Email-Worm:W32/Zhelatin.CT

Classification

Malware

Email-Worm

W32

Email-Worm:W32/Zhelatin.CT

Summary

The Zhelatin.CT worm started to spread on April 13th, 2007. The worm spreads in emails with love-related subjects and with attachments named "Love Card.exe", "Greeting Card.exe" and so on. A bit later the same variant spread using security-related subjects.

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

The functionality of the Zhelatin.CT worm variant is similar to Zhelatin.CQ , however the subjects and attachment names it uses are different.

On April 13th several emails with love themed subjects were seen in the wild. While some of the subjects are a rehash of previously used subjects such as Sending You My Love, The Dance of Love, and When I'm With You, others are new:

  • A Dream is a Wish
  • A Is For Attitude
  • Eternal Love
  • Eternity of Your Love
  • Falling In Love with You
  • Hugging My Pillow
  • Inside My Heart
  • Kisses Through email
  • Our Journey
  • Sent with Love
  • When Love Comes Knocking
  • You're In My Thoughts
  • You're the One

The email messages themselves have no text, instead, they have attached executables with romantic sounding filenames. These include:

  • Love Card.exe
  • Love Postcard.exe
  • Greeting Card.exe
  • Postcard.exe

Here is an example of the worm's email:

A second run occurred after a few hours. This time, the subjects were security related:

  • ATTN!
  • Spyware Alert!
  • Virus Alert!
  • Worm Alert!
  • Worm Detected!

Furthermore, the message body is an image file which advises the receiver to patch their systems. Also included within the image is a password in order to extract the attachment. Here is an example:

Something new to the Zhelatin family is the use of a password protected Zip archive as an attachment. The filenames vary but they have the following format:

  • patch-[4 to 5 random numerical characters].zip
  • hotfix-[4 to 5 random numerical characters].zip

The executable contained within the Zip archive has the same name as that of the archive but with an EXE extension.