rule win_helauto_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.helauto."
        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.helauto"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { e9???????? b902010000 33c0 8dbd9de5ffff c6859ce5ffff30 f3ab }
            // n = 6, score = 100
            //   e9????????           |                     
            //   b902010000           | mov                 ecx, 0x102
            //   33c0                 | xor                 eax, eax
            //   8dbd9de5ffff         | lea                 edi, [ebp - 0x1a63]
            //   c6859ce5ffff30       | mov                 byte ptr [ebp - 0x1a64], 0x30
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax

        $sequence_1 = { 50 ff75fc e8???????? e9???????? 56 }
            // n = 5, score = 100
            //   50                   | push                eax
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   e8????????           |                     
            //   e9????????           |                     
            //   56                   | push                esi

        $sequence_2 = { 84c0 0f8472040000 8b3d???????? 6a04 8d85a8f3ffff 68???????? }
            // n = 6, score = 100
            //   84c0                 | test                al, al
            //   0f8472040000         | je                  0x478
            //   8b3d????????         |                     
            //   6a04                 | push                4
            //   8d85a8f3ffff         | lea                 eax, [ebp - 0xc58]
            //   68????????           |                     

        $sequence_3 = { 6830750000 eb48 ff75fc 8b35???????? ffd6 }
            // n = 5, score = 100
            //   6830750000           | push                0x7530
            //   eb48                 | jmp                 0x4a
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   8b35????????         |                     
            //   ffd6                 | call                esi

        $sequence_4 = { 85c0 0f8443050000 8b45f0 3b45cc 752c 8d85a8f9ffff }
            // n = 6, score = 100
            //   85c0                 | test                eax, eax
            //   0f8443050000         | je                  0x549
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   3b45cc               | cmp                 eax, dword ptr [ebp - 0x34]
            //   752c                 | jne                 0x2e
            //   8d85a8f9ffff         | lea                 eax, [ebp - 0x658]

        $sequence_5 = { ff15???????? 59 40 59 8945f8 }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   59                   | pop                 ecx
            //   40                   | inc                 eax
            //   59                   | pop                 ecx
            //   8945f8               | mov                 dword ptr [ebp - 8], eax

        $sequence_6 = { e9???????? 6a06 8d4df0 58 }
            // n = 4, score = 100
            //   e9????????           |                     
            //   6a06                 | push                6
            //   8d4df0               | lea                 ecx, [ebp - 0x10]
            //   58                   | pop                 eax

        $sequence_7 = { 83c40c 85c0 0f8593000000 50 }
            // n = 4, score = 100
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax
            //   0f8593000000         | jne                 0x99
            //   50                   | push                eax

        $sequence_8 = { ff15???????? 53 8d85a8f8ffff 68???????? 50 e8???????? }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   53                   | push                ebx
            //   8d85a8f8ffff         | lea                 eax, [ebp - 0x758]
            //   68????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_9 = { 8bec 53 8b5d0c ff7518 68ff030000 53 ff7508 }
            // n = 7, score = 100
            //   8bec                 | mov                 ebp, esp
            //   53                   | push                ebx
            //   8b5d0c               | mov                 ebx, dword ptr [ebp + 0xc]
            //   ff7518               | push                dword ptr [ebp + 0x18]
            //   68ff030000           | push                0x3ff
            //   53                   | push                ebx
            //   ff7508               | push                dword ptr [ebp + 8]

    condition:
        7 of them and filesize < 57344
}