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Add socks5 proxy capabilities rule #1038

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Add socks5 proxy capabilities rule #1038

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f7abd84
Add socks5b proxy capabilities rule
ArkaprabhaChakraborty Mar 25, 2025
7b2618d
Update rule with comments
ArkaprabhaChakraborty Mar 26, 2025
4bff089
Fix feature block lint
ArkaprabhaChakraborty Mar 26, 2025
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172 changes: 172 additions & 0 deletions nursery/socks-communication.yml
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Original file line number Diff line number Diff line change
@@ -0,0 +1,172 @@
rule:
meta:
name: detect socks incoming connection requests
namespace: load-code
authors:
- chakrabortyarkaprabha998@gmail.com
scopes:
static: basic block
dynamic: unsupported
references:
- https://github.com/rofl0r/microsocks
features:
- and:
- os: linux
- and:
# Check socksv5 handshake
- basic block:
# Check first entry for version (VER)
- and:
- mnemonic: mov
- mnemonic: movzx
- offset: 0x0
- operand[1].offset: 0x0
- mnemonic: cmp
- number: 0x5 # socks version
- operand[1].number: 0x5
- basic block:
# Check second entry for command code (CMD)
- or:
- and:
- mnemonic: mov
- mnemonic: add
- number: 0x1
- operand[1].number: 0x1
- offset: 0x1
- operand[1].offset: 0x1
- mnemonic: movzx
- offset: 0x0
- operand[1].offset: 0x0
- mnemonic: cmp
- number: 0x1 # TCP-IP Stream
- operand[1].number: 0x1
- and:
- mnemonic: mov
- mnemonic: add
- number: 0x1
- operand[1].number: 0x1
- offset: 0x1
- operand[1].offset: 0x1
- mnemonic: movzx
- offset: 0x0
- operand[1].offset: 0x0
- mnemonic: cmp
- number: 0x2 # TCP-IP Port Bind
- operand[1].number: 0x2
- and:
- mnemonic: mov
- mnemonic: add
- number: 0x1
- operand[1].number: 0x1
- offset: 0x1
- operand[1].offset: 0x1
- mnemonic: movzx
- offset: 0x0
- operand[1].offset: 0x0
- mnemonic: cmp
- number: 0x3 # Establish UDP Port
- operand[1].number: 0x3
# Check third entry for reserved (RSV)
- basic block:
- and:
- mnemonic: mov
- mnemonic: add
- number: 0x2
- operand[1].number: 0x2
- offset: 0x2
- operand[1].offset: 0x2
- mnemonic: movzx
- offset: 0x0 # RSV Value should be 0x00
- operand[1].offset: 0x0
- mnemonic: test
- basic block:
# AF_INET and a Minimum length 10
- and:
- mnemonic: mov
- number: 0x2
- operand[1].number: 0x2
- and:
- mnemonic: mov
- number: 0xA
- operand[1].number: 0xA
# Check TYPE
- and:
- mnemonic: mov
- mnemonic: add
- number: 0x3
- operand[1].number: 0x3
- offset: 0x3
- operand[1].offset: 0x3
- mnemonic: movzx
- offset: 0x0
- operand[1].offset: 0x0
- mnemonic: movzx
- and:
- or:
- and:
- mnemonic: cmp
- number: 0x4 # IPv6
- operand[1].number: 0x4
- basic block:
- mnemonic: mov
- number: 0xA # AF_INET6
- operand[1].number: 0xA
- mnemonic: mov
- number: 0x16
- operand[1].number: 0x16 # Change minimum length to accommodate for IPv6 Address
- basic block:
- api: inet_ntop
- mnemonic: call
- characteristic: (calls from) -> 0x20022D0
- and:
- mnemonic: cmp
- number: 0x1 #IPv4
- operand[1].number: 0x1
- basic block:
- api: inet_ntop
- mnemonic: call
- characteristic: (calls from) -> 0x20022D0
- and:
- mnemonic: cmp
- number: 0x3 #DNS_NAME
- operand[1].number: 0x3
- basic block:
- mnemonic: mov
- mnemonic: add
- number: 0x4
- operand[1].number: 0x4
- offset: 0x4
- operand[1].offset: 0x4
- mnemonic: movzx
- offset: 0x0
- operand[1].offset: 0x0
- mnemonic: movzx
- mnemonic: mov
- mnemonic: mov
- mnemonic: add
- number: 0x7
- operand[1].number: 0x7
- offset: 0x7
- operand[1].offset: 0x7
- mnemonic: mov
- mnemonic: mov
- mnemonic: add
- number: 0x7
- operand[1].number: 0x7
- offset: 0x7
- operand[1].offset: 0x7
- mnemonic: cmp
# Socket call block
- basic block:
- and:
- mnemonic: mov
- offset: 0x10
- operand[1].offset: 0x10
- mnemonic: mov
- offset: 0x18
- operand[1].offset: 0x18
- mnemonic: mov
- api: connect
- mnemonic: call
- characteristic: (calls from) -> 0x20024E0