rule win_crosswalk_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.crosswalk"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { ff15???????? 448bf0 4533c9 4533c0 }
            // n = 4, score = 1300
            //   ff15????????         |                     
            //   448bf0               | sub                 edi, 1
            //   4533c9               | jne                 0xfffffff7
            //   4533c0               | add                 edx, ecx

        $sequence_1 = { 33d2 488bc8 e8???????? 4533c9 4533c0 33d2 }
            // n = 6, score = 1300
            //   33d2                 | xor                 edx, edx
            //   488bc8               | dec                 eax
            //   e8????????           |                     
            //   4533c9               | mov                 ecx, eax
            //   4533c0               | inc                 ebp
            //   33d2                 | xor                 ecx, ecx

        $sequence_2 = { 4c8bc6 33d2 410fbe00 49ffc0 d3ca }
            // n = 5, score = 1300
            //   4c8bc6               | sar                 edx, 0xb
            //   33d2                 | mov                 eax, edx
            //   410fbe00             | shr                 eax, 0x1f
            //   49ffc0               | add                 edx, eax
            //   d3ca                 | imul                eax, edx, 0xe89

        $sequence_3 = { 41b88d56e68c 418bc0 f7e9 03d1 c1fa0b 8bc2 }
            // n = 6, score = 1300
            //   41b88d56e68c         | and                 dword ptr [esp + 0x20], esi
            //   418bc0               | sar                 edx, 0xb
            //   f7e9                 | mov                 eax, edx
            //   03d1                 | shr                 eax, 0x1f
            //   c1fa0b               | add                 edx, eax
            //   8bc2                 | imul                eax, edx, 0xe89

        $sequence_4 = { 458d7ee0 418bd7 ff15???????? 4821742420 }
            // n = 4, score = 1300
            //   458d7ee0             | inc                 ebp
            //   418bd7               | xor                 eax, eax
            //   ff15????????         |                     
            //   4821742420           | xor                 edx, edx

        $sequence_5 = { 49ffc0 d3ca 03d0 4183ef01 75ef }
            // n = 5, score = 1300
            //   49ffc0               | inc                 ecx
            //   d3ca                 | mov                 eax, 0x8ce6568d
            //   03d0                 | inc                 ecx
            //   4183ef01             | mov                 eax, eax
            //   75ef                 | imul                ecx

        $sequence_6 = { 33f6 8d6e20 8bcd e8???????? }
            // n = 4, score = 1300
            //   33f6                 | cmp                 ecx, eax
            //   8d6e20               | inc                 ecx
            //   8bcd                 | movsx               eax, byte ptr [eax]
            //   e8????????           |                     

        $sequence_7 = { c1fa0b 8bc2 c1e81f 03d0 69c2890e0000 }
            // n = 5, score = 1300
            //   c1fa0b               | inc                 ebp
            //   8bc2                 | lea                 edi, [esi - 0x20]
            //   c1e81f               | inc                 ecx
            //   03d0                 | mov                 edx, edi
            //   69c2890e0000         | dec                 eax

        $sequence_8 = { c70021000000 e9???????? 894ddc c745e0185b4100 e9???????? c745e0145b4100 eba2 }
            // n = 7, score = 200
            //   c70021000000         | mov                 eax, esi
            //   e9????????           |                     
            //   894ddc               | xor                 edx, edx
            //   c745e0185b4100       | dec                 eax
            //   e9????????           |                     
            //   c745e0145b4100       | mov                 ecx, eax
            //   eba2                 | inc                 ebp

        $sequence_9 = { 8904bd808e4100 85c0 7514 6a0c 5e 8975e4 c745fcfeffffff }
            // n = 7, score = 200
            //   8904bd808e4100       | mov                 eax, eax
            //   85c0                 | imul                ecx
            //   7514                 | add                 edx, ecx
            //   6a0c                 | sar                 edx, 0xb
            //   5e                   | mov                 eax, edx
            //   8975e4               | shr                 eax, 0x1f
            //   c745fcfeffffff       | add                 edx, eax

        $sequence_10 = { 83e03f 6bd030 8955e0 8b048d808e4100 }
            // n = 4, score = 200
            //   83e03f               | inc                 ecx
            //   6bd030               | sub                 edi, 1
            //   8955e0               | jne                 0xfffffff9
            //   8b048d808e4100       | inc                 ebp

        $sequence_11 = { 8bec 8b4d08 33c0 3b0cc5501c4100 7427 40 83f82d }
            // n = 7, score = 200
            //   8bec                 | xor                 ecx, ecx
            //   8b4d08               | inc                 ebp
            //   33c0                 | lea                 edi, [esi - 0x20]
            //   3b0cc5501c4100       | inc                 ecx
            //   7427                 | mov                 edx, edi
            //   40                   | dec                 eax
            //   83f82d               | and                 dword ptr [esp + 0x20], esi

        $sequence_12 = { 8b55d4 8a07 8b0c95808e4100 8844192e 8b0495808e4100 }
            // n = 5, score = 200
            //   8b55d4               | dec                 ecx
            //   8a07                 | inc                 eax
            //   8b0c95808e4100       | ror                 edx, cl
            //   8844192e             | add                 edx, eax
            //   8b0495808e4100       | inc                 ecx

        $sequence_13 = { 50 ff7304 57 56 ff15???????? 85c0 }
            // n = 6, score = 200
            //   50                   | sar                 edx, 0xb
            //   ff7304               | dec                 ecx
            //   57                   | inc                 eax
            //   56                   | ror                 edx, cl
            //   ff15????????         |                     
            //   85c0                 | add                 edx, eax

        $sequence_14 = { 0f850c120000 8d0dc0584100 ba1b000000 e9???????? a900000080 7517 ebd4 }
            // n = 7, score = 200
            //   0f850c120000         | imul                eax, edx, 0xe89
            //   8d0dc0584100         | cmp                 ecx, eax
            //   ba1b000000           | ror                 edx, cl
            //   e9????????           |                     
            //   a900000080           | add                 edx, eax
            //   7517                 | inc                 ecx
            //   ebd4                 | sub                 edi, 1

        $sequence_15 = { eb17 894638 eb0e c74634f41a4100 c7463806000000 }
            // n = 5, score = 200
            //   eb17                 | dec                 esp
            //   894638               | mov                 eax, esi
            //   eb0e                 | xor                 edx, edx
            //   c74634f41a4100       | inc                 ecx
            //   c7463806000000       | movsx               eax, byte ptr [eax]

    condition:
        7 of them and filesize < 286720
}