11 Ogos- K.Kinabalu, KOL merasakan terpanggil untuk membincangkan isu ini setelah pihak kami banyak menerima email yang dikirim oleh worm ani dari para pembaca. Bayangkan, attachment yang kana kiim tu ada yang biasa biasa nganya, tapi ada yang kana attach tu boleh dikatakan dokumen penting, kana kiim oleh worm ani aah kami (oang lain pun dapat tu) pasal working paper, suat yang kan dikiim akan pasal mohon pindah, ada lagi suat yang kana kiim agreemen pasal njual tanah, di kiim oleh pc anda tanpa disedari. Malang....!
Jadi dua haii lapas ada kami mgiimakan antidot fixsirC.exe untuk samuha ahli KOL Group...
Ada yang batanya labih lanjut pasal worm ani. Jadi anitah kami paparkan tulisan oleh owang yang pandai pandai pasal virus.... baca tia
Due to an increased rate of virus submissions, The Symantec AntiVirus Research Center (SARC) has upgraded W32.Sircam.Worm@mm from a level 3 to a level 4 virus threat.
W32.Sircam.Worm@mm contains its own SMTP engine, and propagates in a manner similar to the W32.Magistr.Worm.
Due to what appears to be a bug, this worm does not replicate under Windows NT or 2000.
SARC has created a tool to remove this worm.
CAUTION: In some cases, if you have had NAV quarantine or delete infected files, you will not be able to run .exe files, however you will still be able to run the removal tool.
Also Known As: W32/SirCam@mm, Backdoor.SirCam
Type: Worm
Damage:
Payload Trigger: 1) October 16th, or some attached file contents, triggers file deletion payload. 2) If the file deletion occured, or after 8000 executions, triggers the space filler payload.
Large scale e-mailing: The worm appends a random document from the infected PC to itself and sends this new file via email
Deletes files: 1 in 20 chance of deleting all files and directories on C:. Only occurs on systems where the date is October 16 and which are using D/M/Y as the date format. Always occurs if attached file contains "FS2" not followed by "sc".
Degrades performance: 1 in 50 chance of filling all remaining space on the C: drive by adding text to the file c:\recycled\sircam.sys
Releases confidential info: It will export a random document from the hard drive by appending it to the body of the worm
Distribution:
Subject of email: Random subject - the filename of the attachment
Name of attachment: A file from the sender's computer with the extension .bat, .com, .lnk, or .pif added to it.
Size of attachment: at least 134kb long
Shared drives: searchs for shared drives and copies itself to those it finds
Technical description:
This worm arrives as an email message with the following content:
Subject: The subject of the email will be random, and will be the same as the file name of the email attachment.
Attachment: The attachment is a file taken from the sender's computer and will have the extension .bat, .com, .lnk or .pif added to it.
Message: The message body will be semi-random, but will always contain one of the following two lines (either English or Spanish) as the first and last sentences of the message.
Spanish Version:
First line: Hola como estas ?
Last line: Nos vemos pronto, gracias.
English Version:
First line: Hi! How are you?
Last line: See you later. Thanks
Between these two sentences, some of the following text may appear:
Spanish Version:
Te mando este archivo para que me des tu punto de vista
Espero me puedas ayudar con el archivo que te mando
Espero te guste este archivo que te mando
Este es el archivo con la informaci=n que me pediste
English Version:
I send you this file in order to have your advice
I hope you can help me with this file that I send
I hope you like the file that I sendo you
This is the file with the information that you ask for
When run, the worm performs the following actions:
1. It creates copies of itself as %TEMP%\sircam.exe and C:\Recycled\sircam.exe name>, which contain the attached document. This document is then run using the program registered to handle the specific file type. For example, if it is saved as a file with the .doc extension, it will run using Microsoft Word or Wordpad. A file with the .xls extension will open in Excel, and one with the .zip extension will open in your default zip program, such as WinZip.
2. It copies itself to C:\Recycled\Sirc32.exe and %System%\Scam32.exe.
3. It adds the value
Driver32=%System%\scam32.exe
to the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\
Microsoft\Windows\CurrentVersion\RunServices
4. It creates the following registry key:
HKEY_LOCAL_MACHINE\Software\SirCam
with the following values:
FB1B - Stores the file name of the worm as stored in the Recycled directory.
FB1BA - Stores the SMTP IP address.
FB1BB - Stores the email address of the sender.
FC0 - Stores the number of times the worm has executed.
FC1 - Stores what appears to be the version number of the worm.
FD1 - Stores the file name of worm that has been executed, without the suffix.
