Worm:W32/NetSky.I

Classification

Malware

W32

NetSky.I
W32/NetSky.I@mm
I-Worm.NetSky.i
W32.NetSky.I@mm

Summary

A new variant of Netsky worm - Netsky.I was found on March 7th, 2004. This worm variant sends messages with an attachment name that looks like a hyperlink to INDEX.SCR file.

Removal

Technical Details

Descriptions of all previous NetSky worm variants can be found here:

The worm's file is a PE executable file 22016 bytes long, packed with PE-Pack file compressor. The unpacked file's size is over 27 kilobytes.

NetSky.I worm has a few modifications comparing to previous variants:

The worm uses a different mutex: "KO[SkyNet.cz]SystemsMutex"
The worm has a bit different message for Bagle And Mydoom worm authors
On March 5th, 2004 the worm constantly beeps with PC speaker from 11:00 to 11:59. Below is the link to the WAV file with the sound that the worm makes: netsky_d.wav
The worm uses the following subject texts:
- Mail account deactivated
- Mail account closed
- Mail account expired
The worm uses the following message body texts:
- Your mail account expired. Please follow the link to reactivate.
- Your mail account has been closed. Click on the link for further details.
- Your mail account has been deactivated. To reactivate, follow the link.
The worm sends itself as an attachment which name looks like a hyperlink:
- http://www.[recipient's_domain] /[recipients's_user_name] /index.scr
Where the [recipient's_domain] represents the domain name and suffix of an infected message's recipient and the [recipients's_user_name] represents the user name of a recipient.
The sender's name of an infected message is always 'service@[recipient's_domain] ' where [recipient's_domain] represents the domain name and suffix of an infected message's recipient.
The worm installs itself to system as FOODING.EXE file.
The worm creates the startup key named 'Tiny AV' for its file in System Registry.