Sophos

W32/Mirsa-A

Aliases
  • W32/Mirsa@MM
  • WORM_MIRSA.A
Category
Type
What to do
Prevalence low high

Summary

 
How it spreads
  • Email attachments
Affected operating systems Windows
Included in our products from March 2005 (3.91)
Protection available since 25 January 2005 23:14:46 (GMT)
Detected by All Sophos products

Action

More Information

W32/Mirsa-A is a mass-mailing email worm.

W32/Mirsa-A will arrive as an attachment in an email with the following body text:

Please look at the enclosed CV
Its really important that you read this
Thanks

The attachment will have one of the following filenames:

Curriculum.Vitae.DOC.exe, C.V.DOC.exe, CVitae.DOC.exe, CV.DOC.exe, Profile.DOC.exe, Personal.DOC.exe

W32/Mirsa-A will spread by emailing itself out to addresses found in the Windows Address Book.

W32/Mirsa-A will attempt to copy itself to the following locations:

/C.V.DOC.exe
/CV.DOC.exe
/CVitae.DOC.exe
/Curriculum.Vitae.DOC.exe
/Profile.DOC.exe
/mrsa.exe
/system.exe
/windows/Notepad2.exe
/windows/mrsa.exe
/Program Files/Microsoft Office/Office/Winword2.exe
/Program Files/Accessories/Wordpad2.exe
/Program Files/Accessories/Mspaint2.exe

In order to run automatically each time a user logs on, W32/Mirsa-A will set the following registry entries:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run
Notepad
C:\MRSA.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\Run
Explorer
C:\MRSA.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Keyboard
C:\MRSA.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
System
C:\MRSA.exe

W32/Mirsa-A will modify the WIN.INI file in the Windows folder by adding an entry pointing to "c:\MRSA.exe" in the Windows section under the parameters LOAD, OPEN and RUN.

On NT-based systems, the changes will be reflected in the following registry entries:

HKCU\Software\Microsoft\Windows NT\CurrentVersion\Windows
load
c:\MRSA.exe

HKCU\Software\Microsoft\Windows NT\CurrentVersion\Windows
OPEN
c:\MRSA.exe

HKCU\Software\Microsoft\Windows NT\CurrentVersion\Windows
RUN
c:\MRSA.exe

W32/Mirsa-A may add shortcut files to itself in the following Startup folder locations:

\WINDOWS\All Users\Start Menu\Programs\StartUp\MSWord.lnk
\WINDOWS\All Users\Start Menu\Programs\StartUp\New.lnk

W32/Mirsa-A may attempt to drop the following text into a Word document:

Fathers 4 Justice
Coded by UK Digital Binary Division
UK Government will listen Fathers 4 Justice
respect to:
RanSid
DILENGER
NEWORDER
KJ
VosLar

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