rule win_sykipot_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 8b94242c060000 56 8d842498000000 57 50 8b84243c060000 }
            // n = 6, score = 200
            //   8b94242c060000       | mov                 edx, dword ptr [esp + 0x62c]
            //   56                   | push                esi
            //   8d842498000000       | lea                 eax, [esp + 0x98]
            //   57                   | push                edi
            //   50                   | push                eax
            //   8b84243c060000       | mov                 eax, dword ptr [esp + 0x63c]

        $sequence_1 = { 8d442410 83e103 f3a4 5f 5e 5b }
            // n = 6, score = 200
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   83e103               | and                 ecx, 3
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

        $sequence_2 = { 5f 5e 5d b80b000000 5b 81c45c180000 }
            // n = 6, score = 200
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   b80b000000           | mov                 eax, 0xb
            //   5b                   | pop                 ebx
            //   81c45c180000         | add                 esp, 0x185c

        $sequence_3 = { 8911 8b94244c060000 894104 895108 8bcd e8???????? 8b942440060000 }
            // n = 7, score = 200
            //   8911                 | mov                 dword ptr [ecx], edx
            //   8b94244c060000       | mov                 edx, dword ptr [esp + 0x64c]
            //   894104               | mov                 dword ptr [ecx + 4], eax
            //   895108               | mov                 dword ptr [ecx + 8], edx
            //   8bcd                 | mov                 ecx, ebp
            //   e8????????           |                     
            //   8b942440060000       | mov                 edx, dword ptr [esp + 0x640]

        $sequence_4 = { eb58 397c241c 7518 a1???????? 8bd0 c1e20a 81c2???????? }
            // n = 7, score = 200
            //   eb58                 | jmp                 0x5a
            //   397c241c             | cmp                 dword ptr [esp + 0x1c], edi
            //   7518                 | jne                 0x1a
            //   a1????????           |                     
            //   8bd0                 | mov                 edx, eax
            //   c1e20a               | shl                 edx, 0xa
            //   81c2????????         |                     

        $sequence_5 = { 8944240c a0???????? 894c2410 88442418 }
            // n = 4, score = 200
            //   8944240c             | mov                 dword ptr [esp + 0xc], eax
            //   a0????????           |                     
            //   894c2410             | mov                 dword ptr [esp + 0x10], ecx
            //   88442418             | mov                 byte ptr [esp + 0x18], al

        $sequence_6 = { 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_7 = { 8d84248c000000 f3a4 8d8c2490010000 50 51 }
            // n = 5, score = 200
            //   8d84248c000000       | lea                 eax, [esp + 0x8c]
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   8d8c2490010000       | lea                 ecx, [esp + 0x190]
            //   50                   | push                eax
            //   51                   | push                ecx

        $sequence_8 = { c744241000000000 85c0 0f8e77010000 8b2d???????? 8b1d???????? be???????? }
            // n = 6, score = 200
            //   c744241000000000     | mov                 dword ptr [esp + 0x10], 0
            //   85c0                 | test                eax, eax
            //   0f8e77010000         | jle                 0x17d
            //   8b2d????????         |                     
            //   8b1d????????         |                     
            //   be????????           |                     

        $sequence_9 = { 83e103 8844243c f3a4 b907000000 33c0 8d7c243d }
            // n = 6, score = 200
            //   83e103               | and                 ecx, 3
            //   8844243c             | mov                 byte ptr [esp + 0x3c], al
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   b907000000           | mov                 ecx, 7
            //   33c0                 | xor                 eax, eax
            //   8d7c243d             | lea                 edi, [esp + 0x3d]

    condition:
        7 of them and filesize < 286720
}