Worm/Wootbot.117152 - Worm

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Summary

Full description

Statistics

Virus:	Worm/Wootbot.117152
Date discovered:	01/03/2006
Type:	Worm
In the wild:	No
Reported Infections:	Low
Distribution Potential:	Medium to high
Damage Potential:	Medium
Static file:	Yes
File size:	117.152 Bytes
MD5 checksum:	0e0261b06ec8d8aa1cb5ba6b986eb6fa
VDF version:	6.33.01.05 - Sat, 18 Feb 2006 14:34 (GMT+1)

General Methods of propagation:
   • Email
   • Local network

Aliases:
   • Symantec: W32.Mytob@mm
   • Kaspersky: Backdoor.Win32.Wootbot.gen
   • TrendMicro: WORM_MYTOB.OP
   • Bitdefender: Win32.Worm.Mytob.X.Gen

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

Side effects:
   • Uses its own Email engine
   • Registry modification
   • Makes use of software vulnerability
   • Steals information
   • Third party control

Files It copies itself to the following location:
• %SYSDIR%\WinApp32.exe

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

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "Windows Application 32"="WinApp32.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce]
   • "Windows Application 32"="WinApp32.exe"

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Windows Application 32"="WinApp32.exe"

– [HKCU\Software\Microsoft\Windows\CurrentVersion\RunOnce]
   • "Windows Application 32"="WinApp32.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices]
   • "Windows Application 32"="WinApp32.exe"

The following registry keys are added in order to load the services after reboot:

– [HKLM\SYSTEM\CurrentControlSet\Services\shit\Security]
   • "Security"=hex:%hex values%

– [HKLM\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_SHIT]
   • "NextInstance"=dword:00000001

– [HKLM\SYSTEM\CurrentControlSet\Services\shit\Enum]
   • "0"="Root\\LEGACY_SHIT\\0000"
     "Count"=dword:00000001
     "NextInstance"=dword:00000001

– [HKLM\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_SHIT\0000]
   • "Service"="shit"
     "Legacy"=dword:00000001
     "ConfigFlags"=dword:00000000
     "Class"="LegacyDriver"
     "ClassGUID"="{8ECC055D-047F-11D1-A537-0000F8753ED1}"
     "DeviceDesc"="Windows Application 32"

– [HKLM\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_SHIT\0000\Control]
   • "*NewlyCreated*"=dword:00000000
     "ActiveService"="shit"

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:

From:
Generated addresses. Please do not assume that it was the sender's intention to send this email to you. He might not know about his infection or might not even be infected at all. Furthermore it is possible that you will receive bounced emails telling you that you are infected. This might also not be the case.

To:
– Email addresses found in specific files on the system.
– Generated addresses

Subject:
One of the following:
   • Your Account is Suspended
   • *WARNING* Your email account is suspended
   • *DETECTED* Online User Violation
   • Your Account is Suspended For Security Reasons
   • Warning Message: Your services near to be closed.
   • Important Notification
   • Members Support
   • We have suspended your account
   • You are banned!!!
   • Security measures
   • Email Account Suspension
   • Notice of account limitation

Furthermore the subject line could contain random letters.

Body:
The body of the email is one of the following:

   • Some information about your %receiver's domain name from email address% account is attached.

     The %receiver's domain name from email address% Support Team

   • Dear %domain% Member,

     We have temporarily suspended your email account %domain%.

     This might be due to either of the following reasons:

     1. A recent change in your personal information (i.e. change of address).
     2. Submiting invalid information during the initial sign up process.
     3. An innability to accurately verify your selected option of subscription due to an internal error within our processors.
     See the attached details to reactivate your %receiver's domain name from email address% account.

     Sincerely,The %receiver's domain name from email address% Support Team

   • Dear %receiver's domain name from email address% Member,

     Your e-mail account was used to send a huge amount of unsolicited spam messages during the recent week. If you could please take 5-10 minutes out of your online experience and confirm the attached document so you will not run into any future problems with the online service.

