rule win_pay2key_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.pay2key."
        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.pay2key"
        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 = { 8d45f4 64a300000000 c745fc00000000 8b7110 85f6 7421 83cfff }
            // n = 7, score = 300
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   8b7110               | mov                 esi, dword ptr [ecx + 0x10]
            //   85f6                 | test                esi, esi
            //   7421                 | je                  0x23
            //   83cfff               | or                  edi, 0xffffffff

        $sequence_1 = { 8bf1 57 8b4604 85c0 7408 8b4004 }
            // n = 6, score = 300
            //   8bf1                 | mov                 esi, ecx
            //   57                   | push                edi
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   85c0                 | test                eax, eax
            //   7408                 | je                  0xa
            //   8b4004               | mov                 eax, dword ptr [eax + 4]

        $sequence_2 = { c74608???????? 8b4dfc b001 5f 33cd 5e e8???????? }
            // n = 7, score = 300
            //   c74608????????       |                     
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   b001                 | mov                 al, 1
            //   5f                   | pop                 edi
            //   33cd                 | xor                 ecx, ebp
            //   5e                   | pop                 esi
            //   e8????????           |                     

        $sequence_3 = { ff75ec ff15???????? 8d4d90 e8???????? 8b4df4 64890d00000000 }
            // n = 6, score = 300
            //   ff75ec               | push                dword ptr [ebp - 0x14]
            //   ff15????????         |                     
            //   8d4d90               | lea                 ecx, [ebp - 0x70]
            //   e8????????           |                     
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx

        $sequence_4 = { 8b01 eb02 8bc1 33d2 6aff 668910 8d85c4000000 }
            // n = 7, score = 300
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   eb02                 | jmp                 4
            //   8bc1                 | mov                 eax, ecx
            //   33d2                 | xor                 edx, edx
            //   6aff                 | push                -1
            //   668910               | mov                 word ptr [eax], dx
            //   8d85c4000000         | lea                 eax, [ebp + 0xc4]

        $sequence_5 = { 8b4d0c 8d45e4 50 e8???????? 8d4de4 c745fcffffffff }
            // n = 6, score = 300
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   8d45e4               | lea                 eax, [ebp - 0x1c]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d4de4               | lea                 ecx, [ebp - 0x1c]
            //   c745fcffffffff       | mov                 dword ptr [ebp - 4], 0xffffffff

        $sequence_6 = { f30f7e00 660fd606 8b4008 894608 8b44241c 57 }
            // n = 6, score = 300
            //   f30f7e00             | movq                xmm0, qword ptr [eax]
            //   660fd606             | movq                qword ptr [esi], xmm0
            //   8b4008               | mov                 eax, dword ptr [eax + 8]
            //   894608               | mov                 dword ptr [esi + 8], eax
            //   8b44241c             | mov                 eax, dword ptr [esp + 0x1c]
            //   57                   | push                edi

        $sequence_7 = { eba9 807f0c00 740c 53 8bcf c6470c00 e8???????? }
            // n = 7, score = 300
            //   eba9                 | jmp                 0xffffffab
            //   807f0c00             | cmp                 byte ptr [edi + 0xc], 0
            //   740c                 | je                  0xe
            //   53                   | push                ebx
            //   8bcf                 | mov                 ecx, edi
            //   c6470c00             | mov                 byte ptr [edi + 0xc], 0
            //   e8????????           |                     

        $sequence_8 = { e8???????? 84c0 7520 8b4d0c 8d45e4 50 e8???????? }
            // n = 7, score = 300
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   7520                 | jne                 0x22
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   8d45e4               | lea                 eax, [ebp - 0x1c]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_9 = { 8b32 8975f0 85db 7404 f0ff4304 8b7704 }
            // n = 6, score = 300
            //   8b32                 | mov                 esi, dword ptr [edx]
            //   8975f0               | mov                 dword ptr [ebp - 0x10], esi
            //   85db                 | test                ebx, ebx
            //   7404                 | je                  6
            //   f0ff4304             | lock inc            dword ptr [ebx + 4]
            //   8b7704               | mov                 esi, dword ptr [edi + 4]

    condition:
        7 of them and filesize < 2252800
}