5. The (Default) value of the registry key
HKEY_CLASSES_ROOT\exefile\shell\open\command
is set to
C:\recycled\sirc32.exe "%1" %*"
This enables the worm to execute itself any time that an .exe file is run.
6. The worm is network aware, and it will enumerate the network resources to infect shared systems. If any are found, it will do the following:
Attempt to copy itself to <Computer>\Recycled\Sirc32.exe
Add the line "@win \recycled\sirc32.exe" to the file <Computer>\Autoexec.bat
Copy <Computer>\Windows\Rundll32.exe to <Computer>\Windows\Run32.exe
Replace <Computer>\Windows\rundll32.exe with C:\Recycled\Sirc32.exe
7. There is a 1 in 33 chance that the following actions will occur:
The worm copies itself from C:\Recycled\Sirc32.exe to %Windows%\Scmx32.exe
The worm copies itself as "Microsoft Internet Office.exe" to the folder referred to by the registry key:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders\Startup
8. There is a 1 in 20 chance that on October 16th of any year, the worm will recursively delete all files and folders on the C drive.
This payload functions only on computers which use the date format D/M/Y (as opposed to M/D/Y or similar formats).
Additionally, the payload will always activate immediately, regardless of date and date format, if the file attached to the worm contains the sequence "FA2" without the letters "sc" following immediately.
9. If this payload activates, the file C:\Recycled\Sircam.sys is created and filled with text until there is no remaining disk space. The text is one of two strings:
[SirCam_2rp_Ein_NoC_Rma_CuiTzeO_MicH_MeX]
or
[SirCam Version 1.0 Copyright ¬ 2000 2rP Made in / Hecho en - Cuitzeo, Michoacan Mexico]
10. The worm contains its own SMTP engine which is used for the email routine. It obtains email addresses through two different methods:
It searches the folders that are referred to by the registry keys
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders\Cache
and
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders\Personal
for sho*., get*., hot*., *.htm files, and copies email addresses from there into the file %system%\sc?1.dll
where ? is a different letter for each location, as follows:
scy1.dll: addresses from %cache%\sho*., hot*., get*.
sch1.dll: addresses from %personal%\sho*., hot*., get*.
sci1.dll: addresses from %cache%\*.htm
sct1.dll: addresses from %personal%\*.htm
It searches %system% and all subfolders for *.wab (all Windows Address Books) and copies addresses from there into %system%\scw1.dll.
11. It searches the folders referred to by the registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders\Personal
and
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Shell Folders\Desktop
for files of type .doc, .xls, and .zip, and stores the filenames in %system%\scd.dll. One of these files will be appended to the worm's original executable and this new file will be sent as the email attachment.
The From: email address and mail server are taken from the registry. If no email account exists, then the current user name will be prepended to "prodigy.net.mx", eg if the current user logged on as JSmith, then the address will be "jsmith@prodigy.net.mx". Then the worm will attempt to connect to a mail server. This will be either the mail server taken from the registry, or one of
prodigy.net.mx
goeke.net
enlace.net
dobleclick.com.mx
The language used for the mail depends on the language used by the sender. If the sender uses Spanish, then the mail will be in Spanish, otherwise it will be in English. The attachment is chosen randomly from the list of files in the scd.dll.
CAUTION:
1. In some cases, if you have had NAV quarantine or delete infected files, you will not be able to run .exe files, however you will still be able to run the removal tool.
2.If you are using Windows Me, and a copy of the worm is detected in the _Restore folder when running the tool, the tool cannot remove it from that folder, as it is protected by Windows.
If you are on a network, or have a full time connection to the Internet, disconnect the computer from the network and the Internet. Disable or password protect file sharing before reconnecting computers to the network or to the internet.
IMPORTANT: Do not skip this step. You must disconnect from the network before attempting to remove this worm.
If a computer was infected more the once, as can happen when using shared folders across a network, the Run32.exe file will have been be overwritten with an infected copy of the Run32dll.exe. If you see more than one entry of "@win \recycled\sirc32.exe" when performing the steps in the section "To edit the Autoexec.bat file", do not attempt to rename the file. Instead, you must delete the Run32.exe and the Run32dll.exe files and then extract an new copy of Run32dll.exe from a clean back up or from the Windows installation CD. See your Windows documentation for information on how to do this.
Write-up by: Peter Ferrie and Peter Szor
Ehsan Symantec, 2001
Jadi KOL berharap para pembaca tidak mengambil ringan masalah yang ditimbulkan oleh worm ini
KOL
END
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