rule win_ratel_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.ratel."
        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.ratel"
        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 = { 890424 ff5230 89c2 83ec08 8b45d0 39d6 ba01000000 }
            // n = 7, score = 100
            //   890424               | mov                 dword ptr [esp], eax
            //   ff5230               | call                dword ptr [edx + 0x30]
            //   89c2                 | mov                 edx, eax
            //   83ec08               | sub                 esp, 8
            //   8b45d0               | mov                 eax, dword ptr [ebp - 0x30]
            //   39d6                 | cmp                 esi, edx
            //   ba01000000           | mov                 edx, 1

        $sequence_1 = { 8b4510 8b5514 85db 7570 8b59fc 8d73ff 8971fc }
            // n = 7, score = 100
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   8b5514               | mov                 edx, dword ptr [ebp + 0x14]
            //   85db                 | test                ebx, ebx
            //   7570                 | jne                 0x72
            //   8b59fc               | mov                 ebx, dword ptr [ecx - 4]
            //   8d73ff               | lea                 esi, [ebx - 1]
            //   8971fc               | mov                 dword ptr [ecx - 4], esi

        $sequence_2 = { 8b4d10 837d14ff 0f94c2 85c9 0f95c0 20d0 8845b8 }
            // n = 7, score = 100
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   837d14ff             | cmp                 dword ptr [ebp + 0x14], -1
            //   0f94c2               | sete                dl
            //   85c9                 | test                ecx, ecx
            //   0f95c0               | setne               al
            //   20d0                 | and                 al, dl
            //   8845b8               | mov                 byte ptr [ebp - 0x48], al

        $sequence_3 = { c645aa00 85f6 0f840afeffff 0fb64db0 ba0f000000 8d7e01 884dbc }
            // n = 7, score = 100
            //   c645aa00             | mov                 byte ptr [ebp - 0x56], 0
            //   85f6                 | test                esi, esi
            //   0f840afeffff         | je                  0xfffffe10
            //   0fb64db0             | movzx               ecx, byte ptr [ebp - 0x50]
            //   ba0f000000           | mov                 edx, 0xf
            //   8d7e01               | lea                 edi, [esi + 1]
            //   884dbc               | mov                 byte ptr [ebp - 0x44], cl

        $sequence_4 = { 8b4108 3b410c 0f826bffffff 8db42600000000 8b01 ff5028 8b4d08 }
            // n = 7, score = 100
            //   8b4108               | mov                 eax, dword ptr [ecx + 8]
            //   3b410c               | cmp                 eax, dword ptr [ecx + 0xc]
            //   0f826bffffff         | jb                  0xffffff71
            //   8db42600000000       | lea                 esi, [esi]
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   ff5028               | call                dword ptr [eax + 0x28]
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]

        $sequence_5 = { 29d3 d1fb 89df bbffffff1f 2b5dd0 39df 0f4edf }
            // n = 7, score = 100
            //   29d3                 | sub                 ebx, edx
            //   d1fb                 | sar                 ebx, 1
            //   89df                 | mov                 edi, ebx
            //   bbffffff1f           | mov                 ebx, 0x1fffffff
            //   2b5dd0               | sub                 ebx, dword ptr [ebp - 0x30]
            //   39df                 | cmp                 edi, ebx
            //   0f4edf               | cmovle              ebx, edi

        $sequence_6 = { c743f8???????? c743fc00000000 c74370c01d4c00 83c418 5b e9???????? 890424 }
            // n = 7, score = 100
            //   c743f8????????       |                     
            //   c743fc00000000       | mov                 dword ptr [ebx - 4], 0
            //   c74370c01d4c00       | mov                 dword ptr [ebx + 0x70], 0x4c1dc0
            //   83c418               | add                 esp, 0x18
            //   5b                   | pop                 ebx
            //   e9????????           |                     
            //   890424               | mov                 dword ptr [esp], eax

        $sequence_7 = { 72ea 897c2418 8b7c241c 750c 8b16 01542414 8b5604 }
            // n = 7, score = 100
            //   72ea                 | jb                  0xffffffec
            //   897c2418             | mov                 dword ptr [esp + 0x18], edi
            //   8b7c241c             | mov                 edi, dword ptr [esp + 0x1c]
            //   750c                 | jne                 0xe
            //   8b16                 | mov                 edx, dword ptr [esi]
            //   01542414             | add                 dword ptr [esp + 0x14], edx
            //   8b5604               | mov                 edx, dword ptr [esi + 4]

        $sequence_8 = { 89942434010000 8b507c 89942438010000 8b9080000000 8994243c010000 8b9084000000 89942440010000 }
            // n = 7, score = 100
            //   89942434010000       | mov                 dword ptr [esp + 0x134], edx
            //   8b507c               | mov                 edx, dword ptr [eax + 0x7c]
            //   89942438010000       | mov                 dword ptr [esp + 0x138], edx
            //   8b9080000000         | mov                 edx, dword ptr [eax + 0x80]
            //   8994243c010000       | mov                 dword ptr [esp + 0x13c], edx
            //   8b9084000000         | mov                 edx, dword ptr [eax + 0x84]
            //   89942440010000       | mov                 dword ptr [esp + 0x140], edx

        $sequence_9 = { b801000000 0f4ef0 0175e4 8b7de4 397de0 0f8488010000 8b75d0 }
            // n = 7, score = 100
            //   b801000000           | mov                 eax, 1
            //   0f4ef0               | cmovle              esi, eax
            //   0175e4               | add                 dword ptr [ebp - 0x1c], esi
            //   8b7de4               | mov                 edi, dword ptr [ebp - 0x1c]
            //   397de0               | cmp                 dword ptr [ebp - 0x20], edi
            //   0f8488010000         | je                  0x18e
            //   8b75d0               | mov                 esi, dword ptr [ebp - 0x30]

    condition:
        7 of them and filesize < 2174976
}