rule win_ariabody_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.ariabody."
        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.ariabody"
        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 = { 8a01 84c0 7406 3ac3 7402 32c3 }
            // n = 6, score = 300
            //   8a01                 | mov                 al, byte ptr [ecx]
            //   84c0                 | test                al, al
            //   7406                 | je                  8
            //   3ac3                 | cmp                 al, bl
            //   7402                 | je                  4
            //   32c3                 | xor                 al, bl

        $sequence_1 = { 8901 33c0 40 5b 5e 5f }
            // n = 6, score = 300
            //   8901                 | mov                 dword ptr [ecx], eax
            //   33c0                 | xor                 eax, eax
            //   40                   | inc                 eax
            //   5b                   | pop                 ebx
            //   5e                   | pop                 esi
            //   5f                   | pop                 edi

        $sequence_2 = { 8bf8 893e eb13 8b16 }
            // n = 4, score = 300
            //   8bf8                 | mov                 edi, eax
            //   893e                 | mov                 dword ptr [esi], edi
            //   eb13                 | jmp                 0x15
            //   8b16                 | mov                 edx, dword ptr [esi]

        $sequence_3 = { 83ec50 53 57 8bd9 e8???????? 8bf8 893b }
            // n = 7, score = 300
            //   83ec50               | sub                 esp, 0x50
            //   53                   | push                ebx
            //   57                   | push                edi
            //   8bd9                 | mov                 ebx, ecx
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax
            //   893b                 | mov                 dword ptr [ebx], edi

        $sequence_4 = { 8bcf 0fb6c0 50 ff75fc e8???????? }
            // n = 5, score = 300
            //   8bcf                 | mov                 ecx, edi
            //   0fb6c0               | movzx               eax, al
            //   50                   | push                eax
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   e8????????           |                     

        $sequence_5 = { eb13 8b16 8bcf e8???????? }
            // n = 4, score = 300
            //   eb13                 | jmp                 0x15
            //   8b16                 | mov                 edx, dword ptr [esi]
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     

        $sequence_6 = { 8bf2 56 8d55fc 03f9 e8???????? 59 }
            // n = 6, score = 300
            //   8bf2                 | mov                 esi, edx
            //   56                   | push                esi
            //   8d55fc               | lea                 edx, [ebp - 4]
            //   03f9                 | add                 edi, ecx
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_7 = { 03c7 50 ff5204 8b1e 8bd0 }
            // n = 5, score = 300
            //   03c7                 | add                 eax, edi
            //   50                   | push                eax
            //   ff5204               | call                dword ptr [edx + 4]
            //   8b1e                 | mov                 ebx, dword ptr [esi]
            //   8bd0                 | mov                 edx, eax

        $sequence_8 = { 4889ce 4d89c4 33d2 41b800010000 }
            // n = 4, score = 100
            //   4889ce               | inc                 ecx
            //   4d89c4               | call                dword ptr [edi + 0x10]
            //   33d2                 | dec                 ecx
            //   41b800010000         | mov                 ebp, eax

        $sequence_9 = { 8bd9 7418 488d0daf130100 e8???????? 85c0 7408 8bcb }
            // n = 7, score = 100
            //   8bd9                 | cmp                 edx, eax
            //   7418                 | ja                  0x520
            //   488d0daf130100       | dec                 esp
            //   e8????????           |                     
            //   85c0                 | lea                 edx, [0xffff8b1d]
            //   7408                 | mov                 ebx, ecx
            //   8bcb                 | je                  0x1a

        $sequence_10 = { 4889e0 4889f1 450fb64d00 4889f2 450fb66d01 }
            // n = 5, score = 100
            //   4889e0               | mov                 esp, eax
            //   4889f1               | xor                 edx, edx
            //   450fb64d00           | inc                 ecx
            //   4889f2               | mov                 eax, 0x100
            //   450fb66d01           | dec                 ecx

        $sequence_11 = { 41b800100000 41b904000000 41ff5710 4989c5 33c9 }
            // n = 5, score = 100
            //   41b800100000         | dec                 eax
            //   41b904000000         | lea                 ecx, [0x113af]
            //   41ff5710             | test                eax, eax
            //   4989c5               | je                  0x15
            //   33c9                 | mov                 ecx, ebx

        $sequence_12 = { 4889f9 488d141e 440f46c5 4533c9 }
            // n = 4, score = 100
            //   4889f9               | inc                 ecx
            //   488d141e             | mov                 eax, 0x1000
            //   440f46c5             | inc                 ecx
            //   4533c9               | mov                 ecx, 4

        $sequence_13 = { 4c8d35acd20000 49833cde00 7407 b801000000 eb5c b928000000 }
            // n = 6, score = 100
            //   4c8d35acd20000       | dec                 esp
            //   49833cde00           | lea                 esi, [0xd2ac]
            //   7407                 | dec                 ecx
            //   b801000000           | cmp                 dword ptr [esi + ebx*8], 0
            //   eb5c                 | je                  9
            //   b928000000           | mov                 eax, 1

        $sequence_14 = { 8bc3 483bd0 0f871a050000 4c8d151d8bffff }
            // n = 4, score = 100
            //   8bc3                 | jmp                 0x5e
            //   483bd0               | mov                 ecx, 0x28
            //   0f871a050000         | mov                 eax, ebx
            //   4c8d151d8bffff       | dec                 eax

        $sequence_15 = { 4c89e9 33d2 41b800800000 41ff5718 4c89e1 }
            // n = 5, score = 100
            //   4c89e9               | inc                 ebp
            //   33d2                 | xor                 ecx, ecx
            //   41b800800000         | dec                 eax
            //   41ff5718             | mov                 esi, ecx
            //   4c89e1               | dec                 ebp

    condition:
        7 of them and filesize < 253952
}