rule win_pirpi_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.pirpi."
        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.pirpi"
        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 = { ffd7 8bd8 83c408 85db 7515 68???????? 50 }
            // n = 7, score = 200
            //   ffd7                 | call                edi
            //   8bd8                 | mov                 ebx, eax
            //   83c408               | add                 esp, 8
            //   85db                 | test                ebx, ebx
            //   7515                 | jne                 0x17
            //   68????????           |                     
            //   50                   | push                eax

        $sequence_1 = { 3beb 7517 ff15???????? 5e 5d 895c2408 8bc3 }
            // n = 7, score = 200
            //   3beb                 | cmp                 ebp, ebx
            //   7517                 | jne                 0x19
            //   ff15????????         |                     
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   895c2408             | mov                 dword ptr [esp + 8], ebx
            //   8bc3                 | mov                 eax, ebx

        $sequence_2 = { 56 8bf1 8b4c2408 85c9 7430 8b44240c 85c0 }
            // n = 7, score = 200
            //   56                   | push                esi
            //   8bf1                 | mov                 esi, ecx
            //   8b4c2408             | mov                 ecx, dword ptr [esp + 8]
            //   85c9                 | test                ecx, ecx
            //   7430                 | je                  0x32
            //   8b44240c             | mov                 eax, dword ptr [esp + 0xc]
            //   85c0                 | test                eax, eax

        $sequence_3 = { 50 b856555555 668954241a f7e9 8bca 8b8424b81a0000 c1e91f }
            // n = 7, score = 200
            //   50                   | push                eax
            //   b856555555           | mov                 eax, 0x55555556
            //   668954241a           | mov                 word ptr [esp + 0x1a], dx
            //   f7e9                 | imul                ecx
            //   8bca                 | mov                 ecx, edx
            //   8b8424b81a0000       | mov                 eax, dword ptr [esp + 0x1ab8]
            //   c1e91f               | shr                 ecx, 0x1f

        $sequence_4 = { 81c444010000 c3 8b842454010000 85c0 7406 c70000000000 }
            // n = 6, score = 200
            //   81c444010000         | add                 esp, 0x144
            //   c3                   | ret                 
            //   8b842454010000       | mov                 eax, dword ptr [esp + 0x154]
            //   85c0                 | test                eax, eax
            //   7406                 | je                  8
            //   c70000000000         | mov                 dword ptr [eax], 0

        $sequence_5 = { 50 ff15???????? 83c408 8bce e8???????? 8b4c240c }
            // n = 6, score = 200
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83c408               | add                 esp, 8
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   8b4c240c             | mov                 ecx, dword ptr [esp + 0xc]

        $sequence_6 = { 03d0 81e23f000080 7905 4a 83cac0 42 52 }
            // n = 7, score = 200
            //   03d0                 | add                 edx, eax
            //   81e23f000080         | and                 edx, 0x8000003f
            //   7905                 | jns                 7
            //   4a                   | dec                 edx
            //   83cac0               | or                  edx, 0xffffffc0
            //   42                   | inc                 edx
            //   52                   | push                edx

        $sequence_7 = { 3ac8 7406 32c8 884c1420 42 }
            // n = 5, score = 200
            //   3ac8                 | cmp                 cl, al
            //   7406                 | je                  8
            //   32c8                 | xor                 cl, al
            //   884c1420             | mov                 byte ptr [esp + edx + 0x20], cl
            //   42                   | inc                 edx

        $sequence_8 = { 46 83c710 83fe06 72d4 8b8424ec000000 03c3 8a00 }
            // n = 7, score = 200
            //   46                   | inc                 esi
            //   83c710               | add                 edi, 0x10
            //   83fe06               | cmp                 esi, 6
            //   72d4                 | jb                  0xffffffd6
            //   8b8424ec000000       | mov                 eax, dword ptr [esp + 0xec]
            //   03c3                 | add                 eax, ebx
            //   8a00                 | mov                 al, byte ptr [eax]

        $sequence_9 = { 8b44241c 8d542420 52 50 e8???????? 85c0 7412 }
            // n = 7, score = 200
            //   8b44241c             | mov                 eax, dword ptr [esp + 0x1c]
            //   8d542420             | lea                 edx, dword ptr [esp + 0x20]
            //   52                   | push                edx
            //   50                   | push                eax
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7412                 | je                  0x14

    condition:
        7 of them and filesize < 327680
}