rule win_crylocker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.crylocker."
        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.crylocker"
        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 = { e8???????? 8b442434 83c420 6800010000 8d542420 }
            // n = 5, score = 100
            //   e8????????           |                     
            //   8b442434             | mov                 eax, dword ptr [esp + 0x34]
            //   83c420               | add                 esp, 0x20
            //   6800010000           | push                0x100
            //   8d542420             | lea                 edx, [esp + 0x20]

        $sequence_1 = { 50 ff15???????? 8bf8 897c240c 83ffff }
            // n = 5, score = 100
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8bf8                 | mov                 edi, eax
            //   897c240c             | mov                 dword ptr [esp + 0xc], edi
            //   83ffff               | cmp                 edi, -1

        $sequence_2 = { 8b442438 50 8d4c2448 51 }
            // n = 4, score = 100
            //   8b442438             | mov                 eax, dword ptr [esp + 0x38]
            //   50                   | push                eax
            //   8d4c2448             | lea                 ecx, [esp + 0x48]
            //   51                   | push                ecx

        $sequence_3 = { c744246c10a64000 c744247000000000 e8???????? 8b54240c 8b442408 8d4c244c 51 }
            // n = 7, score = 100
            //   c744246c10a64000     | mov                 dword ptr [esp + 0x6c], 0x40a610
            //   c744247000000000     | mov                 dword ptr [esp + 0x70], 0
            //   e8????????           |                     
            //   8b54240c             | mov                 edx, dword ptr [esp + 0xc]
            //   8b442408             | mov                 eax, dword ptr [esp + 8]
            //   8d4c244c             | lea                 ecx, [esp + 0x4c]
            //   51                   | push                ecx

        $sequence_4 = { 8d542418 52 8bc2 50 68???????? e8???????? }
            // n = 6, score = 100
            //   8d542418             | lea                 edx, [esp + 0x18]
            //   52                   | push                edx
            //   8bc2                 | mov                 eax, edx
            //   50                   | push                eax
            //   68????????           |                     
            //   e8????????           |                     

        $sequence_5 = { 742e 6afe e8???????? 83c404 6a00 68c0270900 }
            // n = 6, score = 100
            //   742e                 | je                  0x30
            //   6afe                 | push                -2
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   6a00                 | push                0
            //   68c0270900           | push                0x927c0

        $sequence_6 = { 83ec6c 8d442418 50 e8???????? }
            // n = 4, score = 100
            //   83ec6c               | sub                 esp, 0x6c
            //   8d442418             | lea                 eax, [esp + 0x18]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_7 = { 8d4c2434 68???????? 51 e8???????? 8d54243c 68???????? 52 }
            // n = 7, score = 100
            //   8d4c2434             | lea                 ecx, [esp + 0x34]
            //   68????????           |                     
            //   51                   | push                ecx
            //   e8????????           |                     
            //   8d54243c             | lea                 edx, [esp + 0x3c]
            //   68????????           |                     
            //   52                   | push                edx

        $sequence_8 = { e8???????? 57 e8???????? 53 e8???????? 8b5c2420 8b7c241c }
            // n = 7, score = 100
            //   e8????????           |                     
            //   57                   | push                edi
            //   e8????????           |                     
            //   53                   | push                ebx
            //   e8????????           |                     
            //   8b5c2420             | mov                 ebx, dword ptr [esp + 0x20]
            //   8b7c241c             | mov                 edi, dword ptr [esp + 0x1c]

        $sequence_9 = { 5e 5b 83c40c c3 83ec0c 56 8d442404 }
            // n = 7, score = 100
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   83c40c               | add                 esp, 0xc
            //   c3                   | ret                 
            //   83ec0c               | sub                 esp, 0xc
            //   56                   | push                esi
            //   8d442404             | lea                 eax, [esp + 4]

    condition:
        7 of them and filesize < 139264
}