rule win_karius_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        version = "1"
        description = "Detects win.karius."
        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.karius"
        malpedia_rule_date = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { bf01000000 8bd7 498bce ffd3 4183bf8c00000000 0f84b3000000 }
            // n = 6, score = 400
            //   bf01000000           | je                  0x7d
            //   8bd7                 | mov                 esi, dword ptr [esp + 0xb0]
            //   498bce               | inc                 ecx
            //   ffd3                 | mov                 edx, dword ptr [eax]
            //   4183bf8c00000000     | mov                 edi, 1
            //   0f84b3000000         | mov                 edx, edi

        $sequence_1 = { 85db 0f849d000000 41837b1400 0f8492000000 458b4320 }
            // n = 5, score = 400
            //   85db                 | inc                 ecx
            //   0f849d000000         | mov                 ebx, dword ptr [ebx + 0x18]
            //   41837b1400           | test                ebx, ebx
            //   0f8492000000         | je                  0x98
            //   458b4320             | inc                 ebp

        $sequence_2 = { 4d03c6 4d03d6 448bcd 85db 0f8477000000 8bb424b0000000 418b10 }
            // n = 7, score = 400
            //   4d03c6               | dec                 ebp
            //   4d03d6               | add                 eax, esi
            //   448bcd               | dec                 ebp
            //   85db                 | add                 edx, esi
            //   0f8477000000         | inc                 esp
            //   8bb424b0000000       | mov                 ecx, ebp
            //   418b10               | test                ebx, ebx

        $sequence_3 = { c3 85c0 7505 e8???????? b801000000 }
            // n = 5, score = 400
            //   c3                   | mov                 ecx, ebp
            //   85c0                 | dec                 ebp
            //   7505                 | add                 edx, esi
            //   e8????????           |                     
            //   b801000000           | inc                 esp

        $sequence_4 = { 488b05???????? 4885c0 7512 ff15???????? 488905???????? }
            // n = 5, score = 400
            //   488b05????????       |                     
            //   4885c0               | add                 edx, esi
            //   7512                 | movzx               eax, byte ptr [edx]
            //   ff15????????         |                     
            //   488905????????       |                     

        $sequence_5 = { 8bb424b0000000 418b10 8bcd 4903d6 0fb602 0f1f440000 }
            // n = 6, score = 400
            //   8bb424b0000000       | mov                 eax, dword ptr [ebx + 0x20]
            //   418b10               | mov                 edx, edi
            //   8bcd                 | dec                 ecx
            //   4903d6               | mov                 ecx, esi
            //   0fb602               | call                ebx
            //   0f1f440000           | inc                 ecx

        $sequence_6 = { 41b830000000 488bcf ff15???????? 4885c0 }
            // n = 4, score = 400
            //   41b830000000         | dec                 ebp
            //   488bcf               | add                 eax, esi
            //   ff15????????         |                     
            //   4885c0               | inc                 ecx

        $sequence_7 = { ffd3 4183bf8c00000000 0f84b3000000 458b9f88000000 4d03de 418b5b18 85db }
            // n = 7, score = 400
            //   ffd3                 | dec                 ecx
            //   4183bf8c00000000     | mov                 ecx, esi
            //   0f84b3000000         | call                ebx
            //   458b9f88000000       | inc                 ecx
            //   4d03de               | cmp                 dword ptr [edi + 0x8c], 0
            //   418b5b18             | je                  0xc3
            //   85db                 | call                ebx

        $sequence_8 = { 0f8492000000 458b4320 458b5324 33ed 4d03c6 4d03d6 448bcd }
            // n = 7, score = 400
            //   0f8492000000         | inc                 ecx
            //   458b4320             | cmp                 dword ptr [edi + 0x8c], 0
            //   458b5324             | je                  0xc3
            //   33ed                 | inc                 ebp
            //   4d03c6               | mov                 ebx, dword ptr [edi + 0x88]
            //   4d03d6               | dec                 ebp
            //   448bcd               | add                 ebx, esi

        $sequence_9 = { ff15???????? 488bf8 4885c0 7505 8d4701 }
            // n = 5, score = 300
            //   ff15????????         |                     
            //   488bf8               | je                  0x98
            //   4885c0               | inc                 ebp
            //   7505                 | mov                 eax, dword ptr [ebx + 0x20]
            //   8d4701               | inc                 ebp

        $sequence_10 = { 8a0c17 8d5201 884aff 4e }
            // n = 4, score = 300
            //   8a0c17               | dec                 eax
            //   8d5201               | test                eax, eax
            //   884aff               | inc                 esp
            //   4e                   | mov                 ecx, ebp

        $sequence_11 = { 448bc0 33d2 488bce ff15???????? 4c8bf0 4885c0 }
            // n = 6, score = 300
            //   448bc0               | mov                 eax, dword ptr [ebx + 0x20]
            //   33d2                 | inc                 ecx
            //   488bce               | mov                 ebx, dword ptr [ebx + 0x18]
            //   ff15????????         |                     
            //   4c8bf0               | test                ebx, ebx
            //   4885c0               | je                  0xa5

        $sequence_12 = { 8d7b01 448bfb 448be3 4885c9 }
            // n = 4, score = 300
            //   8d7b01               | mov                 edx, dword ptr [ebx + 0x24]
            //   448bfb               | xor                 ebp, ebp
            //   448be3               | dec                 ebp
            //   4885c9               | add                 eax, esi

