I-Worm.Updater
Details
I-Worm.Updater.a
This is a virus-worm that spreads via the Internet attached to infected e-mails. The worm itself is a Windows PE EXE file about 12Kb in length, and it is written in Visual Basic (VB6). It is packed by the UPX program. After unpacking, it is 45 Kb in size.
The worm activates from an infected e-mail only when a user clicks on an attached file. The worm then installs itself to the system, runs a spreading routine and payload.
The infected messages have different texts and attached file names, they are randomly selected by the worm while spreading from the following variants:
Subjects:
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”
Examples:
You Should Look at this Osama Vs Bush
Fwd : Check my Patch
Attachment filenames:
“Setup.EXE”, “install.exe”, “Readme.exe”, “Files.exe”, “Picture.exe” “Quotation.Doc.exe”, “Letter.Doc.exe”, “Picture.jpg.exe”
Body:
Hi:
This is the file you ask for, Please save it to disk and open this file, it’s very important.
Sample message:
Installation
While installing, the worm copies itself to the C:\WINDOWS\ directory with the UPDATE.EXE name, and registers that file in the system-registry auto-run key:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run Update = C:\WINDOWS\Update.exe
The worm then displays the following fake error message:
Payload
The worm creates the file C:\WINDOWS\STARTM~1\PROGRAMS\STARTUP\Update.vbs. This script file starts automatically after rebooting a system under Windows 9x/ME. It looks for files on all drives with the following extensions: EXE, DOC, TXT. It creates script copies with the same names plus the extra extension “.vbs”. For example:
MPLAYER.EXE.vbs
NOTEPAD.EXE.vbs
This script file contains the strings:
I-WORM.IMELDA.B
(C)2001, by Iwing
Virusindo - Indonesian Virus Network
http://indovirus.8m.com , IRC Dalnet #indovirus
The worm changes the volume label on disk C:, then the IMELDA
The worm also copies itself to the C:\WINDOWS\ directory with one of the following names:
“Setup.EXE”, “install.exe”, “Readme.exe”, “Files.exe”, “Picture.exe” “Quotation.Doc.exe”, “Letter.Doc.exe”, “Picture.jpg.exe”
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