rule win_shady_hammock_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.shady_hammock."
        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.shady_hammock"
        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 = { 33db 4885c9 7809 488d5602 4803d1 eb03 }
            // n = 6, score = 200
            //   33db                 | add                 ecx, ebx
            //   4885c9               | dec                 eax
            //   7809                 | mov                 dword ptr [esp + 0x20], esi
            //   488d5602             | dec                 esp
            //   4803d1               | cmovae              ecx, dword ptr [ebp - 0x21]
            //   eb03                 | inc                 ebp

        $sequence_1 = { 498b4d00 4885c9 7439 33db 4885c9 7809 488d5602 }
            // n = 7, score = 200
            //   498b4d00             | vmovdqu             xmmword ptr [ebp - 0x51], xmm0
            //   4885c9               | dec                 eax
            //   7439                 | mov                 ebx, dword ptr [ebp + 0x57]
            //   33db                 | dec                 esp
            //   4885c9               | lea                 eax, [ebp - 0x51]
            //   7809                 | inc                 ebp
            //   488d5602             | mov                 cl, dh

        $sequence_2 = { 4883653f00 48c745470f000000 c6452f00 e8???????? 83cfff 3bc7 0f8405010000 }
            // n = 7, score = 200
            //   4883653f00           | dec                 esp
            //   48c745470f000000     | mov                 ecx, dword ptr [esp + 0xc8]
            //   c6452f00             | dec                 esp
            //   e8????????           |                     
            //   83cfff               | lea                 eax, [0x397e0]
            //   3bc7                 | dec                 eax
            //   0f8405010000         | mov                 ebp, edx

        $sequence_3 = { 8b82b0000000 4803c8 4903c9 4a8d1408 eb67 837a0400 }
            // n = 6, score = 200
            //   8b82b0000000         | mov                 ecx, dword ptr [ebp + 0x37]
            //   4803c8               | dec                 eax
            //   4903c9               | xor                 ecx, esp
            //   4a8d1408             | dec                 eax
            //   eb67                 | cmp                 esi, 0x39
            //   837a0400             | jb                  0xfc2

        $sequence_4 = { 7407 e8???????? ebef 33f6 48896f10 498d2c36 48895f18 }
            // n = 7, score = 200
            //   7407                 | inc                 ecx
            //   e8????????           |                     
            //   ebef                 | mov                 ebp, 0x1000
            //   33f6                 | je                  0x222
            //   48896f10             | dec                 eax
            //   498d2c36             | mov                 eax, dword ptr [edi]
            //   48895f18             | dec                 eax

        $sequence_5 = { 488d4d2f e8???????? 4c8b5368 488d4d2f 48837d4710 0f93c2 }
            // n = 6, score = 200
            //   488d4d2f             | lea                 ecx, [0x2edce]
            //   e8????????           |                     
            //   4c8b5368             | dec                 esp
            //   488d4d2f             | mov                 ecx, ecx
            //   48837d4710           | inc                 ecx
            //   0f93c2               | cmp                 byte ptr [ecx + 0x39], 0

        $sequence_6 = { 8ad0 488d4d2f e8???????? 4c8b5368 488d4d2f }
            // n = 5, score = 200
            //   8ad0                 | dec                 eax
            //   488d4d2f             | sub                 esp, 0x28
            //   e8????????           |                     
            //   4c8b5368             | inc                 ecx
            //   488d4d2f             | mov                 ecx, 1

        $sequence_7 = { 742f 0fb77c4a08 beff0f0000 0fb7c7 6623fe }
            // n = 5, score = 200
            //   742f                 | dec                 eax
            //   0fb77c4a08           | test                eax, eax
            //   beff0f0000           | jne                 0xa89
            //   0fb7c7               | dec                 eax
            //   6623fe               | mov                 eax, edi

        $sequence_8 = { 488bcd e8???????? 498d5701 41c6042c00 4881fa00100000 7218 }
            // n = 6, score = 200
            //   488bcd               | mov                 ecx, ebx
            //   e8????????           |                     
            //   498d5701             | dec                 eax
            //   41c6042c00           | lea                 edx, [esp + 0x20]
            //   4881fa00100000       | vmovdqu             xmmword ptr [esp + 0x20], xmm0
            //   7218                 | vmovups             xmm0, xmmword ptr [edi]

        $sequence_9 = { 0fb74c4420 6643890c46 49ffc0 4983f81d }
            // n = 4, score = 200
            //   0fb74c4420           | xor                 edx, edx
            //   6643890c46           | ja                  0x365
            //   49ffc0               | nop                 word ptr [eax + eax]
            //   4983f81d             | inc                 edi

    condition:
        7 of them and filesize < 635904
}