rule win_zeroaccess_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-05-30"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.zeroaccess"
        malpedia_rule_date = "20200529"
        malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8"
        malpedia_version = "20200529"
        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 / approach 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 = { 85c0 7408 ff15???????? eb02 }
            // n = 4, score = 300
            //   85c0                 | test                eax, eax
            //   7408                 | je                  0xa
            //   ff15????????         |                     
            //   eb02                 | jmp                 4

        $sequence_1 = { 56 68???????? 50 8d460c 50 ff15???????? }
            // n = 6, score = 200
            //   56                   | push                esi
            //   68????????           |                     
            //   50                   | push                eax
            //   8d460c               | lea                 eax, [esi + 0xc]
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_2 = { 740c bf03000040 eb05 bf010000c0 85ff }
            // n = 5, score = 200
            //   740c                 | je                  0xe
            //   bf03000040           | mov                 edi, 0x40000003
            //   eb05                 | jmp                 7
            //   bf010000c0           | mov                 edi, 0xc0000001
            //   85ff                 | test                edi, edi

        $sequence_3 = { ff15???????? 3d05000080 7404 85c0 }
            // n = 4, score = 200
            //   ff15????????         |                     
            //   3d05000080           | cmp                 eax, 0x80000005
            //   7404                 | je                  6
            //   85c0                 | test                eax, eax

        $sequence_4 = { 6a10 68???????? 68060000c8 ff7708 ff15???????? 85c0 }
            // n = 6, score = 200
            //   6a10                 | push                0x10
            //   68????????           |                     
            //   68060000c8           | push                0xc8000006
            //   ff7708               | push                dword ptr [edi + 8]
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_5 = { 57 6a02 68???????? ff75f8 }
            // n = 4, score = 200
            //   57                   | push                edi
            //   6a02                 | push                2
            //   68????????           |                     
            //   ff75f8               | push                dword ptr [ebp - 8]

        $sequence_6 = { 8d45f4 50 ff7608 ff15???????? 85c0 7408 }
            // n = 6, score = 200
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   50                   | push                eax
            //   ff7608               | push                dword ptr [esi + 8]
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7408                 | je                  0xa

        $sequence_7 = { 50 6a01 8d45f4 50 ff7308 }
            // n = 5, score = 200
            //   50                   | push                eax
            //   6a01                 | push                1
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   50                   | push                eax
            //   ff7308               | push                dword ptr [ebx + 8]

        $sequence_8 = { 33c0 48 83c9ff c744242804000000 48 }
            // n = 5, score = 200
            //   33c0                 | xor                 eax, eax
            //   48                   | dec                 eax
            //   83c9ff               | or                  ecx, 0xffffffff
            //   c744242804000000     | mov                 dword ptr [esp + 0x28], 4
            //   48                   | dec                 eax

        $sequence_9 = { ff15???????? 85c0 7407 b8e3030000 }
            // n = 4, score = 200
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7407                 | je                  9
            //   b8e3030000           | mov                 eax, 0x3e3

        $sequence_10 = { 8d45fc 50 57 56 6a02 }
            // n = 5, score = 200
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   50                   | push                eax
            //   57                   | push                edi
            //   56                   | push                esi
            //   6a02                 | push                2

        $sequence_11 = { 41 8bc0 f00fb115???????? 44 }
            // n = 4, score = 100
            //   41                   | inc                 ecx
            //   8bc0                 | mov                 eax, eax
            //   f00fb115????????     |                     
            //   44                   | inc                 esp

        $sequence_12 = { 8b07 85c0 0f85b8feffff 48 8b4d28 88442450 }
            // n = 6, score = 100
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   85c0                 | test                eax, eax
            //   0f85b8feffff         | jne                 0xfffffebe
            //   48                   | dec                 eax
            //   8b4d28               | mov                 ecx, dword ptr [ebp + 0x28]
            //   88442450             | mov                 byte ptr [esp + 0x50], al

        $sequence_13 = { 8d7f04 ffc9 75f4 8b15???????? 85d2 7e24 }
            // n = 6, score = 100
            //   8d7f04               | lea                 edi, [edi + 4]
            //   ffc9                 | dec                 ecx
            //   75f4                 | jne                 0xfffffff6
            //   8b15????????         |                     
            //   85d2                 | test                edx, edx
            //   7e24                 | jle                 0x26

        $sequence_14 = { 8d0dec5c0000 ff15???????? 48 8b4d77 }
            // n = 4, score = 100
            //   8d0dec5c0000         | lea                 ecx, [0x5cec]
            //   ff15????????         |                     
            //   48                   | dec                 eax
            //   8b4d77               | mov                 ecx, dword ptr [ebp + 0x77]

    condition:
        7 of them and filesize < 172032
}