Powershell Empire http listeners show index page similar to IIS7 page and an IIS7.5 server header. Instead of using Windows \r\n they are using Linux \n for newlines. The hash for this index page is b8c892fbb49921529be6f6ce17685c31724f76959111b28f39e39dc299b8acaf. The listeners can be verified by requesting non-existing pages and checking for statuscode 200 (OK) instead of 404 (not found). The ending of the page itself, contains a random amount of spaces (to prevent signature based detection). Sourcecode of Empire listener: https://github.com/EmpireProject/Empire/blob/master/lib/listeners/http_com.py Servers could be malicious, or just part of a red teaming action.