rule win_pay2key_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        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 = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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 = { 33c9 668908 898f88030000 898f8c030000 898f90030000 8d8f94030000 e8???????? }
            // n = 7, score = 300
            //   33c9                 | xor                 ecx, ecx
            //   668908               | mov                 word ptr [eax], cx
            //   898f88030000         | mov                 dword ptr [edi + 0x388], ecx
            //   898f8c030000         | mov                 dword ptr [edi + 0x38c], ecx
            //   898f90030000         | mov                 dword ptr [edi + 0x390], ecx
            //   8d8f94030000         | lea                 ecx, dword ptr [edi + 0x394]
            //   e8????????           |                     

        $sequence_1 = { 6a00 894604 ffd7 894608 6a00 68ffffff7f 85c0 }
            // n = 7, score = 300
            //   6a00                 | push                0
            //   894604               | mov                 dword ptr [esi + 4], eax
            //   ffd7                 | call                edi
            //   894608               | mov                 dword ptr [esi + 8], eax
            //   6a00                 | push                0
            //   68ffffff7f           | push                0x7fffffff
            //   85c0                 | test                eax, eax

        $sequence_2 = { 85db 7414 83ec0c 8bcc ff75f0 e8???????? 8bcb }
            // n = 7, score = 300
            //   85db                 | test                ebx, ebx
            //   7414                 | je                  0x16
            //   83ec0c               | sub                 esp, 0xc
            //   8bcc                 | mov                 ecx, esp
            //   ff75f0               | push                dword ptr [ebp - 0x10]
            //   e8????????           |                     
            //   8bcb                 | mov                 ecx, ebx

        $sequence_3 = { c60100 8d4d74 6a00 51 8d4f70 e8???????? 8d8788000000 }
            // n = 7, score = 300
            //   c60100               | mov                 byte ptr [ecx], 0
            //   8d4d74               | lea                 ecx, dword ptr [ebp + 0x74]
            //   6a00                 | push                0
            //   51                   | push                ecx
            //   8d4f70               | lea                 ecx, dword ptr [edi + 0x70]
            //   e8????????           |                     
            //   8d8788000000         | lea                 eax, dword ptr [edi + 0x88]

        $sequence_4 = { f00fc14608 7507 8b06 8bce ff5004 8b4dec 8b45f0 }
            // n = 7, score = 300
            //   f00fc14608           | lock xadd           dword ptr [esi + 8], eax
            //   7507                 | jne                 9
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   8bce                 | mov                 ecx, esi
            //   ff5004               | call                dword ptr [eax + 4]
            //   8b4dec               | mov                 ecx, dword ptr [ebp - 0x14]
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]

        $sequence_5 = { 83c10c e9???????? e8???????? c3 8b4dd4 83c114 e9???????? }
            // n = 7, score = 300
            //   83c10c               | add                 ecx, 0xc
            //   e9????????           |                     
            //   e8????????           |                     
            //   c3                   | ret                 
            //   8b4dd4               | mov                 ecx, dword ptr [ebp - 0x2c]
            //   83c114               | add                 ecx, 0x14
            //   e9????????           |                     

        $sequence_6 = { 8d4d20 e8???????? 32c0 eb16 b8???????? c3 8d4d08 }
            // n = 7, score = 300
            //   8d4d20               | lea                 ecx, dword ptr [ebp + 0x20]
            //   e8????????           |                     
            //   32c0                 | xor                 al, al
            //   eb16                 | jmp                 0x18
            //   b8????????           |                     
            //   c3                   | ret                 
            //   8d4d08               | lea                 ecx, dword ptr [ebp + 8]

        $sequence_7 = { c7461000000000 7202 8b36 33c0 668906 8db758030000 8b4614 }
            // n = 7, score = 300
            //   c7461000000000       | mov                 dword ptr [esi + 0x10], 0
            //   7202                 | jb                  4
            //   8b36                 | mov                 esi, dword ptr [esi]
            //   33c0                 | xor                 eax, eax
            //   668906               | mov                 word ptr [esi], ax
            //   8db758030000         | lea                 esi, dword ptr [edi + 0x358]
            //   8b4614               | mov                 eax, dword ptr [esi + 0x14]

        $sequence_8 = { ff75f0 51 51 e8???????? 83c410 8b4df4 64890d00000000 }
            // n = 7, score = 300
            //   ff75f0               | push                dword ptr [ebp - 0x10]
            //   51                   | push                ecx
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx

        $sequence_9 = { c745d000000000 c745d40f000000 83fb10 720f 8d4301 50 }
            // n = 6, score = 300
            //   c745d000000000       | mov                 dword ptr [ebp - 0x30], 0
            //   c745d40f000000       | mov                 dword ptr [ebp - 0x2c], 0xf
            //   83fb10               | cmp                 ebx, 0x10
            //   720f                 | jb                  0x11
            //   8d4301               | lea                 eax, dword ptr [ebx + 1]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 2252800
}