rule win_lockbit_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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 = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 88842475030000 e8???????? 6a73 8d8c246e030000 88842476030000 e8???????? 6a6b }
            // n = 7, score = 100
            //   88842475030000       | mov                 byte ptr [esp + 0x375], al
            //   e8????????           |                     
            //   6a73                 | push                0x73
            //   8d8c246e030000       | lea                 ecx, [esp + 0x36e]
            //   88842476030000       | mov                 byte ptr [esp + 0x376], al
            //   e8????????           |                     
            //   6a6b                 | push                0x6b

        $sequence_1 = { c78550fcffff6f007700 c78554fcffff73002e00 c78558fcffff6f006c00 c7855cfcffff64000000 c78578fdffff61007000 c7857cfdffff70006400 c78580fdffff61007400 }
            // n = 7, score = 100
            //   c78550fcffff6f007700     | mov    dword ptr [ebp - 0x3b0], 0x77006f
            //   c78554fcffff73002e00     | mov    dword ptr [ebp - 0x3ac], 0x2e0073
            //   c78558fcffff6f006c00     | mov    dword ptr [ebp - 0x3a8], 0x6c006f
            //   c7855cfcffff64000000     | mov    dword ptr [ebp - 0x3a4], 0x64
            //   c78578fdffff61007000     | mov    dword ptr [ebp - 0x288], 0x700061
            //   c7857cfdffff70006400     | mov    dword ptr [ebp - 0x284], 0x640070
            //   c78580fdffff61007400     | mov    dword ptr [ebp - 0x280], 0x740061

        $sequence_2 = { 33d2 8ac8 bf10000000 2bfa 85d2 0f4efa 80e10f }
            // n = 7, score = 100
            //   33d2                 | xor                 edx, edx
            //   8ac8                 | mov                 cl, al
            //   bf10000000           | mov                 edi, 0x10
            //   2bfa                 | sub                 edi, edx
            //   85d2                 | test                edx, edx
            //   0f4efa               | cmovle              edi, edx
            //   80e10f               | and                 cl, 0xf

        $sequence_3 = { c78508ffffff73007100 c7850cffffff76002000 c78510ffffff71005300 66898524ffffff 0fb705???????? 6683f053 66898526ffffff }
            // n = 7, score = 100
            //   c78508ffffff73007100     | mov    dword ptr [ebp - 0xf8], 0x710073
            //   c7850cffffff76002000     | mov    dword ptr [ebp - 0xf4], 0x200076
            //   c78510ffffff71005300     | mov    dword ptr [ebp - 0xf0], 0x530071
            //   66898524ffffff       | mov                 word ptr [ebp - 0xdc], ax
            //   0fb705????????       |                     
            //   6683f053             | xor                 ax, 0x53
            //   66898526ffffff       | mov                 word ptr [ebp - 0xda], ax

        $sequence_4 = { c644240b20 32842452060000 88842453060000 8a44240b 888c2454060000 8a8c2452060000 32c1 }
            // n = 7, score = 100
            //   c644240b20           | mov                 byte ptr [esp + 0xb], 0x20
            //   32842452060000       | xor                 al, byte ptr [esp + 0x652]
            //   88842453060000       | mov                 byte ptr [esp + 0x653], al
            //   8a44240b             | mov                 al, byte ptr [esp + 0xb]
            //   888c2454060000       | mov                 byte ptr [esp + 0x654], cl
            //   8a8c2452060000       | mov                 cl, byte ptr [esp + 0x652]
            //   32c1                 | xor                 al, cl

        $sequence_5 = { 0fb705???????? 6683f038 668945de 0fb705???????? 6683f038 668945e0 }
            // n = 6, score = 100
            //   0fb705????????       |                     
            //   6683f038             | xor                 ax, 0x38
            //   668945de             | mov                 word ptr [ebp - 0x22], ax
            //   0fb705????????       |                     
            //   6683f038             | xor                 ax, 0x38
            //   668945e0             | mov                 word ptr [ebp - 0x20], ax

        $sequence_6 = { 0fb705???????? 6683f053 6689458e 0fb705???????? 6683f053 66894590 }
            // n = 6, score = 100
            //   0fb705????????       |                     
            //   6683f053             | xor                 ax, 0x53
            //   6689458e             | mov                 word ptr [ebp - 0x72], ax
            //   0fb705????????       |                     
            //   6683f053             | xor                 ax, 0x53
            //   66894590             | mov                 word ptr [ebp - 0x70], ax

        $sequence_7 = { 895df4 e8???????? 8d45d8 50 e8???????? 6a00 6a00 }
            // n = 7, score = 100
            //   895df4               | mov                 dword ptr [ebp - 0xc], ebx
            //   e8????????           |                     
            //   8d45d8               | lea                 eax, [ebp - 0x28]
            //   50                   | push                eax
            //   e8????????           |                     
            //   6a00                 | push                0
            //   6a00                 | push                0

        $sequence_8 = { 68???????? e8???????? 83c414 eb14 6a10 8d442444 50 }
            // n = 7, score = 100
            //   68????????           |                     
            //   e8????????           |                     
            //   83c414               | add                 esp, 0x14
            //   eb14                 | jmp                 0x16
            //   6a10                 | push                0x10
            //   8d442444             | lea                 eax, [esp + 0x44]
            //   50                   | push                eax

        $sequence_9 = { 88842479060000 8a842478060000 32c8 c68424e505000000 32e8 888c247a060000 32d0 }
            // n = 7, score = 100
            //   88842479060000       | mov                 byte ptr [esp + 0x679], al
            //   8a842478060000       | mov                 al, byte ptr [esp + 0x678]
            //   32c8                 | xor                 cl, al
            //   c68424e505000000     | mov                 byte ptr [esp + 0x5e5], 0
            //   32e8                 | xor                 ch, al
            //   888c247a060000       | mov                 byte ptr [esp + 0x67a], cl
            //   32d0                 | xor                 dl, al

    condition:
        7 of them and filesize < 337568
}