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feat: further improve trojan detection

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This commit is contained in:
Toby 2024-03-29 23:02:20 -07:00
parent b02738cde8
commit ca574393d3
1 changed files with 429 additions and 11 deletions
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440
analyzer/tcp/trojan.go
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@ -13,10 +13,11 @@ var ccsPattern = []byte{20, 3, 3, 0, 1, 1}
// TrojanAnalyzer uses length-based heuristics to detect Trojan traffic based on // TrojanAnalyzer uses length-based heuristics to detect Trojan traffic based on
// its "TLS-in-TLS" nature. The heuristics are trained using a decision tree with // its "TLS-in-TLS" nature. The heuristics are trained using a decision tree with
// about 2000 samples. This is highly experimental and is known to have significant // about 20k Trojan samples and 30k non-Trojan samples. The tree is then converted
// false positives (about 9% false positives & 3% false negatives). // to code using a custom tool and inlined here (isTrojanSeq function).
// We do NOT recommend directly blocking all positive connections, as this is likely // Accuracy: 1% false positive rate, 10% false negative rate.
// to break many normal TLS connections. // We do NOT recommend directly blocking all positive connections, as this may
// break legitimate TLS connections.
type TrojanAnalyzer struct{} type TrojanAnalyzer struct{}
func (a *TrojanAnalyzer) Name() string { func (a *TrojanAnalyzer) Name() string {
@ -36,7 +37,7 @@ type trojanStream struct {
first bool first bool
count bool count bool
rev bool rev bool
seq [3]int seq [4]int
seqIndex int seqIndex int
} }
@ -73,16 +74,12 @@ func (s *trojanStream) Feed(rev, start, end bool, skip int, data []byte) (u *ana
} else { } else {
// Different direction, bump the index // Different direction, bump the index
s.seqIndex += 1 s.seqIndex += 1
if s.seqIndex == 3 { if s.seqIndex == 4 {
// Time to evaluate
yes := s.seq[0] >= 180 &&
s.seq[1] <= 11000 &&
s.seq[2] >= 40
return &analyzer.PropUpdate{ return &analyzer.PropUpdate{
Type: analyzer.PropUpdateReplace, Type: analyzer.PropUpdateReplace,
M: analyzer.PropMap{ M: analyzer.PropMap{
"seq": s.seq, "seq": s.seq,
"yes": yes, "yes": isTrojanSeq(s.seq),
}, },
}, true }, true
} }
@ -97,3 +94,424 @@ func (s *trojanStream) Feed(rev, start, end bool, skip int, data []byte) (u *ana
func (s *trojanStream) Close(limited bool) *analyzer.PropUpdate { func (s *trojanStream) Close(limited bool) *analyzer.PropUpdate {
return nil return nil
} }
func isTrojanSeq(seq [4]int) bool {
length1 := seq[0]
length2 := seq[1]
length3 := seq[2]
length4 := seq[3]
if length2 <= 2431 {
if length2 <= 157 {
if length1 <= 156 {
if length3 <= 108 {
return false
} else {
return false
}
} else {
if length1 <= 892 {
if length3 <= 40 {
return false
} else {
if length3 <= 788 {
if length4 <= 185 {
if length1 <= 411 {
return true
} else {
return false
}
} else {
if length2 <= 112 {
return false
} else {
return true
}
}
} else {
if length3 <= 1346 {
if length1 <= 418 {
return false
} else {
return true
}
} else {
return false
}
}
}
} else {
if length2 <= 120 {
if length2 <= 63 {
return false
} else {
if length4 <= 653 {
return false
} else {
return false
}
}
} else {
return false
}
}
}
} else {
if length1 <= 206 {
if length1 <= 185 {
if length1 <= 171 {
return false
} else {
if length4 <= 211 {
return false
} else {
return false
}
}
} else {
if length2 <= 251 {
return true
} else {
return false
}
}
} else {
if length2 <= 286 {
if length1 <= 1123 {
if length3 <= 70 {
return false
