Worm/Agobot.97918 - Worm

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Summary

Full description

Statistics

Virus:	Worm/Agobot.97918
Date discovered:	29/08/2005
Type:	Worm
In the wild:	Yes
Reported Infections:	Medium
Distribution Potential:	Medium to high
Damage Potential:	Medium
Static file:	Yes
File size:	97.918 Bytes
MD5 checksum:	445882B3C915350B29735DF1C8169ECB
VDF version:	6.31.0.204

General Methods of propagation:
   • Email
   • Local network

Aliases:
   • Symantec: W32.Mytob.HL@mm
   • Kaspersky: Net-Worm.Win32.Mytob.bw
   • TrendMicro: WORM_MYTOB.IJ
   • F-Secure: W32/Mytob.IQ@mm
   • VirusBuster: I-Worm.Mytob.JF
   • Bitdefender: Backdoor.SDBot.E0549F1E

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
   • Records keystrokes
   • Registry modification
   • Makes use of software vulnerability
   • Steals information
   • Third party control

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

It deletes the initially executed copy of itself.

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

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "Win32 Driver"="svchosts.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce]
   • "Win32 Driver"="svchosts.exe"

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Win32 Driver"="svchosts.exe"

– [HKCU\Software\Microsoft\Windows\CurrentVersion\RunOnce]
   • "Win32 Driver"="svchosts.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices]
   • "Win32 Driver"="svchosts.exe"

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

– [HKLM\SYSTEM\CurrentControlSet\Services\shit]
   • "Type"=dword:00000020
   • "Start"=dword:00000004
   • "ErrorControl"=dword:00000001
   • "ImagePath"="%SYSDIR%\svchosts.exe" -netsvcs
   • "DisplayName"="Win32 Driver"
   • "ObjectName"="LocalSystem"
   • "FailureActions"=hex:ff,ff,ff,ff,00,00,00,00,00,00,00,00,01,00,00,00,69,00,76,\
   • 00,01,00,00,00,01,00,00,00
   • "DeleteFlag"=dword:00000001

The following registry keys are added:

– [HKLM\SYSTEM\CurrentControlSet\Services\shit\Security]
   • "Security"=hex:01,00,14,80,90,00,00,00,9c,00,00,00,14,00,00,00,30,00,00,00,02,\ 00,1c,00,01,00,00,00,02,80,14,00,ff,01,0f,00,01,01,00,00,00,00,00,01,00,00,\ 00,00,02,00,60,00,04,00,00,00,00,00,14,00,fd,01,02,00,01,01,00,00,00,00,00,\ 05,12,00,00,00,00,00,18,00,ff,01,0f,00,01,02,00,00,00,00,00,05,20,00,00,00,\ 20,02,00,00,00,00,14,00,8d,01,02,00,01,01,00,00,00,00,00,05,0b,00,00,00,00,\ 00,18,00,fd,01,02,00,01,02,00,00,00,00,00,05,20,00,00,00,23,02,00,00,01,01,\ 00,00,00,00,00,05,12,00,00,00,01,01,00,00,00,00,00,05,12,00,00,00

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

– [HKLM\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_SHIT]
   • "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"="Win32 Driver"

– [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:
   • *DETECTED* Online User Violation
   • *WARNING* YOUR EMAIL ACCOUNT IS SUSPENDED
   • Email Account Suspension
   • Important Notification
   • Members Support
   • NOTICE OF ACCOUNT LIMITATION
   • Security measures
   • Warning Message: Your services near to be closed.
   • We have suspended your account
   • You are banned!!!
   • Your Account is Suspended
   • YOUR ACCOUNT IS SUSPENDED FOR SECURITY REASONS

Furthermore the subject line could contain random letters.

