Alerts
Posted: Fri Jul 30, 2004 5:17 am
W32.Mydoom.N@mm
Discovered on: July 29, 2004
Last Updated on: July 30, 2004 12:19:14 PM
W32.Mydoom.N@mm is a variant of W32.Mydoom.M@mm. It also is a mass-mailing worm that drops and executes a backdoor detected as Backdoor.Zincite.A, which listens on TCP port 1034. The worm uses its own SMTP engine to send itself to email addresses it finds on the infected computer.
The email contains a spoofed From address, and the Subject and Body text will vary. The attachment name will also vary.
This threat is packed with ASPack.
Type: Worm
Infection Length: 35,328 bytes
Systems Affected: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP
Systems Not Affected: DOS, EPOC, Linux, Macintosh, Macintosh OS X, Novell Netware, OS/2, UNIX
Damage
Payload Trigger: n/a
Payload: n/a
Large scale e-mailing: Uses its own SMTP engine to send itself to the email addresses found in the files with certain extensions.
Deletes files: n/a
Modifies files: n/a
Degrades performance: Mass-mailing may clog mail servers or degrade network performance.
Causes system instability: n/a
Releases confidential info: n/a
Compromises security settings: The dropped Backdoor allows unauthorized remote access.
Distribution
Subject of email: Varies
Name of attachment: Varies with .cmd, .bat, .com, .exe, .pif, .scr, or .zip file extension.n/a
Size of attachment: Varies
Time stamp of attachment: n/a
Ports: TCP 1034
Shared drives: n/a
Target of infection: n/a
When W32.Mydoom.N@mm runs, it do the following,
Creates one of the following registry keys, which mark the computer as infected:
HKEY_LOCAL_MACHINE\Software\Microsoft\Daemon
HKEY_CURRENT_USER\Software\Microsoft\Daemon
Copies itself as %Windir%\java.exe.
Note: %Windir% is a variable. The worm locates the Windows installation folder (by default, this is C:\Windows or C:\Winnt) and copies itself to that location.
Drops and executes %Windir%\services.exe, which is detected as Backdoor.Zincite.A. When executed, this file opens TCP port 1034 and listens for remote connections. The backdoor will also probe random IP addresses on port 1034 looking for other infected hosts.
Adds the values:
"Services" = "%Windir%\services.exe"
"JavaVM" = "%Windir%\java.exe"
to one of the registry keys:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
so that the worm and backdoor load when Windows starts.
May create the following files for logging purposes:
%Temp%\zincite.log
%Temp%\<randomly named file>.log
Gathers email addresses from files with the following extensions:
.adb
.asp
.dbx
.ht*
.php
.pl
.sht
.tbb
.tx*
.wab
Queries the following search engines to harvest additional email addresses for possible distribution:
search.lycos.com
search.yahoo.com
www.altavista.com
www.google.com
When the worm finds an open Outlook window, it will attempt to send itself to the email addresses that it found.
The email has the following characteristics:
From:
The From address will be spoofed.
Subject: (One of the following)
hello
hi
error
status
test
report
delivery failed
Message could not be delivered
Mail System Error - Returned Mail
Delivery reports about your e-mail
Returned mail: see transcript for details
Returned mail: Data format error
Body:
The content contained in the body of the email will vary, based on a number of text options. One of each of the phrases or words in brackets, separated by a "|", will appear:
Dear user {<recipient's email address>|of <recipient's email domain>},{ {{M|m}ail {system|server} administrator|administration} of <recipient's email domain> would like to {inform you{ that{:|,}|}|let you know {that|the following}{.|:|,}}|||||}
{We have {detected|found|received reports} that y|Y}our {e{-|}mail |}account {has been|was} used to send a {large|huge} amount of {{unsolicited{ commercial|}|junk} e{-|}mail|spam}{ messages|} during {this|the {last|recent}} week.
{We suspect that|Probably,|Most likely|Obviously,} your computer {had been|was} {compromised|infected{ by a recent v{iru}s|}} and now {run|contain}s a {trojan{ed|}|hidden} proxy server.
{Please|We recommend {that you|you to}} follow {our |the |}instruction{s|} {in the {attachment|attached {text |}file} |}in order to keep your computer safe.
{{Virtually|Sincerely} yours|Best {wishe|regard}s|Have a nice day},
{<recipient's email domain> {user |technical |}support team.|The <recipient's email domain> {support |}team.}
{The|This|Your} message was{ undeliverable| not delivered} due to the following reason{(s)|}:
Your message {was not|could not be} delivered because the destination {computer|server} was
{not |un}reachable within the allowed queue period. The amount of time
a message is queued before it is returned depends on local configura-
tion parameters.
