rule win_halfrig_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.halfrig."
        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.halfrig"
        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 = { 498bcf 8802 488d542420 e8???????? 488d0d64eb0700 e8???????? }
            // n = 6, score = 100
            //   498bcf               | dec                 eax
            //   8802                 | lea                 edx, [esp + 0x20]
            //   488d542420           | dec                 eax
            //   e8????????           |                     
            //   488d0d64eb0700       | lea                 ecx, [0x74740]
            //   e8????????           |                     

        $sequence_1 = { 498bcf 8802 488d542420 e8???????? 488d0d40470700 e8???????? }
            // n = 6, score = 100
            //   498bcf               | mov                 byte ptr [edx], al
            //   8802                 | dec                 eax
            //   488d542420           | lea                 edx, [esp + 0x20]
            //   e8????????           |                     
            //   488d0d40470700       | dec                 eax
            //   e8????????           |                     

        $sequence_2 = { 488d0d384f0700 e8???????? 40383d???????? 7435 488bd3 4c8bc7 43301438 }
            // n = 7, score = 100
            //   488d0d384f0700       | mov                 edx, esi
            //   e8????????           |                     
            //   40383d????????       |                     
            //   7435                 | nop                 word ptr [eax + eax]
            //   488bd3               | dec                 eax
            //   4c8bc7               | lea                 ecx, [ecx + 0x80]
            //   43301438             | movups              xmm0, xmmword ptr [eax]

        $sequence_3 = { 40883d???????? 4c893d???????? 488d8d30030000 488d05fcf70300 488bd6 }
            // n = 5, score = 100
            //   40883d????????       |                     
            //   4c893d????????       |                     
            //   488d8d30030000       | dec                 eax
            //   488d05fcf70300       | lea                 ecx, [0x48db9]
            //   488bd6               | jne                 0x1e7b

        $sequence_4 = { 4c898ee0000000 3905???????? 7e4a 488d0df0970400 e8???????? }
            // n = 5, score = 100
            //   4c898ee0000000       | dec                 esp
            //   3905????????         |                     
            //   7e4a                 | mov                 eax, esi
            //   488d0df0970400       | dec                 esp
            //   e8????????           |                     

        $sequence_5 = { 4833d0 4981f801040000 72d8 40883d???????? 4c893d???????? 488d8d30030000 488d05ec650300 }
            // n = 7, score = 100
            //   4833d0               | lea                 edx, [esp + 0x20]
            //   4981f801040000       | dec                 eax
            //   72d8                 | lea                 eax, [ebp + 0x330]
            //   40883d????????       |                     
            //   4c893d????????       |                     
            //   488d8d30030000       | dec                 eax
            //   488d05ec650300       | lea                 ecx, [0x46e30]

        $sequence_6 = { 0fb600 498bcf 8802 488d542420 e8???????? 488d0d48040600 e8???????? }
            // n = 7, score = 100
            //   0fb600               | inc                 sp
            //   498bcf               | movq                mm2, mm7
            //   8802                 | inc                 esp
            //   488d542420           | movaps              xmmword ptr [eax - 0x48], xmm1
            //   e8????????           |                     
            //   488d0d48040600       | inc                 sp
            //   e8????????           |                     

        $sequence_7 = { 8801 418b06 3905???????? 0f8ea3000000 488d0dcf4f0700 e8???????? 833d????????ff }
            // n = 7, score = 100
            //   8801                 | mov                 eax, dword ptr [esi]
            //   418b06               | jle                 0xae3
            //   3905????????         |                     
            //   0f8ea3000000         | dec                 eax
            //   488d0dcf4f0700       | lea                 ecx, [0x752cf]
            //   e8????????           |                     
            //   833d????????ff       |                     

        $sequence_8 = { 8801 418b06 3905???????? 0f8ea3000000 488d0defba0700 e8???????? 833d????????ff }
            // n = 7, score = 100
            //   8801                 | mov                 eax, dword ptr [esi]
            //   418b06               | jle                 0xc4b
            //   3905????????         |                     
            //   0f8ea3000000         | dec                 eax
            //   488d0defba0700       | lea                 ecx, [0x761e3]
            //   e8????????           |                     
            //   833d????????ff       |                     

        $sequence_9 = { 40883d???????? 4c893d???????? 488d8d30030000 488d052cfb0400 488bd6 660f1f840000000000 488d8980000000 }
            // n = 7, score = 100
            //   40883d????????       |                     
            //   4c893d????????       |                     
            //   488d8d30030000       | sub                 esp, 0x600
            //   488d052cfb0400       | dec                 esp
            //   488bd6               | mov                 esi, ecx
            //   660f1f840000000000     | dec    eax
            //   488d8980000000       | mov                 dword ptr [esp + 0x20], ebp

    condition:
        7 of them and filesize < 1369088
}