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Feature #4876

open

Additional FTP Buffers

Added by Brandon Murphy over 2 years ago. Updated 9 months ago.

Status:
New
Priority:
Normal
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Description

We continue to see popular commodity and APT based malware using FTP as an exfil protocol (https://attack.mitre.org/techniques/T1048/003/). There are currently very few FTP buffers and even signatures as simple as looking for specific usernames require unbuffered content matches, often times increasing the complexity of the rule and making it more prone to FN/FP.

I'd be open to provide feedback on buffers required, though I think a general purpose client -> server buffers of ftp.command, ftp.command_data and server -> client of ftp.completion_code and ftp.reply which match the current logging would be a good improvement.

As a side note - The current ftp-data example contained here https://suricata.readthedocs.io/en/latest/rules/ftp-keywords.html is a bit confusing as it makes use of the `filename:"password"` however, as I understand it, that option can be used in non filestore signatures.


Related issues 3 (3 open0 closed)

Related to Suricata - Feature #4906: ftp: add stream app-layer frame support AssignedShivani BhardwajActions
Related to Suricata - Task #6443: Suricon 2023 brainstormAssignedVictor JulienActions
Related to Suricata - Task #4772: tracking: parity between fields logged and fields available for detectionAssignedVictor JulienActions
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