rule win_klrd_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.klrd"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 744f 6800010000 8d85e8feffff 50 }
            // n = 4, score = 100
            //   744f                 | je                  0x51
            //   6800010000           | push                0x100
            //   8d85e8feffff         | lea                 eax, [ebp - 0x118]
            //   50                   | push                eax

        $sequence_1 = { ff15???????? 8b8dd0feffff 88840dc0fdffff ebcc 8a85e7feffff 8885acfcffff }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   8b8dd0feffff         | mov                 ecx, dword ptr [ebp - 0x130]
            //   88840dc0fdffff       | mov                 byte ptr [ebp + ecx - 0x240], al
            //   ebcc                 | jmp                 0xffffffce
            //   8a85e7feffff         | mov                 al, byte ptr [ebp - 0x119]
            //   8885acfcffff         | mov                 byte ptr [ebp - 0x354], al

        $sequence_2 = { 8b8dd0feffff 88840dc0fdffff ebcc 8a85e7feffff }
            // n = 4, score = 100
            //   8b8dd0feffff         | mov                 ecx, dword ptr [ebp - 0x130]
            //   88840dc0fdffff       | mov                 byte ptr [ebp + ecx - 0x240], al
            //   ebcc                 | jmp                 0xffffffce
            //   8a85e7feffff         | mov                 al, byte ptr [ebp - 0x119]

        $sequence_3 = { 837d0800 0f85bc020000 817d0c04010000 740d 817d0c00010000 }
            // n = 5, score = 100
            //   837d0800             | cmp                 dword ptr [ebp + 8], 0
            //   0f85bc020000         | jne                 0x2c2
            //   817d0c04010000       | cmp                 dword ptr [ebp + 0xc], 0x104
            //   740d                 | je                  0xf
            //   817d0c00010000       | cmp                 dword ptr [ebp + 0xc], 0x100

        $sequence_4 = { b804100000 e8???????? 56 57 8d450c 50 ff7508 }
            // n = 7, score = 100
            //   b804100000           | mov                 eax, 0x1004
            //   e8????????           |                     
            //   56                   | push                esi
            //   57                   | push                edi
            //   8d450c               | lea                 eax, [ebp + 0xc]
            //   50                   | push                eax
            //   ff7508               | push                dword ptr [ebp + 8]

        $sequence_5 = { 68???????? e8???????? 59 59 eb12 ffb5c8feffff ff15???????? }
            // n = 7, score = 100
            //   68????????           |                     
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   eb12                 | jmp                 0x14
            //   ffb5c8feffff         | push                dword ptr [ebp - 0x138]
            //   ff15????????         |                     

        $sequence_6 = { 7554 6804010000 8d85fcfeffff 50 53 }
            // n = 5, score = 100
            //   7554                 | jne                 0x56
            //   6804010000           | push                0x104
            //   8d85fcfeffff         | lea                 eax, [ebp - 0x104]
            //   50                   | push                eax
            //   53                   | push                ebx

        $sequence_7 = { e9???????? 68???????? e8???????? 59 eb73 68???????? }
            // n = 6, score = 100
            //   e9????????           |                     
            //   68????????           |                     
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   eb73                 | jmp                 0x75
            //   68????????           |                     

        $sequence_8 = { 83a5ccfeffff00 83a5c8feffff00 83a5d0feffff00 83a5d4feffff00 c685b8fcffff00 68ff000000 }
            // n = 6, score = 100
            //   83a5ccfeffff00       | and                 dword ptr [ebp - 0x134], 0
            //   83a5c8feffff00       | and                 dword ptr [ebp - 0x138], 0
            //   83a5d0feffff00       | and                 dword ptr [ebp - 0x130], 0
            //   83a5d4feffff00       | and                 dword ptr [ebp - 0x12c], 0
            //   c685b8fcffff00       | mov                 byte ptr [ebp - 0x348], 0
            //   68ff000000           | push                0xff

        $sequence_9 = { 68???????? e8???????? 59 eb66 68???????? }
            // n = 5, score = 100
            //   68????????           |                     
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   eb66                 | jmp                 0x68
            //   68????????           |                     

    condition:
        7 of them and filesize < 40960
}