Worm/Zotob.A - Worm

See also

Summary

Full description

Statistics

Virus:	Worm/Zotob.A
Date discovered:	16/08/2005
Type:	Worm
In the wild:	Yes
Reported Infections:	Low
Distribution Potential:	Medium
Damage Potential:	Medium
Static file:	Yes
File size:	22.528 Bytes
MD5 checksum:	5C223D76A89AF8303777CD4C434F8707
VDF version:	6.31.1.108

General Method of propagation:
   • Local network

Aliases:
   • Symantec: W32.Zotob.A
   • Mcafee: W32/Zotob.worm.gen
   • Kaspersky: Net-Worm.Win32.Mytob.cd
   • TrendMicro: WORM_ZOTOB.A
   • F-Secure: Zotob.A
   • Sophos: W32/Zotob-A
   • Panda: W32/Zotob.A.worm

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

Side effects:
   • Blocks access to certain websites
   • Blocks access to security websites
   • Registry modification
   • Makes use of software vulnerability

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

It overwrites a file.
– %SYSDIR%\drivers\etc\hosts

Registry The following registry keys are added in order to run the processes after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "WINDOWS SYSTEM"="botzor.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices]
   • "WINDOWS SYSTEM"="botzor.exe"

The following registry key is changed:

– [HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess]
   Old value:
   • "Start"=%user defined settings%
   New value:
   • "Start"=dword:00000004

Network Infection Exploit:
It makes use of the following Exploit:
– MS05-039 (Vulnerability in Plug and Play)

IP address generation:
It creates random IP addresses while it keeps the first two octets from its own address. Afterwards it tries to establish a connection with the created addresses.

Infection process:
Creates an FTP script on the compromised machine in order to download the malware to the remote location.
The downloaded file is stored on the compromised machine as: %SYSDIR%\haha.exe

IRC To deliver system information and to provide remote control it connects to the following IRC Server:

Server: diabl0.tu**********ders.net
Port: 8080
Channel: #botzor elite
Nickname: [BOT]%six-digit random character string%

Hosts The host file is modified as explained:

– In this case existing entries are deleted.

– Access to the following domains is effectively blocked:
   • www.symantec.com; securityresponse.symantec.com; symantec.com;
      www.sophos.com; sophos.com; www.mcafee.com; mcafee.com;
      liveupdate.symantecliveupdate.com; www.viruslist.com; viruslist.com;
      viruslist.com; f-secure.com; www.f-secure.com; kaspersky.com;
      kaspersky-labs.com; www.avp.com; www.kaspersky.com; avp.com;
      www.networkassociates.com; networkassociates.com; www.ca.com; ca.com;
      mast.mcafee.com; my-etrust.com; www.my-etrust.com;
      download.mcafee.com; dispatch.mcafee.com; secure.nai.com; nai.com;
      www.nai.com; update.symantec.com; updates.symantec.com; us.mcafee.com;
      liveupdate.symantec.com; customer.symantec.com; rads.mcafee.com;
      trendmicro.com; pandasoftware.com; www.pandasoftware.com;
      www.trendmicro.com; www.grisoft.com; www.microsoft.com; microsoft.com;
      www.virustotal.com; virustotal.com; www.amazon.com; www.amazon.co.uk;
      www.amazon.ca; www.amazon.fr; www.paypal.com; paypal.com;
      moneybookers.com; www.moneybookers.com; www.ebay.com; ebay.com

Backdoor The following ports are opened:

– %executed file% on TCP port 33333 in order to provide an FTP server.
– %executed file% on a random TCP port
– %executed file% on TCP port 8888 in order to provide a remote Shell.

Miscellaneous Mutex:
It creates the following Mutex:
   • B-O-T-Z-O-R

String:
Furthermore it contains the following strings:
   • Botzor2005 Made By .... Greetz to good friend Coder. Based On HellBot3
   • MSG to avs: the first av who detect this worm will be the first killed in the next 24hours!!!

See a brief description here.

Description inserted by Dragos Tomescu on Tue, 16 Aug 2005 15:29 (GMT+1)
Description updated by Dragos Tomescu on Tue, 30 Aug 2005 11:24 (GMT+1)

» About Malware
» About Phishing
» Viruses In the Wild

« back