Stay Logged In

Checkbox labeled something like "Remember me" or "Keep me logged in".

Some websites generate the "remember me" cookie based on a predictable concatenation of static values, such as the username and a timestamp. Some even use the password as part of the cookie.

base64(username:md5(password))

Bruteforce - Payload processing: hash md5, add prefix, base64 encode

Don't forget to clear the session cookie, only use the "remember me" cookie