rule elf_babuk_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-10-07"
        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 = "20221007"
        malpedia_hash = "597f9539014e3d0f350c069cd804aa71679486ae"
        malpedia_version = "20221010"
        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 = { 8b9c2460030000 8bb424d8010000 01f3 11d1 8b54246c 8b9c2454020000 0fafd3 }
            // n = 7, score = 200
            //   8b9c2460030000       | mov                 ebx, dword ptr [esp + 0x360]
            //   8bb424d8010000       | mov                 esi, dword ptr [esp + 0x1d8]
            //   01f3                 | add                 ebx, esi
            //   11d1                 | adc                 ecx, edx
            //   8b54246c             | mov                 edx, dword ptr [esp + 0x6c]
            //   8b9c2454020000       | mov                 ebx, dword ptr [esp + 0x254]
            //   0fafd3               | imul                edx, ebx

        $sequence_1 = { 890424 e8???????? 0fb6442404 84c0 7409 e8???????? 83c410 }
            // n = 7, score = 200
            //   890424               | mov                 dword ptr [esp], eax
            //   e8????????           |                     
            //   0fb6442404           | movzx               eax, byte ptr [esp + 4]
            //   84c0                 | test                al, al
            //   7409                 | je                  0xb
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10

        $sequence_2 = { c1ea05 899424c8000000 6bc264 8b9c249c000000 29c3 b8285c8f02 f7e3 }
            // n = 7, score = 200
            //   c1ea05               | shr                 edx, 5
            //   899424c8000000       | mov                 dword ptr [esp + 0xc8], edx
            //   6bc264               | imul                eax, edx, 0x64
            //   8b9c249c000000       | mov                 ebx, dword ptr [esp + 0x9c]
            //   29c3                 | sub                 ebx, eax
            //   b8285c8f02           | mov                 eax, 0x28f5c28
            //   f7e3                 | mul                 ebx

        $sequence_3 = { 8bac2490010000 01cd 89ac24b8030000 8b8c2468010000 01e9 898c24b4030000 8bac243c010000 }
            // n = 7, score = 200
            //   8bac2490010000       | mov                 ebp, dword ptr [esp + 0x190]
            //   01cd                 | add                 ebp, ecx
            //   89ac24b8030000       | mov                 dword ptr [esp + 0x3b8], ebp
            //   8b8c2468010000       | mov                 ecx, dword ptr [esp + 0x168]
            //   01e9                 | add                 ecx, ebp
            //   898c24b4030000       | mov                 dword ptr [esp + 0x3b4], ecx
            //   8bac243c010000       | mov                 ebp, dword ptr [esp + 0x13c]

        $sequence_4 = { 8b89fcffffff 3b6108 0f86ac000000 83ec1c 8b442428 890424 e8???????? }
            // n = 7, score = 200
            //   8b89fcffffff         | mov                 ecx, dword ptr [ecx - 4]
            //   3b6108               | cmp                 esp, dword ptr [ecx + 8]
            //   0f86ac000000         | jbe                 0xb2
            //   83ec1c               | sub                 esp, 0x1c
            //   8b442428             | mov                 eax, dword ptr [esp + 0x28]
            //   890424               | mov                 dword ptr [esp], eax
            //   e8????????           |                     

        $sequence_5 = { 8b9c2498000000 8d04d8 8b9c2494000000 01d8 8b9c2490000000 8d2c18 8d4c0314 }
            // n = 7, score = 200
            //   8b9c2498000000       | mov                 ebx, dword ptr [esp + 0x98]
            //   8d04d8               | lea                 eax, [eax + ebx*8]
            //   8b9c2494000000       | mov                 ebx, dword ptr [esp + 0x94]
            //   01d8                 | add                 eax, ebx
            //   8b9c2490000000       | mov                 ebx, dword ptr [esp + 0x90]
            //   8d2c18               | lea                 ebp, [eax + ebx]
            //   8d4c0314             | lea                 ecx, [ebx + eax + 0x14]

        $sequence_6 = { 8b7c2404 8b442448 894704 8b05???????? 85c0 7556 8b842484000000 }
            // n = 7, score = 200
            //   8b7c2404             | mov                 edi, dword ptr [esp + 4]
            //   8b442448             | mov                 eax, dword ptr [esp + 0x48]
            //   894704               | mov                 dword ptr [edi + 4], eax
            //   8b05????????         |                     
            //   85c0                 | test                eax, eax
            //   7556                 | jne                 0x58
            //   8b842484000000       | mov                 eax, dword ptr [esp + 0x84]

        $sequence_7 = { c744241000010000 e8???????? 8b442414 8b4c2418 8b542414 8b5c2414 8b6c2418 }
            // n = 7, score = 200
            //   c744241000010000     | mov                 dword ptr [esp + 0x10], 0x100
            //   e8????????           |                     
            //   8b442414             | mov                 eax, dword ptr [esp + 0x14]
            //   8b4c2418             | mov                 ecx, dword ptr [esp + 0x18]
            //   8b542414             | mov                 edx, dword ptr [esp + 0x14]
            //   8b5c2414             | mov                 ebx, dword ptr [esp + 0x14]
            //   8b6c2418             | mov                 ebp, dword ptr [esp + 0x18]

        $sequence_8 = { 8b9c2480000000 8d6c1801 807d002e 0f851a050000 8d6802 39ee 0f85db020000 }
            // n = 7, score = 200
            //   8b9c2480000000       | mov                 ebx, dword ptr [esp + 0x80]
            //   8d6c1801             | lea                 ebp, [eax + ebx + 1]
            //   807d002e             | cmp                 byte ptr [ebp], 0x2e
            //   0f851a050000         | jne                 0x520
            //   8d6802               | lea                 ebp, [eax + 2]
            //   39ee                 | cmp                 esi, ebp
            //   0f85db020000         | jne                 0x2e1

        $sequence_9 = { 0f84c0000000 85f6 0f859a000000 8b442438 890424 }
            // n = 5, score = 200
            //   0f84c0000000         | je                  0xc6
            //   85f6                 | test                esi, esi
            //   0f859a000000         | jne                 0xa0
            //   8b442438             | mov                 eax, dword ptr [esp + 0x38]
            //   890424               | mov                 dword ptr [esp], eax

    condition:
        7 of them and filesize < 4186112
}