Content
W32/Mytob.he@MM
- Type
- Virus
- SubType
- Discovery Date
- 11/24/2005
- Length
- 53,760 bytes
- Minimum DAT
- 4636 (11/24/2005)
- Updated DAT
- 4992 (03/26/2007)
- Minimum Engine
- 5.1.00
- Description Added
- 11/24/2005
- Description Modified
- 11/25/2005 1:24 AM (PT)
Tab Navigation
Characteristics
This detection is for a mass-mailing worm that combines W32/Mydoom@MM functionality with W32/Sdbot.worm functionality. Its behavior is largely similar to other W32/Mytob variants.
This variant installs a downloader component that is generically detected as Generic Downloader.j . This trojan may download and install other malware from:
- http://w0t.slo[hidden]tija.info
Mail Propagation
The virus arrives in an e-mail message as follows:
From: (Spoofed email sender - may be chosen from the following list)
The apparent sender address should not be assumed to be an indication of infection. Additionally, one may receive alert messages from a mail server warning of a hoax infection.
- support
- administrator
- service
- admin
- info
- register
- webmaster
Subject: (Varies, such as)
- Your 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
- Security measures
- Email Account Suspension
- Notice of account limitation
Body:
(Varies, such as)
| Dear user (name in To: address
) ,
You have successfully updated the password of your (first part of recipient domain name ) account. If you did not authorize this change or if you need assistance with your account, please contact (first part of recipient domain name ) customer service at: (From: address ) Thank you for using (first part of recipient domain name
) ! +++ Attachment: No Virus (Clean) |
| Dear user (name in To: address
) ,
It has come to our attention that your (first part of recipient domain name ) User Profile ( x ) records are out of date. For further details see the attached document. Thank you for using (first part of recipient domain name
) ! +++ Attachment: No Virus (Clean) |
| Dear (first part of recipient domain name
) Member,
We have temporarily suspended your email account (To: address ) . This might be due to either of the following reasons: 1. A recent change in your personal information (i.e. change of address). Sincerely,The (first part of recipient domain name ) Support Team +++ Attachment: No Virus (Clean) |
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.
If you choose to ignore our request, you leave us no choice but to cancel your membership.
Virtually yours, +++ Attachment: No Virus found Dear (first part of recipient domain name
) Member,
The (first part of recipient domain name
) Support Team
+++ (first part of recipient domain name
) Antivirus -
www.(Full
domain name
)
Attachment:
(Varies - contains one of these randomly picked strings)
- updated-password
- email-password
- new-password
- password
- approved-password
- account-password
- accepted-password
- account-details
- email-details
- account-info
- document
- readme
- account-report
Extensions: (Varies, chooses from the following list)
First extension:
- tmp
- doc
- htm
- txt
Final extension:
- pif
- scr
- exe
- cmd
- bat
Symptoms
Other than the common W32/Mytob.gen@MM symptoms, this variant will create the following Windows Registry keys:
- HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\ CurrentVersion\Run\Debugger = "\dbg32.exe"
- HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\ CurrentVersion\RunServices\Debugger = "\dbg32.exe"
And presence of the Generic Downloader.j trojan at the following path:
- %Windir%\System32\syst.exe
The Sdbot functionality in the worm is designed to contact the following IRC server, join a specified channel, and wait for further instructions:
- rax.ou[hidden]x.info (TCP Port 59999 )
Method of Infection
This virus propagates using an identical strategy as most other Mytob variants through harvesting e-mail addresses from selected files on the compromised system, and generating new e-mail addresses. Details of this behavior is depicted in the VIL description for W32/Mytob.gen@MM .
Removal
AVERT recommends to always use latest DATs and engine. This threat will be cleaned if you have this combination.
Variants
Variants
N/A
All Information
Overview -
This is a virus detection. Viruses are programs that self-replicate recursively, meaning that infected systems spread the virus to other systems, which then propagate the virus further. While many viruses contain a destructive payload, it's quite common for viruses to do nothing more than spread from one system to another.
Aliases
- Net-Worm.Win32.Mytob.do (AVP)
- W32/Mytob.PL@mm (F-Prot)
- WORM_MYTOB.MX (Trend)
Characteristics
Characteristics -
This detection is for a mass-mailing worm that combines W32/Mydoom@MM functionality with W32/Sdbot.worm functionality. Its behavior is largely similar to other W32/Mytob variants.
This variant installs a downloader component that is generically detected as Generic Downloader.j . This trojan may download and install other malware from:
- http://w0t.slo[hidden]tija.info
Mail Propagation
The virus arrives in an e-mail message as follows:
From: (Spoofed email sender - may be chosen from the following list)
The apparent sender address should not be assumed to be an indication of infection. Additionally, one may receive alert messages from a mail server warning of a hoax infection.
- support
- administrator
- service
- admin
- info
- register
- webmaster
Subject: (Varies, such as)
- Your 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
- Security measures
- Email Account Suspension
- Notice of account limitation
Body:
(Varies, such as)
| Dear user (name in To: address
) ,
You have successfully updated the password of your (first part of recipient domain name ) account. If you did not authorize this change or if you need assistance with your account, please contact (first part of recipient domain name ) customer service at: (From: address ) Thank you for using (first part of recipient domain name
) ! +++ Attachment: No Virus (Clean) |
| Dear user (name in To: address
) ,
It has come to our attention that your (first part of recipient domain name ) User Profile ( x ) records are out of date. For further details see the attached document. Thank you for using (first part of recipient domain name
) ! +++ Attachment: No Virus (Clean) |
| Dear (first part of recipient domain name
) Member,
We have temporarily suspended your email account (To: address ) . This might be due to either of the following reasons: 1. A recent change in your personal information (i.e. change of address). Sincerely,The (first part of recipient domain name ) Support Team +++ Attachment: No Virus (Clean) |
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.
If you choose to ignore our request, you leave us no choice but to cancel your membership.
Virtually yours, +++ Attachment: No Virus found Dear (first part of recipient domain name
) Member,
The (first part of recipient domain name
) Support Team
+++ (first part of recipient domain name
) Antivirus -
www.(Full
domain name
)
Attachment:
(Varies - contains one of these randomly picked strings)
- updated-password
- email-password
- new-password
- password
- approved-password
- account-password
- accepted-password
- account-details
- email-details
- account-info
- document
- readme
- account-report
Extensions: (Varies, chooses from the following list)
First extension:
- tmp
- doc
- htm
- txt
Final extension:
- pif
- scr
- exe
- cmd
- bat
Symptoms
Symptoms -
Other than the common W32/Mytob.gen@MM symptoms, this variant will create the following Windows Registry keys:
- HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\ CurrentVersion\Run\Debugger = "\dbg32.exe"
- HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\ CurrentVersion\RunServices\Debugger = "\dbg32.exe"
And presence of the Generic Downloader.j trojan at the following path:
- %Windir%\System32\syst.exe
The Sdbot functionality in the worm is designed to contact the following IRC server, join a specified channel, and wait for further instructions:
- rax.ou[hidden]x.info (TCP Port 59999 )
Method of Infection
Method of Infection -
This virus propagates using an identical strategy as most other Mytob variants through harvesting e-mail addresses from selected files on the compromised system, and generating new e-mail addresses. Details of this behavior is depicted in the VIL description for W32/Mytob.gen@MM .
Removal -
Removal -
AVERT recommends to always use latest DATs and engine. This threat will be cleaned if you have this combination.
Additional Windows ME/XP removal considerations
Variants
Variants -
N/A
