mirror of
https://github.com/mandiant/capa-rules
synced 2026-06-08 15:41:20 +00:00
Yacine Elhamer
42 lines
1.3 KiB
YAML
42 lines
1.3 KiB
YAML
rule:
|
|
meta:
|
|
name: encode data using Base64
|
|
namespace: data-manipulation/encoding/base64
|
|
authors:
|
|
- moritz.raabe@mandiant.com
|
|
- anushka.virgaonkar@mandiant.com
|
|
- michael.hunhoff@mandiant.com
|
|
scopes:
|
|
static: function
|
|
dynamic: process
|
|
att&ck:
|
|
- Defense Evasion::Obfuscated Files or Information [T1027]
|
|
mbc:
|
|
- Defense Evasion::Obfuscated Files or Information::Encoding-Standard Algorithm [E1027.m02]
|
|
- Data::Encode Data::Base64 [C0026.001]
|
|
examples:
|
|
- BFB9B5391A13D0AFD787E87AB90F14F5:0x1314889C
|
|
- 074072B261FC27B65C72671F13510C05:0x100049B2
|
|
- 5DB2D2BE20D59AA0BE6709A6850F1775:0x18001CC30
|
|
- 08AC667C65D36D6542917655571E61C8:0x406EAA
|
|
features:
|
|
- or:
|
|
- and:
|
|
- mnemonic: shl
|
|
- mnemonic: shr
|
|
- number: 0x3F = modulo 64
|
|
- or:
|
|
- number: 0x3D = '='
|
|
- number: 0x3D3D = '=='
|
|
- match: contain loop
|
|
- optional:
|
|
- number: 2
|
|
- number: 3
|
|
- number: 4
|
|
- number: 6
|
|
- number: 0xF
|
|
- string: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
|
|
- api: System.Convert::ToBase64String
|
|
- api: System.Convert::ToBase64CharArray
|
|
- api: System.Convert::TryToBase64Chars
|