Threat Description

Astia

Details

Aliases: Titasic, Astia.A
Category: Malware
Type: Virus
Platform: W97M

Summary


W97M/Astia is a Word 97 macro virus that activates when an infected document is opened. At this point it infects the global template and every document thereafter.



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More

Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for further assistance.



Technical Details


When the Word is closed, the virus creates two infected template files to the Word's startup directory: "SNrml.src" and "SNrml.dot".

The virus replaces the "Tools/Macros/Visual Basic Editor" and "Tools/Macros/Macro" menu selections with its own dialog box containing the following text:

Maaf..         Anda jangan coba-coba mengedit, merubah, ataupun menghapus         makro Titasic..!!         Anda hanya bisa merekam makro, menyimpan, menggunakan         serta menghapus makro buatan Anda         Apakah Anda ingin merekam makro..?  

If user selects "Yes" from the dialog box, the virus attempts to start the macro recorder.

Since October 10th, 1998 the virus activates its payload when Word has been running for 45 minutes. At this point it will create a new document with a form. This form will contain some graphics as well as the following texts one at the time:

Mungkin kehadiran TITASIC mengganggu kesibukan Anda, untuk itu         maafkanlah kelancangan Titasic ..         Ingat...!! Radiasi komputer berbahaya bagi Anda! So..         istirahatlah sejenak biar enggak stres, pusing, uring-uringan,         dsb..!         Buat Cewek 'SINGLE' yang merasa dirinya Cakeup & Manis..,         Salam dari Astia..!         Mangga bilih bade didamel deui.!  

Variant:Astia.B

W97M/Astia.B activates its payload since October 15th, 1998 when Word has been running for 45 minutes. Otherwise it is the same as W97M/Astia.A.


Variant:Astia.C

W97M/Astia.C is like W97M/Astia.A but the text that the virus shows when its payload activates is slightly modified.


Variant:Astia.L

ALIAS:Mamm

W97M/Astia.L uses different file names in the Word's startup directory, "MAMM.dot" and "MAMM.src", and it contains no payload.


Variant:Astia.O

This variant is like W97M/Astia.A but the Titasic macro has been removed and there is no payload.


Variant:Astia.Y

ALIAS:BMH

W97M/Astia.Y is a modified variant of W97M/Astia.A.

After August, 7th 1998 when the Word has been running for 15 minutes, the virus activates its payload. The payload changes the title text of Word to "Boo" and creates a new document with a form that contains the following texts:

  Infected Boomv1.01     Me, No longer to stay in your computer!     Beware of the Boomv1.01!     BmH guess who(m) am I     thanks to (UserName)  

where "(UserName)" is replaced with the current user name.

The virus also replaces "Tools\Macros\Visual Basic Editor" and "Tools\Macros\Macro" with a dialog box with the following text:

  Are you sure want to create a new macro ?  

If the user selects "Yes" button, the virus attempts to start the macro recorder.





Description Details: Analysis: Katrin Tocheva and Sami Rautiainen, F-Secure


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