rule win_remcos_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.remcos."
        info = "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.remcos"
        malpedia_rule_date = "20210604"
        malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd"
        malpedia_version = "20210616"
        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 = { 8d041f 50 53 e8???????? 83c418 }
            // n = 5, score = 1400
            //   8d041f               | lea                 eax, dword ptr [edi + ebx]
            //   50                   | push                eax
            //   53                   | push                ebx
            //   e8????????           |                     
            //   83c418               | add                 esp, 0x18

        $sequence_1 = { 8bd8 57 6a02 53 ff15???????? 53 8bf8 }
            // n = 7, score = 1400
            //   8bd8                 | mov                 ebx, eax
            //   57                   | push                edi
            //   6a02                 | push                2
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   53                   | push                ebx
            //   8bf8                 | mov                 edi, eax

        $sequence_2 = { 8bec 56 8bf1 ff750c ff7508 e8???????? 8bc6 }
            // n = 7, score = 1400
            //   8bec                 | mov                 ebp, esp
            //   56                   | push                esi
            //   8bf1                 | mov                 esi, ecx
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     
            //   8bc6                 | mov                 eax, esi

        $sequence_3 = { 8bc8 ff15???????? 50 ff15???????? 50 e8???????? }
            // n = 6, score = 1400
            //   8bc8                 | mov                 ecx, eax
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_4 = { 8bcf ff7508 e8???????? 83450810 4e }
            // n = 5, score = 1400
            //   8bcf                 | mov                 ecx, edi
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     
            //   83450810             | add                 dword ptr [ebp + 8], 0x10
            //   4e                   | dec                 esi

        $sequence_5 = { 83ec10 8bdc 50 8d4508 }
            // n = 4, score = 1400
            //   83ec10               | sub                 esp, 0x10
            //   8bdc                 | mov                 ebx, esp
            //   50                   | push                eax
            //   8d4508               | lea                 eax, dword ptr [ebp + 8]

        $sequence_6 = { 803e00 0f8485000000 8d45fc 6a0a 50 56 ff15???????? }
            // n = 7, score = 1400
            //   803e00               | cmp                 byte ptr [esi], 0
            //   0f8485000000         | je                  0x8b
            //   8d45fc               | lea                 eax, dword ptr [ebp - 4]
            //   6a0a                 | push                0xa
            //   50                   | push                eax
            //   56                   | push                esi
            //   ff15????????         |                     

        $sequence_7 = { 2b4508 6a0c 99 59 f7f9 8bce }
            // n = 6, score = 1400
            //   2b4508               | sub                 eax, dword ptr [ebp + 8]
            //   6a0c                 | push                0xc
            //   99                   | cdq                 
            //   59                   | pop                 ecx
            //   f7f9                 | idiv                ecx
            //   8bce                 | mov                 ecx, esi

        $sequence_8 = { 897d0c 8bce e8???????? 8bd8 6a00 035d0c }
            // n = 6, score = 1400
            //   897d0c               | mov                 dword ptr [ebp + 0xc], edi
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   8bd8                 | mov                 ebx, eax
            //   6a00                 | push                0
            //   035d0c               | add                 ebx, dword ptr [ebp + 0xc]

        $sequence_9 = { 894e08 e9???????? 8b4d08 8bd0 2bd1 c1fa04 3bd3 }
            // n = 7, score = 1400
            //   894e08               | mov                 dword ptr [esi + 8], ecx
            //   e9????????           |                     
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8bd0                 | mov                 edx, eax
            //   2bd1                 | sub                 edx, ecx
            //   c1fa04               | sar                 edx, 4
            //   3bd3                 | cmp                 edx, ebx

    condition:
        7 of them and filesize < 368640
}