We often find mailer scripts while cleaning malicious code from websites. Some of them are easily discovered, while others are obfuscated or heavily encoded.
These “mailers” allow bad actors to send unwanted emails from your domain, and can be triggered through the misuse of a vulnerable extension or leftover backdoor malware scripts.
The $_POST Mail Came from the “Boss”
During a recent investigation, we stumbled upon a very simple mailer that got our attention – not because it was very interesting from code perspective, but because of the Subject that was used.