SYMBOLCOMMON_NAMEaka. SYNONYMS
win.gameover_dga (Back to overview)

Gameover DGA


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Yara Rules
[TLP:WHITE] win_gameover_dga_auto (20221125 | Detects win.gameover_dga.)
rule win_gameover_dga_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        version = "1"
        description = "Detects win.gameover_dga."
        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.gameover_dga"
        malpedia_rule_date = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { 0f87a5000000 8b5d0c 83e301 750f e8???????? 8bf0 85f6 }
            // n = 7, score = 700
            //   0f87a5000000         | ja                  0xab
            //   8b5d0c               | mov                 ebx, dword ptr [ebp + 0xc]
            //   83e301               | and                 ebx, 1
            //   750f                 | jne                 0x11
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi

        $sequence_1 = { 0f42e8 8d44243c 6a14 50 6aff 33c9 }
            // n = 6, score = 700
            //   0f42e8               | cmovb               ebp, eax
            //   8d44243c             | lea                 eax, [esp + 0x3c]
            //   6a14                 | push                0x14
            //   50                   | push                eax
            //   6aff                 | push                -1
            //   33c9                 | xor                 ecx, ecx

        $sequence_2 = { 395f50 7450 3b7750 754b 8b442424 f7d8 c644241c01 }
            // n = 7, score = 700
            //   395f50               | cmp                 dword ptr [edi + 0x50], ebx
            //   7450                 | je                  0x52
            //   3b7750               | cmp                 esi, dword ptr [edi + 0x50]
            //   754b                 | jne                 0x4d
            //   8b442424             | mov                 eax, dword ptr [esp + 0x24]
            //   f7d8                 | neg                 eax
            //   c644241c01           | mov                 byte ptr [esp + 0x1c], 1

        $sequence_3 = { 57 8bf2 8bf9 8b4d08 8d55c4 e8???????? 56 }
            // n = 7, score = 700
            //   57                   | push                edi
            //   8bf2                 | mov                 esi, edx
            //   8bf9                 | mov                 edi, ecx
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8d55c4               | lea                 edx, [ebp - 0x3c]
            //   e8????????           |                     
            //   56                   | push                esi

        $sequence_4 = { 50 ff742450 ff770c ff15???????? 0fb64d01 83c40c 0fb64502 }
            // n = 7, score = 700
            //   50                   | push                eax
            //   ff742450             | push                dword ptr [esp + 0x50]
            //   ff770c               | push                dword ptr [edi + 0xc]
            //   ff15????????         |                     
            //   0fb64d01             | movzx               ecx, byte ptr [ebp + 1]
            //   83c40c               | add                 esp, 0xc
            //   0fb64502             | movzx               eax, byte ptr [ebp + 2]

        $sequence_5 = { ff742440 8bf8 ff15???????? ff742420 55 ff15???????? }
            // n = 6, score = 700
            //   ff742440             | push                dword ptr [esp + 0x40]
            //   8bf8                 | mov                 edi, eax
            //   ff15????????         |                     
            //   ff742420             | push                dword ptr [esp + 0x20]
            //   55                   | push                ebp
            //   ff15????????         |                     

        $sequence_6 = { 8b74242c 57 837b1400 8b3d???????? 7e36 f6461004 }
            // n = 6, score = 700
            //   8b74242c             | mov                 esi, dword ptr [esp + 0x2c]
            //   57                   | push                edi
            //   837b1400             | cmp                 dword ptr [ebx + 0x14], 0
            //   8b3d????????         |                     
            //   7e36                 | jle                 0x38
            //   f6461004             | test                byte ptr [esi + 0x10], 4

        $sequence_7 = { 8b74242c 1bd5 8b6c2434 48 03f8 8bc1 0bc2 }
            // n = 7, score = 700
            //   8b74242c             | mov                 esi, dword ptr [esp + 0x2c]
            //   1bd5                 | sbb                 edx, ebp
            //   8b6c2434             | mov                 ebp, dword ptr [esp + 0x34]
            //   48                   | dec                 eax
            //   03f8                 | add                 edi, eax
            //   8bc1                 | mov                 eax, ecx
            //   0bc2                 | or                  eax, edx

        $sequence_8 = { 8d4676 50 e8???????? 84c0 7520 8b4c242c e8???????? }
            // n = 7, score = 700
            //   8d4676               | lea                 eax, [esi + 0x76]
            //   50                   | push                eax
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   7520                 | jne                 0x22
            //   8b4c242c             | mov                 ecx, dword ptr [esp + 0x2c]
            //   e8????????           |                     

        $sequence_9 = { 0fb60b 8b4730 0fb60401 39442414 7408 43 42 }
            // n = 7, score = 700
            //   0fb60b               | movzx               ecx, byte ptr [ebx]
            //   8b4730               | mov                 eax, dword ptr [edi + 0x30]
            //   0fb60401             | movzx               eax, byte ptr [ecx + eax]
            //   39442414             | cmp                 dword ptr [esp + 0x14], eax
            //   7408                 | je                  0xa
            //   43                   | inc                 ebx
            //   42                   | inc                 edx

    condition:
        7 of them and filesize < 540672
}
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