SYMBOLCOMMON_NAMEaka. SYNONYMS
win.gameover_dga (Back to overview)

Gameover DGA


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Yara Rules
[TLP:WHITE] win_gameover_dga_auto (20200529 | autogenerated rule brought to you by yara-signator)
rule win_gameover_dga_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-05-30"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.gameover_dga"
        malpedia_rule_date = "20200529"
        malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8"
        malpedia_version = "20200529"
        malpedia_license = "CC BY-NC-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 / approach 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 = { 743f 8b4c2410 55 ff7708 56 ff37 e8???????? }
            // n = 7, score = 700
            //   743f                 | je                  0x41
            //   8b4c2410             | mov                 ecx, dword ptr [esp + 0x10]
            //   55                   | push                ebp
            //   ff7708               | push                dword ptr [edi + 8]
            //   56                   | push                esi
            //   ff37                 | push                dword ptr [edi]
            //   e8????????           |                     

        $sequence_1 = { 55 56 57 6a07 33c0 8d7c244e 59 }
            // n = 7, score = 700
            //   55                   | push                ebp
            //   56                   | push                esi
            //   57                   | push                edi
            //   6a07                 | push                7
            //   33c0                 | xor                 eax, eax
            //   8d7c244e             | lea                 edi, [esp + 0x4e]
            //   59                   | pop                 ecx

        $sequence_2 = { 0f859d110000 8bc3 8944241c 3bd1 7d1c 3b5f6c }
            // n = 6, score = 700
            //   0f859d110000         | jne                 0x11a3
            //   8bc3                 | mov                 eax, ebx
            //   8944241c             | mov                 dword ptr [esp + 0x1c], eax
            //   3bd1                 | cmp                 edx, ecx
            //   7d1c                 | jge                 0x1e
            //   3b5f6c               | cmp                 ebx, dword ptr [edi + 0x6c]

        $sequence_3 = { 8d4de4 51 50 8bcf e8???????? 85c0 7442 }
            // n = 7, score = 700
            //   8d4de4               | lea                 ecx, [ebp - 0x1c]
            //   51                   | push                ecx
            //   50                   | push                eax
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7442                 | je                  0x44

        $sequence_4 = { 897218 89721c eb2b 8d442428 50 56 ff742440 }
            // n = 7, score = 700
            //   897218               | mov                 dword ptr [edx + 0x18], esi
            //   89721c               | mov                 dword ptr [edx + 0x1c], esi
            //   eb2b                 | jmp                 0x2d
            //   8d442428             | lea                 eax, [esp + 0x28]
            //   50                   | push                eax
            //   56                   | push                esi
            //   ff742440             | push                dword ptr [esp + 0x40]

        $sequence_5 = { 8bf0 89742414 83feff 0f84b8000000 8d442420 c644241300 50 }
            // n = 7, score = 700
            //   8bf0                 | mov                 esi, eax
            //   89742414             | mov                 dword ptr [esp + 0x14], esi
            //   83feff               | cmp                 esi, -1
            //   0f84b8000000         | je                  0xbe
            //   8d442420             | lea                 eax, [esp + 0x20]
            //   c644241300           | mov                 byte ptr [esp + 0x13], 0
            //   50                   | push                eax

        $sequence_6 = { 8bd9 ff15???????? 83c40c 8d4f04 56 6a32 5a }
            // n = 7, score = 700
            //   8bd9                 | mov                 ebx, ecx
            //   ff15????????         |                     
            //   83c40c               | add                 esp, 0xc
            //   8d4f04               | lea                 ecx, [edi + 4]
            //   56                   | push                esi
            //   6a32                 | push                0x32
            //   5a                   | pop                 edx

        $sequence_7 = { 57 6a19 ff75fc ff15???????? 85c0 750a ff15???????? }
            // n = 7, score = 700
            //   57                   | push                edi
            //   6a19                 | push                0x19
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   750a                 | jne                 0xc
            //   ff15????????         |                     

        $sequence_8 = { 8d4de8 51 8d4dd8 33ff 51 56 }
            // n = 6, score = 700
            //   8d4de8               | lea                 ecx, [ebp - 0x18]
            //   51                   | push                ecx
            //   8d4dd8               | lea                 ecx, [ebp - 0x28]
            //   33ff                 | xor                 edi, edi
            //   51                   | push                ecx
            //   56                   | push                esi

        $sequence_9 = { 8944241c 0fb64504 0944241c 8b44241c 0f4444243c 83c505 eb25 }
            // n = 7, score = 700
            //   8944241c             | mov                 dword ptr [esp + 0x1c], eax
            //   0fb64504             | movzx               eax, byte ptr [ebp + 4]
            //   0944241c             | or                  dword ptr [esp + 0x1c], eax
            //   8b44241c             | mov                 eax, dword ptr [esp + 0x1c]
            //   0f4444243c           | cmove               eax, dword ptr [esp + 0x3c]
            //   83c505               | add                 ebp, 5
            //   eb25                 | jmp                 0x27

    condition:
        7 of them and filesize < 540672
}
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