rule win_farseer_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.farseer"
        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 = { 33ff 8db770484200 ff36 e8???????? 83c704 59 8906 }
            // n = 7, score = 100
            //   33ff                 | xor                 edi, edi
            //   8db770484200         | lea                 esi, [edi + 0x424870]
            //   ff36                 | push                dword ptr [esi]
            //   e8????????           |                     
            //   83c704               | add                 edi, 4
            //   59                   | pop                 ecx
            //   8906                 | mov                 dword ptr [esi], eax

        $sequence_1 = { 8b0d???????? 6a15 8d442424 50 51 ffd6 }
            // n = 6, score = 100
            //   8b0d????????         |                     
            //   6a15                 | push                0x15
            //   8d442424             | lea                 eax, [esp + 0x24]
            //   50                   | push                eax
            //   51                   | push                ecx
            //   ffd6                 | call                esi

        $sequence_2 = { 80b94045420000 74e8 8a13 0fb6ca }
            // n = 4, score = 100
            //   80b94045420000       | cmp                 byte ptr [ecx + 0x424540], 0
            //   74e8                 | je                  0xffffffea
            //   8a13                 | mov                 dl, byte ptr [ebx]
            //   0fb6ca               | movzx               ecx, dl

        $sequence_3 = { 6aff 6a00 50 8bcf c684249000000004 e8???????? c684248400000003 }
            // n = 7, score = 100
            //   6aff                 | push                -1
            //   6a00                 | push                0
            //   50                   | push                eax
            //   8bcf                 | mov                 ecx, edi
            //   c684249000000004     | mov                 byte ptr [esp + 0x90], 4
            //   e8????????           |                     
            //   c684248400000003     | mov                 byte ptr [esp + 0x84], 3

        $sequence_4 = { ff15???????? 85c0 0f95442417 39bc2480000000 }
            // n = 4, score = 100
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f95442417           | setne               byte ptr [esp + 0x17]
            //   39bc2480000000       | cmp                 dword ptr [esp + 0x80], edi

        $sequence_5 = { 83c418 6804010000 8d942418010000 52 68???????? }
            // n = 5, score = 100
            //   83c418               | add                 esp, 0x18
            //   6804010000           | push                0x104
            //   8d942418010000       | lea                 edx, [esp + 0x118]
            //   52                   | push                edx
            //   68????????           |                     

        $sequence_6 = { 64890d00000000 59 5f 5e 5d 5b 8b8c2454010000 }
            // n = 7, score = 100
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx
            //   59                   | pop                 ecx
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   5b                   | pop                 ebx
            //   8b8c2454010000       | mov                 ecx, dword ptr [esp + 0x154]

        $sequence_7 = { 52 8d742440 885904 e8???????? 8bd6 }
            // n = 5, score = 100
            //   52                   | push                edx
            //   8d742440             | lea                 esi, [esp + 0x40]
            //   885904               | mov                 byte ptr [ecx + 4], bl
            //   e8????????           |                     
            //   8bd6                 | mov                 edx, esi

        $sequence_8 = { 83c8ff 0bd0 e9???????? 8bc3 c1f805 8d048520634200 83e31f }
            // n = 7, score = 100
            //   83c8ff               | or                  eax, 0xffffffff
            //   0bd0                 | or                  edx, eax
            //   e9????????           |                     
            //   8bc3                 | mov                 eax, ebx
            //   c1f805               | sar                 eax, 5
            //   8d048520634200       | lea                 eax, [eax*4 + 0x426320]
            //   83e31f               | and                 ebx, 0x1f

        $sequence_9 = { 55 8d442418 03f2 e8???????? 8b7814 8bcf 3bcf }
            // n = 7, score = 100
            //   55                   | push                ebp
            //   8d442418             | lea                 eax, [esp + 0x18]
            //   03f2                 | add                 esi, edx
            //   e8????????           |                     
            //   8b7814               | mov                 edi, dword ptr [eax + 0x14]
            //   8bcf                 | mov                 ecx, edi
            //   3bcf                 | cmp                 ecx, edi

    condition:
        7 of them and filesize < 347328
}