rule win_echo_gather_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.echo_gather."
        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.echo_gather"
        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 = { 4889c1 488b4510 4989d8 4889c2 e8???????? 8945ec }
            // n = 6, score = 100
            //   4889c1               | jne                 0xd47
            //   488b4510             | inc                 ecx
            //   4989d8               | cmp                 byte ptr [eax], 0
            //   4889c2               | dec                 ebp
            //   e8????????           |                     
            //   8945ec               | test                eax, eax

        $sequence_1 = { 89442454 e9???????? 8b842498000000 4489742468 89442448 e9???????? 660fefc9 }
            // n = 7, score = 100
            //   89442454             | dec                 eax
            //   e9????????           |                     
            //   8b842498000000       | mov                 ecx, eax
            //   4489742468           | call                eax
            //   89442448             | mov                 eax, 0
            //   e9????????           |                     
            //   660fefc9             | dec                 eax

        $sequence_2 = { 488b8424c8050000 4889c1 488b05???????? ffd0 4883bc24d005000000 }
            // n = 5, score = 100
            //   488b8424c8050000     | je                  0x3f1
            //   4889c1               | jne                 0x96
            //   488b05????????       |                     
            //   ffd0                 | inc                 ecx
            //   4883bc24d005000000     | mov    eax, dword ptr [ebp + 4]

        $sequence_3 = { 48894d10 48895518 4c894520 488d05372c0000 4889442420 488d05322c0000 4889442428 }
            // n = 7, score = 100
            //   48894d10             | mov                 ecx, eax
            //   48895518             | call                eax
            //   4c894520             | dec                 eax
            //   488d05372c0000       | mov                 dword ptr [ebp - 0x28], 0
            //   4889442420           | dec                 eax
            //   488d05322c0000       | mov                 eax, dword ptr [ebp - 0x18]
            //   4889442428           | dec                 eax

        $sequence_4 = { 8b4e08 8b462c 4889f2 894610 89c8 83e120 0dc0010000 }
            // n = 7, score = 100
            //   8b4e08               | cmp                 edi, eax
            //   8b462c               | jl                  0x932
            //   4889f2               | mov                 dword ptr [ebx + 0xc], 0xffffffff
            //   894610               | dec                 eax
            //   89c8                 | lea                 ebp, [esp + 0x38]
            //   83e120               | dec                 esp
            //   0dc0010000           | lea                 esp, [esp + 0x40]

        $sequence_5 = { 488945d0 48837dd000 750e 488b45e0 4889c1 e8???????? }
            // n = 6, score = 100
            //   488945d0             | mov                 dword ptr [ebp - 0x10], eax
            //   48837dd000           | dec                 esp
            //   750e                 | mov                 eax, dword ptr [ebp - 0x10]
            //   488b45e0             | dec                 eax
            //   4889c1               | mov                 ecx, dword ptr [ebp + 0x20]
            //   e8????????           |                     

        $sequence_6 = { 4889ef 4183c001 4c89ed 458802 e9???????? 448b4c2448 }
            // n = 6, score = 100
            //   4889ef               | mov                 dword ptr [esp + 0x94], 0
            //   4183c001             | mov                 dword ptr [esp + 0x9c], 0xffffffff
            //   4c89ed               | test                eax, eax
            //   458802               | je                  0x1dcd
            //   e9????????           |                     
            //   448b4c2448           | mov                 word ptr [esp + 0x4e0], 0

        $sequence_7 = { 4881faffffff7f 7744 4c8d942490000000 4c894c2420 4989c1 4c89542448 }
            // n = 6, score = 100
            //   4881faffffff7f       | dec                 eax
            //   7744                 | mov                 dword ptr [ebp - 0x18], 0
            //   4c8d942490000000     | dec                 eax
            //   4c894c2420           | lea                 ecx, [ebp - 0x28]
            //   4989c1               | mov                 edx, dword ptr [ebp - 0xc]
            //   4c89542448           | dec                 eax

        $sequence_8 = { 4885db 0f84e1fdffff e9???????? 4c09c6 41bc57000780 0f850cfeffff 4d85c9 }
            // n = 7, score = 100
            //   4885db               | je                  0x1a9b
            //   0f84e1fdffff         | mov                 eax, 0
            //   e9????????           |                     
            //   4c09c6               | dec                 eax
            //   41bc57000780         | mov                 eax, dword ptr [ebp + 0x10]
            //   0f850cfeffff         | dec                 eax
            //   4d85c9               | mov                 ecx, eax

        $sequence_9 = { e8???????? 488b542430 4889c1 4889c6 e8???????? 4c8b4c2430 448b442438 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   488b542430           | inc                 esp
            //   4889c1               | mov                 edx, ebp
            //   4889c6               | dec                 eax
            //   e8????????           |                     
            //   4c8b4c2430           | mov                 ecx, eax
            //   448b442438           | inc                 ebp

    condition:
        7 of them and filesize < 246784
}