mirror of
https://github.com/mandiant/capa-rules
synced 2026-06-08 15:41:20 +00:00
mr-tz
22 lines
846 B
YAML
22 lines
846 B
YAML
rule:
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meta:
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name: decode data using Base64 via WinAPI
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namespace: data-manipulation/encoding/base64
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authors:
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- michael.hunhoff@mandiant.com
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scopes:
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static: basic block
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dynamic: call
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att&ck:
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- Defense Evasion::Deobfuscate/Decode Files or Information [T1140]
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examples:
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- mimikatz.exe_:0x40D742
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features:
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- and:
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- or:
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# number: 0x0 = CRYPT_STRING_BASE64HEADER (with certificate beginning and ending headers), FPs too likely for 0
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- number: 0x1 = dwFlags=CRYPT_STRING_BASE64 # without headers
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- number: 0x6 = dwFlags=CRYPT_STRING_BASE64_ANY # tries: CRYPT_STRING_BASE64HEADER, CRYPT_STRING_BASE64
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- number: 0x7 = dwFlags=CRYPT_STRING_ANY # tries: CRYPT_STRING_BASE64HEADER, CRYPT_STRING_BASE64, CRYPT_STRING_BINARY
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- api: CryptStringToBinary
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