Most likely there is a network problem that prevented delivery, but
it is also possible that the computer is turned off, or does not
have a mail system running right now.
Your message {was not|could not be} delivered within <random number> days:
{{{Mail s|S}erver}|Host} <host used to send the email>} is not responding.
The following recipients {did|could} not receive this message:
<<recipient's email address>>
Please reply to postmaster@{<sender's email domain>|<recipient's email domain>}
if you feel this message to be in error.
The original message was received at [current time]{
| }from {<sender's email domain> ]|{<host used to send the email>]|]}}
----- The following addresses had permanent fatal errors -----
{<<recipient's email address>>|<recipient's email address>}
{----- Transcript of {the ||}session follows -----
... while talking to {host |{mail |}server ||||}{<recipient's email domain>.|<host used to send the email>]}:
{>>> MAIL F{rom|ROM}:[From address of mail]
<<< 50$d {[From address of mail]... |}{Refused|{Access d|D}enied|{User|Domain|Address} {unknown|blacklisted}}|554 <<recipient's email address>>... {Mail quota exceeded|Message is too
large}
554 <<recipient's email address>>... Service unavailable|550 5.1.2 <<recipient's email address>>... Host unknown (Name server: host not found)|554 {5.0.0 |}Service unavailable; ] blocked using {relays.osirusoft.com|bl.spamcop.net}{, reason: Blocked|}
Session aborted{, reason: lost connection|}|>>> RCPT To:<<recipient's email address>>
<<< 550 {MAILBOX NOT FOUND|5.1.1 <<recipient's email address>>... {User unknown|Invalid recipient|Not known here}}|>>> DATA
{<<< 400-aturner; %MAIL-E-OPENOUT, error opening !AS as output
|}{<<< 400-aturner; -RMS-E-CRE, ACP file create failed
|}{<<< 400-aturner; -SYSTEM-F-EXDISKQUOTA, disk quota exceeded
|}<<< 400}|}
The original message was included as attachment
{{The|Your} m|M}essage could not be delivered
Notes:
<recipient's email address> is the email address of the person receiving the email.
<recipient's email domain> is the domain of the receiver's email. For instance, if the email address is john_doe@example.com, the domain is "example.com."
<sender's email domain> is the domain of the sender's email. For instance, if the email address is john_doe@example.com, the domain is "example.com."
<host used to send the email> is name of the email server used by the infected computer. The worm gathers this information from the infected computer's registry.
Attachment:
The worm may generate an file name from a domain name of an email address gathered from the computer. For instance, if the worm finds an address john_doe@example.com on the infected computer, the attachment name could contain example.com.
The attachment name may also be one of the following:
readme
instruction
transcript
mail
letter
file
text
attachment
document
message
with one of the following extensions:
.cmd
.bat
.com
.exe
.pif
.scr
.zip
the attachment may have a second extension, which will be one of the following:
doc
txt
htm
html
Notes:
Approximately 30% of the time, the attachment will be zipped. In these cases the attachment may be compressed several times over.
There is a 15% chance the worm will attach a small junk file to the mail instead of a copy of itself.
The worm will not send itself to addresses that contain the following strings:
mailer-d
spam
abuse
master
sample
accou
privacycertific
bugs
listserv
submit
ntivi
support
admin
page
the.bat
gold-certs
feste
not
help
foo
soft
site
rating
you
your
someone
anyone
nothing
nobody
noone
info
winrar
winzip
rarsoft
sf.net
sourceforge
ripe.
arin.
google
gnu.
gmail
seclist
secur
bar.
foo.com
trend
update
uslis
domain
example
sophos
yahoo
spersk
panda
hotmail
msn.
msdn.
microsoft
sarc.
syma
avp
Removal Instructions:
Disable System Restore (Windows Me/XP).
Update the virus definitions.
Restart the computer in Safe mode or VGA mode.
Run a full system scan and delete all the files detected as W32.Mydoom.N@mm.
Reverse the changes made to the registry.
To reverse the changes made to the registry
Important: Symantec strongly recommends that you back up the registry before making any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify the specified keys only. Read the document, "How to make a backup of the Windows registry," for instructions.
Click Start > Run.
Type regedit
Then click OK.
Navigate to each of the following keys:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
In the right pane, delete the values if exist:
"Services" = "%Windir%\services.exe"
"JavaVM" = "%Windir%\java.exe"
Navigate to the keys:
HKEY_LOCAL_MACHINE\Software\Microsoft\Daemon
HKEY_CURRENT_USER\Software\Microsoft\Daemon
and delete them.
Exit the Registry Editor.
Restart the computer in Normal mode.
