Individual skill
profinet
PROFINET (L2 EtherType 0x8892 / DCP) attack playbook — DCP Identify-All broadcast enumeration, device fingerprinting, station-name and IP reassignment (breaks IO-controller mapping), flash-LED physical location, factory-reset, RT frame injection/replay for cyclic-IO spoofing. Siemens/EU fieldbus peer of S7Comm; requires same L2 broadcast domain.
packages/decepticon/decepticon/skills/standard/exploit/ics-ot/profinet/SKILL.md
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- Network or broad shell
- Last checked
- Nov 9, 2026
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- Nov 7, 2026
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- Apache-2.0
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- agent Repository topic
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- profinet,-dcp,-siemens,-ics,-ot,-fieldbus Declared skill tag
- engineering Derived category
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# PROFINET Attack Playbook (EtherType 0x8892 / DCP)
PROFINET is the dominant European/Siemens fieldbus for deterministic real-time process automation — deployed in Siemens SIMATIC PLC networks, Beckhoff TwinCAT, Phoenix Contact, and virtually all post-2005 EU manufacturing. Unlike Modbus or EtherNet/IP, PROFINET RT operates at Layer 2 (EtherType 0x8892) — there is no IP header, no routing, and no firewall coverage at the IP layer. **The attacker must be on the same Ethernet broadcast domain (OT L2 segment, or have a SPAN/TAP into it).** DCP (Discovery and basic Configuration Protocol) provides unauthenticated device enumeration, naming, IP assignment, and factory-reset — all without credentials.
## SAFETY FIRST
DCP Set commands (station-name reassignment, IP change, factory-reset) immediately disrupt the IO-controller ↔ IO-device association. When an IO-device loses its expected station name, the PROFINET IO controller goes to `BF` (Bus Fault) state and the process typically enters a safe/halt state or continues with the last-known values depending on watchdog configuration. **This is a process-disruption event. Confirm written scope authorization before any DCP Set or RT frame injection.** DCP Identify (read) is safe.
## Prerequisites
- Physical or logical access to the OT L2 segment (direct port, rogue switch, SPAN, compromised HMI/engineering workstation on the same VLAN).
- Wireshark with `pn_dcp` dissector (ships by default — filter: `pn_dcp`).
- Python with `scapy` for DCP crafting (or `python-profinet` library).
