rule win_nighthawk_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.nighthawk."
        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.nighthawk"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 48c7402000000000 488b442428 488b00 4889442438 488b4c2428 e8???????? 488b442438 }
            // n = 7, score = 100
            //   48c7402000000000     | cmp                 dword ptr [edi + 8], 0
            //   488b442428           | je                  0xc8e
            //   488b00               | dec                 eax
            //   4889442438           | cmp                 dword ptr [edi], 0
            //   488b4c2428           | je                  0x1564
            //   e8????????           |                     
            //   488b442438           | jne                 0xe92

        $sequence_1 = { ff15???????? 85c0 0f8508ffffff 498b5508 493b5510 740f 0f1045b0 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   85c0                 | mov                 esi, eax
            //   0f8508ffffff         | dec                 eax
            //   498b5508             | lea                 edx, [esp + 0x30]
            //   493b5510             | dec                 eax
            //   740f                 | lea                 ecx, [ebp - 0x70]
            //   0f1045b0             | dec                 eax

        $sequence_2 = { e8???????? 488d9520040000 488d8d00050000 e8???????? 90 48395818 7203 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   488d9520040000       | mov                 ebx, dword ptr [esi]
            //   488d8d00050000       | dec                 eax
            //   e8????????           |                     
            //   90                   | mov                 edx, ecx
            //   48395818             | nop                 
            //   7203                 | dec                 eax

        $sequence_3 = { f30f7f842490000000 4889b424a0000000 4c89ac2480000000 4d397518 720c 498b4500 4889842480000000 }
            // n = 7, score = 100
            //   f30f7f842490000000     | lea    ecx, [ebp + 0x68]
            //   4889b424a0000000     | nop                 
            //   4c89ac2480000000     | dec                 eax
            //   4d397518             | mov                 edx, eax
            //   720c                 | dec                 eax
            //   498b4500             | lea                 ecx, [edi + 0x10]
            //   4889842480000000     | dec                 eax

        $sequence_4 = { 48c744242001000000 4c8d0d48270800 488d4df7 e8???????? 90 4c8d053f270800 488d55f7 }
            // n = 7, score = 100
            //   48c744242001000000     | arpl    word ptr [edi + 8], dx
            //   4c8d0d48270800       | dec                 eax
            //   488d4df7             | add                 edx, dword ptr [ebp + 8]
            //   e8????????           |                     
            //   90                   | movzx               ecx, byte ptr [edx]
            //   4c8d053f270800       | and                 ecx, 0xf
            //   488d55f7             | dec                 edx

        $sequence_5 = { eb1b 488bd8 488b08 44386119 750f 488bd9 488b01 }
            // n = 7, score = 100
            //   eb1b                 | dec                 eax
            //   488bd8               | mov                 ebx, dword ptr [esp + 0x50]
            //   488b08               | dec                 esp
            //   44386119             | cmp                 dword ptr [esp + 0x68], edi
            //   750f                 | dec                 eax
            //   488bd9               | cmovae              ecx, ebx
            //   488b01               | dec                 esp

        $sequence_6 = { 480fafc1 488d1480 48c1e206 4881fa00100000 7218 488b4bf8 4883c227 }
            // n = 7, score = 100
            //   480fafc1             | and                 ecx, 0xfffffffc
            //   488d1480             | dec                 eax
            //   48c1e206             | cmp                 eax, ecx
            //   4881fa00100000       | jge                 0x20d
            //   7218                 | dec                 eax
            //   488b4bf8             | mov                 edx, dword ptr [esp + 0x20]
            //   4883c227             | dec                 esp

        $sequence_7 = { e8???????? 90 48897550 48897560 48895d68 458bc6 498bd7 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   90                   | mov                 dword ptr [ebp + 0x4a8], edi
            //   48897550             | dec                 eax
            //   48897560             | lea                 ecx, [0x82900]
            //   48895d68             | dec                 eax
            //   458bc6               | mov                 dword ptr [ebp - 0x50], eax
            //   498bd7               | dec                 eax

        $sequence_8 = { 6689bb88000000 4883bb8000000008 720e 488b4b68 4885c9 7405 e8???????? }
            // n = 7, score = 100
            //   6689bb88000000       | dec                 eax
            //   4883bb8000000008     | cmp                 dword ptr [ebp + 0x68], 8
            //   720e                 | jb                  0x1152
            //   488b4b68             | dec                 eax
            //   4885c9               | mov                 ecx, dword ptr [ebp + 0x50]
            //   7405                 | dec                 eax
            //   e8????????           |                     

        $sequence_9 = { e8???????? 4588241e 41c6441e0100 4d85ff 7453 e8???????? 498bd7 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   4588241e             | dec                 eax
            //   41c6441e0100         | mov                 dword ptr [ebp - 0x68], 0xf
            //   4d85ff               | inc                 ebp
            //   7453                 | lea                 eax, [edi + 0x11]
            //   e8????????           |                     
            //   498bd7               | dec                 eax

    condition:
        7 of them and filesize < 1949696
}