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Remove NDPI_FULLY_ENCRYPTED flow risk (#2779)

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Use `NDPI_OBFUSCATED_TRAFFIC` instead; this way, all the obfuscated
traffic is identified via `NDPI_OBFUSCATED_TRAFFIC` flow risk.

Disable fully-encryption detection by default, like all the obfuscation
heuristics.
This commit is contained in:
Ivan Nardi 2025-03-25 17:00:03 +01:00 • committed by GitHub
parent a8ddc4d368
commit b1edfdbf5c
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GPG key ID: B5690EEEBB952194
28 changed files with 85 additions and 48 deletions
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4
tests/cfgs/openvpn_heuristic_enabled/result/openvpn_obfuscated.pcapng.out
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@ -14,7 +14,7 @@ Automa domain: 0/0 (search/found)
Automa tls cert: 0/0 (search/found)
Automa risk mask: 0/0 (search/found)
Automa common alpns: 0/0 (search/found)
Patricia risk mask: 2/0 (search/found)
Patricia risk mask: 4/0 (search/found)
Patricia risk mask IPv6: 0/0 (search/found)
Patricia risk: 0/0 (search/found)
Patricia risk IPv6: 0/0 (search/found)
@ -27,5 +27,5 @@ NordVPN 90 27820 2
Acceptable 177 53289 3
1 TCP 107.161.86.131:443 <-> 192.168.12.156:48072 [proto: 159/OpenVPN][IP: 0/Unknown][Encrypted][Confidence: DPI (aggressive)][FPC: 0/Unknown, Confidence: Unknown][DPI packets: 40][cat: VPN/2][40 pkts/9272 bytes <-> 47 pkts/16197 bytes][Goodput ratio: 70/81][3.15 sec][bytes ratio: -0.272 (Download)][IAT c2s/s2c min/avg/max/stddev: 0/0 57/52 212/303 66/79][Pkt Len c2s/s2c min/avg/max/stddev: 66/66 232/345 1514/1090 370/406][Risk: ** Known Proto on Non Std Port **** Obfuscated Traffic **][Risk Score: 150][Risk Info: Obfuscated OpenVPN / Expected on port 1194][PLAIN TEXT (MhLYoT)][Plen Bins: 35,3,3,15,1,1,0,0,1,3,5,1,0,1,0,0,3,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,18,0,0,0,0,0,0,0,0,0,1,0,0,3,0,0]
2 TCP 192.168.12.156:37976 <-> 185.128.25.99:465 [proto: 159.426/OpenVPN.NordVPN][IP: 426/NordVPN][Encrypted][Confidence: DPI (aggressive)][FPC: 426/NordVPN, Confidence: IP address][DPI packets: 19][cat: VPN/2][29 pkts/7410 bytes <-> 31 pkts/9812 bytes][Goodput ratio: 74/79][1.73 sec][bytes ratio: -0.139 (Mixed)][IAT c2s/s2c min/avg/max/stddev: 0/0 66/26 1019/153 204/31][Pkt Len c2s/s2c min/avg/max/stddev: 66/66 256/317 1090/1514 256/424][Risk: ** Known Proto on Non Std Port **** Obfuscated Traffic **][Risk Score: 150][Risk Info: Obfuscated OpenVPN / Expected on port 1194][TCP Fingerprint: 2_64_65535_685ad951a756/Android][PLAIN TEXT (HrFTzP)][Plen Bins: 0,0,14,30,14,2,0,2,5,0,5,5,2,0,0,2,0,0,0,0,0,2,0,2,0,2,0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,7,0,0]
2 TCP 192.168.12.156:37976 <-> 185.128.25.99:465 [proto: 159.426/OpenVPN.NordVPN][IP: 426/NordVPN][Encrypted][Confidence: DPI (aggressive)][FPC: 426/NordVPN, Confidence: IP address][DPI packets: 19][cat: VPN/2][29 pkts/7410 bytes <-> 31 pkts/9812 bytes][Goodput ratio: 74/79][1.73 sec][bytes ratio: -0.139 (Mixed)][IAT c2s/s2c min/avg/max/stddev: 0/0 66/26 1019/153 204/31][Pkt Len c2s/s2c min/avg/max/stddev: 66/66 256/317 1090/1514 256/424][Risk: ** Known Proto on Non Std Port **** Susp Entropy **** Obfuscated Traffic **][Risk Score: 160][Risk Info: Obfuscated OpenVPN / Entropy: 7.132 (Compressed Executable?) / Expected on port 1194][TCP Fingerprint: 2_64_65535_685ad951a756/Android][PLAIN TEXT (HrFTzP)][Plen Bins: 0,0,14,30,14,2,0,2,5,0,5,5,2,0,0,2,0,0,0,0,0,2,0,2,0,2,0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,7,0,0]
3 UDP 192.168.12.156:47128 <-> 149.102.238.108:1214 [proto: 159.426/OpenVPN.NordVPN][IP: 426/NordVPN][Encrypted][Confidence: DPI (aggressive)][FPC: 426/NordVPN, Confidence: IP address][DPI packets: 10][cat: VPN/2][19 pkts/3629 bytes <-> 11 pkts/6969 bytes][Goodput ratio: 78/93][1.26 sec][bytes ratio: -0.315 (Download)][IAT c2s/s2c min/avg/max/stddev: 0/0 78/132 1156/1023 278/337][Pkt Len c2s/s2c min/avg/max/stddev: 115/136 191/634 782/1158 153/438][Risk: ** Known Proto on Non Std Port **** Susp Entropy **** Obfuscated Traffic **][Risk Score: 160][Risk Info: Obfuscated OpenVPN / Entropy: 6.051 (Executable?) / Expected on port 1194][PLAIN TEXT (SFhAFI)][Plen Bins: 0,0,23,41,3,0,0,0,3,0,3,6,0,0,0,0,0,0,0,0,0,0,0,3,0,3,0,0,0,0,0,0,0,0,13,0,0,0,0,0,0,0,0,0,0,0,0,0]