[url=\"http://securityresponse.symantec.com/avcenter/venc/data/w32.mydoom.n@mm.html\"]Symantec Source[/url]
Discovered on: July 29, 2004
Last Updated on: July 30, 2004 12:19:14 PM
W32.Mydoom.N@mm is a variant of W32.Mydoom.M@mm. It also is a mass-mailing worm that drops and executes a backdoor detected as Backdoor.Zincite.A, which listens on TCP port 1034. The worm uses its own SMTP engine to send itself to email addresses it finds on the infected computer.
The email contains a spoofed From address, and the Subject and Body text will vary. The attachment name will also vary.
This threat is packed with ASPack.
Type: Worm
Infection Length: 35,328 bytes
Systems Affected: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP
Systems Not Affected: DOS, EPOC, Linux, Macintosh, Macintosh OS X, Novell Netware, OS/2, UNIX
Damage
Payload Trigger: n/a
Payload: n/a
Large scale e-mailing: Uses its own SMTP engine to send itself to the email addresses found in the files with certain extensions.
Deletes files: n/a
Modifies files: n/a
Degrades performance: Mass-mailing may clog mail servers or degrade network performance.
Causes system instability: n/a
Releases confidential info: n/a
Compromises security settings: The dropped Backdoor allows unauthorized remote access.
Distribution
Subject of email: Varies
Name of attachment: Varies with .cmd, .bat, .com, .exe, .pif, .scr, or .zip file extension.n/a
Size of attachment: Varies
Time stamp of attachment: n/a
Ports: TCP 1034
Shared drives: n/a
Target of infection: n/a
When W32.Mydoom.N@mm runs, it do the following,
Creates one of the following registry keys, which mark the computer as infected:
HKEY_LOCAL_MACHINE\Software\Microsoft\Daemon
HKEY_CURRENT_USER\Software\Microsoft\Daemon
Copies itself as %Windir%\java.exe.
Note: %Windir% is a variable. The worm locates the Windows installation folder (by default, this is C:\Windows or C:\Winnt) and copies itself to that location.
Drops and executes %Windir%\services.exe, which is detected as Backdoor.Zincite.A. When executed, this file opens TCP port 1034 and listens for remote connections. The backdoor will also probe random IP addresses on port 1034 looking for other infected hosts.
Adds the values:
"Services" = "%Windir%\services.exe"
"JavaVM" = "%Windir%\java.exe"
to one of the registry keys:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
so that the worm and backdoor load when Windows starts.
May create the following files for logging purposes:
%Temp%\zincite.log
%Temp%\<randomly named file>.log
Gathers email addresses from files with the following extensions:
.adb
.asp
.dbx
.ht*
.php
.pl
.sht
.tbb
.tx*
.wab
Queries the following search engines to harvest additional email addresses for possible distribution:
search.lycos.com
search.yahoo.com
www.altavista.com
www.google.com
When the worm finds an open Outlook window, it will attempt to send itself to the email addresses that it found.
The email has the following characteristics:
From:
The From address will be spoofed.
Subject: (One of the following)
hello
hi
error
status
test
report
delivery failed
Message could not be delivered
Mail System Error - Returned Mail
Delivery reports about your e-mail
Returned mail: see transcript for details
Returned mail: Data format error
Body:
The content contained in the body of the email will vary, based on a number of text options. One of each of the phrases or words in brackets, separated by a "|", will appear:
Dear user {<recipient's email address>|of <recipient's email domain>},{ {{M|m}ail {system|server} administrator|administration} of <recipient's email domain> would like to {inform you{ that{:|,}|}|let you know {that|the following}{.|:|,}}|||||}
{We have {detected|found|received reports} that y|Y}our {e{-|}mail |}account {has been|was} used to send a {large|huge} amount of {{unsolicited{ commercial|}|junk} e{-|}mail|spam}{ messages|} during {this|the {last|recent}} week.
{We suspect that|Probably,|Most likely|Obviously,} your computer {had been|was} {compromised|infected{ by a recent v{iru}s|}} and now {run|contain}s a {trojan{ed|}|hidden} proxy server.
{Please|We recommend {that you|you to}} follow {our |the |}instruction{s|} {in the {attachment|attached {text |}file} |}in order to keep your computer safe.
{{Virtually|Sincerely} yours|Best {wishe|regard}s|Have a nice day},
{<recipient's email domain> {user |technical |}support team.|The <recipient's email domain> {support |}team.}
{The|This|Your} message was{ undeliverable| not delivered} due to the following reason{(s)|}:
Your message {was not|could not be} delivered because the destination {computer|server} was
{not |un}reachable within the allowed queue period. The amount of time
a message is queued before it is returned depends on local configura-
tion parameters.
