rule win_nymaim2_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.nymaim2."
        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.nymaim2"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 8b7de8 ff4514 6a04 890a 59 014dfc }
            // n = 6, score = 200
            //   8b7de8               | mov                 edi, dword ptr [ebp - 0x18]
            //   ff4514               | inc                 dword ptr [ebp + 0x14]
            //   6a04                 | push                4
            //   890a                 | mov                 dword ptr [edx], ecx
            //   59                   | pop                 ecx
            //   014dfc               | add                 dword ptr [ebp - 4], ecx

        $sequence_1 = { c645fc0c e8???????? b8???????? c3 6a51 8d4ddc e8???????? }
            // n = 7, score = 200
            //   c645fc0c             | mov                 byte ptr [ebp - 4], 0xc
            //   e8????????           |                     
            //   b8????????           |                     
            //   c3                   | ret                 
            //   6a51                 | push                0x51
            //   8d4ddc               | lea                 ecx, [ebp - 0x24]
            //   e8????????           |                     

        $sequence_2 = { c9 c20800 56 8bf1 8b4604 c706???????? 85c0 }
            // n = 7, score = 200
            //   c9                   | leave               
            //   c20800               | ret                 8
            //   56                   | push                esi
            //   8bf1                 | mov                 esi, ecx
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   c706????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_3 = { 80fa30 7c05 80fa39 7ee8 5e c3 }
            // n = 6, score = 200
            //   80fa30               | cmp                 dl, 0x30
            //   7c05                 | jl                  7
            //   80fa39               | cmp                 dl, 0x39
            //   7ee8                 | jle                 0xffffffea
            //   5e                   | pop                 esi
            //   c3                   | ret                 

        $sequence_4 = { ff7650 8945fc ff750c 50 e8???????? 8b86a0000000 8b7df8 }
            // n = 7, score = 200
            //   ff7650               | push                dword ptr [esi + 0x50]
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b86a0000000         | mov                 eax, dword ptr [esi + 0xa0]
            //   8b7df8               | mov                 edi, dword ptr [ebp - 8]

        $sequence_5 = { 53 56 8bf1 57 68fd030000 8d4dc0 e8???????? }
            // n = 7, score = 200
            //   53                   | push                ebx
            //   56                   | push                esi
            //   8bf1                 | mov                 esi, ecx
            //   57                   | push                edi
            //   68fd030000           | push                0x3fd
            //   8d4dc0               | lea                 ecx, [ebp - 0x40]
            //   e8????????           |                     

        $sequence_6 = { 897df0 397df0 8d4d08 0f95c3 834dfcff e8???????? 8b4df4 }
            // n = 7, score = 200
            //   897df0               | mov                 dword ptr [ebp - 0x10], edi
            //   397df0               | cmp                 dword ptr [ebp - 0x10], edi
            //   8d4d08               | lea                 ecx, [ebp + 8]
            //   0f95c3               | setne               bl
            //   834dfcff             | or                  dword ptr [ebp - 4], 0xffffffff
            //   e8????????           |                     
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]

        $sequence_7 = { a5 a5 50 a5 e8???????? 8d75e0 8d7dc0 }
            // n = 7, score = 200
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   50                   | push                eax
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   e8????????           |                     
            //   8d75e0               | lea                 esi, [ebp - 0x20]
            //   8d7dc0               | lea                 edi, [ebp - 0x40]

        $sequence_8 = { ff15???????? 6a19 99 59 f7f9 8bc2 83c061 }
            // n = 7, score = 200
            //   ff15????????         |                     
            //   6a19                 | push                0x19
            //   99                   | cdq                 
            //   59                   | pop                 ecx
            //   f7f9                 | idiv                ecx
            //   8bc2                 | mov                 eax, edx
            //   83c061               | add                 eax, 0x61

        $sequence_9 = { e8???????? 85c0 59 7535 33ff 3975e8 7e2e }
            // n = 7, score = 200
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   59                   | pop                 ecx
            //   7535                 | jne                 0x37
            //   33ff                 | xor                 edi, edi
            //   3975e8               | cmp                 dword ptr [ebp - 0x18], esi
            //   7e2e                 | jle                 0x30

    condition:
        7 of them and filesize < 753664
}