rule win_bunitu_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.bunitu."
        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.bunitu"
        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 = { 68???????? 50 6a00 68???????? 6a00 50 ff15???????? }
            // n = 7, score = 1300
            //   68????????           |                     
            //   50                   | push                eax
            //   6a00                 | push                0
            //   68????????           |                     
            //   6a00                 | push                0
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_1 = { 57 52 8b7d08 8b750c 8b4d10 49 }
            // n = 6, score = 1300
            //   57                   | push                edi
            //   52                   | push                edx
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   8b750c               | mov                 esi, dword ptr [ebp + 0xc]
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   49                   | dec                 ecx

        $sequence_2 = { 68ffff0000 ffb530feffff e8???????? 837d0c00 7505 8b4508 }
            // n = 6, score = 1300
            //   68ffff0000           | push                0xffff
            //   ffb530feffff         | push                dword ptr [ebp - 0x1d0]
            //   e8????????           |                     
            //   837d0c00             | cmp                 dword ptr [ebp + 0xc], 0
            //   7505                 | jne                 7
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]

        $sequence_3 = { 6689bddcfeffff e9???????? 80bd2ffdffff01 7414 }
            // n = 4, score = 1300
            //   6689bddcfeffff       | mov                 word ptr [ebp - 0x124], di
            //   e9????????           |                     
            //   80bd2ffdffff01       | cmp                 byte ptr [ebp - 0x2d1], 1
            //   7414                 | je                  0x16

        $sequence_4 = { 52 6800000100 8b8544feffff 8b9530feffff 899074130000 8b5510 899078130000 }
            // n = 7, score = 1300
            //   52                   | push                edx
            //   6800000100           | push                0x10000
            //   8b8544feffff         | mov                 eax, dword ptr [ebp - 0x1bc]
            //   8b9530feffff         | mov                 edx, dword ptr [ebp - 0x1d0]
            //   899074130000         | mov                 dword ptr [eax + 0x1374], edx
            //   8b5510               | mov                 edx, dword ptr [ebp + 0x10]
            //   899078130000         | mov                 dword ptr [eax + 0x1378], edx

        $sequence_5 = { 0fb6c0 c1e002 bf???????? 03f8 }
            // n = 4, score = 1300
            //   0fb6c0               | movzx               eax, al
            //   c1e002               | shl                 eax, 2
            //   bf????????           |                     
            //   03f8                 | add                 edi, eax

        $sequence_6 = { 52 6800000100 51 68???????? }
            // n = 4, score = 1300
            //   52                   | push                edx
            //   6800000100           | push                0x10000
            //   51                   | push                ecx
            //   68????????           |                     

        $sequence_7 = { 59 5d 5a 8bca }
            // n = 4, score = 1300
            //   59                   | pop                 ecx
            //   5d                   | pop                 ebp
            //   5a                   | pop                 edx
            //   8bca                 | mov                 ecx, edx

        $sequence_8 = { ff15???????? 33c0 40 40 50 ffb528fdffff }
            // n = 6, score = 1300
            //   ff15????????         |                     
            //   33c0                 | xor                 eax, eax
            //   40                   | inc                 eax
            //   40                   | inc                 eax
            //   50                   | push                eax
            //   ffb528fdffff         | push                dword ptr [ebp - 0x2d8]

        $sequence_9 = { 2bfa 87fa 5f 8bc2 }
            // n = 4, score = 1300
            //   2bfa                 | sub                 edi, edx
            //   87fa                 | xchg                edx, edi
            //   5f                   | pop                 edi
            //   8bc2                 | mov                 eax, edx

    condition:
        7 of them and filesize < 221184
}