rule win_lockbit_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        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 = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { 8d06 50 e8???????? 3d75809176 740e }
            // n = 5, score = 300
            //   8d06                 | lea                 eax, [esi]
            //   50                   | push                eax
            //   e8????????           |                     
            //   3d75809176           | cmp                 eax, 0x76918075
            //   740e                 | je                  0x10

        $sequence_1 = { 7407 3d9bb4840b 7518 8b4e0c 03cb ff759c }
            // n = 6, score = 300
            //   7407                 | je                  9
            //   3d9bb4840b           | cmp                 eax, 0xb84b49b
            //   7518                 | jne                 0x1a
            //   8b4e0c               | mov                 ecx, dword ptr [esi + 0xc]
            //   03cb                 | add                 ecx, ebx
            //   ff759c               | push                dword ptr [ebp - 0x64]

        $sequence_2 = { 50 8d45fc 50 ff75fc ff75f4 }
            // n = 5, score = 300
            //   50                   | push                eax
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   50                   | push                eax
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ff75f4               | push                dword ptr [ebp - 0xc]

        $sequence_3 = { 8d45a0 50 e8???????? 8d858cfeffff 50 8d45c0 }
            // n = 6, score = 300
            //   8d45a0               | lea                 eax, [ebp - 0x60]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d858cfeffff         | lea                 eax, [ebp - 0x174]
            //   50                   | push                eax
            //   8d45c0               | lea                 eax, [ebp - 0x40]

        $sequence_4 = { 3d75ba0e64 752e 83c702 66833f20 74f7 8d857cffffff }
            // n = 6, score = 300
            //   3d75ba0e64           | cmp                 eax, 0x640eba75
            //   752e                 | jne                 0x30
            //   83c702               | add                 edi, 2
            //   66833f20             | cmp                 word ptr [edi], 0x20
            //   74f7                 | je                  0xfffffff9
            //   8d857cffffff         | lea                 eax, [ebp - 0x84]

        $sequence_5 = { 57 c745fc00000000 8b7d08 57 }
            // n = 4, score = 300
            //   57                   | push                edi
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   57                   | push                edi

        $sequence_6 = { ff759c 8d858cfeffff 50 ff7610 51 }
            // n = 5, score = 300
            //   ff759c               | push                dword ptr [ebp - 0x64]
            //   8d858cfeffff         | lea                 eax, [ebp - 0x174]
            //   50                   | push                eax
            //   ff7610               | push                dword ptr [esi + 0x10]
            //   51                   | push                ecx

        $sequence_7 = { 7702 0c20 02f1 2af1 }
            // n = 4, score = 300
            //   7702                 | ja                  4
            //   0c20                 | or                  al, 0x20
            //   02f1                 | add                 dh, cl
            //   2af1                 | sub                 dh, cl

        $sequence_8 = { 50 e8???????? 89459c e8???????? 8bd8 8b5b08 8b733c }
            // n = 7, score = 300
            //   50                   | push                eax
            //   e8????????           |                     
            //   89459c               | mov                 dword ptr [ebp - 0x64], eax
            //   e8????????           |                     
            //   8bd8                 | mov                 ebx, eax
            //   8b5b08               | mov                 ebx, dword ptr [ebx + 8]
            //   8b733c               | mov                 esi, dword ptr [ebx + 0x3c]

        $sequence_9 = { 888424e1040000 33ff c68424e204000000 57 }
            // n = 4, score = 100
            //   888424e1040000       | mov                 byte ptr [esp + 0x4e1], al
            //   33ff                 | xor                 edi, edi
            //   c68424e204000000     | mov                 byte ptr [esp + 0x4e2], 0
            //   57                   | push                edi

        $sequence_10 = { 888424e1020000 e8???????? 6a6e 8d8c24d4020000 888424e2020000 }
            // n = 5, score = 100
            //   888424e1020000       | mov                 byte ptr [esp + 0x2e1], al
            //   e8????????           |                     
            //   6a6e                 | push                0x6e
            //   8d8c24d4020000       | lea                 ecx, [esp + 0x2d4]
            //   888424e2020000       | mov                 byte ptr [esp + 0x2e2], al

        $sequence_11 = { 888424e1030000 e8???????? 6a72 8d8c24cc030000 }
            // n = 4, score = 100
            //   888424e1030000       | mov                 byte ptr [esp + 0x3e1], al
            //   e8????????           |                     
            //   6a72                 | push                0x72
            //   8d8c24cc030000       | lea                 ecx, [esp + 0x3cc]

        $sequence_12 = { 888424e2000000 e8???????? 888424df000000 33ff c68424e000000000 57 8d8c24dd000000 }
            // n = 7, score = 100
            //   888424e2000000       | mov                 byte ptr [esp + 0xe2], al
            //   e8????????           |                     
            //   888424df000000       | mov                 byte ptr [esp + 0xdf], al
            //   33ff                 | xor                 edi, edi
            //   c68424e000000000     | mov                 byte ptr [esp + 0xe0], 0
            //   57                   | push                edi
            //   8d8c24dd000000       | lea                 ecx, [esp + 0xdd]

        $sequence_13 = { 888424e1040000 e8???????? 6a65 8d8c24c1040000 }
            // n = 4, score = 100
            //   888424e1040000       | mov                 byte ptr [esp + 0x4e1], al
            //   e8????????           |                     
            //   6a65                 | push                0x65
            //   8d8c24c1040000       | lea                 ecx, [esp + 0x4c1]

        $sequence_14 = { 888424e1060000 32e9 8a442412 32d1 }
            // n = 4, score = 100
            //   888424e1060000       | mov                 byte ptr [esp + 0x6e1], al
            //   32e9                 | xor                 ch, cl
            //   8a442412             | mov                 al, byte ptr [esp + 0x12]
            //   32d1                 | xor                 dl, cl

        $sequence_15 = { 888424e2010000 e8???????? 6a65 8d8c24da010000 }
            // n = 4, score = 100
            //   888424e2010000       | mov                 byte ptr [esp + 0x1e2], al
            //   e8????????           |                     
            //   6a65                 | push                0x65
            //   8d8c24da010000       | lea                 ecx, [esp + 0x1da]

    condition:
        7 of them and filesize < 360448
}