SYMBOLCOMMON_NAMEaka. SYNONYMS
win.gameover_dga (Back to overview)

Gameover DGA


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Yara Rules
[TLP:WHITE] win_gameover_dga_auto (20200817 | autogenerated rule brought to you by yara-signator)
rule win_gameover_dga_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-08-17"
        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 = "20200817"
        malpedia_hash = "8c895fd01eccb47a6225bcb1a3ba53cbb98644c5"
        malpedia_version = "20200817"
        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 / 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 = { ff7064 ffd6 85c0 0f8541010000 a1???????? 68???????? ff7064 }
            // n = 7, score = 700
            //   ff7064               | push                dword ptr [eax + 0x64]
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax
            //   0f8541010000         | jne                 0x147
            //   a1????????           |                     
            //   68????????           |                     
            //   ff7064               | push                dword ptr [eax + 0x64]

        $sequence_1 = { 8d4df8 e8???????? 5f 668bc3 5b 8be5 5d }
            // n = 7, score = 700
            //   8d4df8               | lea                 ecx, [ebp - 8]
            //   e8????????           |                     
            //   5f                   | pop                 edi
            //   668bc3               | mov                 ax, bx
            //   5b                   | pop                 ebx
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp

        $sequence_2 = { 8d442418 c74424182c020000 50 57 ff15???????? eb33 396c2420 }
            // n = 7, score = 700
            //   8d442418             | lea                 eax, [esp + 0x18]
            //   c74424182c020000     | mov                 dword ptr [esp + 0x18], 0x22c
            //   50                   | push                eax
            //   57                   | push                edi
            //   ff15????????         |                     
            //   eb33                 | jmp                 0x35
            //   396c2420             | cmp                 dword ptr [esp + 0x20], ebp

        $sequence_3 = { 8d442420 50 e8???????? 84c0 0f8483000000 385f08 7404 }
            // n = 7, score = 700
            //   8d442420             | lea                 eax, [esp + 0x20]
            //   50                   | push                eax
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   0f8483000000         | je                  0x89
            //   385f08               | cmp                 byte ptr [edi + 8], bl
            //   7404                 | je                  6

        $sequence_4 = { 8b84245c010000 40 89442430 50 56 ffb4245c010000 8bcb }
            // n = 7, score = 700
            //   8b84245c010000       | mov                 eax, dword ptr [esp + 0x15c]
            //   40                   | inc                 eax
            //   89442430             | mov                 dword ptr [esp + 0x30], eax
            //   50                   | push                eax
            //   56                   | push                esi
            //   ffb4245c010000       | push                dword ptr [esp + 0x15c]
            //   8bcb                 | mov                 ecx, ebx

        $sequence_5 = { e8???????? 51 89442418 8d9424ec000000 6a04 8d44241c 50 }
            // n = 7, score = 700
            //   e8????????           |                     
            //   51                   | push                ecx
            //   89442418             | mov                 dword ptr [esp + 0x18], eax
            //   8d9424ec000000       | lea                 edx, [esp + 0xec]
            //   6a04                 | push                4
            //   8d44241c             | lea                 eax, [esp + 0x1c]
            //   50                   | push                eax

        $sequence_6 = { 81f985000000 eb53 83f90a 0f8288040000 83f90d 764b 81f985000000 }
            // n = 7, score = 700
            //   81f985000000         | cmp                 ecx, 0x85
            //   eb53                 | jmp                 0x55
            //   83f90a               | cmp                 ecx, 0xa
            //   0f8288040000         | jb                  0x48e
            //   83f90d               | cmp                 ecx, 0xd
            //   764b                 | jbe                 0x4d
            //   81f985000000         | cmp                 ecx, 0x85

        $sequence_7 = { 834c2428ff 834c241cff 8b942454010000 53 55 56 8bb4245c010000 }
            // n = 7, score = 700
            //   834c2428ff           | or                  dword ptr [esp + 0x28], 0xffffffff
            //   834c241cff           | or                  dword ptr [esp + 0x1c], 0xffffffff
            //   8b942454010000       | mov                 edx, dword ptr [esp + 0x154]
            //   53                   | push                ebx
            //   55                   | push                ebp
            //   56                   | push                esi
            //   8bb4245c010000       | mov                 esi, dword ptr [esp + 0x15c]

        $sequence_8 = { 0f94c0 c1e108 89442428 0fb64502 0bc8 0fb64503 c1e008 }
            // n = 7, score = 700
            //   0f94c0               | sete                al
            //   c1e108               | shl                 ecx, 8
            //   89442428             | mov                 dword ptr [esp + 0x28], eax
            //   0fb64502             | movzx               eax, byte ptr [ebp + 2]
            //   0bc8                 | or                  ecx, eax
            //   0fb64503             | movzx               eax, byte ptr [ebp + 3]
            //   c1e008               | shl                 eax, 8

        $sequence_9 = { 50 57 56 897c2420 ff15???????? 8b4c2414 894c2440 }
            // n = 7, score = 700
            //   50                   | push                eax
            //   57                   | push                edi
            //   56                   | push                esi
            //   897c2420             | mov                 dword ptr [esp + 0x20], edi
            //   ff15????????         |                     
            //   8b4c2414             | mov                 ecx, dword ptr [esp + 0x14]
            //   894c2440             | mov                 dword ptr [esp + 0x40], ecx

    condition:
        7 of them and filesize < 540672
}
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