Virus Database

I-Worm.Updater.a

Description 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:
HKLMSoftwareMicrosoftWindowsCurrentVersionRun Update = C:WINDOWSUpdate.exe
The worm then displays the following fake error message:

Payload
The worm creates the file C:WINDOWSSTARTM~1PROGRAMSSTARTUPUpdate.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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Config_Boot.a

Description Config_Boot.a

This is harmless memory resident multipartite virus. It's related to the "HMA_Boot" multipartite virus. It creates a file-dropper in the root directory of the C: drive and appends the instruction to load this file into memory ("INSTALL=") to the end of the C:CONFIG.SYS file. The virus also infects the boot sector of drive A: when selecting this drive. To intercept that, the virus hooks INT 21h. While loading from an infected floppy disk the virus also hooks INT 1Ah.
It contains a text string:
C:CONFIG.SYS INSTALLHIGH=C:

Config_Boot.b

Description Config_Boot.b

This is harmless memory resident multipartite virus. It's related to the "HMA_Boot" multipartite virus. It creates a file-dropper in the root directory of the C: drive and appends the instruction to load this file into memory ("INSTALL=") to the end of the C:CONFIG.SYS file. The virus also infects the boot sector of drive A: when selecting this drive. To intercept that, the virus hooks INT 21h. While loading from an infected floppy disk the virus also hooks INT 1Ah.
It contains a text string:
C:CONFIG.SYS INSTALL=

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