Most likely there is a network problem that prevented delivery, but
it is also possible that the computer is turned off, or does not
have a mail system running right now.
Your message {was not|could not be} delivered within <random number> days:
{{{Mail s|S}erver}|Host} <host used to send the email>} is not responding.
The following recipients {did|could} not receive this message:
<<recipient's email address>>
Please reply to postmaster@{<sender's email domain>|<recipient's email domain>}
if you feel this message to be in error.
The original message was received at [current time]{
| }from {<sender's email domain> ]|{<host used to send the email>]|]}}
----- The following addresses had permanent fatal errors -----
{<<recipient's email address>>|<recipient's email address>}
{----- Transcript of {the ||}session follows -----
... while talking to {host |{mail |}server ||||}{<recipient's email domain>.|<host used to send the email>]}:
{>>> MAIL F{rom|ROM}:[From address of mail]
<<< 50$d {[From address of mail]... |}{Refused|{Access d|D}enied|{User|Domain|Address} {unknown|blacklisted}}|554 <<recipient's email address>>... {Mail quota exceeded|Message is too
large}
554 <<recipient's email address>>... Service unavailable|550 5.1.2 <<recipient's email address>>... Host unknown (Name server: host not found)|554 {5.0.0 |}Service unavailable; ] blocked using {relays.osirusoft.com|bl.spamcop.net}{, reason: Blocked|}
Session aborted{, reason: lost connection|}|>>> RCPT To:<<recipient's email address>>
<<< 550 {MAILBOX NOT FOUND|5.1.1 <<recipient's email address>>... {User unknown|Invalid recipient|Not known here}}|>>> DATA
{<<< 400-aturner; %MAIL-E-OPENOUT, error opening !AS as output
|}{<<< 400-aturner; -RMS-E-CRE, ACP file create failed
|}{<<< 400-aturner; -SYSTEM-F-EXDISKQUOTA, disk quota exceeded
|}<<< 400}|}
The original message was included as attachment
{{The|Your} m|M}essage could not be delivered
Notes:
<recipient's email address> is the email address of the person receiving the email.
<recipient's email domain> is the domain of the receiver's email. For instance, if the email address is john_doe@example.com, the domain is "example.com."
<sender's email domain> is the domain of the sender's email. For instance, if the email address is john_doe@example.com, the domain is "example.com."
<host used to send the email> is name of the email server used by the infected computer. The worm gathers this information from the infected computer's registry.
Attachment:
The worm may generate an file name from a domain name of an email address gathered from the computer. For instance, if the worm finds an address john_doe@example.com on the infected computer, the attachment name could contain example.com.
The attachment name may also be one of the following:
readme
instruction
transcript
letter
file
text
attachment
document
message
with one of the following extensions:
.cmd
.bat
.com
.exe
.pif
.scr
.zip
the attachment may have a second extension, which will be one of the following:
doc
txt
htm
html
Notes:
Approximately 30% of the time, the attachment will be zipped. In these cases the attachment may be compressed several times over.
There is a 15% chance the worm will attach a small junk file to the mail instead of a copy of itself.
The worm will not send itself to addresses that contain the following strings:
mailer-d
spam
abuse
master
sample
accou
privacycertific
bugs
listserv
submit
ntivi
support
admin
page
the.bat
gold-certs
feste
not
help
foo
soft
site
rating
you
your
someone
anyone
nothing
nobody
noone
info
winrar
winzip
rarsoft
sf.net
sourceforge
ripe.
arin.
gnu.
gmail
seclist
secur
bar.
foo.com
trend
update
uslis
domain
example
sophos
yahoo
spersk
panda
hotmail
msn.
msdn.
microsoft
sarc.
syma
avp
Removal Instructions:
Disable System Restore (Windows Me/XP).
Update the virus definitions.
Restart the computer in Safe mode or VGA mode.
Run a full system scan and delete all the files detected as W32.Mydoom.N@mm.
Reverse the changes made to the registry.
To reverse the changes made to the registry
Important: Symantec strongly recommends that you back up the registry before making any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify the specified keys only. Read the document, "How to make a backup of the Windows registry," for instructions.
Click Start > Run.
Type regedit
Then click OK.
Navigate to each of the following keys:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
In the right pane, delete the values if exist:
"Services" = "%Windir%\services.exe"
"JavaVM" = "%Windir%\java.exe"
Navigate to the keys:
HKEY_LOCAL_MACHINE\Software\Microsoft\Daemon
HKEY_CURRENT_USER\Software\Microsoft\Daemon
and delete them.
Exit the Registry Editor.
Restart the computer in Normal mode.
[url=\"http://securityresponse.symantec.com/avcenter/venc/data/w32.mydoom.n@mm.html\"]Symantec Source[/url]