rule win_crosswalk_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.crosswalk"
        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 = { 33f6 8d6e20 8bcd e8???????? }
            // n = 4, score = 1300
            //   33f6                 | inc                 ecx
            //   8d6e20               | sub                 edi, 1
            //   8bcd                 | jne                 0xfffffff1
            //   e8????????           |                     

        $sequence_1 = { d3ca 03d0 4183ef01 75ef }
            // n = 4, score = 1300
            //   d3ca                 | mov                 eax, eax
            //   03d0                 | imul                ecx
            //   4183ef01             | add                 edx, ecx
            //   75ef                 | sar                 edx, 0xb

        $sequence_2 = { 4c8bc6 33d2 410fbe00 49ffc0 d3ca 03d0 }
            // n = 6, score = 1300
            //   4c8bc6               | add                 edx, eax
            //   33d2                 | dec                 esp
            //   410fbe00             | mov                 eax, esi
            //   49ffc0               | xor                 edx, edx
            //   d3ca                 | inc                 ecx
            //   03d0                 | movsx               eax, byte ptr [eax]

        $sequence_3 = { 458d7ee0 418bd7 ff15???????? 4821742420 }
            // n = 4, score = 1300
            //   458d7ee0             | mov                 eax, edx
            //   418bd7               | shr                 eax, 0x1f
            //   ff15????????         |                     
            //   4821742420           | add                 edx, eax

        $sequence_4 = { c1e81f 03d0 69c2890e0000 3bc8 }
            // n = 4, score = 1300
            //   c1e81f               | inc                 ecx
            //   03d0                 | mov                 eax, eax
            //   69c2890e0000         | imul                ecx
            //   3bc8                 | add                 edx, ecx

        $sequence_5 = { 458bc6 33d2 488bc8 e8???????? 4533c9 }
            // n = 5, score = 1300
            //   458bc6               | mov                 eax, edx
            //   33d2                 | shr                 eax, 0x1f
            //   488bc8               | add                 edx, eax
            //   e8????????           |                     
            //   4533c9               | imul                eax, edx, 0xe89

        $sequence_6 = { ff15???????? 448bf0 4533c9 4533c0 }
            // n = 4, score = 1300
            //   ff15????????         |                     
            //   448bf0               | shr                 eax, 0x1f
            //   4533c9               | add                 edx, eax
            //   4533c0               | imul                eax, edx, 0xe89

        $sequence_7 = { 418bc0 f7e9 03d1 c1fa0b 8bc2 c1e81f 03d0 }
            // n = 7, score = 1300
            //   418bc0               | inc                 ecx
            //   f7e9                 | mov                 eax, eax
            //   03d1                 | imul                ecx
            //   c1fa0b               | add                 edx, ecx
            //   8bc2                 | sar                 edx, 0xb
            //   c1e81f               | mov                 eax, edx
            //   03d0                 | shr                 eax, 0x1f

        $sequence_8 = { a1???????? 897de0 394508 7c1f 3934bd808e4100 7531 e8???????? }
            // n = 7, score = 200
            //   a1????????           |                     
            //   897de0               | cmp                 ecx, eax
            //   394508               | inc                 ecx
            //   7c1f                 | mov                 eax, 0x8ce6568d
            //   3934bd808e4100       | inc                 ecx
            //   7531                 | mov                 eax, eax
            //   e8????????           |                     

        $sequence_9 = { f20f59db 660f282d???????? 660f59f5 660f28aa80594100 }
            // n = 4, score = 200
            //   f20f59db             | sar                 edx, 0xb
            //   660f282d????????     |                     
            //   660f59f5             | inc                 ecx
            //   660f28aa80594100     | mov                 eax, 0x8ce6568d

        $sequence_10 = { 53 56 8b0485808e4100 33db 8b7508 }
            // n = 5, score = 200
            //   53                   | shr                 eax, 0x1f
            //   56                   | dec                 esp
            //   8b0485808e4100       | mov                 eax, esi
            //   33db                 | xor                 edx, edx
            //   8b7508               | inc                 ecx

        $sequence_11 = { 6a00 8d78f4 57 56 }
            // n = 4, score = 200
            //   6a00                 | imul                ecx
            //   8d78f4               | add                 edx, ecx
            //   57                   | sar                 edx, 0xb
            //   56                   | mov                 eax, edx

        $sequence_12 = { c745e0245b4100 8b4508 8bcf 8b7510 dd00 8b450c dd5de4 }
            // n = 7, score = 200
            //   c745e0245b4100       | xor                 edx, edx
            //   8b4508               | inc                 ecx
            //   8bcf                 | movsx               eax, byte ptr [eax]
            //   8b7510               | dec                 ecx
            //   dd00                 | inc                 eax
            //   8b450c               | ror                 edx, cl
            //   dd5de4               | inc                 esp

        $sequence_13 = { 8b04bd808e4100 f644032801 7444 837c0318ff 743d }
            // n = 5, score = 200
            //   8b04bd808e4100       | inc                 ecx
            //   f644032801           | sub                 edi, 1
            //   7444                 | shr                 eax, 0x1f
            //   837c0318ff           | add                 edx, eax
            //   743d                 | imul                eax, edx, 0xe89

        $sequence_14 = { 8be5 5d c3 6a40 6800100000 50 }
            // n = 6, score = 200
            //   8be5                 | inc                 ecx
            //   5d                   | mov                 eax, eax
            //   c3                   | imul                ecx
            //   6a40                 | add                 edx, ecx
            //   6800100000           | sar                 edx, 0xb
            //   50                   | mov                 eax, edx

        $sequence_15 = { 660f28aa80594100 660f54e5 660f58fe 660f58fc 660f59c8 }
            // n = 5, score = 200
            //   660f28aa80594100     | movsx               eax, byte ptr [eax]
            //   660f54e5             | dec                 ecx
            //   660f58fe             | inc                 eax
            //   660f58fc             | ror                 edx, cl
            //   660f59c8             | add                 edx, eax

    condition:
        7 of them and filesize < 286720
}