rule win_mimikatz_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.mimikatz."
        info = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.6.0"
        signator_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.mimikatz"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    /* DISCLAIMER
     * The strings used in this rule have been automatically selected from the
     * disassembly of memory dumps and unpacked files, using YARA-Signator.
     * The code and documentation is published here:
     * https://github.com/fxb-cocacoding/yara-signator
     * As Malpedia is used as data source, please note that for a given
     * number of families, only single samples are documented.
     * This likely impacts the degree of generalization these rules will offer.
     * Take the described generation method also into consideration when you
     * apply the rules in your use cases and assign them confidence levels.
     */


    strings:
        $sequence_0 = { 83f8ff 750e ff15???????? c7002a000000 }
            // n = 4, score = 300
            //   83f8ff               | cmp                 eax, -1
            //   750e                 | jne                 0x10
            //   ff15????????         |                     
            //   c7002a000000         | mov                 dword ptr [eax], 0x2a

        $sequence_1 = { f7f1 85d2 7406 2bca }
            // n = 4, score = 300
            //   f7f1                 | div                 ecx
            //   85d2                 | test                edx, edx
            //   7406                 | je                  8
            //   2bca                 | sub                 ecx, edx

        $sequence_2 = { 83f812 72f1 33c0 c3 }
            // n = 4, score = 200
            //   83f812               | cmp                 eax, 0x12
            //   72f1                 | jb                  0xfffffff3
            //   33c0                 | xor                 eax, eax
            //   c3                   | ret                 

        $sequence_3 = { c3 81f998000000 7410 81f996000000 7408 81f99b000000 }
            // n = 6, score = 200
            //   c3                   | ret                 
            //   81f998000000         | cmp                 ecx, 0x98
            //   7410                 | je                  0x12
            //   81f996000000         | cmp                 ecx, 0x96
            //   7408                 | je                  0xa
            //   81f99b000000         | cmp                 ecx, 0x9b

        $sequence_4 = { f6c320 740f 83f809 7c05 }
            // n = 4, score = 200
            //   f6c320               | test                bl, 0x20
            //   740f                 | je                  0x11
            //   83f809               | cmp                 eax, 9
            //   7c05                 | jl                  7

        $sequence_5 = { f6c320 7413 6683f809 7206 }
            // n = 4, score = 200
            //   f6c320               | test                bl, 0x20
            //   7413                 | je                  0x15
            //   6683f809             | cmp                 ax, 9
            //   7206                 | jb                  8

        $sequence_6 = { 66894108 33c0 39410c 740b }
            // n = 4, score = 200
            //   66894108             | mov                 word ptr [ecx + 8], ax
            //   33c0                 | xor                 eax, eax
            //   39410c               | cmp                 dword ptr [ecx + 0xc], eax
            //   740b                 | je                  0xd

        $sequence_7 = { 6683f83f 7607 32c0 e9???????? }
            // n = 4, score = 200
            //   6683f83f             | cmp                 ax, 0x3f
            //   7607                 | jbe                 9
            //   32c0                 | xor                 al, al
            //   e9????????           |                     

        $sequence_8 = { e9???????? bd64000000 83ff2d 0f853c040000 c644245c01 }
            // n = 5, score = 200
            //   e9????????           |                     
            //   bd64000000           | mov                 ebp, 0x64
            //   83ff2d               | cmp                 edi, 0x2d
            //   0f853c040000         | jne                 0x442
            //   c644245c01           | mov                 byte ptr [esp + 0x5c], 1

        $sequence_9 = { ff15???????? be00000400 8bc8 8bd6 }
            // n = 4, score = 200
            //   ff15????????         |                     
            //   be00000400           | mov                 esi, 0x40000
            //   8bc8                 | mov                 ecx, eax
            //   8bd6                 | mov                 edx, esi

        $sequence_10 = { ff5048 8bd8 85c0 7837 }
            // n = 4, score = 200
            //   ff5048               | call                dword ptr [eax + 0x48]
            //   8bd8                 | mov                 ebx, eax
            //   85c0                 | test                eax, eax
            //   7837                 | js                  0x39

        $sequence_11 = { 2bc1 85c9 7403 83c008 }
            // n = 4, score = 200
            //   2bc1                 | sub                 eax, ecx
            //   85c9                 | test                ecx, ecx
            //   7403                 | je                  5
            //   83c008               | add                 eax, 8

        $sequence_12 = { 3c02 7207 e8???????? eb10 }
            // n = 4, score = 200
            //   3c02                 | cmp                 al, 2
            //   7207                 | jb                  9
            //   e8????????           |                     
            //   eb10                 | jmp                 0x12

        $sequence_13 = { ff15???????? bd6f000000 3bc3 7405 }
            // n = 4, score = 200
            //   ff15????????         |                     
            //   bd6f000000           | mov                 ebp, 0x6f
            //   3bc3                 | cmp                 eax, ebx
            //   7405                 | je                  7

