rule win_client_maximus_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.client_maximus."
        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.client_maximus"
        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 = { 83c601 39730c 7fe1 891424 e8???????? 8b4304 85c0 }
            // n = 7, score = 300
            //   83c601               | add                 esi, 1
            //   39730c               | cmp                 dword ptr [ebx + 0xc], esi
            //   7fe1                 | jg                  0xffffffe3
            //   891424               | mov                 dword ptr [esp], edx
            //   e8????????           |                     
            //   8b4304               | mov                 eax, dword ptr [ebx + 4]
            //   85c0                 | test                eax, eax

        $sequence_1 = { 7409 c70424???????? ffd2 8d65f8 5b 5e }
            // n = 6, score = 300
            //   7409                 | je                  0xb
            //   c70424????????       |                     
            //   ffd2                 | call                edx
            //   8d65f8               | lea                 esp, [ebp - 8]
            //   5b                   | pop                 ebx
            //   5e                   | pop                 esi

        $sequence_2 = { 85c0 7535 c70424???????? ff15???????? 83ec04 85c0 }
            // n = 6, score = 300
            //   85c0                 | test                eax, eax
            //   7535                 | jne                 0x37
            //   c70424????????       |                     
            //   ff15????????         |                     
            //   83ec04               | sub                 esp, 4
            //   85c0                 | test                eax, eax

        $sequence_3 = { c744240414000000 890424 ff15???????? 83ec08 85c0 }
            // n = 5, score = 300
            //   c744240414000000     | mov                 dword ptr [esp + 4], 0x14
            //   890424               | mov                 dword ptr [esp], eax
            //   ff15????????         |                     
            //   83ec08               | sub                 esp, 8
            //   85c0                 | test                eax, eax

        $sequence_4 = { 7418 8b5014 85d2 7511 8b5034 85d2 }
            // n = 6, score = 300
            //   7418                 | je                  0x1a
            //   8b5014               | mov                 edx, dword ptr [eax + 0x14]
            //   85d2                 | test                edx, edx
            //   7511                 | jne                 0x13
            //   8b5034               | mov                 edx, dword ptr [eax + 0x34]
            //   85d2                 | test                edx, edx

        $sequence_5 = { c744240800800000 c744240400000000 890424 8954240c }
            // n = 4, score = 300
            //   c744240800800000     | mov                 dword ptr [esp + 8], 0x8000
            //   c744240400000000     | mov                 dword ptr [esp + 4], 0
            //   890424               | mov                 dword ptr [esp], eax
            //   8954240c             | mov                 dword ptr [esp + 0xc], edx

        $sequence_6 = { 881403 75d1 5b 5e }
            // n = 4, score = 300
            //   881403               | mov                 byte ptr [ebx + eax], dl
            //   75d1                 | jne                 0xffffffd3
            //   5b                   | pop                 ebx
            //   5e                   | pop                 esi

        $sequence_7 = { ff15???????? c74424083c000000 c744240408000000 890424 ff15???????? 83ec0c }
            // n = 6, score = 300
            //   ff15????????         |                     
            //   c74424083c000000     | mov                 dword ptr [esp + 8], 0x3c
            //   c744240408000000     | mov                 dword ptr [esp + 4], 8
            //   890424               | mov                 dword ptr [esp], eax
            //   ff15????????         |                     
            //   83ec0c               | sub                 esp, 0xc

        $sequence_8 = { 83ec04 a3???????? c7442404???????? 893424 ff15???????? 83ec08 }
            // n = 6, score = 300
            //   83ec04               | sub                 esp, 4
            //   a3????????           |                     
            //   c7442404????????     |                     
            //   893424               | mov                 dword ptr [esp], esi
            //   ff15????????         |                     
            //   83ec08               | sub                 esp, 8

        $sequence_9 = { 8b442420 c70424???????? a3???????? e8???????? b801000000 }
            // n = 5, score = 300
            //   8b442420             | mov                 eax, dword ptr [esp + 0x20]
            //   c70424????????       |                     
            //   a3????????           |                     
            //   e8????????           |                     
            //   b801000000           | mov                 eax, 1

    condition:
        7 of them and filesize < 106496
}