rule win_spica_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.spica."
        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.spica"
        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 = { ff15???????? 8065a5fb 488bdf 897d98 48895d90 897da0 807e1100 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   8065a5fb             | mov                 eax, edi
            //   488bdf               | dec                 eax
            //   897d98               | mov                 eax, esi
            //   48895d90             | dec                 esp
            //   897da0               | mov                 edi, dword ptr [ebp + 0x780]
            //   807e1100             | dec                 eax

        $sequence_1 = { ff15???????? 488b8ea0000000 4885c9 7410 66443bbec0000000 7306 4883c170 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   488b8ea0000000       | xor                 edx, edx
            //   4885c9               | dec                 esp
            //   7410                 | mov                 eax, dword ptr [ebp + 0x260]
            //   66443bbec0000000     | dec                 eax
            //   7306                 | mov                 ecx, dword ptr [ebp + 0x168]
            //   4883c170             | dec                 eax

        $sequence_2 = { e8???????? eb75 b908000000 bac8020000 e8???????? eb64 c685170a000001 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   eb75                 | jmp                 0x27d
            //   b908000000           | test                al, al
            //   bac8020000           | jne                 0x1b1
            //   e8????????           |                     
            //   eb64                 | mov                 byte ptr [esi + 8], 1
            //   c685170a000001       | jmp                 0x1b1

        $sequence_3 = { ff15???????? 488b0e 4885c9 743b 488b4608 48894df8 488945e8 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   488b0e               | je                  0x16b
            //   4885c9               | dec                 eax
            //   743b                 | mov                 ebx, dword ptr [edi]
            //   488b4608             | dec                 eax
            //   48894df8             | mov                 ecx, dword ptr [ebx + 0x18]
            //   488945e8             | dec                 eax

        $sequence_4 = { ff15???????? 4885c0 0f84de060000 4889c1 488905???????? 41b80e000000 31d2 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   4885c0               | test                eax, eax
            //   0f84de060000         | je                  0x19ef
            //   4889c1               | dec                 eax
            //   488905????????       |                     
            //   41b80e000000         | mov                 ecx, eax
            //   31d2                 | mov                 edx, 8

        $sequence_5 = { f7d9 481bc0 4883c002 4889442440 4885db 0f8498020000 4889ac24a0000000 }
            // n = 7, score = 100
            //   f7d9                 | test                eax, eax
            //   481bc0               | test                dl, 1
            //   4883c002             | je                  0x68
            //   4889442440           | dec                 eax
            //   4885db               | mov                 ebp, esi
            //   0f8498020000         | jmp                 0x72
            //   4889ac24a0000000     | mov                 dl, 1

        $sequence_6 = { f6c101 7410 f390 f390 f390 f390 f390 }
            // n = 7, score = 100
            //   f6c101               | inc                 ecx
            //   7410                 | mov                 eax, 2
            //   f390                 | jmp                 0x3fe
            //   f390                 | test                byte ptr [eax + 0x34], 4
            //   f390                 | jne                 0x406
            //   f390                 | dec                 eax
            //   f390                 | mov                 ecx, dword ptr [eax + 0x20]

        $sequence_7 = { ff15???????? 488b83a0000000 4885c0 740e 663bbbc0000000 7305 488bf0 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   488b83a0000000       | dec                 ecx
            //   4885c0               | mov                 ecx, esp
            //   740e                 | dec                 eax
            //   663bbbc0000000       | mov                 ecx, dword ptr [esi + 0x18]
            //   7305                 | dec                 eax
            //   488bf0               | test                ecx, ecx

        $sequence_8 = { e8???????? eb0f 488d0549931300 c64201ff 48894210 4533c0 896c2420 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   eb0f                 | mov                 edi, esi
            //   488d0549931300       | movzx               eax, byte ptr [ebx + 0xa]
            //   c64201ff             | jmp                 0x5c
            //   48894210             | dec                 eax
            //   4533c0               | test                edx, edx
            //   896c2420             | je                  0x5c

        $sequence_9 = { ffc9 488b03 80786300 7405 498bc5 eb12 4863c1 }
            // n = 7, score = 100
            //   ffc9                 | cmp                 dword ptr [esp + 0x74], 0
            //   488b03               | inc                 esi
            //   80786300             | dec                 eax
            //   7405                 | test                edi, edi
            //   498bc5               | je                  0x4f5
            //   eb12                 | inc                 ecx
            //   4863c1               | movzx               eax, word ptr [esi + 0x14]

    condition:
        7 of them and filesize < 14034944
}