W32/Mytob-HM is a mass-mailing worm and backdoor Trojan that can be controlled through the Internet Relay Chat (IRC) network.
W32/Mytob-HM is capable of spreading through email and through various operating system vulnerabilities such as LSASS (MS04-011). Emails sent by W32/Mytob-HM have the following properties:
Subject line:
document
Good day
Hello
Mail Delivery System
Mail Transaction Failed
message
readme
Server Report
Status
Message text:
'This is a multi-part message in MIME format.'
'Mail transaction failed. Partial message is available.'
'The message contains Unicode characters and has been sent as a binary attachment.'
'The message cannot be represented in 7-bit ASCII encoding and has been sent as a binary attachment.'
'The original message was included as an attachment.'
'Here are your banks documents.'
The attached file consists of a base name followed by the extensions 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 PIF, SCR, EXE or ZIP.
Sophos's anti-virus products include Genotype ™ detection technology, which can proactively protect against new threats without requiring an update. Sophos customers have been protected against W32/Mytob-HM (detected as W32/Mytob-Fam) since version 3.94.
W32/Mytob-HM is a mass-mailing worm and backdoor Trojan that can be controlled through the Internet Relay Chat (IRC) network.
When first run W32/Mytob-HM copies itself to the Windows system folder as yahooicons.exe and creates the following registry entries:
HKCU\System\CurrentControlSet\Control\Lsa
WINTASK
"yahooicons.exe"
HKCU\Software\Microsoft\OLE
WINTASK
"yahooicons.exe"
HKCU\Software\Microsoft\Windows\CurrentVersion\Run
WINTASK
"yahooicons.exe"
HKLM\System\CurrentControlSet\Control\Lsa
WINTASK
"yahooicons.exe"
HKLM\Software\Microsoft\Ole
WINTASK
"yahooicons.exe"
HKLM\Software\Microsoft\Windows\CurrentVersion\Run
WINTASK
"yahooicons.exe"
HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
WINTASK
"yahooicons.exe"
W32/Mytob-HM copies itself to the root folder as:
funny_pic.scr
my_photo2005.scr
see_this!!.scr
and drops a file called hellmsn.exe (detected by Sophos as W32/Mytob-D) in the same location. This component attempts to spread the worm by sending the aforementioned SCR files through Windows Messenger to all online contacts.
W32/Mytob-HM also appends the following to the HOSTS file to deny access to security related websites:
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 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 www.microsoft.com
127.0.0.1 www.trendmicro.com
W32/Mytob-HM is capable of spreading through email and through various operating system vulnerabilities such as LSASS (MS04-011). Emails sent by W32/Mytob-HM have the following properties:
Subject line:
document
Good day
Hello
Mail Delivery System
Mail Transaction Failed
message
readme
Server Report
Status
Message text:
'This is a multi-part message in MIME format.'
'Mail transaction failed. Partial message is available.'
'The message contains Unicode characters and has been sent as a binary attachment.'
'The message cannot be represented in 7-bit ASCII encoding and has been sent as a binary attachment.'
'The original message was included as an attachment.'
'Here are your banks documents.'
The attached file consists of a base name followed by the extensions 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 PIF, SCR, EXE or ZIP.
W32/Mytob-HM harvests email addresses from files on the infected computer and from the Windows Address Book. The worm avoids sending emails 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
Sophos's anti-virus products include Genotype ™ detection technology, which can proactively protect against new threats without requiring an update. Sophos customers have been protected against W32/Mytob-HM (detected as W32/Mytob-Fam) since version 3.94.