rule win_xorist_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.xorist."
        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.xorist"
        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 = { eb03 8b7102 8d442418 3bf8 7507 8bc6 e9???????? }
            // n = 7, score = 100
            //   eb03                 | jmp                 5
            //   8b7102               | mov                 esi, dword ptr [ecx + 2]
            //   8d442418             | lea                 eax, [esp + 0x18]
            //   3bf8                 | cmp                 edi, eax
            //   7507                 | jne                 9
            //   8bc6                 | mov                 eax, esi
            //   e9????????           |                     

        $sequence_1 = { 8b442414 8bce 035318 2bc5 83c608 8911 }
            // n = 6, score = 100
            //   8b442414             | mov                 eax, dword ptr [esp + 0x14]
            //   8bce                 | mov                 ecx, esi
            //   035318               | add                 edx, dword ptr [ebx + 0x18]
            //   2bc5                 | sub                 eax, ebp
            //   83c608               | add                 esi, 8
            //   8911                 | mov                 dword ptr [ecx], edx

        $sequence_2 = { 6af5 ff15???????? 894304 56 57 bf00400000 8364241000 }
            // n = 7, score = 100
            //   6af5                 | push                -0xb
            //   ff15????????         |                     
            //   894304               | mov                 dword ptr [ebx + 4], eax
            //   56                   | push                esi
            //   57                   | push                edi
            //   bf00400000           | mov                 edi, 0x4000
            //   8364241000           | and                 dword ptr [esp + 0x10], 0

        $sequence_3 = { 884500 83ff01 0f8657fdffff 8a4301 884501 83ff02 0f8648fdffff }
            // n = 7, score = 100
            //   884500               | mov                 byte ptr [ebp], al
            //   83ff01               | cmp                 edi, 1
            //   0f8657fdffff         | jbe                 0xfffffd5d
            //   8a4301               | mov                 al, byte ptr [ebx + 1]
            //   884501               | mov                 byte ptr [ebp + 1], al
            //   83ff02               | cmp                 edi, 2
            //   0f8648fdffff         | jbe                 0xfffffd4e

        $sequence_4 = { 8a80a0404400 88442445 8bc6 c1e810 0fb6c0 }
            // n = 5, score = 100
            //   8a80a0404400         | mov                 al, byte ptr [eax + 0x4440a0]
            //   88442445             | mov                 byte ptr [esp + 0x45], al
            //   8bc6                 | mov                 eax, esi
            //   c1e810               | shr                 eax, 0x10
            //   0fb6c0               | movzx               eax, al

        $sequence_5 = { 7505 84c0 7501 47 33db 83c602 66395efe }
            // n = 7, score = 100
            //   7505                 | jne                 7
            //   84c0                 | test                al, al
            //   7501                 | jne                 3
            //   47                   | inc                 edi
            //   33db                 | xor                 ebx, ebx
            //   83c602               | add                 esi, 2
            //   66395efe             | cmp                 word ptr [esi - 2], bx

        $sequence_6 = { ffd6 8b471c 8d4df8 51 68???????? 50 8b30 }
            // n = 7, score = 100
            //   ffd6                 | call                esi
            //   8b471c               | mov                 eax, dword ptr [edi + 0x1c]
            //   8d4df8               | lea                 ecx, [ebp - 8]
            //   51                   | push                ecx
            //   68????????           |                     
            //   50                   | push                eax
            //   8b30                 | mov                 esi, dword ptr [eax]

        $sequence_7 = { 8d4d30 8bf0 e8???????? 8bc8 0bca 0f842a060000 }
            // n = 6, score = 100
            //   8d4d30               | lea                 ecx, [ebp + 0x30]
            //   8bf0                 | mov                 esi, eax
            //   e8????????           |                     
            //   8bc8                 | mov                 ecx, eax
            //   0bca                 | or                  ecx, edx
            //   0f842a060000         | je                  0x630

        $sequence_8 = { 8b44241c 83c40c 50 e8???????? 55 894760 e8???????? }
            // n = 7, score = 100
            //   8b44241c             | mov                 eax, dword ptr [esp + 0x1c]
            //   83c40c               | add                 esp, 0xc
            //   50                   | push                eax
            //   e8????????           |                     
            //   55                   | push                ebp
            //   894760               | mov                 dword ptr [edi + 0x60], eax
            //   e8????????           |                     

        $sequence_9 = { 894130 834948ff c20800 8b442404 894114 8b442408 c6410c01 }
            // n = 7, score = 100
            //   894130               | mov                 dword ptr [ecx + 0x30], eax
            //   834948ff             | or                  dword ptr [ecx + 0x48], 0xffffffff
            //   c20800               | ret                 8
            //   8b442404             | mov                 eax, dword ptr [esp + 4]
            //   894114               | mov                 dword ptr [ecx + 0x14], eax
            //   8b442408             | mov                 eax, dword ptr [esp + 8]
            //   c6410c01             | mov                 byte ptr [ecx + 0xc], 1

    condition:
        7 of them and filesize < 1402880
}