Network Sniffing - MacOs

A Sigma rule for process creation on macOS, by Alejandro Ortuno, oscd.community.

informational 1 ATT&CK technique 2 programs it names 6 everyday examples trip it

What it looks for

its detection, as SigmaHQ writes it

detection:
  selection:
    Image|endswith:
      - '/tcpdump'
      - '/tshark'
  condition: selection

The rule’s detection, its selections and fields in order of name. The whole rule, with its references and false positives, is on SigmaHQ, by Alejandro Ortuno, oscd.community, under the Detection Rule License 1.1. CmdID evaluates it on a command line alone: a test on what a command line cannot show, such as the parent process or the user, is not met.

Command lines that trip it

everyday examples from tldr-pages, CC BY 4.0, each read by CmdID

List available network interfaces on the page for tcpdump

tcpdump --list-interfacesIdentify

Capture the traffic of a specific interface on the page for tcpdump

sudo tcpdump --interface eth0Identify

Capture all TCP traffic showing contents (ASCII) in console on the page for tcpdump

sudo tcpdump -A tcpIdentify

Monitor packets from the default interface on the page for tshark

tsharkIdentify

Only capture packets matching a specific capture filter on the page for tshark

tshark -f 'udp port 53'Identify

Only show packets matching a specific output filter on the page for tshark

tshark -Y 'http.request.method == "GET"'Identify

The commands documented for tcpdump, tshark trip it too: each is on its program’s page, read by CmdID.

Programs and files it names

their pages here

tcpdumptshark

ATT&CK

the techniques it is tagged with

T1040Network Sniffing

Network Sniffing - MacOs

What it looks for

Command lines that trip it

Programs and files it names

ATT&CK

Other rules for T1040 Network Sniffing