rule win_lowzero_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.lowzero."
        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.lowzero"
        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 = { 0fb77b06 85ff 7420 8d4b24 03c8 8b5104 }
            // n = 6, score = 200
            //   0fb77b06             | movzx               edi, word ptr [ebx + 6]
            //   85ff                 | test                edi, edi
            //   7420                 | je                  0x22
            //   8d4b24               | lea                 ecx, [ebx + 0x24]
            //   03c8                 | add                 ecx, eax
            //   8b5104               | mov                 edx, dword ptr [ecx + 4]

        $sequence_1 = { 8d81f8000000 3bd0 72e0 03d9 }
            // n = 4, score = 200
            //   8d81f8000000         | lea                 eax, [ecx + 0xf8]
            //   3bd0                 | cmp                 edx, eax
            //   72e0                 | jb                  0xffffffe2
            //   03d9                 | add                 ebx, ecx

        $sequence_2 = { 57 8b423c 8b55f4 03c6 }
            // n = 4, score = 200
            //   57                   | push                edi
            //   8b423c               | mov                 eax, dword ptr [edx + 0x3c]
            //   8b55f4               | mov                 edx, dword ptr [ebp - 0xc]
            //   03c6                 | add                 eax, esi

        $sequence_3 = { 5d c3 0fb74314 57 0fb77b06 }
            // n = 5, score = 200
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   0fb74314             | movzx               eax, word ptr [ebx + 0x14]
            //   57                   | push                edi
            //   0fb77b06             | movzx               edi, word ptr [ebx + 6]

        $sequence_4 = { 47 2bc8 8d4602 03c3 3b450c }
            // n = 5, score = 200
            //   47                   | inc                 edi
            //   2bc8                 | sub                 ecx, eax
            //   8d4602               | lea                 eax, [esi + 2]
            //   03c3                 | add                 eax, ebx
            //   3b450c               | cmp                 eax, dword ptr [ebp + 0xc]

        $sequence_5 = { c7473400000000 8b45d4 89473c 8b441154 }
            // n = 4, score = 200
            //   c7473400000000       | mov                 dword ptr [edi + 0x34], 0
            //   8b45d4               | mov                 eax, dword ptr [ebp - 0x2c]
            //   89473c               | mov                 dword ptr [edi + 0x3c], eax
            //   8b441154             | mov                 eax, dword ptr [ecx + edx + 0x54]

        $sequence_6 = { c3 e8???????? 5f 5e 5b c70016000000 33c0 }
            // n = 7, score = 200
            //   c3                   | ret                 
            //   e8????????           |                     
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   c70016000000         | mov                 dword ptr [eax], 0x16
            //   33c0                 | xor                 eax, eax

        $sequence_7 = { ff740854 51 56 e8???????? 8b55fc }
            // n = 5, score = 200
            //   ff740854             | push                dword ptr [eax + ecx + 0x54]
            //   51                   | push                ecx
            //   56                   | push                esi
            //   e8????????           |                     
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]

        $sequence_8 = { 0fb61f 83c307 47 0fb607 47 2bc8 }
            // n = 6, score = 200
            //   0fb61f               | movzx               ebx, byte ptr [edi]
            //   83c307               | add                 ebx, 7
            //   47                   | inc                 edi
            //   0fb607               | movzx               eax, byte ptr [edi]
            //   47                   | inc                 edi
            //   2bc8                 | sub                 ecx, eax

        $sequence_9 = { 8b45f8 ff740854 51 56 e8???????? }
            // n = 5, score = 200
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   ff740854             | push                dword ptr [eax + ecx + 0x54]
            //   51                   | push                ecx
            //   56                   | push                esi
            //   e8????????           |                     

    condition:
        7 of them and filesize < 433152
}