SYMBOLCOMMON_NAMEaka. SYNONYMS
win.gameover_dga (Back to overview)

Gameover DGA


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Yara Rules
[TLP:WHITE] win_gameover_dga_auto (20220808 | Detects win.gameover_dga.)
rule win_gameover_dga_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        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 = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 6a14 33c9 8d90b2010000 8d45d4 50 6aff e8???????? }
            // n = 7, score = 700
            //   6a14                 | push                0x14
            //   33c9                 | xor                 ecx, ecx
            //   8d90b2010000         | lea                 edx, [eax + 0x1b2]
            //   8d45d4               | lea                 eax, [ebp - 0x2c]
            //   50                   | push                eax
            //   6aff                 | push                -1
            //   e8????????           |                     

        $sequence_1 = { 741e 3bcb 0f8391010000 8b7c242c 0fb601 41 3bc2 }
            // n = 7, score = 700
            //   741e                 | je                  0x20
            //   3bcb                 | cmp                 ecx, ebx
            //   0f8391010000         | jae                 0x197
            //   8b7c242c             | mov                 edi, dword ptr [esp + 0x2c]
            //   0fb601               | movzx               eax, byte ptr [ecx]
            //   41                   | inc                 ecx
            //   3bc2                 | cmp                 eax, edx

        $sequence_2 = { e8???????? 33db f6450001 6a02 895c2418 5f 7411 }
            // n = 7, score = 700
            //   e8????????           |                     
            //   33db                 | xor                 ebx, ebx
            //   f6450001             | test                byte ptr [ebp], 1
            //   6a02                 | push                2
            //   895c2418             | mov                 dword ptr [esp + 0x18], ebx
            //   5f                   | pop                 edi
            //   7411                 | je                  0x13

        $sequence_3 = { 7521 8b07 85c0 741b 6a04 83c004 8d4c2428 }
            // n = 7, score = 700
            //   7521                 | jne                 0x23
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   85c0                 | test                eax, eax
            //   741b                 | je                  0x1d
            //   6a04                 | push                4
            //   83c004               | add                 eax, 4
            //   8d4c2428             | lea                 ecx, [esp + 0x28]

        $sequence_4 = { 3b4c2418 0f846ce4ffff 837c241c00 0f854b0d0000 83c0fa 895c2428 83f80f }
            // n = 7, score = 700
            //   3b4c2418             | cmp                 ecx, dword ptr [esp + 0x18]
            //   0f846ce4ffff         | je                  0xffffe472
            //   837c241c00           | cmp                 dword ptr [esp + 0x1c], 0
            //   0f854b0d0000         | jne                 0xd51
            //   83c0fa               | add                 eax, -6
            //   895c2428             | mov                 dword ptr [esp + 0x28], ebx
            //   83f80f               | cmp                 eax, 0xf

        $sequence_5 = { 5f 5e 8be5 5d c20400 81ecbc000000 53 }
            // n = 7, score = 700
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c20400               | ret                 4
            //   81ecbc000000         | sub                 esp, 0xbc
            //   53                   | push                ebx

        $sequence_6 = { ff742428 ffd6 ff742424 ffd6 8d4c241c e8???????? 385c2413 }
            // n = 7, score = 700
            //   ff742428             | push                dword ptr [esp + 0x28]
            //   ffd6                 | call                esi
            //   ff742424             | push                dword ptr [esp + 0x24]
            //   ffd6                 | call                esi
            //   8d4c241c             | lea                 ecx, [esp + 0x1c]
            //   e8????????           |                     
            //   385c2413             | cmp                 byte ptr [esp + 0x13], bl

        $sequence_7 = { 40 89442428 3bc2 7edc 3bd1 }
            // n = 5, score = 700
            //   40                   | inc                 eax
            //   89442428             | mov                 dword ptr [esp + 0x28], eax
            //   3bc2                 | cmp                 eax, edx
            //   7edc                 | jle                 0xffffffde
            //   3bd1                 | cmp                 edx, ecx

        $sequence_8 = { a1???????? 68???????? ff7064 ffd6 85c0 7504 }
            // n = 6, score = 700
            //   a1????????           |                     
            //   68????????           |                     
            //   ff7064               | push                dword ptr [eax + 0x64]
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax
            //   7504                 | jne                 6

        $sequence_9 = { 8bf1 837e0c00 c706???????? 7409 ff760c ff15???????? 837e0800 }
            // n = 7, score = 700
            //   8bf1                 | mov                 esi, ecx
            //   837e0c00             | cmp                 dword ptr [esi + 0xc], 0
            //   c706????????         |                     
            //   7409                 | je                  0xb
            //   ff760c               | push                dword ptr [esi + 0xc]
            //   ff15????????         |                     
            //   837e0800             | cmp                 dword ptr [esi + 8], 0

    condition:
        7 of them and filesize < 540672
}
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