Summary
A new variant of MyDoom worm - Mydoom.AF, was found on October 27th, 2004. The worm is similar to previous variants.Note: Mydoom.AG was renamed to Mydoom.AF on 9th of November, 2004.
Removal
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
Check for the latest database updates
First, check if your F-Secure security program is using the latest updates, then try scanning the file again.
Submit a sample
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note: You need administrative rights to change the settings.
Technical Details
The worm is a PE executable file 31744 bytes long packed with UPX file compressor. The unpacked file's size is 73728 bytes.
Installation to system
Upon installation the worm copies itself as 'lsasrv.exe' file to Windows System Directory and creates a startup key for that file in System Registry:
- [HKLM\Software\Microsoft\Windows\CurrentVersion\Run] "lsass" = "%WinSysDir%\lsasrv.exe"
where "%WinSysDir%" represents Windows System directory. If the startup key cal not be created in HKLM (local machine) Registry tree, it is created in HKCU (current user) tree.
Spreading in emails
The worm spreads by sending its infected attachment to all email addresses found on an infected computer. The worm looks for email addresses in Windows Address Book and in the files with the following extensions:
- wab
- pl
- adb
- tbb
- dbx
- asp
- php
- sht
- vbs
- cfg
- eml
- cgi
- wsh
- msg
- uin
- xls
- jsp
- xml
- mdx
- mbx
- html
- htm
- txt
The worm avoids sending emails to email addresses that contain any of the following substrings:
- avp
- syma
- icrosof
- msn.
- hotmail
- panda
- sopho
- borlan
- inpris
- example
- mydomai
- nodomai
- ruslis
- .gov
- gov.
- .mil
- foo.
- berkeley
- unix
- math
- bsd
- mit.e
- gnu
- fsf.
- ibm.com
- kernel
- linux
- fido
- usenet
- iana
- ietf
- rfc-ed
- sendmail
- arin.
- ripe.
- isi.e
- isc.o
- acketst
- pgp
- tanford.e
- utgers.ed
- mozilla
- root
- info
- samples
- postmaster
- webmaster
- noone
- nobody
- nothing
- anyone
- someone
- your
- you
- me
- bugs
- rating
- site
- contact
- soft
- no
- somebody
- privacy
- service
- help
- not
- submit
- feste
- ca
- gold-certs
- the.bat
- page
- admin
- icrosoft
- support
- ntivi
- unix
- bsd
- linux
- listserv
- certific
- accoun
Payload
The worm modifies the HOSTS file to block access to the following websites:
- 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
- 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
- www.trendmicro.com
- www.grisoft.com
- grisoft.com
Protect your devices from malware with F‑Secure Total
Protecting your devices from malicious software is essential for maintaining online security. F‑Secure Total makes this easy, helping you to secure your devices in a brilliantly simple way.
Award‑winning antivirus and malware protection
Online browsing, banking, and shopping protection
24/7 online identity and data breach monitoring
Unlimited VPN service to safeguard your privacy
Password manager with private data protection
Choose how many devices you want to protect to get started.
Free customer support
Cancel anytime
The trial does not obligate you to buy the product
After 30 days your subscription will renew automatically for one year at €69.99.
)
)
More Support
Community
Ask questions in our Community.
User guides
Check the user guide for instructions.
Contact Support
Chat with with or call an agent.
Submit a Sample
Submit a file or URL for analysis.