Natas

Classification

Malware

Virus

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Natas

Summary

Natas is a highly polymorphic virus that has been reported to be in the wild in USA and in several other locations - it is especially common in Mexico.

Removal

Automatic action

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.

Suspect a file is incorrectly detected (a False Positive)?

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 detection database 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.

Find out more

Knowledge Base

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User Guide

See the user guide for your product on the Help Center.

Contact Support

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Submit a sample

Submit a file or URL for further analysis.

Technical Details

Natas infects COM, EXE and overlay files and both MBR's on hard disks and DOS boot records on floppies.

Natas is also a stealth virus, hiding its presence when it is resident in memory. This makes Natas one of the few known polymorphic stealth viruses; only Tremor, Uruguay, and Neuroquila have implemented similar functionality. The stealth mechanisms in Natas are quite tricky; whenever a known archiver is executed, the stealth routines are disabled. The virus does this in order to make sure it gets a chance to spread from a machine to another.

Natas is a destructive virus. It activates in 1/512 probablity when an infected file is executed. The desctruction routine is also executed if the virus detects a debugger. When activating, the virus overwrites most of the first hard drive in the system.

There are four known variants, 4744, 4746, 4774 and 4988 bytes in length. They contain several different internal texts, like:

Natas
 BACK MODEM
 Time has come to pay (c)1994 NEVER-1
 Yes I know my enemies.
 They're the teachers who taught me to fight me
 Compromise, conformity, assimilation, submission
 Ignorance, hypocrisy, brutality, the elite
 All of whitch are American dreams
 (c) 1994 by Never-1(Belgiƫum Most Hated)
 Sandrine B.

The author of this virus, James G alias Priest alias Little Loc has also written several other viruses, including Predator, Jackal and Sat_Bug.