rule win_fusiondrive_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.fusiondrive."
        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.fusiondrive"
        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 = { 83f909 72ea c605????????00 c3 803d????????00 7426 }
            // n = 6, score = 100
            //   83f909               | dec                 ecx
            //   72ea                 | mov                 ecx, dword ptr [esi]
            //   c605????????00       |                     
            //   c3                   | inc                 esp
            //   803d????????00       |                     
            //   7426                 | add                 edi, eax

        $sequence_1 = { 452bc4 418bd4 4903d6 4c8d4c2458 41ff5218 397c2458 7605 }
            // n = 7, score = 100
            //   452bc4               | and                 eax, 0x3f
            //   418bd4               | dec                 ebp
            //   4903d6               | mov                 ebp, esp
            //   4c8d4c2458           | dec                 ecx
            //   41ff5218             | sar                 ebp, 6
            //   397c2458             | dec                 ebp
            //   7605                 | cmp                 eax, esp

        $sequence_2 = { 428a8c11b8150100 482bd0 8b42fc 49895108 d3e8 41894120 }
            // n = 6, score = 100
            //   428a8c11b8150100     | lea                 eax, [0x16bb8]
            //   482bd0               | cmp                 dword ptr [edx + 0xc], eax
            //   8b42fc               | je                  0x43a
            //   49895108             | dec                 eax
            //   d3e8                 | arpl                word ptr [edx + 0xc], dx
            //   41894120             | dec                 ecx

        $sequence_3 = { c705????????01000000 b808000000 486bc000 488d0da6a00100 8b542430 48891401 488d0da7e20000 }
            // n = 7, score = 100
            //   c705????????01000000     |     
            //   b808000000           | mov                 dword ptr [ecx + 0x1c], eax
            //   486bc000             | movzx               ecx, byte ptr [edx]
            //   488d0da6a00100       | and                 ecx, 0xf
            //   8b542430             | dec                 edx
            //   48891401             | movsx               eax, byte ptr [ecx + edx + 0x115a8]
            //   488d0da7e20000       | mov                 eax, dword ptr [edx - 4]

        $sequence_4 = { 448be7 897c2458 488b4b20 4c8b11 }
            // n = 4, score = 100
            //   448be7               | movsx               eax, byte ptr [ecx + ecx + 0x115a8]
            //   897c2458             | inc                 ecx
            //   488b4b20             | mov                 dword ptr [eax + 0x1c], eax
            //   4c8b11               | movzx               ecx, byte ptr [edx]

        $sequence_5 = { 4d8be1 498be8 4c8bea 498b84ff00da0100 }
            // n = 4, score = 100
            //   4d8be1               | add                 esp, 0x20
            //   498be8               | dec                 eax
            //   4c8bea               | lea                 eax, [0x63a8]
            //   498b84ff00da0100     | dec                 eax

        $sequence_6 = { 428a8c19b8150100 482bd0 8b42fc d3e8 41894024 }
            // n = 5, score = 100
            //   428a8c19b8150100     | dec                 eax
            //   482bd0               | lea                 ecx, [ebp + 0x27]
            //   8b42fc               | dec                 eax
            //   d3e8                 | cmp                 dword ptr [ebp + 0x3f], 8
            //   41894024             | mov                 dword ptr [esp + 0x60], 0x6e72656b

        $sequence_7 = { 488d0d0b9b0000 e8???????? 488b4308 833800 750e }
            // n = 5, score = 100
            //   488d0d0b9b0000       | mov                 ebp, edx
            //   e8????????           |                     
            //   488b4308             | inc                 esp
            //   833800               | mov                 edi, ebx
            //   750e                 | dec                 eax

        $sequence_8 = { 488bca 4c8d0511060100 83e13f 488bc2 48c1f806 488d0cc9 }
            // n = 6, score = 100
            //   488bca               | dec                 eax
            //   4c8d0511060100       | sub                 esp, 0x20
            //   83e13f               | dec                 eax
            //   488bc2               | mov                 ebx, edx
            //   48c1f806             | dec                 esp
            //   488d0cc9             | lea                 ecx, [0x81c8]

        $sequence_9 = { eb0b 4803f6 418b84f708560100 85c0 7816 3de4000000 }
            // n = 6, score = 100
            //   eb0b                 | dec                 esp
            //   4803f6               | mov                 esi, dword ptr [esp + 0x60]
            //   418b84f708560100     | ja                  0x1b5
            //   85c0                 | dec                 eax
            //   7816                 | mov                 edx, ecx
            //   3de4000000           | dec                 ecx

    condition:
        7 of them and filesize < 290816
}