rule win_pay2key_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 8d8de4feffff 50 ffb5e4feffff e8???????? 8b85e0feffff c785f8feffff0f000000 c785f4feffff00000000 }
            // n = 7, score = 300
            //   8d8de4feffff         | lea                 ecx, [ebp - 0x11c]
            //   50                   | push                eax
            //   ffb5e4feffff         | push                dword ptr [ebp - 0x11c]
            //   e8????????           |                     
            //   8b85e0feffff         | mov                 eax, dword ptr [ebp - 0x120]
            //   c785f8feffff0f000000     | mov    dword ptr [ebp - 0x108], 0xf
            //   c785f4feffff00000000     | mov    dword ptr [ebp - 0x10c], 0

        $sequence_1 = { c7420401000000 c7420801000000 c702???????? 85c9 7405 }
            // n = 5, score = 300
            //   c7420401000000       | mov                 dword ptr [edx + 4], 1
            //   c7420801000000       | mov                 dword ptr [edx + 8], 1
            //   c702????????         |                     
            //   85c9                 | test                ecx, ecx
            //   7405                 | je                  7

        $sequence_2 = { a1???????? 33c5 50 8d45f4 64a300000000 8b5d08 895dec }
            // n = 7, score = 300
            //   a1????????           |                     
            //   33c5                 | xor                 eax, ebp
            //   50                   | push                eax
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   8b5d08               | mov                 ebx, dword ptr [ebp + 8]
            //   895dec               | mov                 dword ptr [ebp - 0x14], ebx

        $sequence_3 = { e8???????? c787e400000000000000 c787e800000000000000 c787ec00000000000000 8b8fd8000000 85c9 }
            // n = 6, score = 300
            //   e8????????           |                     
            //   c787e400000000000000     | mov    dword ptr [edi + 0xe4], 0
            //   c787e800000000000000     | mov    dword ptr [edi + 0xe8], 0
            //   c787ec00000000000000     | mov    dword ptr [edi + 0xec], 0
            //   8b8fd8000000         | mov                 ecx, dword ptr [edi + 0xd8]
            //   85c9                 | test                ecx, ecx

        $sequence_4 = { e8???????? 8b4510 8b4d0c 0fb600 50 83ec0c 8bd4 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   0fb600               | movzx               eax, byte ptr [eax]
            //   50                   | push                eax
            //   83ec0c               | sub                 esp, 0xc
            //   8bd4                 | mov                 edx, esp

        $sequence_5 = { e8???????? 6a18 57 e8???????? 83c40c 5e }
            // n = 6, score = 300
            //   e8????????           |                     
            //   6a18                 | push                0x18
            //   57                   | push                edi
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   5e                   | pop                 esi

        $sequence_6 = { ff5008 c745fc01000000 8b1f 8b7708 83c604 837b0800 7517 }
            // n = 7, score = 300
            //   ff5008               | call                dword ptr [eax + 8]
            //   c745fc01000000       | mov                 dword ptr [ebp - 4], 1
            //   8b1f                 | mov                 ebx, dword ptr [edi]
            //   8b7708               | mov                 esi, dword ptr [edi + 8]
            //   83c604               | add                 esi, 4
            //   837b0800             | cmp                 dword ptr [ebx + 8], 0
            //   7517                 | jne                 0x19

        $sequence_7 = { 85f6 7436 c745fc00000000 8b7620 85f6 7421 83cbff }
            // n = 7, score = 300
            //   85f6                 | test                esi, esi
            //   7436                 | je                  0x38
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   8b7620               | mov                 esi, dword ptr [esi + 0x20]
            //   85f6                 | test                esi, esi
            //   7421                 | je                  0x23
            //   83cbff               | or                  ebx, 0xffffffff

        $sequence_8 = { e8???????? 8b8760050000 8db74c050000 83f810 720b 40 8bce }
            // n = 7, score = 300
            //   e8????????           |                     
            //   8b8760050000         | mov                 eax, dword ptr [edi + 0x560]
            //   8db74c050000         | lea                 esi, [edi + 0x54c]
            //   83f810               | cmp                 eax, 0x10
            //   720b                 | jb                  0xd
            //   40                   | inc                 eax
            //   8bce                 | mov                 ecx, esi

        $sequence_9 = { c60000 8d4520 6a00 50 e8???????? 6aff }
            // n = 6, score = 300
            //   c60000               | mov                 byte ptr [eax], 0
            //   8d4520               | lea                 eax, [ebp + 0x20]
            //   6a00                 | push                0
            //   50                   | push                eax
            //   e8????????           |                     
            //   6aff                 | push                -1

    condition:
        7 of them and filesize < 2252800
}