rule win_powershellrunner_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.powershellrunner."
        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.powershellrunner"
        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 = { 488b442428 4883c004 4889442428 4c8b442428 488b542430 488b4c2450 e8???????? }
            // n = 7, score = 200
            //   488b442428           | mov                 dword ptr [esp + 0x68], eax
            //   4883c004             | dec                 eax
            //   4889442428           | mov                 ecx, dword ptr [esp + 0x68]
            //   4c8b442428           | mov                 eax, dword ptr [esp + 0x54]
            //   488b542430           | dec                 eax
            //   488b4c2450           | lea                 eax, [esp + 0xc8]
            //   e8????????           |                     

        $sequence_1 = { eb00 8b442440 488b8c2490010000 4833cc e8???????? }
            // n = 5, score = 200
            //   eb00                 | mov                 byte ptr [esp + 0x73], 0x39
            //   8b442440             | mov                 byte ptr [esp + 0x1af], 0x10
            //   488b8c2490010000     | mov                 byte ptr [esp + 0x1b0], 0x27
            //   4833cc               | mov                 byte ptr [esp + 0x1b1], 0x27
            //   e8????????           |                     

        $sequence_2 = { 488d4c2470 e8???????? 90 488d4c2428 e8???????? 89442420 837c242000 }
            // n = 7, score = 200
            //   488d4c2470           | dec                 eax
            //   e8????????           |                     
            //   90                   | mov                 eax, ecx
            //   488d4c2428           | dec                 eax
            //   e8????????           |                     
            //   89442420             | cmp                 dword ptr [esp + 0x20], eax
            //   837c242000           | jbe                 0x1d9f

        $sequence_3 = { 8b442458 e9???????? 4883bc243801000000 7447 0fb7442470 448bc0 }
            // n = 6, score = 200
            //   8b442458             | dec                 eax
            //   e9????????           |                     
            //   4883bc243801000000     | lea    eax, [ecx + eax + 4]
            //   7447                 | dec                 eax
            //   0fb7442470           | mov                 dword ptr [esp + 0x68], eax
            //   448bc0               | mov                 edx, 2

        $sequence_4 = { 4c8d05fe920000 498bce e8???????? 85c0 0f85a9000000 eb5e }
            // n = 6, score = 200
            //   4c8d05fe920000       | dec                 eax
            //   498bce               | mov                 ecx, dword ptr [esp + 0x60]
            //   e8????????           |                     
            //   85c0                 | dec                 eax
            //   0f85a9000000         | mov                 ecx, dword ptr [esp + 0x68]
            //   eb5e                 | dec                 eax

        $sequence_5 = { 6689842498010000 b86e000000 668984249a010000 b876000000 668984249c010000 }
            // n = 5, score = 200
            //   6689842498010000     | lea                 ecx, [eax + ecx*8]
            //   b86e000000           | dec                 eax
            //   668984249a010000     | lea                 eax, [0x19cbb]
            //   b876000000           | jmp                 0x1491
            //   668984249c010000     | dec                 eax

        $sequence_6 = { 488b442458 4883e804 4889442458 488b4c2458 e8???????? }
            // n = 5, score = 200
            //   488b442458           | mov                 eax, ecx
            //   4883e804             | dec                 eax
            //   4889442458           | cmp                 dword ptr [esp + 0x28], eax
            //   488b4c2458           | jbe                 0x6b8
            //   e8????????           |                     

        $sequence_7 = { 48c7442458feffffff 488b05???????? 4833c4 4889842460040000 b824000000 66898424a0000000 b870000000 }
            // n = 7, score = 200
            //   48c7442458feffffff     | lea    ecx, [esp + 0x58]
            //   488b05????????       |                     
            //   4833c4               | mov                 eax, dword ptr [esp + 0x3c]
            //   4889842460040000     | dec                 eax
            //   b824000000           | cmp                 dword ptr [esp + 0x30], 0
            //   66898424a0000000     | jne                 0x1203
            //   b870000000           | dec                 eax

        $sequence_8 = { 90 488d8c2490000000 e8???????? 90 488d4c2440 e8???????? 90 }
            // n = 7, score = 200
            //   90                   | cmp                 dword ptr [esp + 0x60], eax
            //   488d8c2490000000     | ja                  0xb7d
            //   e8????????           |                     
            //   90                   | dec                 eax
            //   488d4c2440           | mov                 ecx, dword ptr [esp + 0x50]
            //   e8????????           |                     
            //   90                   | dec                 eax

        $sequence_9 = { 4889442438 4c8b442438 488d542420 488d4c2460 e8???????? 0fb6c0 85c0 }
            // n = 7, score = 200
            //   4889442438           | mov                 byte ptr [esp + 0x1fc], 0x30
            //   4c8b442438           | mov                 byte ptr [esp + 0x1fd], 0x27
            //   488d542420           | mov                 byte ptr [esp + 0x1fe], 0x26
            //   488d4c2460           | mov                 byte ptr [esp + 0x1ff], 0x3c
            //   e8????????           |                     
            //   0fb6c0               | mov                 byte ptr [esp + 0x200], 0x3a
            //   85c0                 | mov                 byte ptr [esp + 0x201], 0x3b

    condition:
        7 of them and filesize < 458752
}