mirror of
https://github.com/mandiant/capa-rules
synced 2026-06-08 15:41:20 +00:00
mr-tz
30 lines
1.5 KiB
YAML
30 lines
1.5 KiB
YAML
rule:
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meta:
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name: encode data using Base64 via WinAPI
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namespace: data-manipulation/encoding/base64
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authors:
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- moritz.raabe@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::Obfuscated Files or Information [T1027]
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examples:
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- mimikatz.exe_:0x40622D
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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: 0x3 = dwFlags=CRYPT_STRING_BASE64REQUESTHEADER # with request beginning and ending headers
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- number: 0x9 = dwFlags=CRYPT_STRING_BASE64X509CRLHEADER # with X.509 CRL beginning and ending headers
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# CRYPT_STRING_NOCRLF = 0x40000000, do not append any new line characters to the encoded string
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- number: 0x40000001 = dwFlags=CRYPT_STRING_BASE64 | CRYPT_STRING_NOCRLF
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- number: 0x40000003 = dwFlags=CRYPT_STRING_BASE64REQUESTHEADER | CRYPT_STRING_NOCRLF
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- number: 0x40000009 = dwFlags=CRYPT_STRING_BASE64X509CRLHEADER | CRYPT_STRING_NOCRLF
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# CRYPT_STRING_NOCR = 0x80000000, only use the line feed (LF) character
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- number: 0x80000001 = dwFlags=CRYPT_STRING_BASE64 | CRYPT_STRING_NOCR
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- number: 0x80000003 = dwFlags=CRYPT_STRING_BASE64REQUESTHEADER | CRYPT_STRING_NOCR
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- number: 0x80000009 = dwFlags=CRYPT_STRING_BASE64X509CRLHEADER | CRYPT_STRING_NOCR
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- api: CryptBinaryToString
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