rule win_shady_hammock_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 48895f30 8b87d0000000 85c0 740c 488d0c03 488bd3 }
            // n = 6, score = 200
            //   48895f30             | dec                 eax
            //   8b87d0000000         | mov                 dword ptr [ebp + 0x3f], eax
            //   85c0                 | mov                 dword ptr [ebp + 0x1f], 0xfc1419d3
            //   740c                 | xor                 ebx, ebx
            //   488d0c03             | mov                 dword ptr [ebp + 0x1f], 0xfc1419d3
            //   488bd3               | xor                 ebx, ebx

        $sequence_1 = { 488bc8 488bf8 e8???????? 488b0d???????? 4533c9 }
            // n = 5, score = 200
            //   488bc8               | inc                 ecx
            //   488bf8               | movsx               eax, al
            //   e8????????           |                     
            //   488b0d????????       |                     
            //   4533c9               | inc                 ecx

        $sequence_2 = { eb2c 498bcf 488bc3 48d1e9 482bc1 }
            // n = 5, score = 200
            //   eb2c                 | cmp                 esi, edi
            //   498bcf               | dec                 esp
            //   488bc3               | sub                 ebx, eax
            //   48d1e9               | dec                 ecx
            //   482bc1               | mov                 eax, ebx

        $sequence_3 = { 4a8b0c2b 4885c9 75cc ffc5 488d0cad00000000 4803cd }
            // n = 6, score = 200
            //   4a8b0c2b             | dec                 ebp
            //   4885c9               | mov                 esp, dword ptr [ebx + 0x38]
            //   75cc                 | dec                 eax
            //   ffc5                 | add                 eax, ebx
            //   488d0cad00000000     | dec                 esp
            //   4803cd               | lea                 ebx, [esp + 0xc0]

        $sequence_4 = { 4a8d0439 488bda 483bd0 480f42d8 488d4b01 4881f900100000 720a }
            // n = 7, score = 200
            //   4a8d0439             | lea                 edx, [esp + 0x20]
            //   488bda               | vmovups             ymmword ptr [esp + 0x20], ymm0
            //   483bd0               | dec                 eax
            //   480f42d8             | lea                 ecx, [esp + 0x50]
            //   488d4b01             | vzeroupper          
            //   4881f900100000       | jne                 0x7f1
            //   720a                 | mov                 eax, dword ptr [edi + 0xc]

        $sequence_5 = { 48896f10 498d2c36 48895f18 4d8bc6 488bce 4983ff10 724d }
            // n = 7, score = 200
            //   48896f10             | jne                 0x93
            //   498d2c36             | test                ecx, ecx
            //   48895f18             | jne                 0xc1
            //   4d8bc6               | jne                 0xb6
            //   488bce               | dec                 esp
            //   4983ff10             | cmp                 dword ptr [ecx + 0x58], esi
            //   724d                 | mov                 al, 1

        $sequence_6 = { 4863413c 33db 4c8bea 488bf1 8bbc0888000000 }
            // n = 5, score = 200
            //   4863413c             | dec                 eax
            //   33db                 | lea                 ebp, [esp - 0x190]
            //   4c8bea               | int                 0x29
            //   488bf1               | dec                 eax
            //   8bbc0888000000       | lea                 ecx, [0x39106]

        $sequence_7 = { 418b88b4000000 4803d0 418b80b0000000 4903c1 }
            // n = 4, score = 200
            //   418b88b4000000       | inc                 eax
            //   4803d0               | sete                dh
            //   418b80b0000000       | dec                 eax
            //   4903c1               | cmp                 edx, 0x10

        $sequence_8 = { eb09 488bcb 4883fa0f 743b 803d????????00 7432 4883c208 }
            // n = 7, score = 200
            //   eb09                 | call                dword ptr [eax + 0x48]
            //   488bcb               | dec                 ecx
            //   4883fa0f             | cmp                 eax, edi
            //   743b                 | jne                 0x1b69
            //   803d????????00       |                     
            //   7432                 | dec                 eax
            //   4883c208             | test                esi, esi

        $sequence_9 = { 0fb74c4420 6643890c46 49ffc0 4983f81d }
            // n = 4, score = 200
            //   0fb74c4420           | xor                 edx, edx
            //   6643890c46           | jne                 0x259
            //   49ffc0               | dec                 ebp
            //   4983f81d             | mov                 esi, dword ptr [esi + esi*8 + 0x346b0]

    condition:
        7 of them and filesize < 635904
}