rule win_lazarus_killdisk_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        version = "1"
        description = "Detects win.lazarus_killdisk."
        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.lazarus_killdisk"
        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 = { c745f802000000 ff15???????? 6a00 6a02 ff15???????? 8bf0 89b5bcfeffff }
            // n = 7, score = 200
            //   c745f802000000       | mov                 dword ptr [ebp - 8], 2
            //   ff15????????         |                     
            //   6a00                 | push                0
            //   6a02                 | push                2
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   89b5bcfeffff         | mov                 dword ptr [ebp - 0x144], esi

        $sequence_1 = { 7405 83f802 7543 8a442410 }
            // n = 4, score = 200
            //   7405                 | je                  7
            //   83f802               | cmp                 eax, 2
            //   7543                 | jne                 0x45
            //   8a442410             | mov                 al, byte ptr [esp + 0x10]

        $sequence_2 = { 8b560c 8945e8 8b4604 8945ec 894df0 }
            // n = 5, score = 200
            //   8b560c               | mov                 edx, dword ptr [esi + 0xc]
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   894df0               | mov                 dword ptr [ebp - 0x10], ecx

        $sequence_3 = { 57 8945f0 ff15???????? 3b45f0 7517 6a00 }
            // n = 6, score = 200
            //   57                   | push                edi
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   ff15????????         |                     
            //   3b45f0               | cmp                 eax, dword ptr [ebp - 0x10]
            //   7517                 | jne                 0x19
            //   6a00                 | push                0

        $sequence_4 = { c785e4fdffff00000000 8d75a6 8b06 8b4e08 8b560c 8945e8 8b4604 }
            // n = 7, score = 200
            //   c785e4fdffff00000000     | mov    dword ptr [ebp - 0x21c], 0
            //   8d75a6               | lea                 esi, [ebp - 0x5a]
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   8b4e08               | mov                 ecx, dword ptr [esi + 8]
            //   8b560c               | mov                 edx, dword ptr [esi + 0xc]
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   8b4604               | mov                 eax, dword ptr [esi + 4]

        $sequence_5 = { 8945f8 8b4508 53 8b5808 56 }
            // n = 5, score = 200
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   53                   | push                ebx
            //   8b5808               | mov                 ebx, dword ptr [eax + 8]
            //   56                   | push                esi

        $sequence_6 = { e8???????? 8d442454 83c410 33f6 }
            // n = 4, score = 200
            //   e8????????           |                     
            //   8d442454             | lea                 eax, [esp + 0x54]
            //   83c410               | add                 esp, 0x10
            //   33f6                 | xor                 esi, esi

        $sequence_7 = { 8b4dfc ff0d???????? 33cd 83c410 }
            // n = 4, score = 200
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   ff0d????????         |                     
            //   33cd                 | xor                 ecx, ebp
            //   83c410               | add                 esp, 0x10

        $sequence_8 = { 8b4da6 8b55ae 8945e8 8b45aa }
            // n = 4, score = 200
            //   8b4da6               | mov                 ecx, dword ptr [ebp - 0x5a]
            //   8b55ae               | mov                 edx, dword ptr [ebp - 0x52]
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   8b45aa               | mov                 eax, dword ptr [ebp - 0x56]

        $sequence_9 = { c1e009 51 50 57 8945f0 89b5e4fdffff }
            // n = 6, score = 200
            //   c1e009               | shl                 eax, 9
            //   51                   | push                ecx
            //   50                   | push                eax
            //   57                   | push                edi
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   89b5e4fdffff         | mov                 dword ptr [ebp - 0x21c], esi

    condition:
        7 of them and filesize < 209920
}