} else {
if length1 <= 659 {
if length3 <= 370 {
return true
} else {
return false
}
} else {
if length4 <= 272 {
return false
} else {
return true
}
}
}
} else {
if length4 <= 537 {
if length2 <= 276 {
if length3 <= 1877 {
return false
} else {
return false
}
} else {
return false
}
} else {
if length1 <= 1466 {
if length1 <= 1435 {
return false
} else {
return true
}
} else {
if length2 <= 193 {
return false
} else {
return false
}
}
}
}
} else {
if length1 <= 284 {
if length1 <= 277 {
if length2 <= 726 {
return false
} else {
if length2 <= 768 {
return true
} else {
return false
}
}
} else {
if length2 <= 782 {
if length4 <= 783 {
return true
} else {
return false
}
} else {
return false
}
}
} else {
if length2 <= 492 {
if length2 <= 396 {
if length2 <= 322 {
return false
} else {
return false
}
} else {
if length4 <= 971 {
return false
} else {
return true
}
}
} else {
if length2 <= 2128 {
if length2 <= 1418 {
return false
} else {
return false
}
} else {
if length3 <= 103 {
return false
} else {
return false
}
}
}
}
}
}
}
} else {
if length2 <= 6232 {
if length3 <= 85 {
if length2 <= 3599 {
return false
} else {
if length1 <= 613 {
return false
} else {
return false
}
}
} else {
if length3 <= 220 {
if length4 <= 1173 {
if length1 <= 874 {
if length4 <= 337 {
if length4 <= 68 {
return true
} else {
return true
}
} else {
if length1 <= 667 {
return true
} else {
return true
}
}
} else {
if length3 <= 108 {
if length1 <= 1930 {
return true
} else {
return true
}
} else {
if length2 <= 5383 {
return false
} else {
return true
}
}
}
} else {
return false
}
} else {
if length1 <= 664 {
if length3 <= 411 {
if length3 <= 383 {
if length4 <= 346 {
return true
} else {
return false
}
} else {
if length1 <= 445 {
return true
} else {
return false
}
}
} else {
if length2 <= 3708 {
if length4 <= 307 {
return true
} else {
return false
}
} else {
if length2 <= 4656 {
return false
} else {
return false
}
}
}
} else {
if length1 <= 1055 {
if length3 <= 580 {
if length1 <= 724 {
return true
} else {
return false
}
} else {
if length1 <= 678 {
return false
} else {
return true
}
}
} else {
if length2 <= 5352 {
if length3 <= 1586 {
return false
} else {
return false
}
} else {
if length4 <= 2173 {
return true
} else {
return false
}
}
}
}
}
}
} else {
if length2 <= 9408 {
if length1 <= 670 {
if length4 <= 76 {
if length3 <= 175 {
return true
} else {
return true
}
} else {
if length2 <= 9072 {
if length3 <= 314 {
if length3 <= 179 {
return false
} else {
return false
}
} else {
if length4 <= 708 {
return false
} else {
return false
}
}
} else {
return true
}
}
} else {
if length1 <= 795 {
if length2 <= 6334 {
if length2 <= 6288 {
return true
} else {
return false
}
} else {
if length4 <= 6404 {
if length2 <= 8194 {
return true
} else {
return true
}
} else {
if length2 <= 8924 {
return false
} else {
return true
}
}
}
} else {
if length3 <= 732 {
if length1 <= 1397 {
if length3 <= 179 {
return false
} else {
return false
}
} else {
if length1 <= 1976 {
return false
} else {
return false
}
}
} else {
if length1 <= 2840 {
if length1 <= 2591 {
return false
} else {
return true
}
} else {
return false
}
}
}
}
} else {
if length4 <= 30 {
return false
} else {
if length2 <= 13314 {
if length4 <= 1786 {
if length2 <= 13018 {
if length4 <= 869 {
return false
} else {
return false
}
} else {
return true
}
} else {
if length3 <= 775 {
return false
} else {
return false
}
}
} else {
if length4 <= 73 {
return false
} else {
if length3 <= 640 {
if length3 <= 237 {
return false
} else {
return false
}
} else {
if length2 <= 43804 {
return false
} else {
return false
}
}
}
}
}
}
}
}
}