rule win_polpo_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "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 = { 8d85dcfbffff 50 e8???????? 8bf8 83c410 83ffff 0f845e020000 }
            // n = 7, score = 100
            //   8d85dcfbffff         | lea                 eax, [ebp - 0x424]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax
            //   83c410               | add                 esp, 0x10
            //   83ffff               | cmp                 edi, -1
            //   0f845e020000         | je                  0x264

        $sequence_1 = { e8???????? 83c404 8906 8b55bc 895604 8d45c4 8d4801 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8906                 | mov                 dword ptr [esi], eax
            //   8b55bc               | mov                 edx, dword ptr [ebp - 0x44]
            //   895604               | mov                 dword ptr [esi + 4], edx
            //   8d45c4               | lea                 eax, [ebp - 0x3c]
            //   8d4801               | lea                 ecx, [eax + 1]

        $sequence_2 = { 68???????? 51 c785f8faffff00000000 e8???????? 8bf0 83c410 83feff }
            // n = 7, score = 100
            //   68????????           |                     
            //   51                   | push                ecx
            //   c785f8faffff00000000     | mov    dword ptr [ebp - 0x508], 0
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   83c410               | add                 esp, 0x10
            //   83feff               | cmp                 esi, -1

        $sequence_3 = { ff15???????? 6880010000 6a00 ff15???????? 50 ff15???????? 6a00 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   6880010000           | push                0x180
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   6a00                 | push                0

        $sequence_4 = { 8bf8 83c410 83ffff 0f845e020000 6800040000 8d8ddcfbffff 6a00 }
            // n = 7, score = 100
            //   8bf8                 | mov                 edi, eax
            //   83c410               | add                 esp, 0x10
            //   83ffff               | cmp                 edi, -1
            //   0f845e020000         | je                  0x264
            //   6800040000           | push                0x400
            //   8d8ddcfbffff         | lea                 ecx, [ebp - 0x424]
            //   6a00                 | push                0

        $sequence_5 = { 89b500faffff 6689850cfaffff e8???????? 6808020000 8d95f4fdffff 6a00 52 }
            // n = 7, score = 100
            //   89b500faffff         | mov                 dword ptr [ebp - 0x600], esi
            //   6689850cfaffff       | mov                 word ptr [ebp - 0x5f4], ax
            //   e8????????           |                     
            //   6808020000           | push                0x208
            //   8d95f4fdffff         | lea                 edx, [ebp - 0x20c]
            //   6a00                 | push                0
            //   52                   | push                edx

        $sequence_6 = { c645fc01 e8???????? 83c404 8d8d4cfdffff 899d48fdffff }
            // n = 5, score = 100
            //   c645fc01             | mov                 byte ptr [ebp - 4], 1
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8d8d4cfdffff         | lea                 ecx, [ebp - 0x2b4]
            //   899d48fdffff         | mov                 dword ptr [ebp - 0x2b8], ebx

        $sequence_7 = { 8945fc 56 57 6a00 6a00 6a04 }
            // n = 6, score = 100
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   56                   | push                esi
            //   57                   | push                edi
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a04                 | push                4

        $sequence_8 = { 668985d4fdffff e8???????? 8b16 83c40c 83c604 56 8d85d4fdffff }
            // n = 7, score = 100
            //   668985d4fdffff       | mov                 word ptr [ebp - 0x22c], ax
            //   e8????????           |                     
            //   8b16                 | mov                 edx, dword ptr [esi]
            //   83c40c               | add                 esp, 0xc
            //   83c604               | add                 esi, 4
            //   56                   | push                esi
            //   8d85d4fdffff         | lea                 eax, [ebp - 0x22c]

        $sequence_9 = { ff15???????? 6a00 6800040000 8d8ddcfbffff 68???????? 51 }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   6a00                 | push                0
            //   6800040000           | push                0x400
            //   8d8ddcfbffff         | lea                 ecx, [ebp - 0x424]
            //   68????????           |                     
            //   51                   | push                ecx

    condition:
        7 of them and filesize < 250880
}