     Virtually yours,
     The %receiver's domain name from email address% Support Team

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

– It starts with one of the following:
   • account-details
   • account-info
   • account-report
   • document
   • email-details
   • important-details
   • information
   • readme
   • %random character string%

    The file extension is one of the following:
   • zip

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:
   • txt; htm; sht; jsp; cgi; xml; php; asp; dbx; tbb; adb; html; wab

Address generation for FROM field:
To generate addresses it uses the following strings:
   • support
   • administrator
   • accounts
   • mail
   • service
   • admin
   • info
   • register
   • webmaster

It combines the result with domains that were found in files, which were previously searched for addresses.

Address generation for TO field:
To generate addresses it uses the following strings:
   • adam; alex; andrew; anna; bill; bob; bob; brenda; brent; brian;
      claudia; dan; dave; david; debby; frank; fred; george; helen; jack;
      james; jane; jerry; jim; jimmy; joe; john; jose; josh; julie; kevin;
      leo; linda; maria; mary; matt; michael; michael; mike; paul; peter;
      ray; robert; sales; sam; sandra; serg; smith; stan; steve; ted; tom

It combines the result with domains that were found in files, which were previously searched for addresses.

Avoid addresses:
It does not send emails to addresses containing one of the following strings:
   • -._!; -._!@; .edu; .gov; .mil; abuse; accoun; acketst; admin; anyone;
      arin.; avp; be_loyal:; berkeley; borlan; bsd; bugs; certific; contact;
      example; fcnz; feste; fido; foo.; fsf.; gnu; gold-certs; google; gov.;
      help; hotmail; iana; ibm.com; icrosof; icrosoft; ietf; info; inpris;
      isc.o; isi.e; kernel; linux; listserv; math; mit.e; mozilla; msn.;
      mydomai; nobody; nodomai; noone; not; nothing; ntivi; page; panda;
      pgp; postmaster; privacy; rating; rfc-ed; ripe.; root; ruslis;
      samples; secur; sendmail; service; site; soft; somebody; someone;
      sopho; spm; submit; support; syma; tanford.e; the.bat; unix; usenet;
      utgers.ed; webmaster; www; you; your

Prepend MX strings:
In order to get the IP address of the mail server it has the ability to prepend the following strings to the domain name:
   • mx.
   • mail.
   • smtp.
   • mx1.
   • mxs.
   • mail1.
   • relay.
   • ns.
   • gate.

Network Infection In order to ensure its propagation the malware attemps to connect to other machines as described below.

It drops a copy of itself to the following network share:
• IPC$

Exploit:
It makes use of the following Exploits:
– MS04-007 (ASN.1 Vulnerability)
– MS04-011 (LSASS Vulnerability)

Infection process:
Creates an FTP script on the compromised machine in order to download the malware to the remote location.

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

Server: 64.125.**********
Port: 6667
Channel: #exp

– This malware has the ability to collect and send information such as:
    • CPU speed
    • Current user
    • Malware uptime
    • Information about the network
    • Size of memory
    • Information about the Windows operating system

– Furthermore it has the ability to perform actions such as:
    • Launch DDoS ICMP flood
    • Download file
    • Open remote shell
    • Perform network scan
    • Perform port redirection
    • Restart system
    • Send emails
    • Shut down system
    • Start spreading routine

Backdoor – WinApp32.exe on a random TCP port in order to provide an FTP server.

Stealing It tries to steal the following information:

– It uses a network sniffer that checks for the following strings:
   • :.login; :!login; :!Login; :.Login; :.ident; :!ident; :.ipscan;
      :.advscan; :!advscan; :.secure; OPER; NICK; oper; USER; PASS; paypal;
      PAYPAL; passwd=; password=; login=; pass=; VISA=; mastercard=; visa=;
      amex=; ccnumber=; cctype=; card=; cvv2=; ccv2=; card=; CVV2=;
      address=; exp=; email=; account=; PAYPAL.COM; paypal.com

Miscellaneous Network shares:
The following network shares will be deleted:
   • c$
   • d$
   • ipc$
   • admin$

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

See a brief description here.

Description inserted by Iulia Diaconescu on Wed, 01 Mar 2006 17:40 (GMT+1)
Description updated by Iulia Diaconescu on Thu, 02 Mar 2006 13:24 (GMT+1)

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