rule win_gold_dragon_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-12-06"
        version = "1"
        description = "Detects win.gold_dragon."
        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.gold_dragon"
        malpedia_rule_date = "20231130"
        malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351"
        malpedia_version = "20230808"
        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???????? 8bc6 83e61f c1f805 59 8b048500954000 8d0cf6 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8bc6                 | mov                 eax, esi
            //   83e61f               | and                 esi, 0x1f
            //   c1f805               | sar                 eax, 5
            //   59                   | pop                 ecx
            //   8b048500954000       | mov                 eax, dword ptr [eax*4 + 0x409500]
            //   8d0cf6               | lea                 ecx, [esi + esi*8]

        $sequence_1 = { 85c0 a3???????? 0f848d030000 8b15???????? 68???????? }
            // n = 5, score = 100
            //   85c0                 | test                eax, eax
            //   a3????????           |                     
            //   0f848d030000         | je                  0x393
            //   8b15????????         |                     
            //   68????????           |                     

        $sequence_2 = { 0fb6fa 3bc7 7714 8b55fc 8a9200844000 }
            // n = 5, score = 100
            //   0fb6fa               | movzx               edi, dl
            //   3bc7                 | cmp                 eax, edi
            //   7714                 | ja                  0x16
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   8a9200844000         | mov                 dl, byte ptr [edx + 0x408400]

        $sequence_3 = { a3???????? 0f842d040000 8b15???????? 68???????? }
            // n = 4, score = 100
            //   a3????????           |                     
            //   0f842d040000         | je                  0x433
            //   8b15????????         |                     
            //   68????????           |                     

        $sequence_4 = { a3???????? 0f8422030000 a1???????? 68???????? 50 ffd6 }
            // n = 6, score = 100
            //   a3????????           |                     
            //   0f8422030000         | je                  0x328
            //   a1????????           |                     
            //   68????????           |                     
            //   50                   | push                eax
            //   ffd6                 | call                esi

        $sequence_5 = { 8b7d08 8d054c914000 83780800 753b b0ff }
            // n = 5, score = 100
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   8d054c914000         | lea                 eax, [0x40914c]
            //   83780800             | cmp                 dword ptr [eax + 8], 0
            //   753b                 | jne                 0x3d
            //   b0ff                 | mov                 al, 0xff

        $sequence_6 = { 8db60c844000 bf???????? a5 a5 59 }
            // n = 5, score = 100
            //   8db60c844000         | lea                 esi, [esi + 0x40840c]
            //   bf????????           |                     
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   59                   | pop                 ecx

        $sequence_7 = { ffd6 85c0 a3???????? 0f84a2050000 }
            // n = 4, score = 100
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax
            //   a3????????           |                     
            //   0f84a2050000         | je                  0x5a8

        $sequence_8 = { ffd6 85c0 a3???????? 0f84ef010000 68???????? ffd7 }
            // n = 6, score = 100
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax
            //   a3????????           |                     
            //   0f84ef010000         | je                  0x1f5
            //   68????????           |                     
            //   ffd7                 | call                edi

        $sequence_9 = { 85c0 a3???????? 0f8424020000 8b15???????? 68???????? 52 }
            // n = 6, score = 100
            //   85c0                 | test                eax, eax
            //   a3????????           |                     
            //   0f8424020000         | je                  0x22a
            //   8b15????????         |                     
            //   68????????           |                     
            //   52                   | push                edx

    condition:
        7 of them and filesize < 90112
}

import "pe"

rule win_gold_dragon_w0 {
	meta:
        author = "Florian Roth"
        description = "Detects malware from Gold Dragon report"
        reference = "https://securingtomorrow.mcafee.com/mcafee-labs/gold-dragon-widens-olympics-malware-attacks-gains-permanent-presence-on-victims-systems/"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.gold_dragon"
        malpedia_version = "20180301"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
	condition:
        pe.imphash() == "168c2f7752511dfd263a83d5d08a90db" or
        pe.imphash() == "0606858bdeb129de33a2b095d7806e74" or
        pe.imphash() == "51d992f5b9e01533eb1356323ed1cb0f" or
        pe.imphash() == "bb801224abd8562f9ee8fb261b75e32a"
}