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NetSky.M

Classification

Category: Malware

Type: Email-Worm

Aliases: NetSky.M, W32/Netsky.M, I-Worm.Netsky.m

Summary


The Netsky.M variant discovered on March 11th 2004. It drops itself as AVprotect9x.exe to Windows directory.

Removal


Automatic action

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

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About the product

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Submit a sample

Submit a file or URL for further analysis.

Technical Details


This new variant is almost identical to Netsky.L, with some minor changes in the appearance of the emails in which it spreads.

It will create the following key to point to itself:

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
"9xHtProtect" = %sysdir%\AVprotect9x.exe

And create a mutex named "Rabbo_Mutex" so it's not run more than once.

Email Spreading

It will spread using any of the following subjects:

Re:
Requested file
Re:
My file
Re:
My document
Re:
My information
Re:
My details
Re:
Information
Re:
Improved
Re:
Requested document
Re:
Document
Re:
Details
Re:
Your document
Re:
Your details
Re:
Approved

With message bodies from the list:

Details for %s.
Document %s.
I have received your document. The improved document %s is attached.
I have attached your document %s.
Your document %s is attached to this mail.
Authentification for %s required.
Requested file %s.
See the file %s.
Please read the important message msg_%s.
Please confirm the document %s.
%s is attached.
Your file %s is attached.
Please read the document %s.
Your document %s is attached.
Please read the attached file %s.
Please see the attached file %s for details.

Where '%s' will be substituted by a text string.

And with attachment names from:

improved_%s
message_%s
detailed_%s
your_document_%s
word_doc_%s
doc_%s
articel_%s
picture_%s
file_%s
your_file_%s
details_%s
document_%s

Where '%s' will be substituted by a text string.