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win.gameover_dga (Back to overview)

Gameover DGA


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Yara Rules
[TLP:WHITE] win_gameover_dga_auto (20190204 | autogenerated rule brought to you by yara-signator)
rule win_gameover_dga_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2019-11-26"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator 0.1a"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.gameover_dga"
        malpedia_version = "20190204"
        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 will be published in the near future 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 = { 83f8ff 0f84140d0000 896e0c 8b6c2434 895e08 8a4c2413 e9???????? }
            // n = 7, score = 500
            //   83f8ff               | cmp                 eax, -1
            //   0f84140d0000         | je                  0xd1a
            //   896e0c               | mov                 dword ptr [esi + 0xc], ebp
            //   8b6c2434             | mov                 ebp, dword ptr [esp + 0x34]
            //   895e08               | mov                 dword ptr [esi + 8], ebx
            //   8a4c2413             | mov                 cl, byte ptr [esp + 0x13]
            //   e9????????           |                     

        $sequence_1 = { 50 8d8edc010000 8bd5 e8???????? 85c0 0f85a3000000 6a01 }
            // n = 7, score = 500
            //   50                   | push                eax
            //   8d8edc010000         | lea                 ecx, [esi + 0x1dc]
            //   8bd5                 | mov                 edx, ebp
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   0f85a3000000         | jne                 0xa9
            //   6a01                 | push                1

        $sequence_2 = { 33c0 6689044f 33c0 890e 6a0d 81f9ffffff7f 5a }
            // n = 7, score = 500
            //   33c0                 | xor                 eax, eax
            //   6689044f             | mov                 word ptr [edi + ecx*2], ax
            //   33c0                 | xor                 eax, eax
            //   890e                 | mov                 dword ptr [esi], ecx
            //   6a0d                 | push                0xd
            //   81f9ffffff7f         | cmp                 ecx, 0x7fffffff
            //   5a                   | pop                 edx

        $sequence_3 = { 2b4768 837c242462 89048a 58 0f44f0 8b84245c010000 40 }
            // n = 7, score = 500
            //   2b4768               | sub                 eax, dword ptr [edi + 0x68]
            //   837c242462           | cmp                 dword ptr [esp + 0x24], 0x62
            //   89048a               | mov                 dword ptr [edx + ecx*4], eax
            //   58                   | pop                 eax
            //   0f44f0               | cmove               esi, eax
            //   8b84245c010000       | mov                 eax, dword ptr [esp + 0x15c]
            //   40                   | inc                 eax

        $sequence_4 = { e8???????? 84c0 7405 897708 eb08 51 8bce }
            // n = 7, score = 500
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   7405                 | je                  7
            //   897708               | mov                 dword ptr [edi + 8], esi
            //   eb08                 | jmp                 0xa
            //   51                   | push                ecx
            //   8bce                 | mov                 ecx, esi

        $sequence_5 = { 6880000004 50 8d542478 33c9 e8???????? 85c0 741b }
            // n = 7, score = 500
            //   6880000004           | push                0x4000080
            //   50                   | push                eax
            //   8d542478             | lea                 edx, [esp + 0x78]
            //   33c9                 | xor                 ecx, ecx
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   741b                 | je                  0x1d

        $sequence_6 = { c3 55 8bec 81ec98080000 8d8d70f9ffff e8???????? 6a14 }
            // n = 7, score = 500
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   81ec98080000         | sub                 esp, 0x898
            //   8d8d70f9ffff         | lea                 ecx, [ebp - 0x690]
            //   e8????????           |                     
            //   6a14                 | push                0x14

        $sequence_7 = { 7620 8b542410 0fb60416 33c1 c1e908 25ff000000 }
            // n = 6, score = 500
            //   7620                 | jbe                 0x22
            //   8b542410             | mov                 edx, dword ptr [esp + 0x10]
            //   0fb60416             | movzx               eax, byte ptr [esi + edx]
            //   33c1                 | xor                 eax, ecx
            //   c1e908               | shr                 ecx, 8
            //   25ff000000           | and                 eax, 0xff

        $sequence_8 = { 40 89475c 39477c 0f8fcbf7ffff 8b44241c e9???????? 3b5f6c }
            // n = 7, score = 500
            //   40                   | inc                 eax
            //   89475c               | mov                 dword ptr [edi + 0x5c], eax
            //   39477c               | cmp                 dword ptr [edi + 0x7c], eax
            //   0f8fcbf7ffff         | jg                  0xfffff7d1
            //   8b44241c             | mov                 eax, dword ptr [esp + 0x1c]
            //   e9????????           |                     
            //   3b5f6c               | cmp                 ebx, dword ptr [edi + 0x6c]

        $sequence_9 = { 885c2410 89442418 895c241c e8???????? 84c0 742f eb1a }
            // n = 7, score = 500
            //   885c2410             | mov                 byte ptr [esp + 0x10], bl
            //   89442418             | mov                 dword ptr [esp + 0x18], eax
            //   895c241c             | mov                 dword ptr [esp + 0x1c], ebx
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   742f                 | je                  0x31
            //   eb1a                 | jmp                 0x1c

    condition:
        7 of them
}
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