HIGH VIRUS ALERT - 'Mydoom' Worm

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Virus Characteristics This is a mass-mailing and peer-to-peer file-sharing worm that bears the following characteristics:

 

-contains its own SMTP engine to construct outgoing messages

-contains a backdoor component (see below)

-contains a Denial of Service payload

-If you think that you may be infected with Mydoom, and are unsure how to check your system, you may download the VIRUS CHECKER to scan your system and remove the virus if present. This is not required for McAfee users as -McAfee products are capable of detecting and removing the virus with the latest update. (see the removal instructions below for more information).

 

Note: Receiving an email alert stating that the virus came from your email address is not an indication that you are infected as the virus often forges the from address.

The virus arrives in an email message as follows:

 

(Spoofed email sender)

Do not assume that the sender address is an indication that the sender is infected. Additionally you may receive alert messages from a mail server that you are infected, which may not be the case.

(Varies, such as)

 

Error Status Server Report Mail Transaction Failed Mail Delivery System hello hi

Body: (Varies, such as)

The message cannot be represented in 7-bit ASCII encoding and has been sent as a binary attachment. The message contains Unicode characters and has been sent as a binary attachment. Mail transaction failed. Partial message is available. Attachment: (varies [.bat, .exe, .pif, .cmd, .scr] - often arrives in a ZIP archive) (22,528 bytes)

 

examples (common names, but can be random)

doc.bat document.zip message.zip readme.zip text.pif hello.cmd body.scr test.htm.pif data.txt.exe file.scr

In the case of two file extensions, multiple spaces may be inserted as well, for example:

 

document.htm (many spaces) .pif The icon used by the file tries to make it appear as if the attachment is a text file:

 

When this file is run (manually), it copies itself to the WINDOWS SYSTEM directory as taskmon.exe

%SysDir%\taskmon.exe (Where %Sysdir% is the Windows System directory, for example C:\WINDOWS\SYSTEM)

It creates the following registry entry to hook Windows startup:

 

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\

CurrentVersion\Run "TaskMon" = %SysDir%\taskmon.exe The virus uses a DLL that it creates in the Windows System directory:

 

%SysDir%\shimgapi.dll (4,096 bytes) This DLL is injected into the EXPLORER.EXE upon reboot via this registry key:

 

HKEY_CLASSES_ROOT\CLSID\{E6FB5E20-DE35-11CF-9C87-00AA005127ED}\InProcServer32 "(Default)" = %SysDir%\shimgapi.dll

The virus will not replicate on the 12th February or later (although the DLL will still be installed).

 

Peer To Peer Propagation

The worm copies itself to the KaZaa Shared Directory with the following filenames:

 

nuke2004 office_crack rootkitXP strip-girl-2.0bdcom_patches activation_crack icq2004-final winamp

Remote Access Component

The worm (this functionality is in the dropped DLL) opens a connection on TCP port 3127 (if that fails it opens next available port up to port 3198). The worm can accept specially crafted TCP transmissions.

On receipt of one kind of such a transmission it will save the embedded binary into a temporary file and execute it. Then the temporary file is deleted. On receipt of another kind it can relay TCP packets thus providing IP spoofing capabilities (possibly to facilitate SPAM distribution)

Denial of Service Payload

If the worm is run after February 1st 16:09:18 (UTC), it changes its behavior from mass mailing to initiating a denial of service attack against www.sco.com. This denial of service attack will stop on the first system startup after February 12th 02:28:57 (UTC) , and thereafter the worm's only behavior is to continue listening on TCP port 3127 (or upto 3198).

HIGH VIRUS ALERT - 'Mydoom' Worm

 

Indications of Infection

Upon executing the virus, Notepad is opened, filled with nonsense characters.

Existence of the files and registry entry listed above

Method of Infection This worm tries to spread via email and by copying itself to the shared directory for Kazaa clients if they are present.

 

The mailing component harvests address from the local system. Files with the following extensions are targeted:

 

wab adb tbb dbx asp php sht htm txt pl

The worm avoids certain address, those using the following strings:

 

..gov .mil abuse acketst arin. avp berkeley borlan bsd example fido foo. fsf. gnu google gov. hotmail iana ibm.com icrosof ietf inpris isc.o isi.e kernel linux math mit.e mozilla msn. mydomai nodomai panda pgp rfc-ed ripe. ruslis secur sendmail sopho syma tanford.e unix usenet utgers.ed

Additionally, the worm contains strings, which it uses to randomly generate, or guess, email addresses. These are prepended as user names to harvested domain names:

 

sandra linda julie jimmy jerry helen debby claudia brenda anna alice brent adam ted fred jack bill stan smith steve matt dave dan joe jane bob robert peter tom ray mary serg brian jim maria leo jose andrew sam george david kevin mike james michael john alex

Finally the virus sends itself via SMTP - constructing messages using its own SMTP engine. The worm guesses the recipient email server, prepending the target domain name with the following strings:

 

mx. mail. smtp. mx1. mxs. mail1. relay. ns.

HIGH VIRUS ALERT - 'Mydoom' Worm

 

 

 

 

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