rule win_danderspritz_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.danderspritz."
        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.danderspritz"
        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 = { 3939 740f ffc0 4883c158 3dff000000 736c }
            // n = 6, score = 100
            //   3939                 | nop                 
            //   740f                 | dec                 eax
            //   ffc0                 | mov                 eax, 0x10410411
            //   4883c158             | add                 al, 0x41
            //   3dff000000           | adc                 byte ptr [eax + ecx*2], al
            //   736c                 | mul                 ecx

        $sequence_1 = { 0f84b7000000 4c8b4008 498bd0 4d3bc6 742c 493bf6 7527 }
            // n = 7, score = 100
            //   0f84b7000000         | lea                 ecx, [0x413c4]
            //   4c8b4008             | dec                 eax
            //   498bd0               | add                 edi, 0x10
            //   4d3bc6               | cmp                 esi, 0xf
            //   742c                 | jbe                 0xbcf
            //   493bf6               | jmp                 0xc20
            //   7527                 | mov                 eax, 1

        $sequence_2 = { 3bc5 0f8547020000 8b542448 0fb74c2434 e8???????? 8bf8 e9???????? }
            // n = 7, score = 100
            //   3bc5                 | dec                 eax
            //   0f8547020000         | lea                 ecx, [eax + 0x28]
            //   8b542448             | dec                 eax
            //   0fb74c2434           | mov                 ecx, edi
            //   e8????????           |                     
            //   8bf8                 | dec                 eax
            //   e9????????           |                     

        $sequence_3 = { 89442420 e8???????? 488d4c2438 4533e4 4c89642438 c744243004000000 }
            // n = 6, score = 100
            //   89442420             | dec                 eax
            //   e8????????           |                     
            //   488d4c2438           | cmovb               esi, ecx
            //   4533e4               | dec                 eax
            //   4c89642438           | mov                 edx, dword ptr [edx + 8]
            //   c744243004000000     | dec                 ecx

        $sequence_4 = { 410fb60409 894328 3bfa 7224 85d2 7507 c74328ffffffff }
            // n = 7, score = 100
            //   410fb60409           | sub                 esp, 0xb0
            //   894328               | dec                 eax
            //   3bfa                 | mov                 dword ptr [esp + 0x40], 0xfffffffe
            //   7224                 | dec                 eax
            //   85d2                 | mov                 dword ptr [eax + 0x18], ebx
            //   7507                 | dec                 eax
            //   c74328ffffffff       | mov                 ebx, ecx

        $sequence_5 = { 83611800 488d4c2450 e8???????? 488bf8 4885c0 747f 488b742450 }
            // n = 7, score = 100
            //   83611800             | mov                 dword ptr [esp + 0x1f8], esp
            //   488d4c2450           | mov                 ecx, dword ptr [esp + 0xa8]
            //   e8????????           |                     
            //   488bf8               | mov                 dword ptr [esp + 0x60], ecx
            //   4885c0               | mov                 dword ptr [esp + 0x58], eax
            //   747f                 | dec                 eax
            //   488b742450           | mov                 eax, dword ptr [esp + 0xc8]

        $sequence_6 = { 4881c120010000 e8???????? 488bcb e8???????? 85c0 7512 8bbb34010000 }
            // n = 7, score = 100
            //   4881c120010000       | jmp                 0x5b0
            //   e8????????           |                     
            //   488bcb               | dec                 eax
            //   e8????????           |                     
            //   85c0                 | mov                 dword ptr [eax], ebp
            //   7512                 | dec                 eax
            //   8bbb34010000         | mov                 ecx, ebx

        $sequence_7 = { 4883ec20 803d????????01 7545 eb13 488b18 488bd0 e8???????? }
            // n = 7, score = 100
            //   4883ec20             | call                dword ptr [eax + 0x70]
            //   803d????????01       |                     
            //   7545                 | dec                 eax
            //   eb13                 | lea                 ecx, [esp + 0x28]
            //   488b18               | dec                 eax
            //   488bd0               | mov                 edx, ebp
            //   e8????????           |                     

        $sequence_8 = { 57 4883ec20 8bf9 488d0d69ce0200 33db e8???????? 488b0d???????? }
            // n = 7, score = 100
            //   57                   | dec                 eax
            //   4883ec20             | mov                 ebx, dword ptr [esp + 0x48]
            //   8bf9                 | jne                 0x1c7d
            //   488d0d69ce0200       | inc                 eax
            //   33db                 | movzx               eax, dh
            //   e8????????           |                     
            //   488b0d????????       |                     

        $sequence_9 = { 898ba8000000 eb0a 488bcb e8???????? 8bc6 488b5c2440 488b6c2448 }
            // n = 7, score = 100
            //   898ba8000000         | lea                 esi, [eax + 1]
            //   eb0a                 | mov                 ecx, esi
            //   488bcb               | mov                 ecx, 0xfde9
            //   e8????????           |                     
            //   8bc6                 | test                eax, eax
            //   488b5c2440           | je                  0x12a0
            //   488b6c2448           | lea                 esi, [eax + eax + 2]

    condition:
        7 of them and filesize < 750592
}