rule win_polpo_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        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 = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { 7ceb 6a00 8d855cebffff 50 56 8d8d64ebffff 51 }
            // n = 7, score = 100
            //   7ceb                 | jl                  0xffffffed
            //   6a00                 | push                0
            //   8d855cebffff         | lea                 eax, [ebp - 0x14a4]
            //   50                   | push                eax
            //   56                   | push                esi
            //   8d8d64ebffff         | lea                 ecx, [ebp - 0x149c]
            //   51                   | push                ecx

        $sequence_1 = { e8???????? 894610 8d45bc 50 8bcf e8???????? 8b4f08 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   894610               | mov                 dword ptr [esi + 0x10], eax
            //   8d45bc               | lea                 eax, [ebp - 0x44]
            //   50                   | push                eax
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     
            //   8b4f08               | mov                 ecx, dword ptr [edi + 8]

        $sequence_2 = { 83feff 0f8442010000 6800040000 8d8decfbffff 6a00 51 e8???????? }
            // n = 7, score = 100
            //   83feff               | cmp                 esi, -1
            //   0f8442010000         | je                  0x148
            //   6800040000           | push                0x400
            //   8d8decfbffff         | lea                 ecx, [ebp - 0x414]
            //   6a00                 | push                0
            //   51                   | push                ecx
            //   e8????????           |                     

        $sequence_3 = { 85ff 7527 8b4db8 51 }
            // n = 4, score = 100
            //   85ff                 | test                edi, edi
            //   7527                 | jne                 0x29
            //   8b4db8               | mov                 ecx, dword ptr [ebp - 0x48]
            //   51                   | push                ecx

        $sequence_4 = { 8d85e8f7ffff 50 8d8decf7ffff 51 c785e8f7ffff00000000 e8???????? 6800040000 }
            // n = 7, score = 100
            //   8d85e8f7ffff         | lea                 eax, [ebp - 0x818]
            //   50                   | push                eax
            //   8d8decf7ffff         | lea                 ecx, [ebp - 0x814]
            //   51                   | push                ecx
            //   c785e8f7ffff00000000     | mov    dword ptr [ebp - 0x818], 0
            //   e8????????           |                     
            //   6800040000           | push                0x400

        $sequence_5 = { 68???????? e8???????? 8bf0 83c41c 83feff 0f8413ffffff 6a00 }
            // n = 7, score = 100
            //   68????????           |                     
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   83c41c               | add                 esp, 0x1c
            //   83feff               | cmp                 esi, -1
            //   0f8413ffffff         | je                  0xffffff19
            //   6a00                 | push                0

        $sequence_6 = { 668945e9 8845eb c745f450726f78 c645f879 }
            // n = 4, score = 100
            //   668945e9             | mov                 word ptr [ebp - 0x17], ax
            //   8845eb               | mov                 byte ptr [ebp - 0x15], al
            //   c745f450726f78       | mov                 dword ptr [ebp - 0xc], 0x786f7250
            //   c645f879             | mov                 byte ptr [ebp - 8], 0x79

        $sequence_7 = { 8d951ee7ffff 33c9 57 52 66898d1ce7ffff e8???????? 83c40c }
            // n = 7, score = 100
            //   8d951ee7ffff         | lea                 edx, [ebp - 0x18e2]
            //   33c9                 | xor                 ecx, ecx
            //   57                   | push                edi
            //   52                   | push                edx
            //   66898d1ce7ffff       | mov                 word ptr [ebp - 0x18e4], cx
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc

        $sequence_8 = { e8???????? 83c410 83f8ff 74ca 8bc8 2bce 81f980000000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   83f8ff               | cmp                 eax, -1
            //   74ca                 | je                  0xffffffcc
            //   8bc8                 | mov                 ecx, eax
            //   2bce                 | sub                 ecx, esi
            //   81f980000000         | cmp                 ecx, 0x80

        $sequence_9 = { 50 6800000080 ffd3 85c0 7414 }
            // n = 5, score = 100
            //   50                   | push                eax
            //   6800000080           | push                0x80000000
            //   ffd3                 | call                ebx
            //   85c0                 | test                eax, eax
            //   7414                 | je                  0x16

    condition:
        7 of them and filesize < 250880
}