rule win_lowzero_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 2bca 49 83fb07 7507 0fb61f }
            // n = 5, score = 200
            //   2bca                 | sub                 ecx, edx
            //   49                   | dec                 ecx
            //   83fb07               | cmp                 ebx, 7
            //   7507                 | jne                 9
            //   0fb61f               | movzx               ebx, byte ptr [edi]

        $sequence_1 = { 56 8bd9 8955f4 33f6 895dfc }
            // n = 5, score = 200
            //   56                   | push                esi
            //   8bd9                 | mov                 ebx, ecx
            //   8955f4               | mov                 dword ptr [ebp - 0xc], edx
            //   33f6                 | xor                 esi, esi
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx

        $sequence_2 = { 49 83fb07 7507 0fb61f 83c307 47 }
            // n = 6, score = 200
            //   49                   | dec                 ecx
            //   83fb07               | cmp                 ebx, 7
            //   7507                 | jne                 9
            //   0fb61f               | movzx               ebx, byte ptr [edi]
            //   83c307               | add                 ebx, 7
            //   47                   | inc                 edi

        $sequence_3 = { 46 41 8a01 8806 46 41 }
            // n = 6, score = 200
            //   46                   | inc                 esi
            //   41                   | inc                 ecx
            //   8a01                 | mov                 al, byte ptr [ecx]
            //   8806                 | mov                 byte ptr [esi], al
            //   46                   | inc                 esi
            //   41                   | inc                 ecx

        $sequence_4 = { 8d0417 8945fc 8d9b00000000 0fb617 47 83fa20 0f83e2000000 }
            // n = 7, score = 200
            //   8d0417               | lea                 eax, [edi + edx]
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8d9b00000000         | lea                 ebx, [ebx]
            //   0fb617               | movzx               edx, byte ptr [edi]
            //   47                   | inc                 edi
            //   83fa20               | cmp                 edx, 0x20
            //   0f83e2000000         | jae                 0xe8

        $sequence_5 = { 7507 0fb61f 83c307 47 0fb607 47 2bc8 }
            // n = 7, score = 200
            //   7507                 | jne                 9
            //   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_6 = { e8???????? 83c40c 03f3 eb0b 2bce 8a0431 }
            // n = 6, score = 200
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   03f3                 | add                 esi, ebx
            //   eb0b                 | jmp                 0xd
            //   2bce                 | sub                 ecx, esi
            //   8a0431               | mov                 al, byte ptr [ecx + esi]

        $sequence_7 = { 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_8 = { 5d c3 8b4b3c 894df8 8d81f8000000 3bd0 }
            // n = 6, score = 200
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8b4b3c               | mov                 ecx, dword ptr [ebx + 0x3c]
            //   894df8               | mov                 dword ptr [ebp - 8], ecx
            //   8d81f8000000         | lea                 eax, [ecx + 0xf8]
            //   3bd0                 | cmp                 edx, eax

        $sequence_9 = { 83fb07 7507 0fb61f 83c307 47 0fb607 47 }
            // n = 7, score = 200
            //   83fb07               | cmp                 ebx, 7
            //   7507                 | jne                 9
            //   0fb61f               | movzx               ebx, byte ptr [edi]
            //   83c307               | add                 ebx, 7
            //   47                   | inc                 edi
            //   0fb607               | movzx               eax, byte ptr [edi]
            //   47                   | inc                 edi

    condition:
        7 of them and filesize < 433152
}