Body:
– Contains HTML code.
The body of the email is one of the following:

   • Dear %recipients domain% Member,
     We have temporarily suspended your email account %email application account%.
     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 %recipients domain% account.
     Sincerely,The %recipients domain% Support Team

   • Dear %recipients domain% 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 %recipients domain% Support Team

   • Some information about your %recipients domain% account is attached.
     The %recipients domain% Support Team

Attachment:
The filename of the attachment is one of the following:
   • account-details.zip
   • account-info.zip
   • account-report.zip
   • document.zip
   • email-details.zip
   • important-details.zip
   • information.zip
   • readme.zip

The attachment is a copy of the malware itself.

The email may look like one of the following:

Mailing Search addresses:
It searches the following files for email addresses:
   • .wab; .html; .adb; .tbb; .dbx; .asp; .php; .xml; .cgi; .jsp; .sht;
      .htm

Address generation for FROM field:
To generate addresses it uses the following strings:
   • accounts
   • admin
   • administrator
   • info
   • mail
   • register
   • service
   • support
   • 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; 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; 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:
   • "accoun"; "certific"; "listserv"; "ntivi"; "support"; "icrosoft";
      "admin"; "page"; "the.bat"; "gold-certs"; "feste"; "submit"; "not";
      "help"; "service"; "privacy"; "somebody"; "soft"; "contact"; "site";
      "rating"; "bugs"; "you"; "your"; "someone"; "anyone"; "nothing";
      "nobody"; "noone"; "webmaster"; "postmaster"; "samples"; "info";
      "root"; "mozilla"; "utgers.ed"; "tanford.e"; "pgp"; "acketst";
      "secur"; "isc.o"; "isi.e"; "ripe."; "arin."; "sendmail"; "rfc-ed";
      "ietf"; "iana"; "usenet"; "fido"; "linux"; "kernel"; "google";
      "ibm.com"; "fsf."; "gnu"; "mit.e"; "bsd"; "math"; "unix"; "berkeley";
      "foo."; ".mil"; "gov."; ".gov"; "ruslis"; "nodomai"; "mydomai";
      "example"; "inpris"; "borlan"; "sopho"; "panda"; "hotmail"; "msn.";
      "icrosof"; "syma"; "avp"; ".edu"; "abuse"; "abuse"

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:
   • gate.
   • ns.
   • relay.
   • mail1.
   • mxs.
   • mx1.
   • smtp.
   • mail.
   • mx.

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

Exploit:
It makes use of the following Exploits:
– MS03-049 (Buffer Overrun in the Workstation Service)
– MS04-007 (ASN.1 Vulnerability)
– MS04-011 (LSASS Vulnerability)

IP address generation:
It creates random IP addresses while it keeps the first octet 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.

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

Server: time.sanalcheh**********.com
Port: 7745
Channel: #zebra
Nickname: akira-%random chracter string%

– This malware has the ability to collect and send information such as:
    • Cached passwords
    • CPU speed
    • Current user
    • Free disk space
    • Free memory
    • Malware uptime
    • Information about the network
    • Size of memory
    • Windows directory

– Furthermore it has the ability to perform actions such as:
    • Launch DDoS ICMP flood
    • Launch DDoS SYN flood
    • Launch DDoS TCP flood
    • Launch DDoS UDP flood
    • Disable network shares
    • Download file
    • Enable network shares
    • Execute file
    • Perform network scan
    • Perform port redirection
    • Restart system
    • Start spreading routine
    • Updates itself
    • Upload file

Backdoor The following port is opened:

– %SYSDIR%\svchosts.exe on a random TCP port in order to provide an FTP server.

Stealing It tries to steal the following information:

– A logging routine is started after keystrokes are typed that match one of the following strings:
   • paypal
   • PAYPAL

– It captures:
    • Keystrokes

– A logging routine is started after the following website is visited, which contains one of the following substrings in the URL:
   • paypal.com
   • PAYPAL.COM

– It captures:
    • Login information

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

Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with the following runtime packer:
• PE Pack 1.0

See a brief description here.

Description inserted by Andrei Gherman on Tue, 30 Aug 2005 09:12 (GMT+1)
Description updated by Andrei Gherman on Wed, 31 Aug 2005 10:33 (GMT+1)

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