high
Summary
Summary
Action- More Information
| How it spreads |
|
|---|---|
| Affected operating systems | Windows |
| Protection available since | 4 November 2005 04:36:46 (GMT) |
| Last updated | 9 November 2005 01:23:07 (GMT) |
| Detected by | All Sophos products |
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Action
- Summary
- Action
- More Information
Please follow the instructions for removing worms.
Replace the Hosts file from a backup or edit it in Notepad to remove the changes that the worm has made.
You will also need to edit the following registry entries, if they are present. Please read the warning about editing the registry.
At the taskbar, click Start|Run. Type 'Regedit' and press Return. The registry editor opens.
Before you edit the registry, you should make a backup. On the 'Registry' menu, click 'Export Registry File'. In the 'Export range' panel, click 'All', then save your registry as Backup.
Locate the HKEY_LOCAL_MACHINE entries:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run
HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
and remove any reference to any file you deleted.
Close the registry editor.
More Information
W32/Mytob-FI is a mass-mailing worm and backdoor Trojan that can be controlled through the Internet Relay Chat (IRC) network.
W32/Mytob-FI spreads through email. W32/Mytob-FI harvests email addresses from files on the infected computer and from the Windows address book. Email sent by W32/Mytob-FI has the following properties:
Subject line:
Your password has been updated
Your password has been successfully updated
You have successfully updated your passworq
Your new account password is approved
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
Message text:
Dear user <str>,
You have successfully updated the password of your <str> account.
If you did not authorize this change or if you need assistance with your account, please contact <str> customer service at: <str>
Thank you for using <str>!
The <str> Support Team
+++ Attachment: No Virus (Clean)
+++ <str> Antivirus - www.<str>
Dear user <str>,
It has come to our attention that your <str> User Profile ( x ) records are out of date. For further details see the attached document.
Thank you for using <str>!
The <str> Support Team
+++ Attachment: No Virus (Clean)
+++ <str> Antivirus - www.<str>
Dear <str> Member,
We have temporarily suspended your email account <str>.
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 details to reactivate your <str> account.
Sincerely,The <str> Support Team
+++ Attachment: No Virus (Clean)
+++ <str> Antivirus - www.<str>
Dear <str> 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.
If you choose to ignore our request, you leave us no choice but to cancel your membership.
Virtually yours,
The <str> Support Team
+++ Attachment: No Virus found
+++ <str> Antivirus - www.<str>
In the above body text <str> would be replaced with either the domain or username from user's email address.
The attached file consists of a base name followed by the extensions CMD, PIF, SCR, EXE or ZIP. The worm may optionally create double extensions where the first extension is DOC, TXT or HTM and the final extension is BAT, CMD, PIF, SCR, EXE or ZIP. The base filenames are randomly chosen from:
updated-password
email-password
new-password
password
approved-password
account-password
accepted-password
important-details
account-details
email-details
account-info
document
readme
account-report
W32/Mytob-FI is a mass-mailing worm and backdoor Trojan that can be controlled through the Internet Relay Chat (IRC) network.
W32/Mytob-FI runs continuously in the background, providing a backdoor server which allows a remote intruder to gain access and control over the computer via IRC channels.
When first run W32/Mytob-FI copies itself to <System>\expI0rer.exe.
The following registry entries are created to run expI0rer.exe on startup:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
WINDOWS SYSTEM
expI0rer.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
WINDOWS SYSTEM
expI0rer.exe
W32/Mytob-FI sets the following registry entries, disabling the automatic startup of other software:
HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess
Start
4
Note: disabling autostart for the SharedAccess service deactivates the Microsoft Internet Connection Firewall (ICF).
W32/Mytob-FI spreads through email. W32/Mytob-FI harvests email addresses from files on the infected computer and from the Windows address book. Email sent by W32/Mytob-FI has the following properties:
Subject line:
Your password has been updated
Your password has been successfully updated
You have successfully updated your passworq
Your new account password is approved
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
Message text:
Dear user <str>,
You have successfully updated the password of your <str> account.
If you did not authorize this change or if you need assistance with your account, please contact <str> customer service at: <str>
Thank you for using <str>!
The <str> Support Team
+++ Attachment: No Virus (Clean)
+++ <str> Antivirus - www.<str>
Dear user <str>,
It has come to our attention that your <str> User Profile ( x ) records are out of date. For further details see the attached document.
