rule win_reactorbot_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.reactorbot."
        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.reactorbot"
        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 = { 6808020000 8d95d8fbffff 52 ff15???????? }
            // n = 4, score = 900
            //   6808020000           | push                0x208
            //   8d95d8fbffff         | lea                 edx, [ebp - 0x428]
            //   52                   | push                edx
            //   ff15????????         |                     

        $sequence_1 = { 8b4dfc 51 6a00 ff15???????? 50 ff15???????? 8945f8 }
            // n = 7, score = 900
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   51                   | push                ecx
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8945f8               | mov                 dword ptr [ebp - 8], eax

        $sequence_2 = { 8d8d88fbffff 51 e8???????? 8b9590fdffff 83e210 }
            // n = 5, score = 900
            //   8d8d88fbffff         | lea                 ecx, [ebp - 0x478]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   8b9590fdffff         | mov                 edx, dword ptr [ebp - 0x270]
            //   83e210               | and                 edx, 0x10

        $sequence_3 = { 50 ff15???????? 83c408 c745f401000000 8b45f4 }
            // n = 5, score = 900
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83c408               | add                 esp, 8
            //   c745f401000000       | mov                 dword ptr [ebp - 0xc], 1
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]

        $sequence_4 = { e8???????? 6850020000 8d8590fdffff 50 ff15???????? }
            // n = 5, score = 900
            //   e8????????           |                     
            //   6850020000           | push                0x250
            //   8d8590fdffff         | lea                 eax, [ebp - 0x270]
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_5 = { 8b45f8 8945ec eb13 8b4df8 51 6a00 ff15???????? }
            // n = 7, score = 900
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   eb13                 | jmp                 0x15
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   51                   | push                ecx
            //   6a00                 | push                0
            //   ff15????????         |                     

        $sequence_6 = { c745e800000000 c745e400000000 a1???????? 8945e0 8b4d08 }
            // n = 5, score = 900
            //   c745e800000000       | mov                 dword ptr [ebp - 0x18], 0
            //   c745e400000000       | mov                 dword ptr [ebp - 0x1c], 0
            //   a1????????           |                     
            //   8945e0               | mov                 dword ptr [ebp - 0x20], eax
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]

        $sequence_7 = { 50 ff15???????? 8d8d90fdffff 51 8d9580f9ffff 52 }
            // n = 6, score = 900
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8d8d90fdffff         | lea                 ecx, [ebp - 0x270]
            //   51                   | push                ecx
            //   8d9580f9ffff         | lea                 edx, [ebp - 0x680]
            //   52                   | push                edx

        $sequence_8 = { 6bc005 83e803 99 b999000000 }
            // n = 4, score = 400
            //   6bc005               | imul                eax, eax, 5
            //   83e803               | sub                 eax, 3
            //   99                   | cdq                 
            //   b999000000           | mov                 ecx, 0x99

        $sequence_9 = { 7402 eb0c c705????????b80b0000 eb0a }
            // n = 4, score = 400
            //   7402                 | je                  4
            //   eb0c                 | jmp                 0xe
            //   c705????????b80b0000     |     
            //   eb0a                 | jmp                 0xc

        $sequence_10 = { 83c005 99 b905000000 f7f9 }
            // n = 4, score = 400
            //   83c005               | add                 eax, 5
            //   99                   | cdq                 
            //   b905000000           | mov                 ecx, 5
            //   f7f9                 | idiv                ecx

        $sequence_11 = { 833d????????00 7509 833d????????00 740b }
            // n = 4, score = 400
            //   833d????????00       |                     
            //   7509                 | jne                 0xb
            //   833d????????00       |                     
            //   740b                 | je                  0xd

        $sequence_12 = { 83e101 f7d9 81e12083b8ed 33c1 }
            // n = 4, score = 400
            //   83e101               | and                 ecx, 1
            //   f7d9                 | neg                 ecx
            //   81e12083b8ed         | and                 ecx, 0xedb88320
            //   33c1                 | xor                 eax, ecx

        $sequence_13 = { 69c0b13a0200 99 83e203 03c2 }
            // n = 4, score = 400
            //   69c0b13a0200         | imul                eax, eax, 0x23ab1
            //   99                   | cdq                 
            //   83e203               | and                 edx, 3
            //   03c2                 | add                 eax, edx

        $sequence_14 = { e9???????? 488b8c2488000000 ff15???????? 488d15fd010100 488d8c24c0340000 }
            // n = 5, score = 200
            //   e9????????           |                     
            //   488b8c2488000000     | dec                 eax
            //   ff15????????         |                     
            //   488d15fd010100       | mov                 ecx, dword ptr [esp + 0x88]
            //   488d8c24c0340000     | dec                 eax

        $sequence_15 = { ba00100000 488d8c24c0440000 ff15???????? 448b44247c 488d1570450000 488d8c24c0440000 }
            // n = 6, score = 200
            //   ba00100000           | lea                 edx, [0x101fd]
            //   488d8c24c0440000     | dec                 eax
            //   ff15????????         |                     
            //   448b44247c           | lea                 ecx, [esp + 0x34c0]
            //   488d1570450000       | mov                 edx, 0x1000
            //   488d8c24c0440000     | dec                 eax

    condition:
        7 of them and filesize < 1032192
}