Somali.A is a mass-mailing worm that terminates security-related processes and blocks antivirus-related software updates.
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 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.
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Submit a file or URL for further analysis.
Somali.A is also capable of opening a port on the infected machine. If a remote user sends strings to the opened port, the worm is able to reply to the remote user.
This malware will only run on Windows platforms that have .NET framework installed.
Upon execution, Somali.A modifies the registry so that the worm is executed every time a user logs on.
It then drops several copies of itself:
The worm also displays the following fake error messages:
Note: This message will appear on the first run on a clean machine.
Note: This message will appear if it has been run previously.
Somali.A can also propagate through network. It does this by creating a Shared folder:
And then dropping a copy of itself on the shared folder as Sound.exe.
The said shared folder has a share name of MadSoli, as seen in the screenshot below:
Subsequently, it will create the following registry key:
Somali.A attempts to mass-mail itself using mx4.mail.yahoo.com as its SMTP server.
It searches for Yahoo! email addresses on Windows folder in the files with the following extension names:
Possible Email address of the Sender:
Possible Message Body:
Somali.A checks the running processes and terminates processes with the following strings:
The worm creates the following user in the local User Group:
Note: Run the following command from the CMD prompt to check for the said user:
It also deletes all the subkeys on the following registry key:
Somali.A displays the following Message Box every 19th of the month:
The worm also creates a HOST file named HOST.file in the %windir%\system32\drivers\etc directory. This HOST file will not allow accesses to the following sites:
Somali.A opens TCP port 8051. If a remote hacker connects to the said port and sends strings through this port, Somali.A will reply with the same string with all capital letters and adds exclamation mark at the end of the string.
Somali.A creates the following auto-run registry key so that every time the user logs on, Somali.A will be executed:
For its signature, it creates the following registry key:
It creates a Mutex named MadSoli so that there will be only one instance of itself in the memory.