Techniques › T1090.003 › AN1021
AN1021 Analytic 1021
Linux · attack.mitre.org · ATT&CK Enterprise v19.2
<p>Tools such as
tor, nglite, proxychains, chisel, or custom daemons repeatedly initiate outbound sessions to multiple nodes before final destination. This behavior is abnormal for Linux services outside of VPN, monitoring, or CDN relay contexts.</p>- Detects
- T1090.003 Multi-hop Proxy
- Part of
- DET0359 Multi-hop Proxy Behavior via Relay Node Chaining, Onion Routing, and Network Tunneling
Log sources and channels
Exactly as MITRE states them in x_mitre_log_source_references. Where a channel is vague, it is vague in the source; kevmap does not tidy it.
| Log source | Channel | Data component |
|---|---|---|
| auditd:SYSCALL | execve for proxy tools | DC0032 Process Creation |
| NSM:Flow | conn.log + ssl.log with Tor fingerprinting | DC0078 Network Traffic Flow |
| Netfilter/iptables | Forwarded packets log | DC0085 Network Traffic Content |
Mutable elements
Parameters MITRE marks as environment-specific. These are the knobs you are expected to tune; they are why an analytic is not a rule.
| Field | Description |
|---|---|
ExecutablePath | Match known proxy tools, tuned for environment. |
RelayCount | Detect outbound chaining behavior through >2 IPs in short succession. |
ProtocolType | Allow filtering by ICMP, TCP/443, UDP for obfuscation channels. |