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update: Potential Netcat Reverse Shell Execution - add nc.openbsd and nc.traditional binary matches #6013

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update: Potential Netcat Reverse Shell Execution - add nc.openbsd and nc.traditional binary matches #6013

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c4ffe4e
Update proc_creation_lnx_install_root_certificate.yml
Bit-ByteBandit May 4, 2026
eb9906b
Update proc_creation_lnx_netcat_reverse_shell.yml
Bit-ByteBandit May 14, 2026
f818076
Merge branch 'master' into netcat-reverse-shell-fix
swachchhanda000 May 15, 2026
efe31ce
Merge branch 'master' into netcat-reverse-shell-fix
swachchhanda000 May 22, 2026
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8 changes: 4 additions & 4 deletions rules/linux/process_creation/proc_creation_lnx_install_root_certificate.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@ references:
- https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1553.004/T1553.004.md
author: Ömer Günal, oscd.community
date: 2020-10-05
modified: 2022-07-07
modified: 2026-05-04
tags:
- attack.defense-impairment
- attack.t1553.004
Expand All @@ -15,9 +15,9 @@ logsource:
category: process_creation
detection:
selection:
Image|endswith:
- '/update-ca-certificates'
- '/update-ca-trust'
CommandLine|contains:
- 'update-ca-certificates'
- 'update-ca-trust'
Comment on lines +18 to +20

@swachchhanda000 swachchhanda000 May 22, 2026 •
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Either close your old PR #6013 to keep this change here (making all the necessary changes of PR title, description etc ofc) or remove this change

condition: selection
falsepositives:
- Legitimate administration activities
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5 changes: 4 additions & 1 deletion rules/linux/process_creation/proc_creation_lnx_netcat_reverse_shell.yml
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Expand Up @@ -8,8 +8,9 @@ references:
- https://www.hackingtutorials.org/networking/hacking-netcat-part-2-bind-reverse-shells/
- https://www.infosecademy.com/netcat-reverse-shells/
- https://man7.org/linux/man-pages/man1/ncat.1.html
author: '@d4ns4n_, Nasreddine Bencherchali (Nextron Systems)'
author: '@d4ns4n_, Nasreddine Bencherchali (Nextron Systems), Eissa Bageri'

@swachchhanda000 swachchhanda000 May 22, 2026

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Suggested change
author: '@d4ns4n_, Nasreddine Bencherchali (Nextron Systems), Eissa Bageri'
author: '@d4ns4n_, Nasreddine Bencherchali (Nextron Systems)'

Adding a few entries to existing logic doesn't constitute authorship unless a major change is made to rule's logic

date: 2023-04-07
modified: 2026-05-14
tags:
- attack.execution
- attack.t1059
Expand All @@ -20,6 +21,8 @@ detection:
selection_nc:
Image|endswith:
- '/nc'
- '/nc.openbsd'
- '/nc.traditional'
- '/ncat'
Comment on lines 23 to 26

@swachchhanda000 swachchhanda000 May 22, 2026

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Suggested change
- '/nc'
- '/nc.openbsd'
- '/nc.traditional'
- '/ncat'
- '/nc.openbsd'
- '/nc.traditional'
- '/nc'
- '/ncat'
- '/netcat.openbsd'
- '/netcat.traditional'
- '/netcat'

selection_flags:
CommandLine|contains:
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