rule win_ddkeylogger_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.ddkeylogger"
        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 = { f7c200080000 0f95c0 040b c3 f7c200020000 0f95c0 0409 }
            // n = 7, score = 200
            //   f7c200080000         | test                edx, 0x800
            //   0f95c0               | setne               al
            //   040b                 | add                 al, 0xb
            //   c3                   | ret                 
            //   f7c200020000         | test                edx, 0x200
            //   0f95c0               | setne               al
            //   0409                 | add                 al, 9

        $sequence_1 = { a1???????? a3???????? a1???????? c705????????3b5b4000 8935???????? a3???????? ff15???????? }
            // n = 7, score = 200
            //   a1????????           |                     
            //   a3????????           |                     
            //   a1????????           |                     
            //   c705????????3b5b4000     |     
            //   8935????????         |                     
            //   a3????????           |                     
            //   ff15????????         |                     

        $sequence_2 = { 5f 5e 894204 890a b801000000 5b 8be5 }
            // n = 7, score = 200
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   894204               | mov                 dword ptr [edx + 4], eax
            //   890a                 | mov                 dword ptr [edx], ecx
            //   b801000000           | mov                 eax, 1
            //   5b                   | pop                 ebx
            //   8be5                 | mov                 esp, ebp

        $sequence_3 = { 8b9534efffff a0???????? 8b8d30efffff 88441102 8b9534efffff 03df }
            // n = 6, score = 200
            //   8b9534efffff         | mov                 edx, dword ptr [ebp - 0x10cc]
            //   a0????????           |                     
            //   8b8d30efffff         | mov                 ecx, dword ptr [ebp - 0x10d0]
            //   88441102             | mov                 byte ptr [ecx + edx + 2], al
            //   8b9534efffff         | mov                 edx, dword ptr [ebp - 0x10cc]
            //   03df                 | add                 ebx, edi

        $sequence_4 = { 6a01 50 e8???????? 83c410 4f 79e6 56 }
            // n = 7, score = 200
            //   6a01                 | push                1
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   4f                   | dec                 edi
            //   79e6                 | jns                 0xffffffe8
            //   56                   | push                esi

        $sequence_5 = { f7d2 33c0 235508 8da42400000000 }
            // n = 4, score = 200
            //   f7d2                 | not                 edx
            //   33c0                 | xor                 eax, eax
            //   235508               | and                 edx, dword ptr [ebp + 8]
            //   8da42400000000       | lea                 esp, [esp]

        $sequence_6 = { 3bc2 7325 8b4ddc 8b55e4 50 8b450c 03c3 }
            // n = 7, score = 200
            //   3bc2                 | cmp                 eax, edx
            //   7325                 | jae                 0x27
            //   8b4ddc               | mov                 ecx, dword ptr [ebp - 0x24]
            //   8b55e4               | mov                 edx, dword ptr [ebp - 0x1c]
            //   50                   | push                eax
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   03c3                 | add                 eax, ebx

        $sequence_7 = { 83c8fe 40 83f801 8bc7 7508 8a4c0bff }
            // n = 6, score = 200
            //   83c8fe               | or                  eax, 0xfffffffe
            //   40                   | inc                 eax
            //   83f801               | cmp                 eax, 1
            //   8bc7                 | mov                 eax, edi
            //   7508                 | jne                 0xa
            //   8a4c0bff             | mov                 cl, byte ptr [ebx + ecx - 1]

        $sequence_8 = { 8bc7 2bc1 0fb65901 881c08 0fb619 }
            // n = 5, score = 200
            //   8bc7                 | mov                 eax, edi
            //   2bc1                 | sub                 eax, ecx
            //   0fb65901             | movzx               ebx, byte ptr [ecx + 1]
            //   881c08               | mov                 byte ptr [eax + ecx], bl
            //   0fb619               | movzx               ebx, byte ptr [ecx]

        $sequence_9 = { 6685c1 0f8469010000 e8???????? 85c0 0f84bc000000 }
            // n = 5, score = 200
            //   6685c1               | test                cx, ax
            //   0f8469010000         | je                  0x16f
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   0f84bc000000         | je                  0xc2

    condition:
        7 of them and filesize < 808960
}