Lethic is a spambot that constantly connects to a remote server and may download additional malware into the system it infected. It utilizes process injection method to inject malicious code in explorer.exe and resume its malicious activities.
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.
Lethic gain access into a system via attachments in spam emails.
Upon execution, Lethic will first check for the presence of virtual and debugging environment. If found, it will proceed to terminate itself as a way to evade detection and analysis.
If no virtual or debugging environment found, it will proceed to add a registry key to gain persistence and then start locating the explorer.exe module for it to inject malicious code into. It will also add a mutual exclusion object (mutex) into the injected process to ensure that only one instance of itself is running.
Afterwards, it tries to connect to a malicious command and control (C&C) server using Winsock API and then waits for further instructions.
Lethic adds the following registry keys to run during startup:
Data: [dropped_path and filename].exe
It connects to the following remote server:
Lethic is capable of performing these tasks:
Analysis on file: 7a60ae98b7707de05764d78d508dc3bc946d3108
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