rule win_remcos_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2019-11-26"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator 0.1a"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.remcos"
        malpedia_version = "20190204"
        malpedia_license = "CC BY-NC-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 will be published in the near future 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 = { ff7510 2b4508 6a0c 99 59 f7f9 }
            // n = 6, score = 1000
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   2b4508               | sub                 eax, dword ptr [ebp + 8]
            //   6a0c                 | push                0xc
            //   99                   | cdq                 
            //   59                   | pop                 ecx
            //   f7f9                 | idiv                ecx

        $sequence_1 = { 8d45c8 6a0f 50 ff15???????? 50 8d4de8 }
            // n = 6, score = 1000
            //   8d45c8               | lea                 eax, [ebp - 0x38]
            //   6a0f                 | push                0xf
            //   50                   | push                eax
            //   ff15????????         |                     
            //   50                   | push                eax
            //   8d4de8               | lea                 ecx, [ebp - 0x18]

        $sequence_2 = { 8bf8 ff15???????? 3bf8 729b eb2f }
            // n = 5, score = 1000
            //   8bf8                 | mov                 edi, eax
            //   ff15????????         |                     
            //   3bf8                 | cmp                 edi, eax
            //   729b                 | jb                  0xffffff9d
            //   eb2f                 | jmp                 0x31

        $sequence_3 = { 8d4ddc 50 e8???????? 8d4d0c }
            // n = 4, score = 1000
            //   8d4ddc               | lea                 ecx, [ebp - 0x24]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d4d0c               | lea                 ecx, [ebp + 0xc]

        $sequence_4 = { 03c1 f6401720 7505 6a01 58 }
            // n = 5, score = 1000
            //   03c1                 | add                 eax, ecx
            //   f6401720             | test                byte ptr [eax + 0x17], 0x20
            //   7505                 | jne                 7
            //   6a01                 | push                1
            //   58                   | pop                 eax

        $sequence_5 = { 56 8bf1 8d45ff 57 50 8d4de8 ff15???????? }
            // n = 7, score = 1000
            //   56                   | push                esi
            //   8bf1                 | mov                 esi, ecx
            //   8d45ff               | lea                 eax, [ebp - 1]
            //   57                   | push                edi
            //   50                   | push                eax
            //   8d4de8               | lea                 ecx, [ebp - 0x18]
            //   ff15????????         |                     

        $sequence_6 = { 8bcc 50 ff15???????? 83ec10 8d45c4 8bcc 50 }
            // n = 7, score = 1000
            //   8bcc                 | mov                 ecx, esp
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83ec10               | sub                 esp, 0x10
            //   8d45c4               | lea                 eax, [ebp - 0x3c]
            //   8bcc                 | mov                 ecx, esp
            //   50                   | push                eax

        $sequence_7 = { e8???????? 83c418 015e08 5f }
            // n = 4, score = 1000
            //   e8????????           |                     
            //   83c418               | add                 esp, 0x18
            //   015e08               | add                 dword ptr [esi + 8], ebx
            //   5f                   | pop                 edi

        $sequence_8 = { 803e00 0f8485000000 8d45fc 6a0a 50 56 ff15???????? }
            // n = 7, score = 1000
            //   803e00               | cmp                 byte ptr [esi], 0
            //   0f8485000000         | je                  0x8b
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   6a0a                 | push                0xa
            //   50                   | push                eax
            //   56                   | push                esi
            //   ff15????????         |                     

        $sequence_9 = { 7410 ff7510 8bce ff15???????? 83c610 }
            // n = 5, score = 1000
            //   7410                 | je                  0x12
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   8bce                 | mov                 ecx, esi
            //   ff15????????         |                     
            //   83c610               | add                 esi, 0x10

    condition:
        7 of them
}