        $sequence_14 = { 8d4d08 8d0437 51 50 e8???????? 83c40c }
            // n = 6, score = 100
            //   8d4d08               | lea                 ecx, [ebp + 8]
            //   8d0437               | lea                 eax, [edi + esi]
            //   51                   | push                ecx
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc

        $sequence_15 = { 33c9 3b04cd08d04600 7413 41 83f92d }
            // n = 5, score = 100
            //   33c9                 | xor                 ecx, ecx
            //   3b04cd08d04600       | cmp                 eax, dword ptr [ecx*8 + 0x46d008]
            //   7413                 | je                  0x15
            //   41                   | inc                 ecx
            //   83f92d               | cmp                 ecx, 0x2d

        $sequence_16 = { 40 8945f4 83fb04 7561 33db 90 }
            // n = 6, score = 100
            //   40                   | inc                 eax
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   83fb04               | cmp                 ebx, 4
            //   7561                 | jne                 0x63
            //   33db                 | xor                 ebx, ebx
            //   90                   | nop                 

        $sequence_17 = { e8???????? 8bc8 8b4508 ba???????? 2aca }
            // n = 5, score = 100
            //   e8????????           |                     
            //   8bc8                 | mov                 ecx, eax
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   ba????????           |                     
            //   2aca                 | sub                 cl, dl

        $sequence_18 = { 8d04453cdb4600 8bc8 2bce 6a03 d1f9 68???????? }
            // n = 6, score = 100
            //   8d04453cdb4600       | lea                 eax, [eax*2 + 0x46db3c]
            //   8bc8                 | mov                 ecx, eax
            //   2bce                 | sub                 ecx, esi
            //   6a03                 | push                3
            //   d1f9                 | sar                 ecx, 1
            //   68????????           |                     

        $sequence_19 = { 99 83ec0c 53 83e203 }
            // n = 4, score = 100
            //   99                   | cdq                 
            //   83ec0c               | sub                 esp, 0xc
            //   53                   | push                ebx
            //   83e203               | and                 edx, 3

        $sequence_20 = { c1e80d 8d4dd8 83e001 51 894614 c7461ce0164000 }
            // n = 6, score = 100
            //   c1e80d               | shr                 eax, 0xd
            //   8d4dd8               | lea                 ecx, [ebp - 0x28]
            //   83e001               | and                 eax, 1
            //   51                   | push                ecx
            //   894614               | mov                 dword ptr [esi + 0x14], eax
            //   c7461ce0164000       | mov                 dword ptr [esi + 0x1c], 0x4016e0

        $sequence_21 = { 8b5dd0 ebab c745e424714000 817de428714000 7311 8b45e4 8b00 }
            // n = 7, score = 100
            //   8b5dd0               | mov                 ebx, dword ptr [ebp - 0x30]
            //   ebab                 | jmp                 0xffffffad
            //   c745e424714000       | mov                 dword ptr [ebp - 0x1c], 0x407124
            //   817de428714000       | cmp                 dword ptr [ebp - 0x1c], 0x407128
            //   7311                 | jae                 0x13
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   8b00                 | mov                 eax, dword ptr [eax]

    condition:
        7 of them and filesize < 1642496
}

/*	Benjamin DELPY `gentilkiwi`
	http://blog.gentilkiwi.com
	benjamin@gentilkiwi.com
	Licence : https://creativecommons.org/licenses/by/4.0/
*/
rule win_mimikatz_w0 {
	meta:
		description		= "mimikatz"
		author			= "Benjamin DELPY (gentilkiwi)"
		tool_author		= "Benjamin DELPY (gentilkiwi)"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.mimikatz"
        malpedia_version = "20171230"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

	strings:
		$exe_x86_1		= { 89 71 04 89 [0-3] 30 8d 04 bd }
		$exe_x86_2		= { 8b 4d e? 8b 45 f4 89 75 e? 89 01 85 ff 74 }
		
		$exe_x64_1		= { 33 ff 4? 89 37 4? 8b f3 45 85 c? 74}
		$exe_x64_2		= { 4c 8b df 49 [0-3] c1 e3 04 48 [0-3] 8b cb 4c 03 [0-3] d8 }

		$dll_1			= { c7 0? 00 00 01 00 [4-14] c7 0? 01 00 00 00 }
		$dll_2			= { c7 0? 10 02 00 00 ?? 89 4? }
		
		$sys_x86		= { a0 00 00 00 24 02 00 00 40 00 00 00 [0-4] b8 00 00 00 6c 02 00 00 40 00 00 00 }
		$sys_x64		= { 88 01 00 00 3c 04 00 00 40 00 00 00 [0-4] e8 02 00 00 f8 02 00 00 40 00 00 00 }

	condition:
		(all of ($exe_x86_*)) or (all of ($exe_x64_*)) or (all of ($dll_*)) or (any of ($sys_*))
}