rule elf_babuk_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects elf.babuk."
        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/elf.babuk"
        malpedia_rule_date = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 8d842488000000 890424 89442404 e8???????? 8d842428010000 890424 89442404 }
            // n = 7, score = 200
            //   8d842488000000       | lea                 eax, dword ptr [esp + 0x88]
            //   890424               | mov                 dword ptr [esp], eax
            //   89442404             | mov                 dword ptr [esp + 4], eax
            //   e8????????           |                     
            //   8d842428010000       | lea                 eax, dword ptr [esp + 0x128]
            //   890424               | mov                 dword ptr [esp], eax
            //   89442404             | mov                 dword ptr [esp + 4], eax

        $sequence_1 = { e8???????? 8b442458 0548010000 890424 8b44243c 89442404 e8???????? }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8b442458             | mov                 eax, dword ptr [esp + 0x58]
            //   0548010000           | add                 eax, 0x148
            //   890424               | mov                 dword ptr [esp], eax
            //   8b44243c             | mov                 eax, dword ptr [esp + 0x3c]
            //   89442404             | mov                 dword ptr [esp + 4], eax
            //   e8????????           |                     

        $sequence_2 = { 8b89fcffffff 3b6108 0f8636090000 83ec7c 8b8c2484000000 85c9 0f8402080000 }
            // n = 7, score = 200
            //   8b89fcffffff         | mov                 ecx, dword ptr [ecx - 4]
            //   3b6108               | cmp                 esp, dword ptr [ecx + 8]
            //   0f8636090000         | jbe                 0x93c
            //   83ec7c               | sub                 esp, 0x7c
            //   8b8c2484000000       | mov                 ecx, dword ptr [esp + 0x84]
            //   85c9                 | test                ecx, ecx
            //   0f8402080000         | je                  0x808

        $sequence_3 = { c6470c01 31c0 31c9 83f904 7d12 c6470c01 c744240800000000 }
            // n = 7, score = 200
            //   c6470c01             | mov                 byte ptr [edi + 0xc], 1
            //   31c0                 | xor                 eax, eax
            //   31c9                 | xor                 ecx, ecx
            //   83f904               | cmp                 ecx, 4
            //   7d12                 | jge                 0x14
            //   c6470c01             | mov                 byte ptr [edi + 0xc], 1
            //   c744240800000000     | mov                 dword ptr [esp + 8], 0

        $sequence_4 = { e8???????? 8b05???????? 8b4c2414 8901 8b442418 8b08 85c9 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8b05????????         |                     
            //   8b4c2414             | mov                 ecx, dword ptr [esp + 0x14]
            //   8901                 | mov                 dword ptr [ecx], eax
            //   8b442418             | mov                 eax, dword ptr [esp + 0x18]
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   85c9                 | test                ecx, ecx

        $sequence_5 = { 8b4c2420 894c2404 ffd0 8b442418 8b4c2418 8b5c241c 8b6c2418 }
            // n = 7, score = 200
            //   8b4c2420             | mov                 ecx, dword ptr [esp + 0x20]
            //   894c2404             | mov                 dword ptr [esp + 4], ecx
            //   ffd0                 | call                eax
            //   8b442418             | mov                 eax, dword ptr [esp + 0x18]
            //   8b4c2418             | mov                 ecx, dword ptr [esp + 0x18]
            //   8b5c241c             | mov                 ebx, dword ptr [esp + 0x1c]
            //   8b6c2418             | mov                 ebp, dword ptr [esp + 0x18]

        $sequence_6 = { c744243000000000 c744243400000000 c744242c00000020 c744243000000010 c744243400000008 8d81ffff4300 250000c0ff }
            // n = 7, score = 200
            //   c744243000000000     | mov                 dword ptr [esp + 0x30], 0
            //   c744243400000000     | mov                 dword ptr [esp + 0x34], 0
            //   c744242c00000020     | mov                 dword ptr [esp + 0x2c], 0x20000000
            //   c744243000000010     | mov                 dword ptr [esp + 0x30], 0x10000000
            //   c744243400000008     | mov                 dword ptr [esp + 0x34], 0x8000000
            //   8d81ffff4300         | lea                 eax, dword ptr [ecx + 0x43ffff]
            //   250000c0ff           | and                 eax, 0xffc00000

        $sequence_7 = { 8bbc249c000000 01fd 11d1 8b94247c010000 0fafd6 8d3cd2 8d147a }
            // n = 7, score = 200
            //   8bbc249c000000       | mov                 edi, dword ptr [esp + 0x9c]
            //   01fd                 | add                 ebp, edi
            //   11d1                 | adc                 ecx, edx
            //   8b94247c010000       | mov                 edx, dword ptr [esp + 0x17c]
            //   0fafd6               | imul                edx, esi
            //   8d3cd2               | lea                 edi, dword ptr [edx + edx*8]
            //   8d147a               | lea                 edx, dword ptr [edx + edi*2]

        $sequence_8 = { 8b7c2460 8b5c2464 85ff 7421 39d8 0f83ba070000 0fb61c07 }
            // n = 7, score = 200
            //   8b7c2460             | mov                 edi, dword ptr [esp + 0x60]
            //   8b5c2464             | mov                 ebx, dword ptr [esp + 0x64]
            //   85ff                 | test                edi, edi
            //   7421                 | je                  0x23
            //   39d8                 | cmp                 eax, ebx
            //   0f83ba070000         | jae                 0x7c0
            //   0fb61c07             | movzx               ebx, byte ptr [edi + eax]

        $sequence_9 = { 8b8424a4000000 89442404 897c2408 e8???????? 0fb644240c 84c0 751b }
            // n = 7, score = 200
            //   8b8424a4000000       | mov                 eax, dword ptr [esp + 0xa4]
            //   89442404             | mov                 dword ptr [esp + 4], eax
            //   897c2408             | mov                 dword ptr [esp + 8], edi
            //   e8????????           |                     
            //   0fb644240c           | movzx               eax, byte ptr [esp + 0xc]
            //   84c0                 | test                al, al
            //   751b                 | jne                 0x1d

    condition:
        7 of them and filesize < 4186112
}