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encrypt data using RC4 via SystemFunction032 #825

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merged 7 commits into from
Oct 10, 2023
Merged

encrypt data using RC4 via SystemFunction032 #825

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b1f39a3
RC4 encryption via Advapi32.SystemFunction032
richardweiss80 Sep 5, 2023
91351de
rule name and a few rule conventions
richardweiss80 Sep 5, 2023
3671acb
added example hash and changed rule content of the strings part
richardweiss80 Sep 6, 2023
90ed870
changed example of capa rule SystemFunction032
richardweiss80 Sep 11, 2023
bc8d5b7
recommended changes added and tested
richardweiss80 Sep 14, 2023
55f5496
added match of prior matching rule 'link function at runtime on Windo…
richardweiss80 Sep 15, 2023
b35f41d
Using optional instead of or
richardweiss80 Oct 9, 2023
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25 changes: 25 additions & 0 deletions nursery/encrypt-data-using-rc4-via-systemfunction032.yml
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rule:
meta:
name: encrypt data using RC4 via SystemFunction032
namespace: data-manipulation/encryption/rc4
authors:
- [email protected]
scope: function
att&ck:
- Defense Evasion::Obfuscated Files or Information [T1027]
mbc:
- Defense Evasion::Obfuscated Files or Information::Encryption-Standard Algorithm [E1027.m05]
- Cryptography::Encrypt Data::RC4 [C0027.009]
references:
- https://doxygen.reactos.org/df/d13/sysfunc_8c_source.html
- https://blog.gentilkiwi.com/tag/systemfunction032
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examples:
- 3BBDF04C25FCD9876733EAA9163B3ED64D81396E7414619758D9376EDF4C103E:0x1000976C # api match
features:
- or:
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- api: SystemFunction032
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- and:
- or:
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- string: /advapi32/i
- string: /cryptsp/i
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- string: "SystemFunction032"
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oh, one other idea: how about an optional: match: link function at runtime on Windows?

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Awesome idea, will add and test it

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