rule win_hacksfase_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.hacksfase."
        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.hacksfase"
        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 = { 81ec1c080000 53 55 56 57 6a1c 32db }
            // n = 7, score = 100
            //   81ec1c080000         | sub                 esp, 0x81c
            //   53                   | push                ebx
            //   55                   | push                ebp
            //   56                   | push                esi
            //   57                   | push                edi
            //   6a1c                 | push                0x1c
            //   32db                 | xor                 bl, bl

        $sequence_1 = { 8b4624 897804 385c2410 5f 7540 ff7618 e8???????? }
            // n = 7, score = 100
            //   8b4624               | mov                 eax, dword ptr [esi + 0x24]
            //   897804               | mov                 dword ptr [eax + 4], edi
            //   385c2410             | cmp                 byte ptr [esp + 0x10], bl
            //   5f                   | pop                 edi
            //   7540                 | jne                 0x42
            //   ff7618               | push                dword ptr [esi + 0x18]
            //   e8????????           |                     

        $sequence_2 = { 837804ff 7409 6a01 8bce e8???????? 834dfcff 8d4db4 }
            // n = 7, score = 100
            //   837804ff             | cmp                 dword ptr [eax + 4], -1
            //   7409                 | je                  0xb
            //   6a01                 | push                1
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   834dfcff             | or                  dword ptr [ebp - 4], 0xffffffff
            //   8d4db4               | lea                 ecx, [ebp - 0x4c]

        $sequence_3 = { ff742420 57 ff16 83c418 5f 5e }
            // n = 6, score = 100
            //   ff742420             | push                dword ptr [esp + 0x20]
            //   57                   | push                edi
            //   ff16                 | call                dword ptr [esi]
            //   83c418               | add                 esp, 0x18
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_4 = { 33c0 8945e4 8d45e4 68???????? 50 }
            // n = 5, score = 100
            //   33c0                 | xor                 eax, eax
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax
            //   8d45e4               | lea                 eax, [ebp - 0x1c]
            //   68????????           |                     
            //   50                   | push                eax

        $sequence_5 = { 8d442450 8d4c240c 50 51 56 56 }
            // n = 6, score = 100
            //   8d442450             | lea                 eax, [esp + 0x50]
            //   8d4c240c             | lea                 ecx, [esp + 0xc]
            //   50                   | push                eax
            //   51                   | push                ecx
            //   56                   | push                esi
            //   56                   | push                esi

        $sequence_6 = { 8d4c2428 899c24c4220000 894c2410 8d4c2428 ff15???????? 8d4c2474 }
            // n = 6, score = 100
            //   8d4c2428             | lea                 ecx, [esp + 0x28]
            //   899c24c4220000       | mov                 dword ptr [esp + 0x22c4], ebx
            //   894c2410             | mov                 dword ptr [esp + 0x10], ecx
            //   8d4c2428             | lea                 ecx, [esp + 0x28]
            //   ff15????????         |                     
            //   8d4c2474             | lea                 ecx, [esp + 0x74]

        $sequence_7 = { ff15???????? 8945c4 395de0 742e b804010000 8945c8 }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   8945c4               | mov                 dword ptr [ebp - 0x3c], eax
            //   395de0               | cmp                 dword ptr [ebp - 0x20], ebx
            //   742e                 | je                  0x30
            //   b804010000           | mov                 eax, 0x104
            //   8945c8               | mov                 dword ptr [ebp - 0x38], eax

        $sequence_8 = { 68???????? ff15???????? 83c408 85c0 7422 6a01 50 }
            // n = 7, score = 100
            //   68????????           |                     
            //   ff15????????         |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   7422                 | je                  0x24
            //   6a01                 | push                1
            //   50                   | push                eax

        $sequence_9 = { f3a4 8b0d???????? 51 ff15???????? 5f }
            // n = 5, score = 100
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   8b0d????????         |                     
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   5f                   | pop                 edi

    condition:
        7 of them and filesize < 106496
}