rule win_new_ct_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-06-10"
        version = "1"
        description = "Detects win.new_ct."
        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.new_ct"
        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 = { 56 8bcf e8???????? 8945e4 85c0 c745fcffffffff 7428 }
            // n = 7, score = 200
            //   56                   | push                esi
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax
            //   85c0                 | test                eax, eax
            //   c745fcffffffff       | mov                 dword ptr [ebp - 4], 0xffffffff
            //   7428                 | je                  0x2a

        $sequence_1 = { 894c0304 83c308 899de0feffff 8b95d8feffff 891403 8b8ddcfeffff 894c0304 }
            // n = 7, score = 200
            //   894c0304             | mov                 dword ptr [ebx + eax + 4], ecx
            //   83c308               | add                 ebx, 8
            //   899de0feffff         | mov                 dword ptr [ebp - 0x120], ebx
            //   8b95d8feffff         | mov                 edx, dword ptr [ebp - 0x128]
            //   891403               | mov                 dword ptr [ebx + eax], edx
            //   8b8ddcfeffff         | mov                 ecx, dword ptr [ebp - 0x124]
            //   894c0304             | mov                 dword ptr [ebx + eax + 4], ecx

        $sequence_2 = { 8bc1 8bf7 8bfa eb40 bf???????? }
            // n = 5, score = 200
            //   8bc1                 | mov                 eax, ecx
            //   8bf7                 | mov                 esi, edi
            //   8bfa                 | mov                 edi, edx
            //   eb40                 | jmp                 0x42
            //   bf????????           |                     

        $sequence_3 = { 8974241c 894c2424 eb24 897c2418 897c241c 897c2420 }
            // n = 6, score = 200
            //   8974241c             | mov                 dword ptr [esp + 0x1c], esi
            //   894c2424             | mov                 dword ptr [esp + 0x24], ecx
            //   eb24                 | jmp                 0x26
            //   897c2418             | mov                 dword ptr [esp + 0x18], edi
            //   897c241c             | mov                 dword ptr [esp + 0x1c], edi
            //   897c2420             | mov                 dword ptr [esp + 0x20], edi

        $sequence_4 = { c21400 8d542434 8d442410 52 8d4c245c 50 }
            // n = 6, score = 200
            //   c21400               | ret                 0x14
            //   8d542434             | lea                 edx, dword ptr [esp + 0x34]
            //   8d442410             | lea                 eax, dword ptr [esp + 0x10]
            //   52                   | push                edx
            //   8d4c245c             | lea                 ecx, dword ptr [esp + 0x5c]
            //   50                   | push                eax

        $sequence_5 = { 52 50 8b842410280000 50 ff15???????? 83c40c }
            // n = 6, score = 200
            //   52                   | push                edx
            //   50                   | push                eax
            //   8b842410280000       | mov                 eax, dword ptr [esp + 0x2810]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83c40c               | add                 esp, 0xc

        $sequence_6 = { a1???????? 8b0d???????? 89442404 66a1???????? }
            // n = 4, score = 200
            //   a1????????           |                     
            //   8b0d????????         |                     
            //   89442404             | mov                 dword ptr [esp + 4], eax
            //   66a1????????         |                     

        $sequence_7 = { 8db5ccfdffff 8d3c03 8bd1 c1e902 f3a5 8bca 83e103 }
            // n = 7, score = 200
            //   8db5ccfdffff         | lea                 esi, dword ptr [ebp - 0x234]
            //   8d3c03               | lea                 edi, dword ptr [ebx + eax]
            //   8bd1                 | mov                 edx, ecx
            //   c1e902               | shr                 ecx, 2
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   8bca                 | mov                 ecx, edx
            //   83e103               | and                 ecx, 3

        $sequence_8 = { ff15???????? 83c404 8bf0 33db 3bf3 0f847a010000 b900900100 }
            // n = 7, score = 200
            //   ff15????????         |                     
            //   83c404               | add                 esp, 4
            //   8bf0                 | mov                 esi, eax
            //   33db                 | xor                 ebx, ebx
            //   3bf3                 | cmp                 esi, ebx
            //   0f847a010000         | je                  0x180
            //   b900900100           | mov                 ecx, 0x19000

        $sequence_9 = { 5b 81c4ac9f0100 c21400 8b8d80030000 }
            // n = 4, score = 200
            //   5b                   | pop                 ebx
            //   81c4ac9f0100         | add                 esp, 0x19fac
            //   c21400               | ret                 0x14
            //   8b8d80030000         | mov                 ecx, dword ptr [ebp + 0x380]

    condition:
        7 of them and filesize < 122880
}