Threat description




Updater is a mass mailing worm that is a Windows PE executable. Its size is about 12 KB and it is written in Visual Basic (VB6). It packed by the program UPX. After unpacking its size is 45 KB.

The worm activates from infected email only in case a user clicks on attached file. The worm then installs itself to the system, runs spreading routine and payload.


Automatic action

Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.

More scanning & removal options

More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.

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

Contact Support

F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.

Technical Details

The infected messages have different texts and attached file names, they are randomly selected by worm while spreading from following variants:

Subjects are:

 Part1 + Part2 + Part3 + Part4

 Part1 = "Have you ", "You Should ", "Just ", "Why Not you ", "How to ", "Re: ",

 "Fwd : ", " "
 Part2 = "Check ", "Check out ", "Watch out ", "Open ", "Look at "
 Part3 = "this ", "my ", "For this ", "The "
 Part4 = "Picture", "Program", "Patch", "Nude pic", "Report", "Documment",

 "Quotation", "Transaction", "Bank Account", "WTC Tragedy", "Osama Vs Bush"

 "Account", "Private Pic" 		


You Should Look at this Osama Vs Bush
 Fwd : Check my Patch

Atach filenames are:

"Setup.EXE", "install.exe", "Readme.exe", "Files.exe", "Picture.exe"
 "Quotation.Doc.exe", "Letter.Doc.exe", "Picture.jpg.exe"


This is the file you ask for, Please save it to disk and open this file,
it's very important.

When the worm is executed, it copies itself to the C:\WINDOWS\ directory with the UPDATE.EXE name and registers that file in system registry auto-run key:


 Update = C:\WINDOWS\Update.exe 	

The worm then displays a fake error message:

Cannot Open files : It does not appear to be a valid archive
if you Downloaded this file , try downloading the file again.
 [ OK ]

Next the worm creates the file C:\WINDOWS\STARTM~1\PROGRAMS\STARTUP\Update.vbs. This script file starts automatically after rebooting system under Windows 9x/ME. It looks for files on all drives with expansions: EXE, DOC, TXT. It creates script copies with the same names + expantion: ".vbs" For example:


This script file contains the strings:


The worm changes a volume label on disk C: the the IMELDA.

The worm also copies itself to the C:\WINDOWS\ directory with one of this names:

"Setup.EXE", "install.exe", "Readme.exe", "Files.exe",
"Picture.exe" "Quotation.Doc.exe", "Letter.Doc.exe", "Picture.jpg.exe"

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