rule win_polpo_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.polpo."
        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.polpo"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { 83feff 7514 83c8ff 5e 8b4dfc 33cd e8???????? }
            // n = 7, score = 100
            //   83feff               | cmp                 esi, -1
            //   7514                 | jne                 0x16
            //   83c8ff               | or                  eax, 0xffffffff
            //   5e                   | pop                 esi
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   33cd                 | xor                 ecx, ebp
            //   e8????????           |                     

        $sequence_1 = { 8b0d???????? 50 51 c745e020000000 }
            // n = 4, score = 100
            //   8b0d????????         |                     
            //   50                   | push                eax
            //   51                   | push                ecx
            //   c745e020000000       | mov                 dword ptr [ebp - 0x20], 0x20

        $sequence_2 = { 33db 8d8dd6fdffff 33c0 53 51 }
            // n = 5, score = 100
            //   33db                 | xor                 ebx, ebx
            //   8d8dd6fdffff         | lea                 ecx, [ebp - 0x22a]
            //   33c0                 | xor                 eax, eax
            //   53                   | push                ebx
            //   51                   | push                ecx

        $sequence_3 = { 81ff00001000 0f8387000000 8b96b0080000 52 8d45bc }
            // n = 5, score = 100
            //   81ff00001000         | cmp                 edi, 0x100000
            //   0f8387000000         | jae                 0x8d
            //   8b96b0080000         | mov                 edx, dword ptr [esi + 0x8b0]
            //   52                   | push                edx
            //   8d45bc               | lea                 eax, [ebp - 0x44]

        $sequence_4 = { ffd6 85c0 8b859cfdffff 50 0f8516020000 }
            // n = 5, score = 100
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax
            //   8b859cfdffff         | mov                 eax, dword ptr [ebp - 0x264]
            //   50                   | push                eax
            //   0f8516020000         | jne                 0x21c

        $sequence_5 = { 64a100000000 50 81ec88090000 a1???????? 3145f8 33c5 8945e4 }
            // n = 7, score = 100
            //   64a100000000         | mov                 eax, dword ptr fs:[0]
            //   50                   | push                eax
            //   81ec88090000         | sub                 esp, 0x988
            //   a1????????           |                     
            //   3145f8               | xor                 dword ptr [ebp - 8], eax
            //   33c5                 | xor                 eax, ebp
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax

        $sequence_6 = { 8d041e 50 51 ff15???????? 85c0 0f8ec8000000 03d8 }
            // n = 7, score = 100
            //   8d041e               | lea                 eax, [esi + ebx]
            //   50                   | push                eax
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f8ec8000000         | jle                 0xce
            //   03d8                 | add                 ebx, eax

        $sequence_7 = { 50 ff15???????? 8b8614040000 50 ff15???????? 8b8600040000 85c0 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b8614040000         | mov                 eax, dword ptr [esi + 0x414]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b8600040000         | mov                 eax, dword ptr [esi + 0x400]
            //   85c0                 | test                eax, eax

        $sequence_8 = { 8d8dd6fdffff 33c0 53 51 89bdccfdffff 668985d4fdffff }
            // n = 6, score = 100
            //   8d8dd6fdffff         | lea                 ecx, [ebp - 0x22a]
            //   33c0                 | xor                 eax, eax
            //   53                   | push                ebx
            //   51                   | push                ecx
            //   89bdccfdffff         | mov                 dword ptr [ebp - 0x234], edi
            //   668985d4fdffff       | mov                 word ptr [ebp - 0x22c], ax

        $sequence_9 = { 7e46 8b7508 33c0 8d9b00000000 0fb60c86 880c83 0fb64c8601 }
            // n = 7, score = 100
            //   7e46                 | jle                 0x48
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   33c0                 | xor                 eax, eax
            //   8d9b00000000         | lea                 ebx, [ebx]
            //   0fb60c86             | movzx               ecx, byte ptr [esi + eax*4]
            //   880c83               | mov                 byte ptr [ebx + eax*4], cl
            //   0fb64c8601           | movzx               ecx, byte ptr [esi + eax*4 + 1]

    condition:
        7 of them and filesize < 250880
}