rule win_pay2key_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { e8???????? c645fc06 8b4d08 54 8b11 ff5204 8d8d74ffffff }
            // n = 7, score = 300
            //   e8????????           |                     
            //   c645fc06             | mov                 byte ptr [ebp - 4], 6
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   54                   | push                esp
            //   8b11                 | mov                 edx, dword ptr [ecx]
            //   ff5204               | call                dword ptr [edx + 4]
            //   8d8d74ffffff         | lea                 ecx, [ebp - 0x8c]

        $sequence_1 = { c745bc0f000000 c745b800000000 c645a800 e8???????? c645fc03 8d4dc0 6a02 }
            // n = 7, score = 300
            //   c745bc0f000000       | mov                 dword ptr [ebp - 0x44], 0xf
            //   c745b800000000       | mov                 dword ptr [ebp - 0x48], 0
            //   c645a800             | mov                 byte ptr [ebp - 0x58], 0
            //   e8????????           |                     
            //   c645fc03             | mov                 byte ptr [ebp - 4], 3
            //   8d4dc0               | lea                 ecx, [ebp - 0x40]
            //   6a02                 | push                2

        $sequence_2 = { ff7538 e8???????? 8b4df4 64890d00000000 59 5f 5e }
            // n = 7, score = 300
            //   ff7538               | push                dword ptr [ebp + 0x38]
            //   e8????????           |                     
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx
            //   59                   | pop                 ecx
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_3 = { c745fc00000000 8b0e 50 e8???????? c645fc02 8b08 85c9 }
            // n = 7, score = 300
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   8b0e                 | mov                 ecx, dword ptr [esi]
            //   50                   | push                eax
            //   e8????????           |                     
            //   c645fc02             | mov                 byte ptr [ebp - 4], 2
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   85c9                 | test                ecx, ecx

        $sequence_4 = { c7869400000000000000 5e 5d c20800 8b7008 57 8b7908 }
            // n = 7, score = 300
            //   c7869400000000000000     | mov    dword ptr [esi + 0x94], 0
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   c20800               | ret                 8
            //   8b7008               | mov                 esi, dword ptr [eax + 8]
            //   57                   | push                edi
            //   8b7908               | mov                 edi, dword ptr [ecx + 8]

        $sequence_5 = { e8???????? 83c408 8bf0 8d4520 3bc6 7432 8b4534 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8bf0                 | mov                 esi, eax
            //   8d4520               | lea                 eax, [ebp + 0x20]
            //   3bc6                 | cmp                 eax, esi
            //   7432                 | je                  0x34
            //   8b4534               | mov                 eax, dword ptr [ebp + 0x34]

        $sequence_6 = { ff750c ff7508 e8???????? 8bf0 8d4608 85c0 }
            // n = 6, score = 300
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   8d4608               | lea                 eax, [esi + 8]
            //   85c0                 | test                eax, eax

        $sequence_7 = { ffd7 85c0 7517 68a0000000 68???????? 68???????? e8???????? }
            // n = 7, score = 300
            //   ffd7                 | call                edi
            //   85c0                 | test                eax, eax
            //   7517                 | jne                 0x19
            //   68a0000000           | push                0xa0
            //   68????????           |                     
            //   68????????           |                     
            //   e8????????           |                     

        $sequence_8 = { ff7604 ff15???????? 6a0c 56 e8???????? 83c408 c787d400000000000000 }
            // n = 7, score = 300
            //   ff7604               | push                dword ptr [esi + 4]
            //   ff15????????         |                     
            //   6a0c                 | push                0xc
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   c787d400000000000000     | mov    dword ptr [edi + 0xd4], 0

        $sequence_9 = { 8d9798000000 83c40c 66c7041eabba 83c302 837a1410 7204 8b02 }
            // n = 7, score = 300
            //   8d9798000000         | lea                 edx, [edi + 0x98]
            //   83c40c               | add                 esp, 0xc
            //   66c7041eabba         | mov                 word ptr [esi + ebx], 0xbaab
            //   83c302               | add                 ebx, 2
            //   837a1410             | cmp                 dword ptr [edx + 0x14], 0x10
            //   7204                 | jb                  6
            //   8b02                 | mov                 eax, dword ptr [edx]

    condition:
        7 of them and filesize < 2252800
}