It made multiple requests with identical POST parameters.

POST /j_security_check: May indicate an attempt to bypass Java server page (JSP) login mechanisms.

The IP attempted to register with the VOIP server using an invalid username.

This IP belongs to Dell Technologies.

This IP belongs to UnitedHealth Group.

This IP belongs to Plusnet.

Shell Injection: Logs show requests containing command line shell syntax, suggesting shell command injection.

The IP attempted to gain unauthorized access to the Apache server.

It attempted to perform HTTP Response Splitting attacks on the Apache server.

The IP attempted to use the Mail server to relay phishing emails to other servers.

It attempted to perform XML Entity Expansion attacks on the Apache server.

The IP was linked to numerous attacks using web shells through web servers.

GET /.git/config: Trying to access source code or repository configuration information.

It sent VOIP requests to non-existent extensions.

It tried to exploit Apache Struts vulnerabilities to compromise our web applications.

It systematically tried to exploit IMAP and POP3 vulnerabilities present in our mail service setup.

It attempted to use the FTP server to distribute intrusion detection system (IDS) evasion tools.

This IP belongs to UnitedHealth Group.

This IP belongs to Netflix.

This IP belongs to AT&T.

The IP address attempted to register as a SIP user with an invalid username.

The IP was seen performing a CSRF (Cross-site request forgery) attack to manipulate user actions.

Repeated Broken Authentication: Tons of successful authentication requests with unassociated actions could depict broken authentication mechanism.

A high number of unsuccessful SSH logins, a common target for brute force attacks.

This IP belongs to BT Central Plus.