rule win_nimbo_c2_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        version = "1"
        description = "Detects win.nimbo_c2."
        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.nimbo_c2"
        malpedia_rule_date = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { e8???????? ebe4 8b4608 a880 7405 c6032d eb12 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   ebe4                 | dec                 eax
            //   8b4608               | lea                 edx, [0x32bf4]
            //   a880                 | dec                 esp
            //   7405                 | lea                 ecx, [0x32a50]
            //   c6032d               | dec                 esp
            //   eb12                 | lea                 edx, [0x58bac]

        $sequence_1 = { ebeb 4183fa6f 759d ebb0 4801c3 e9???????? 4889ec }
            // n = 7, score = 300
            //   ebeb                 | dec                 eax
            //   4183fa6f             | mov                 ecx, dword ptr [ebp - 0x3b8]
            //   759d                 | dec                 eax
            //   ebb0                 | mov                 ecx, dword ptr [ebp + 0x18]
            //   4801c3               | dec                 eax
            //   e9????????           |                     
            //   4889ec               | mov                 eax, dword ptr [eax]

        $sequence_2 = { 498b4c2418 ba11000000 e8???????? 4c89f1 4889c2 e8???????? 498b4c2418 }
            // n = 7, score = 300
            //   498b4c2418           | mov                 edx, 1
            //   ba11000000           | dec                 esp
            //   e8????????           |                     
            //   4c89f1               | mov                 ecx, ecx
            //   4889c2               | dec                 eax
            //   e8????????           |                     
            //   498b4c2418           | lea                 edx, [0x2e090]

        $sequence_3 = { ebc1 4c39ca 7d0d 418a4c1010 880c10 48ffc2 ebee }
            // n = 7, score = 300
            //   ebc1                 | dec                 eax
            //   4c39ca               | mov                 ecx, dword ptr [ebx + 0x78]
            //   7d0d                 | dec                 esp
            //   418a4c1010           | mov                 edx, esp
            //   880c10               | dec                 eax
            //   48ffc2               | mov                 ecx, dword ptr [ebx + 0x88]
            //   ebee                 | dec                 eax

        $sequence_4 = { eb3d 4c89ea 4883e837 48c1e204 4809d0 4989c5 eb2a }
            // n = 7, score = 300
            //   eb3d                 | dec                 eax
            //   4c89ea               | mov                 edx, dword ptr [esp + 0xa0]
            //   4883e837             | dec                 esp
            //   48c1e204             | mov                 ecx, esp
            //   4809d0               | dec                 eax
            //   4989c5               | mov                 eax, dword ptr [edi + 8]
            //   eb2a                 | dec                 eax

        $sequence_5 = { 4531c0 4885db 7403 4c8b03 4889442420 488d5310 4c89e1 }
            // n = 7, score = 300
            //   4531c0               | pop                 es
            //   4885db               | adc                 byte ptr [eax - 0x7b], cl
            //   7403                 | sal                 byte ptr [ebp + 5], 0x49
            //   4c8b03               | and                 ebp, ebx
            //   4889442420           | dec                 ebp
            //   488d5310             | mov                 esp, ebp
            //   4c89e1               | jmp                 0xffffffd1

        $sequence_6 = { ff15???????? 4531c9 31d2 b900130000 89c3 488d442448 4531ed }
            // n = 7, score = 300
            //   ff15????????         |                     
            //   4531c9               | sub                 dword ptr [esp + 0xbc], ebp
            //   31d2                 | dec                 eax
            //   b900130000           | mov                 dword ptr [esp + 0xc8], eax
            //   89c3                 | mov                 eax, dword ptr [esp + 0x50]
            //   488d442448           | dec                 eax
            //   4531ed               | mov                 ecx, dword ptr [esp + 0xc8]

        $sequence_7 = { 4c89e2 4c89c9 e8???????? 4c89ea eb24 31c0 4d85e4 }
            // n = 7, score = 300
            //   4c89e2               | inc                 esi
            //   4c89c9               | inc                 ecx
            //   e8????????           |                     
            //   4c89ea               | mov                 edi, eax
            //   eb24                 | inc                 ecx
            //   31c0                 | movzx               edx, bh
            //   4d85e4               | dec                 eax

        $sequence_8 = { 48ffc2 4c8d0412 488d0c40 4939c8 7c09 4829c2 4883fa03 }
            // n = 7, score = 300
            //   48ffc2               | add                 esp, 0x28
            //   4c8d0412             | dec                 eax
            //   488d0c40             | mov                 eax, dword ptr [ecx - 0x10]
            //   4939c8               | dec                 eax
            //   7c09                 | lea                 edx, [0x31c57]
            //   4829c2               | jmp                 0x19d
            //   4883fa03             | mov                 edx, 2

        $sequence_9 = { e8???????? ebe3 e8???????? 4889c1 e8???????? 488b8d58fbffff 4885c9 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   ebe3                 | lea                 eax, [0x2aca0]
            //   e8????????           |                     
            //   4889c1               | dec                 eax
            //   e8????????           |                     
            //   488b8d58fbffff       | lea                 eax, [0x525d6]
            //   4885c9               | dec                 eax

    condition:
        7 of them and filesize < 1076224
}