rule win_lockbit_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.lockbit."
        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.lockbit"
        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 = { 894f08 89570c f745f800000002 740c 5f 5e }
            // n = 6, score = 300
            //   894f08               | mov                 dword ptr [edi + 8], ecx
            //   89570c               | mov                 dword ptr [edi + 0xc], edx
            //   f745f800000002       | test                dword ptr [ebp - 8], 0x2000000
            //   740c                 | je                  0xe
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_1 = { 8d8550fdffff 50 6a00 ff15???????? }
            // n = 4, score = 300
            //   8d8550fdffff         | lea                 eax, [ebp - 0x2b0]
            //   50                   | push                eax
            //   6a00                 | push                0
            //   ff15????????         |                     

        $sequence_2 = { 6a00 6a00 6800000040 ff75d4 }
            // n = 4, score = 300
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6800000040           | push                0x40000000
            //   ff75d4               | push                dword ptr [ebp - 0x2c]

        $sequence_3 = { f266af f7d1 49 8bc1 5f 59 }
            // n = 6, score = 300
            //   f266af               | repne scasw         ax, word ptr es:[edi]
            //   f7d1                 | not                 ecx
            //   49                   | dec                 ecx
            //   8bc1                 | mov                 eax, ecx
            //   5f                   | pop                 edi
            //   59                   | pop                 ecx

        $sequence_4 = { 56 57 33c0 8b5d14 33c9 33d2 }
            // n = 6, score = 300
            //   56                   | push                esi
            //   57                   | push                edi
            //   33c0                 | xor                 eax, eax
            //   8b5d14               | mov                 ebx, dword ptr [ebp + 0x14]
            //   33c9                 | xor                 ecx, ecx
            //   33d2                 | xor                 edx, edx

        $sequence_5 = { 5b 8907 897704 894f08 89570c 837df001 }
            // n = 6, score = 300
            //   5b                   | pop                 ebx
            //   8907                 | mov                 dword ptr [edi], eax
            //   897704               | mov                 dword ptr [edi + 4], esi
            //   894f08               | mov                 dword ptr [edi + 8], ecx
            //   89570c               | mov                 dword ptr [edi + 0xc], edx
            //   837df001             | cmp                 dword ptr [ebp - 0x10], 1

        $sequence_6 = { 75d8 8bc2 5e 5a 59 }
            // n = 5, score = 300
            //   75d8                 | jne                 0xffffffda
            //   8bc2                 | mov                 eax, edx
            //   5e                   | pop                 esi
            //   5a                   | pop                 edx
            //   59                   | pop                 ecx

        $sequence_7 = { 53 56 57 33c0 8d7df0 33c9 }
            // n = 6, score = 300
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   33c0                 | xor                 eax, eax
            //   8d7df0               | lea                 edi, [ebp - 0x10]
            //   33c9                 | xor                 ecx, ecx

        $sequence_8 = { 33d0 8bc1 c1e810 0fb6c0 c1e208 }
            // n = 5, score = 300
            //   33d0                 | xor                 edx, eax
            //   8bc1                 | mov                 eax, ecx
            //   c1e810               | shr                 eax, 0x10
            //   0fb6c0               | movzx               eax, al
            //   c1e208               | shl                 edx, 8

        $sequence_9 = { 6a02 ff750c ff7508 6a00 }
            // n = 4, score = 300
            //   6a02                 | push                2
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   ff7508               | push                dword ptr [ebp + 8]
            //   6a00                 | push                0

        $sequence_10 = { 53 50 e8???????? 85c0 7479 53 }
            // n = 6, score = 300
            //   53                   | push                ebx
            //   50                   | push                eax
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7479                 | je                  0x7b
            //   53                   | push                ebx

        $sequence_11 = { 51 57 6633c0 83c9ff 8b7d08 }
            // n = 5, score = 300
            //   51                   | push                ecx
            //   57                   | push                edi
            //   6633c0               | xor                 ax, ax
            //   83c9ff               | or                  ecx, 0xffffffff
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]

        $sequence_12 = { 32c1 aa e9???????? 5f }
            // n = 4, score = 300
            //   32c1                 | xor                 al, cl
            //   aa                   | stosb               byte ptr es:[edi], al
            //   e9????????           |                     
            //   5f                   | pop                 edi

        $sequence_13 = { 66833f20 74f7 8d857cffffff 50 57 e8???????? ff750c }
            // n = 7, score = 300
            //   66833f20             | cmp                 word ptr [edi], 0x20
            //   74f7                 | je                  0xfffffff9
            //   8d857cffffff         | lea                 eax, [ebp - 0x84]
            //   50                   | push                eax
            //   57                   | push                edi
            //   e8????????           |                     
            //   ff750c               | push                dword ptr [ebp + 0xc]

        $sequence_14 = { 33c0 8d7df0 33c9 53 0fa2 8bf3 5b }
            // n = 7, score = 300
            //   33c0                 | xor                 eax, eax
            //   8d7df0               | lea                 edi, [ebp - 0x10]
            //   33c9                 | xor                 ecx, ecx
            //   53                   | push                ebx
            //   0fa2                 | cpuid               
            //   8bf3                 | mov                 esi, ebx
            //   5b                   | pop                 ebx

        $sequence_15 = { 0f28c8 660f73f904 660fefc8 0f28c1 660f73f804 }
            // n = 5, score = 300
            //   0f28c8               | movaps              xmm1, xmm0
            //   660f73f904           | pslldq              xmm1, 4
            //   660fefc8             | pxor                xmm1, xmm0
            //   0f28c1               | movaps              xmm0, xmm1
            //   660f73f804           | pslldq              xmm0, 4

        $sequence_16 = { 8d45f8 50 8d45fc 50 ff75fc ff75f4 }
            // n = 6, score = 300
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   50                   | push                eax
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   50                   | push                eax
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ff75f4               | push                dword ptr [ebp - 0xc]

        $sequence_17 = { 6683e857 eb14 6683f830 720c 6683f839 }
            // n = 5, score = 300
            //   6683e857             | sub                 ax, 0x57
            //   eb14                 | jmp                 0x16
            //   6683f830             | cmp                 ax, 0x30
            //   720c                 | jb                  0xe
            //   6683f839             | cmp                 ax, 0x39

    condition:
        7 of them and filesize < 2049024
}