I come with one incident in which one outside attacker has successfully compromised my organization user's mail id and when I checked the logs of ASA (as ASA comes first then mail server) I am not seeing any successful traffic from Source then how it could possible that attacker traffic entered to my organization and compromise one user mail id.
When I checked ASA logs in SIEM then there is no successful traffic, but there is stop traffic logs which includes the details like TCP Teardown connection, Time 00:01:00, Bytes : 51247, Reset-I.
So from the above packet logs details I am assuming that attacker has successfully established TCP connection for 1 min and in this time frame he sent/receive 51247 bytes data, that's why this compromise happens.
Please guide me on this issue or suggest me that my assumption is right or not. Thanks in advance
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