume that you are "safe" if you don't find Zotob, but if you are vulnerable to the PNP exploit. Some of the other bots match generic SDBot or RBot signatures.

Zotob.A

Executable size: 22,528 bytes
Executable Name: botzor.exe
Ports: TCP – 445,8080,33333

Aliases: Zotob.A [F-Secure], W32/Zotob.worm [McAfee], W32/Zotob-A [Sophos], WORM_ZOTOB.A [Trend] Other details – Opens FTP server on port 33333, copies 2pac.txt and haha.exe to the system directory, adds itself to the run and run services in the registry. Modifies the hosts file to prevent updating of antivirus and security programs from updating.

Zotob.B
Executable size: 27,648 bytes
Executable Name: csm.exe
Ports: TCP – 445,8080,33333

Aliases: Zotob.B [F-Secure] W32/Zotob.worm.b [McAfee] W32/Zotob-B [Sophos] WORM_ZOTOB.B [Trend Micro]

Other details – Opens FTP server on port 33333, copies 2pac.txt and haha.exe to the system directory, adds itself to the run and run services in the registry. Modifies the hosts file to prevent updating of antivirus and security programs from updating.

Zotob.C

Executable size: 41,984 bytes
Executable Name: per.exe
Ports: TCP – 445,8080,33333

Other details – Mass-mailing worm uses a predefined list of recipient names appending the domain names that it gathers from an infected computer. Contains its own SMTP engine to email to the addresses that it finds. Opens FTP server on port 33333, adds itself to the run and run services in the registry. Modifies the hosts file to prevent updating of antivirus and security programs from updating.

Zotob.D

Executable size: 51,326 bytes
Executable name: windrg32.exe
Ports: TCP – 6667,1117,445

Other details – Opens FTP server on port 11173, attempts to end a variety of processes , Modifies the registry and deletes a variety of registry entries, and deletes a variety of files from the system and program files directories, adds itself to the run and run services in the registry. Modifies the hosts file to prevent updating of antivirus and security programs from updating.

Zotob.E

Executable size: 10,366 bytes
Executable Name: wintbp.exe
Ports: TCP – 8594,8080,445, UDP - 69
Aliases: WORM_RBOT.CBQ [Trend Micro]

Other details – Opens TFTP server on port UDP 69, Connects to IRC server at 72.20.27.115 on TCP port 8080 to listen for update instructions, adds itself to the run in the registry.

Zotob.F

Executable size: 10,878 bytes
Executable name: wintbpx.exe Portls: TCP –445

Other details – Opens multiple TCP ports. Connects to IRC server at 72.20.41.139 to listen for update instructions, adds itself to the run in the registry, creates a file named %Temp%\[NUMBER] which if successful contains TFTP scripts to download additional files.

Zotob.G

Executable size: 73,728 bytes
Executable name: windrg32.exe
Ports: TCP –445,6667,1171
Aliases: W32.Drudebot.A Other details – Attempts to connect IRC servers on port 6667, Opens a TFTP server on port 1171, attempts to end a variety of processes , Modifies the registry and deletes a variety of registry entries, and deletes a variety of files from the system and program files directories, adds itself to the run and run services in the registry, creates a file named %Temp%\[NUMBER] which if successful contains TFTP scripts to download additional files. Modifies the hosts file to prevent updating of antivirus and security programs from updating.