detecting-cobalt-strike-beacons SKILL.md skillA
detecting-cobalt-strike-beacons from lyther/agent-surface is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add lyther/agent-surface/detecting-cobalt-strike-beacons@git:20260920.3643162Pins git:20260920.3643162 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- lyther/agent-surface
- Path
mcps/grimoire/test/fixtures/pack/skills/detecting-cobalt-strike-beacons/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260920.3643162, committed Sep 20, 2026
- First version recorded
- Jun 30, 2026
- Size
- 652 bytes
- Repository stars
- 65
- License
- MIT
Detect Cobalt Strike C2 beacons in network captures by spotting jittered.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Detecting Cobalt Strike Beacons Cobalt Strike beacons phone home to a team server on a configurable, often jittered, interval. Look for periodic HTTP(S) check-ins with low variance, default URIs from known malleable C2 profiles, and SMB named-pipe usage for lateral movement. See references/iocs.md for indicators.
Read the whole file at its exact version.
How to install
mdr add lyther/agent-surface/detecting-cobalt-strike-beacons@sha256:32becbc4600af5a6The line at the top of this page pins the label git:20260920.3643162, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_jlsseul6faspwsoa)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Jun 30, 2026 and Sep 20, 2026, about one every 82 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260920.3643162 latest | 2026-09-20 | 3643162 | 652 B | A | view · diff |
| git:20260630.26f0168 | 2026-06-30 | 26f0168 | 652 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (652 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
lyther/agent-surface · 65 stars · license MIT · pushed 2026-10-20 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_jlsseul6faspwsoa GET https://markdownregistry.com/api/v1/resolve?ref=lyther/agent-surface/detecting-cobalt-strike-beacons GET https://markdownregistry.com/api/v1/blob/32becbc4600af5a6c8dc0ba55c107b1eb139cbfb7a7b7de55a5ff150011e9d6b
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.