rule win_alphanc_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.alphanc"
        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 = { c1e91f c1eb1f 49 4b 23cb 8b1e 23d1 }
            // n = 7, score = 100
            //   c1e91f               | shr                 ecx, 0x1f
            //   c1eb1f               | shr                 ebx, 0x1f
            //   49                   | dec                 ecx
            //   4b                   | dec                 ebx
            //   23cb                 | and                 ecx, ebx
            //   8b1e                 | mov                 ebx, dword ptr [esi]
            //   23d1                 | and                 edx, ecx

        $sequence_1 = { 8b6c243c 8d3c36 3b7d08 7f04 8bc5 eb0a 57 }
            // n = 7, score = 100
            //   8b6c243c             | mov                 ebp, dword ptr [esp + 0x3c]
            //   8d3c36               | lea                 edi, [esi + esi]
            //   3b7d08               | cmp                 edi, dword ptr [ebp + 8]
            //   7f04                 | jg                  6
            //   8bc5                 | mov                 eax, ebp
            //   eb0a                 | jmp                 0xc
            //   57                   | push                edi

        $sequence_2 = { e9???????? 8b4b14 51 e8???????? 83c404 83f85f 8b4310 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   8b4b14               | mov                 ecx, dword ptr [ebx + 0x14]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   83f85f               | cmp                 eax, 0x5f
            //   8b4310               | mov                 eax, dword ptr [ebx + 0x10]

        $sequence_3 = { 8d542420 51 8b7008 8b38 8b442478 52 50 }
            // n = 7, score = 100
            //   8d542420             | lea                 edx, [esp + 0x20]
            //   51                   | push                ecx
            //   8b7008               | mov                 esi, dword ptr [eax + 8]
            //   8b38                 | mov                 edi, dword ptr [eax]
            //   8b442478             | mov                 eax, dword ptr [esp + 0x78]
            //   52                   | push                edx
            //   50                   | push                eax

        $sequence_4 = { c3 8b4640 89442428 e8???????? 8bf8 3bfb 897c2410 }
            // n = 7, score = 100
            //   c3                   | ret                 
            //   8b4640               | mov                 eax, dword ptr [esi + 0x40]
            //   89442428             | mov                 dword ptr [esp + 0x28], eax
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax
            //   3bfb                 | cmp                 edi, ebx
            //   897c2410             | mov                 dword ptr [esp + 0x10], edi

        $sequence_5 = { 8d8424fc000000 53 50 e8???????? 6a06 50 6a01 }
            // n = 7, score = 100
            //   8d8424fc000000       | lea                 eax, [esp + 0xfc]
            //   53                   | push                ebx
            //   50                   | push                eax
            //   e8????????           |                     
            //   6a06                 | push                6
            //   50                   | push                eax
            //   6a01                 | push                1

        $sequence_6 = { 8d43ff 4d 50 51 895c241c 896c2420 e8???????? }
            // n = 7, score = 100
            //   8d43ff               | lea                 eax, [ebx - 1]
            //   4d                   | dec                 ebp
            //   50                   | push                eax
            //   51                   | push                ecx
            //   895c241c             | mov                 dword ptr [esp + 0x1c], ebx
            //   896c2420             | mov                 dword ptr [esp + 0x20], ebp
            //   e8????????           |                     

        $sequence_7 = { c7869001000001000000 c7463400100000 ff4038 eb2a 56 e8???????? 8bf8 }
            // n = 7, score = 100
            //   c7869001000001000000     | mov    dword ptr [esi + 0x190], 1
            //   c7463400100000       | mov                 dword ptr [esi + 0x34], 0x1000
            //   ff4038               | inc                 dword ptr [eax + 0x38]
            //   eb2a                 | jmp                 0x2c
            //   56                   | push                esi
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax

        $sequence_8 = { 6a00 ff9568ffffff 85c0 7524 6800003140 50 6a44 }
            // n = 7, score = 100
            //   6a00                 | push                0
            //   ff9568ffffff         | call                dword ptr [ebp - 0x98]
            //   85c0                 | test                eax, eax
            //   7524                 | jne                 0x26
            //   6800003140           | push                0x40310000
            //   50                   | push                eax
            //   6a44                 | push                0x44

        $sequence_9 = { 8b742454 85c0 7551 397424fc 740a 397424fc 7404 }
            // n = 7, score = 100
            //   8b742454             | mov                 esi, dword ptr [esp + 0x54]
            //   85c0                 | test                eax, eax
            //   7551                 | jne                 0x53
            //   397424fc             | cmp                 dword ptr [esp - 4], esi
            //   740a                 | je                  0xc
            //   397424fc             | cmp                 dword ptr [esp - 4], esi
            //   7404                 | je                  6

    condition:
        7 of them and filesize < 2015232
}