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Update README to showcase dynamic rules #859

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Dec 13, 2023
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Update README to showcase dynamic rules #859

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46 changes: 29 additions & 17 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -25,31 +25,43 @@ Here's an example of a capa rule:
```yaml
rule:
meta:
name: hash data with CRC32
namespace: data-manipulation/checksum/crc32
name: create reverse shell
namespace: communication/c2/shell
authors:
- [email protected]
scope: function
scopes:
static: function
dynamic: thread
att&ck:
- Execution::Command and Scripting Interpreter::Windows Command Shell [T1059.003]
mbc:
- Data::Checksum::CRC32 [C0032.001]
- Impact::Remote Access::Reverse Shell [B0022.001]
examples:
- 2D3EDC218A90F03089CC01715A9F047F:0x403CBD
- 7D28CB106CB54876B2A5C111724A07CD:0x402350 # RtlComputeCrc32
- 7EFF498DE13CC734262F87E6B3EF38AB:0x100084A6
- C91887D861D9BD4A5872249B641BC9F9:0x401A77
features:
- or:
- and:
- mnemonic: shr
- or:
- number: 0xEDB88320
- bytes: 00 00 00 00 96 30 07 77 2C 61 0E EE BA 51 09 99 19 C4 6D 07 8F F4 6A 70 35 A5 63 E9 A3 95 64 9E = crc32_tab
- number: 8
- characteristic: nzxor
- match: create pipe
- api: kernel32.PeekNamedPipe
- api: kernel32.CreateProcess
- api: kernel32.ReadFile
- api: kernel32.WriteFile
- and:
- match: host-interaction/process/create
- match: read pipe
- match: write pipe
- and:
- number: 0x8320
- number: 0xEDB8
- characteristic: nzxor
- api: RtlComputeCrc32
- match: create pipe
- match: host-interaction/process/create
- or:
- basic block:
- and:
- count(api(SetHandleInformation)): 2 or more
- number: 1 = HANDLE_FLAG_INHERIT
- call:
- and:
- count(api(SetHandleInformation)): 2 or more
- number: 1 = HANDLE_FLAG_INHERIT
```

capa interpets the content of these rules as it inspects executable files.
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