        $sequence_13 = { ff15???????? 4c8be8 498bce ff15???????? 4d85ed }
            // n = 5, score = 300
            //   ff15????????         |                     
            //   4c8be8               | je                  0xc8
            //   498bce               | inc                 ebp
            //   ff15????????         |                     
            //   4d85ed               | mov                 ebx, dword ptr [edi + 0x88]

        $sequence_14 = { 5e 8bc3 5b 5d c3 8bc3 5b }
            // n = 7, score = 300
            //   5e                   | dec                 ecx
            //   8bc3                 | mov                 ecx, esi
            //   5b                   | call                ebx
            //   5d                   | inc                 ecx
            //   c3                   | cmp                 dword ptr [edi + 0x8c], 0
            //   8bc3                 | inc                 ecx
            //   5b                   | mov                 eax, 0x30

        $sequence_15 = { c60600 803f22 7501 47 5e 8bc7 }
            // n = 6, score = 300
            //   c60600               | inc                 ecx
            //   803f22               | mov                 edx, dword ptr [eax]
            //   7501                 | inc                 ebp
            //   47                   | mov                 edx, dword ptr [ebx + 0x24]
            //   5e                   | xor                 ebp, ebp
            //   8bc7                 | dec                 ebp

        $sequence_16 = { 4d8bcf 33d2 41b800001000 488bce ff15???????? }
            // n = 5, score = 300
            //   4d8bcf               | dec                 ebp
            //   33d2                 | add                 eax, esi
            //   41b800001000         | dec                 ebp
            //   488bce               | add                 edx, esi
            //   ff15????????         |                     

        $sequence_17 = { 7405 f60001 7502 33c0 }
            // n = 4, score = 300
            //   7405                 | mov                 ecx, ebp
            //   f60001               | test                ebx, ebx
            //   7502                 | je                  0x82
            //   33c0                 | mov                 esi, dword ptr [esp + 0xb0]

        $sequence_18 = { e9???????? c6060d e9???????? c60609 e9???????? 8d4701 50 }
            // n = 7, score = 300
            //   e9????????           |                     
            //   c6060d               | test                ebx, ebx
            //   e9????????           |                     
            //   c60609               | je                  0x7f
            //   e9????????           |                     
            //   8d4701               | mov                 esi, dword ptr [esp + 0xb0]
            //   50                   | mov                 edx, edi

        $sequence_19 = { 7f0a 0fbec0 83c0d0 03c1 5d }
            // n = 5, score = 300
            //   7f0a                 | test                ebx, ebx
            //   0fbec0               | je                  0x8a
            //   83c0d0               | dec                 eax
            //   03c1                 | test                eax, eax
            //   5d                   | jne                 0x14

        $sequence_20 = { e8???????? 83c404 50 53 e8???????? 50 e8???????? }
            // n = 7, score = 300
            //   e8????????           |                     
            //   83c404               | mov                 edx, dword ptr [eax]
            //   50                   | mov                 ecx, ebp
            //   53                   | dec                 ecx
            //   e8????????           |                     
            //   50                   | add                 edx, esi
            //   e8????????           |                     

        $sequence_21 = { 8955f8 b804000000 8945fc 81fa80000000 7307 b801000000 }
            // n = 6, score = 300
            //   8955f8               | je                  0xcd
            //   b804000000           | inc                 ebp
            //   8945fc               | mov                 ebx, dword ptr [edi + 0x88]
            //   81fa80000000         | je                  0x9e
            //   7307                 | mov                 esi, dword ptr [esp + 0xb0]
            //   b801000000           | inc                 ecx

        $sequence_22 = { 488d4b10 488d542450 41b804000000 c6430f68 }
            // n = 4, score = 300
            //   488d4b10             | inc                 ebp
            //   488d542450           | mov                 ebx, dword ptr [edi + 0x88]
            //   41b804000000         | dec                 ebp
            //   c6430f68             | add                 ebx, esi

        $sequence_23 = { 335df0 6a10 e8???????? 83c40c 8bf0 8d45f8 }
            // n = 6, score = 300
            //   335df0               | add                 eax, esi
            //   6a10                 | dec                 ebp
            //   e8????????           |                     
            //   83c40c               | add                 edx, esi
            //   8bf0                 | inc                 esp
            //   8d45f8               | mov                 ecx, ebp

        $sequence_24 = { 6683f809 7505 8d7b02 eb09 6685c0 }
            // n = 5, score = 300
            //   6683f809             | inc                 ecx
            //   7505                 | cmp                 dword ptr [ebx + 0x14], 0
            //   8d7b02               | mov                 edi, 1
            //   eb09                 | mov                 edx, edi
            //   6685c0               | dec                 ecx

        $sequence_25 = { 4d8bc7 488bd0 488bce ff15???????? 85c0 }
            // n = 5, score = 300
            //   4d8bc7               | call                ebx
            //   488bd0               | inc                 ecx
            //   488bce               | cmp                 dword ptr [edi + 0x8c], 0
            //   ff15????????         |                     
            //   85c0                 | je                  0xc3

    condition:
        7 of them and filesize < 434176
}