rule win_sykipot_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.sykipot."
        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.sykipot"
        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 = { b900100000 bf???????? f3ab b900100000 bf???????? f3ab b941000000 }
            // n = 7, score = 200
            //   b900100000           | mov                 ecx, 0x1000
            //   bf????????           |                     
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   b900100000           | mov                 ecx, 0x1000
            //   bf????????           |                     
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   b941000000           | mov                 ecx, 0x41

        $sequence_1 = { 6a01 51 ff15???????? 8be8 be00010000 896c2410 }
            // n = 6, score = 200
            //   6a01                 | push                1
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   8be8                 | mov                 ebp, eax
            //   be00010000           | mov                 esi, 0x100
            //   896c2410             | mov                 dword ptr [esp + 0x10], ebp

        $sequence_2 = { 8db4249c000000 83c044 81fb???????? 89442410 f3a5 7c8a 5f }
            // n = 7, score = 200
            //   8db4249c000000       | lea                 esi, [esp + 0x9c]
            //   83c044               | add                 eax, 0x44
            //   81fb????????         |                     
            //   89442410             | mov                 dword ptr [esp + 0x10], eax
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   7c8a                 | jl                  0xffffff8c
            //   5f                   | pop                 edi

        $sequence_3 = { ffd3 83c408 a3???????? 85c0 7423 8d942490020000 52 }
            // n = 7, score = 200
            //   ffd3                 | call                ebx
            //   83c408               | add                 esp, 8
            //   a3????????           |                     
            //   85c0                 | test                eax, eax
            //   7423                 | je                  0x25
            //   8d942490020000       | lea                 edx, [esp + 0x290]
            //   52                   | push                edx

        $sequence_4 = { be00010000 896c2410 ebca 8d8c2468010000 8d942468050000 894c2430 }
            // n = 6, score = 200
            //   be00010000           | mov                 esi, 0x100
            //   896c2410             | mov                 dword ptr [esp + 0x10], ebp
            //   ebca                 | jmp                 0xffffffcc
            //   8d8c2468010000       | lea                 ecx, [esp + 0x168]
            //   8d942468050000       | lea                 edx, [esp + 0x568]
            //   894c2430             | mov                 dword ptr [esp + 0x30], ecx

        $sequence_5 = { 8bc8 33c0 83e103 f3a4 8dbc246c030000 83c9ff }
            // n = 6, score = 200
            //   8bc8                 | mov                 ecx, eax
            //   33c0                 | xor                 eax, eax
            //   83e103               | and                 ecx, 3
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   8dbc246c030000       | lea                 edi, [esp + 0x36c]
            //   83c9ff               | or                  ecx, 0xffffffff

        $sequence_6 = { 7433 8d442400 83e802 803c085c }
            // n = 4, score = 200
            //   7433                 | je                  0x35
            //   8d442400             | lea                 eax, [esp]
            //   83e802               | sub                 eax, 2
            //   803c085c             | cmp                 byte ptr [eax + ecx], 0x5c

        $sequence_7 = { 6a28 ff15???????? 50 ff15???????? 85c0 752f }
            // n = 6, score = 200
            //   6a28                 | push                0x28
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   752f                 | jne                 0x31

        $sequence_8 = { 740d 8b442424 6aff 50 ff15???????? 8b442410 8b0d???????? }
            // n = 7, score = 200
            //   740d                 | je                  0xf
            //   8b442424             | mov                 eax, dword ptr [esp + 0x24]
            //   6aff                 | push                -1
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b442410             | mov                 eax, dword ptr [esp + 0x10]
            //   8b0d????????         |                     

        $sequence_9 = { ff15???????? 89442410 8bf8 85ff 0f846b020000 8b942420020000 6a00 }
            // n = 7, score = 200
            //   ff15????????         |                     
            //   89442410             | mov                 dword ptr [esp + 0x10], eax
            //   8bf8                 | mov                 edi, eax
            //   85ff                 | test                edi, edi
            //   0f846b020000         | je                  0x271
            //   8b942420020000       | mov                 edx, dword ptr [esp + 0x220]
            //   6a00                 | push                0

    condition:
        7 of them and filesize < 286720
}