Thank you for using <str>!
The <str> Support Team
+++ Attachment: No Virus (Clean)
+++ <str> Antivirus - www.<str>
Dear <str> Member,
We have temporarily suspended your email account <str>.
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 details to reactivate your <str> account.
Sincerely,The <str> Support Team
+++ Attachment: No Virus (Clean)
+++ <str> Antivirus - www.<str>
Dear <str> 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.
If you choose to ignore our request, you leave us no choice but to cancel your membership.
Virtually yours,
The <str> Support Team
+++ Attachment: No Virus found
+++ <str> Antivirus - www.<str>
In the above body text <str> would be replaced with either the domain or username from user's email address.
The attached file consists of a base name followed by the extensions CMD, PIF, SCR, EXE or ZIP. The worm may optionally create double extensions where the first extension is DOC, TXT or HTM and the final extension is BAT, CMD, PIF, SCR, EXE or ZIP. The base filenames are randomly chosen from:
updated-password
email-password
new-password
password
approved-password
account-password
accepted-password
important-details
account-details
email-details
account-info
document
readme
account-report
The worm avoids sending email to addresses that contain the following:
.gov
.mil
accoun
acketst
admin
anyone
arin.
avp
berkeley
borlan
bsd
bsd
bugs
ca
certific
contact
example
feste
fido
foo.
fsf.
gnu
gold-certs
google
google
gov.
help
iana
ibm.com
icrosof
icrosoft
ietf
info
inpris
isc.o
isi.e
kernel
linux
linux
listserv
math
me
mit.e
mozilla
mydomai
no
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
submit
support
syma
tanford.e
the.bat
unix
unix
usenet
utgers.ed
webmaster
you
your
W32/Mytob-FI modifies the HOSTS file, changing the URL-to-IP mappings for selected websites, therefore preventing normal access to these sites:
127.0.0.1 www.symantec.com
127.0.0.1 securityresponse.symantec.com
127.0.0.1 symantec.com
127.0.0.1 www.sophos.com
127.0.0.1 sophos.com
127.0.0.1 www.mcafee.com
127.0.0.1 mcafee.com
127.0.0.1 liveupdate.symantecliveupdate.com
127.0.0.1 www.viruslist.com
127.0.0.1 viruslist.com
127.0.0.1 viruslist.com
127.0.0.1 f-secure.com
127.0.0.1 www.f-secure.com
127.0.0.1 kaspersky.com
127.0.0.1 kaspersky-labs.com
127.0.0.1 www.avp.com
127.0.0.1 www.kaspersky.com
127.0.0.1 avp.com
127.0.0.1 www.networkassociates.com
127.0.0.1 networkassociates.com
127.0.0.1 www.ca.com
127.0.0.1 ca.com
127.0.0.1 mast.mcafee.com
127.0.0.1 my-etrust.com
127.0.0.1 www.my-etrust.com
127.0.0.1 download.mcafee.com
127.0.0.1 dispatch.mcafee.com
127.0.0.1 secure.nai.com
127.0.0.1 nai.com
127.0.0.1 www.nai.com
127.0.0.1 update.symantec.com
127.0.0.1 updates.symantec.com
127.0.0.1 us.mcafee.com
127.0.0.1 liveupdate.symantec.com
127.0.0.1 customer.symantec.com
127.0.0.1 rads.mcafee.com
127.0.0.1 trendmicro.com
127.0.0.1 pandasoftware.com
127.0.0.1 www.pandasoftware.com
127.0.0.1 www.trendmicro.com
127.0.0.1 www.grisoft.com
127.0.0.1 www.microsoft.com
127.0.0.1 microsoft.com
127.0.0.1 www.virustotal.com
127.0.0.1 virustotal.com
127.0.0.1 www.amazon.com
127.0.0.1 www.amazon.co.uk
127.0.0.1 www.amazon.ca
127.0.0.1 www.amazon.fr
127.0.0.1 www.paypal.com
127.0.0.1 paypal.com
127.0.0.1 moneybookers.com
127.0.0.1 www.moneybookers.com
127.0.0.1 www.ebay.com
127.0.0.1 ebay.com
W32/Mytob-FI may also terminate applications and security-related processes.
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