rule win_kerrdown_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.kerrdown"
        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 = { 750e 80fb2b 7409 80fb2f 0f858f000000 8b4de0 8a01 }
            // n = 7, score = 200
            //   750e                 | jne                 0x10
            //   80fb2b               | cmp                 bl, 0x2b
            //   7409                 | je                  0xb
            //   80fb2f               | cmp                 bl, 0x2f
            //   0f858f000000         | jne                 0x95
            //   8b4de0               | mov                 ecx, dword ptr [ebp - 0x20]
            //   8a01                 | mov                 al, byte ptr [ecx]

        $sequence_1 = { e8???????? 8d4c2404 e8???????? 83ec18 8d44241c 8bcc 6aff }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8d4c2404             | lea                 ecx, [esp + 4]
            //   e8????????           |                     
            //   83ec18               | sub                 esp, 0x18
            //   8d44241c             | lea                 eax, [esp + 0x1c]
            //   8bcc                 | mov                 ecx, esp
            //   6aff                 | push                -1

        $sequence_2 = { ff15???????? 6a01 68???????? 68???????? 53 68???????? 6a00 }
            // n = 7, score = 200
            //   ff15????????         |                     
            //   6a01                 | push                1
            //   68????????           |                     
            //   68????????           |                     
            //   53                   | push                ebx
            //   68????????           |                     
            //   6a00                 | push                0

        $sequence_3 = { 50 e8???????? 8b3d???????? 83c40c 8b0d???????? 83ff10 }
            // n = 6, score = 200
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b3d????????         |                     
            //   83c40c               | add                 esp, 0xc
            //   8b0d????????         |                     
            //   83ff10               | cmp                 edi, 0x10

        $sequence_4 = { e8???????? 8b442430 83c418 83f810 722f }
            // n = 5, score = 200
            //   e8????????           |                     
            //   8b442430             | mov                 eax, dword ptr [esp + 0x30]
            //   83c418               | add                 esp, 0x18
            //   83f810               | cmp                 eax, 0x10
            //   722f                 | jb                  0x31

        $sequence_5 = { 8d44241c 8bcc 6aff 6a00 c741140f000000 c7411000000000 }
            // n = 6, score = 200
            //   8d44241c             | lea                 eax, [esp + 0x1c]
            //   8bcc                 | mov                 ecx, esp
            //   6aff                 | push                -1
            //   6a00                 | push                0
            //   c741140f000000       | mov                 dword ptr [ecx + 0x14], 0xf
            //   c7411000000000       | mov                 dword ptr [ecx + 0x10], 0

        $sequence_6 = { 80fb2b 7409 80fb2f 0f858f000000 8b4de0 }
            // n = 5, score = 200
            //   80fb2b               | cmp                 bl, 0x2b
            //   7409                 | je                  0xb
            //   80fb2f               | cmp                 bl, 0x2f
            //   0f858f000000         | jne                 0x95
            //   8b4de0               | mov                 ecx, dword ptr [ebp - 0x20]

        $sequence_7 = { 03c2 3d???????? 762a ff750c 83ff10 }
            // n = 5, score = 200
            //   03c2                 | add                 eax, edx
            //   3d????????           |                     
            //   762a                 | jbe                 0x2c
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   83ff10               | cmp                 edi, 0x10

        $sequence_8 = { 8a01 41 884435e8 46 }
            // n = 4, score = 200
            //   8a01                 | mov                 al, byte ptr [ecx]
            //   41                   | inc                 ecx
            //   884435e8             | mov                 byte ptr [ebp + esi - 0x18], al
            //   46                   | inc                 esi

        $sequence_9 = { ff750c 83ff10 ba???????? b8???????? 0f43d1 b9???????? 2bc2 }
            // n = 7, score = 200
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   83ff10               | cmp                 edi, 0x10
            //   ba????????           |                     
            //   b8????????           |                     
            //   0f43d1               | cmovae              edx, ecx
            //   b9????????           |                     
            //   2bc2                 | sub                 eax, edx

    condition:
        7 of them and filesize < 278528
}