rule win_arcane_stealer_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.arcane_stealer."
        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.arcane_stealer"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 44894c2474 e8???????? ba07010000 488dbc2400100000 4889f9 4c8d05f9b50000 48895c2458 }
            // n = 7, score = 100
            //   44894c2474           | imul                eax, esi
            //   e8????????           |                     
            //   ba07010000           | dec                 ebp
            //   488dbc2400100000     | mov                 edx, esi
            //   4889f9               | dec                 esp
            //   4c8d05f9b50000       | imul                edx, ebp
            //   48895c2458           | dec                 eax

        $sequence_1 = { 415e 415f c3 4c8b4c2468 0f57c0 0f11442428 4c89642420 }
            // n = 7, score = 100
            //   415e                 | dec                 eax
            //   415f                 | mov                 ecx, ebx
            //   c3                   | dec                 esp
            //   4c8b4c2468           | lea                 eax, [0xaf64]
            //   0f57c0               | dec                 esp
            //   0f11442428           | mov                 ecx, dword ptr [esp + 0x48]
            //   4c89642420           | dec                 esp

        $sequence_2 = { 4989c7 4801c0 4939ef 72f5 4c89f1 4c89fa }
            // n = 6, score = 100
            //   4989c7               | movaps              xmmword ptr [esp + 0x20], xmm0
            //   4801c0               | movaps              xmmword ptr [esp + 0x80], xmm0
            //   4939ef               | movaps              xmmword ptr [esp + 0x70], xmm0
            //   72f5                 | movaps              xmmword ptr [esp + 0x60], xmm0
            //   4c89f1               | movaps              xmmword ptr [esp + 0x50], xmm0
            //   4c89fa               | movaps              xmmword ptr [esp + 0x40], xmm0

        $sequence_3 = { ba20000000 4889f1 e8???????? eb07 488d35bae30000 4889f1 ff15???????? }
            // n = 7, score = 100
            //   ba20000000           | inc                 ecx
            //   4889f1               | mov                 eax, 3
            //   e8????????           |                     
            //   eb07                 | dec                 ebp
            //   488d35bae30000       | mov                 ecx, esp
            //   4889f1               | inc                 ecx
            //   ff15????????         |                     

        $sequence_4 = { 41b840040000 4889d9 31d2 e8???????? 4889f9 31d2 4531c0 }
            // n = 7, score = 100
            //   41b840040000         | mov                 dword ptr [esp + 0x48], edi
            //   4889d9               | dec                 eax
            //   31d2                 | lea                 eax, [edi + 0x10]
            //   e8????????           |                     
            //   4889f9               | dec                 eax
            //   31d2                 | mov                 dword ptr [esp + 0x50], eax
            //   4531c0               | dec                 eax

        $sequence_5 = { 488b4c2448 31d2 ff15???????? 488d4c2450 e8???????? 488d4c2430 e8???????? }
            // n = 7, score = 100
            //   488b4c2448           | mov                 ecx, 0x80000001
            //   31d2                 | push                edi
            //   ff15????????         |                     
            //   488d4c2450           | dec                 eax
            //   e8????????           |                     
            //   488d4c2430           | sub                 esp, 0x238
            //   e8????????           |                     

        $sequence_6 = { 89542430 89442428 894c2420 ba40000000 488d8c24b0030000 4c8d0549f80000 e8???????? }
            // n = 7, score = 100
            //   89542430             | inc                 esi
            //   89442428             | dec                 eax
            //   894c2420             | cmp                 esi, 4
            //   ba40000000           | jne                 0x1803
            //   488d8c24b0030000     | xor                 esi, esi
            //   4c8d0549f80000       | nop                 word ptr [eax + eax]
            //   e8????????           |                     

        $sequence_7 = { 74ed 4c89f1 e8???????? 4989c7 4889d9 4c89f2 4989c0 }
            // n = 7, score = 100
            //   74ed                 | mov                 ecx, 0xfde9
            //   4c89f1               | xor                 edx, edx
            //   e8????????           |                     
            //   4989c7               | inc                 ecx
            //   4889d9               | mov                 ecx, 0xffffffff
            //   4c89f2               | xorps               xmm0, xmm0
            //   4989c0               | movups              xmmword ptr [esp + 0x30], xmm0

        $sequence_8 = { 7420 4a8b8c3430010000 4885c9 74ea e8???????? }
            // n = 5, score = 100
            //   7420                 | mov                 ecx, edi
            //   4a8b8c3430010000     | dec                 eax
            //   4885c9               | mov                 ecx, ebx
            //   74ea                 | dec                 ebp
            //   e8????????           |                     

        $sequence_9 = { 85c0 7442 488b8424a0000000 448b4808 8b400c 410fb7c9 }
            // n = 6, score = 100
            //   85c0                 | dec                 eax
            //   7442                 | mov                 esi, edx
            //   488b8424a0000000     | dec                 eax
            //   448b4808             | mov                 edi, ecx
            //   8b400c               | dec                 eax
            //   410fb7c9             | test                eax, eax

    condition:
        7 of them and filesize < 346112
}