rule win_milkmaid_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.milkmaid."
        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.milkmaid"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 6a1a 6a00 ff15???????? 6aff }
            // n = 4, score = 100
            //   6a1a                 | push                0x1a
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   6aff                 | push                -1

        $sequence_1 = { 53 6801100000 51 8d4c2420 c68424e828010001 e8???????? 85c0 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   6801100000           | push                0x1001
            //   51                   | push                ecx
            //   8d4c2420             | lea                 ecx, [esp + 0x20]
            //   c68424e828010001     | mov                 byte ptr [esp + 0x128e8], 1
            //   e8????????           |                     
            //   85c0                 | test                eax, eax

        $sequence_2 = { 81e1ff0f0000 33db 84c0 8a5c2918 895c2428 }
            // n = 5, score = 100
            //   81e1ff0f0000         | and                 ecx, 0xfff
            //   33db                 | xor                 ebx, ebx
            //   84c0                 | test                al, al
            //   8a5c2918             | mov                 bl, byte ptr [ecx + ebp + 0x18]
            //   895c2428             | mov                 dword ptr [esp + 0x28], ebx

        $sequence_3 = { 64a100000000 6aff 68???????? 50 b8c8280100 }
            // n = 5, score = 100
            //   64a100000000         | mov                 eax, dword ptr fs:[0]
            //   6aff                 | push                -1
            //   68????????           |                     
            //   50                   | push                eax
            //   b8c8280100           | mov                 eax, 0x128c8

        $sequence_4 = { 53 53 8d4c2434 89542454 }
            // n = 4, score = 100
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   8d4c2434             | lea                 ecx, [esp + 0x34]
            //   89542454             | mov                 dword ptr [esp + 0x54], edx

        $sequence_5 = { 7504 33d2 eb05 8b5708 2bd1 8b5c2428 }
            // n = 6, score = 100
            //   7504                 | jne                 6
            //   33d2                 | xor                 edx, edx
            //   eb05                 | jmp                 7
            //   8b5708               | mov                 edx, dword ptr [edi + 8]
            //   2bd1                 | sub                 edx, ecx
            //   8b5c2428             | mov                 ebx, dword ptr [esp + 0x28]

        $sequence_6 = { 6800010000 8d4c2408 c744241801000000 e8???????? 50 6a00 6a00 }
            // n = 7, score = 100
            //   6800010000           | push                0x100
            //   8d4c2408             | lea                 ecx, [esp + 8]
            //   c744241801000000     | mov                 dword ptr [esp + 0x18], 1
            //   e8????????           |                     
            //   50                   | push                eax
            //   6a00                 | push                0
            //   6a00                 | push                0

        $sequence_7 = { 8b8c24d4280100 5f 5e 5b 64890d00000000 }
            // n = 5, score = 100
            //   8b8c24d4280100       | mov                 ecx, dword ptr [esp + 0x128d4]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx

    condition:
        7 of them and filesize < 65536
}