Summary
Zar.A is a simple massmailer that attempts to spread on emails with subject "Tsunami Donation! Please help!".
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
When run, Zar.A makes three copies of itself with the following names:
- %WinDir%\raz32.exe
- %WinDir%\crssr.exe
- %WinDir%\tsunami.exe
where %WinDir% is Windows folder, for example 'C:\Windows\' on a default installation of Windows XP. The "crssr.exe" file is added to the registry key
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] "CaptionMgr32" = "%systemroot%\crssr.exe"
As %systemroot% usually refers to same directory as %Windir%, this registry key ensures that the worm is run at every system startup.
Email spreading
Zar.A tries to find addresses from Microsoft Outlook address book. It uses the MAPI functions for sending infected messages for each of the addresses found in the address book.
The message is composed of subject
"Tsunami Donation! Please help!"
and message body text
"Please help us with your donation and view the attachment below! We need you!"
The worm attaches itself in messages using filename "tsunami.exe".
Payload
Zar.A attempts a Denial Of Serice attack against www.hacksector.de by issuing ICMP echo messages (ping) with huge payload.
It can also display a fake error message saying
"Fatal Error: Couldn't initialize setup (CRC)"
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