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sica-fondt/knowledge/cyber-skills/skills/detecting-stuxnet-style-attacks/references/api-reference.md
Claude 24f816b6a3
Consolidate 22 sibling repos into layered organism structure 
Place useful parts of the surrounding repos into sica-fondt by layer, per the
body model (Ada = membrane; brain/endocrine/capabilities/knowledge non-Ada):

- brain/        LLM reasoning + providers (dapr, hermes, MoMoA)
- capabilities/ REPRAG sidecars: hermes tools/skills, dapr tools, parallel
                dispatch, A51 channels, and the OSINT cluster
- knowledge/    LORAG corpus: 754 cyber-skills, agency personas, secure-coding,
                MITRE ATT&CK data
- reference/    defensive threat-reference (C3, shhbruh doc) + AdaYaml parser

License handling: AGPL sources (worldosint, advanced_evolution, mercury,
Reticulum) and GPL DeTTECT are SPEC-only clean-room/port descriptions — no
copyleft code copied. MIT/Apache/data parts copied as working trees.

Safety: shhbruh escape/persistence material and C3 covert-C2 kept as reference
only, not wired into the running organism. See CONSOLIDATION.md.

https://claude.ai/code/session_01UehUqEXXJJCsHoA4voCU5c
2026-06-10 06:53:01 +00:00

2.2 KiB
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API Reference: Stuxnet-Style ICS Attack Detection

Modbus TCP Protocol

Frame Structure

Offset Size Field
0 2 Transaction ID
2 2 Protocol ID (0x0000)
4 2 Length
6 1 Unit ID
7 1 Function Code
8+ var Data

Write Function Codes (Attack-Relevant)

Code Name Risk
5 Write Single Coil Medium
6 Write Single Register Medium
15 Write Multiple Coils High
16 Write Multiple Registers High
22 Mask Write Register High

Siemens S7comm Protocol

S7 Parameter Functions

Code Name
0x04 Read Variable
0x05 Write Variable
0x1A Request Download
0x1B Download Block
0x1C Download Ended
0x28 PLC Control (Start/Stop)

Wireshark/tshark Filters

Modbus write operations

tshark -r capture.pcap -Y "modbus.func_code >= 5 && modbus.func_code <= 16"

S7comm block downloads

tshark -r capture.pcap -Y "s7comm.param.func == 0x1a || s7comm.param.func == 0x1b"

S7comm PLC stop/start

tshark -r capture.pcap -Y "s7comm.param.func == 0x28"

Stuxnet IOC Signatures

YARA Rule

rule Stuxnet_Driver {
    meta:
        description = "Stuxnet rootkit driver"
    strings:
        $mrxcls = "mrxcls.sys" ascii
        $mrxnet = "mrxnet.sys" ascii
        $mutex = "{A3BD0EA3-CD10-4258-8784-2F53E56E2010}"
    condition:
        any of them
}

Registry Keys

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\MS-DOS Emulation
HKLM\SYSTEM\CurrentControlSet\Services\MRxCls
HKLM\SYSTEM\CurrentControlSet\Services\MRxNet

Siemens Step 7 Project Structure

Organization Blocks

Block Purpose
OB1 Main program cycle
OB35 100ms cyclic interrupt
OB100 Startup

File Extensions

Extension Content
.awl Statement List source
.mc7 Compiled machine code
.s7p Project file

Snort/Suricata Rules for ICS

alert tcp any any -> any 502 (msg:"Modbus Write Multiple Registers";
  content:"|00 00|"; offset:2; depth:2;
  byte_test:1,=,16,7; sid:1000001;)