Worm:W32/NetSky.I

Classification

Type:Email-Worm

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

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

Check for the latest database updates
First check if your F-Secure security program is using the latest updates, then try scanning the file again.
Submit a sample
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note: You need administrative rights to change the settings.

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: https://www.f-secure.com/virus-info/v-pics/netsky_d.wav
The worm uses the following subject texts:
The worm uses the following message body texts:
The worm sends itself as an attachment which name looks like a hyperlink:
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.