rule win_betabot_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-12-06"
        version = "1"
        description = "Detects win.betabot."
        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.betabot"
        malpedia_rule_date = "20231130"
        malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351"
        malpedia_version = "20230808"
        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 = { 8d85e4f7ffff 89bde8f7ffff 50 33ff 56 47 56 }
            // n = 7, score = 400
            //   8d85e4f7ffff         | lea                 eax, [ebp - 0x81c]
            //   89bde8f7ffff         | mov                 dword ptr [ebp - 0x818], edi
            //   50                   | push                eax
            //   33ff                 | xor                 edi, edi
            //   56                   | push                esi
            //   47                   | inc                 edi
            //   56                   | push                esi

        $sequence_1 = { 8d44244c 50 ff15???????? 8d442448 50 e8???????? 8d442448 }
            // n = 7, score = 400
            //   8d44244c             | lea                 eax, [esp + 0x4c]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8d442448             | lea                 eax, [esp + 0x48]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d442448             | lea                 eax, [esp + 0x48]

        $sequence_2 = { 32c0 e9???????? 6a40 5e e8???????? a3???????? }
            // n = 6, score = 400
            //   32c0                 | xor                 al, al
            //   e9????????           |                     
            //   6a40                 | push                0x40
            //   5e                   | pop                 esi
            //   e8????????           |                     
            //   a3????????           |                     

        $sequence_3 = { 884617 2407 80fa40 7413 80fa80 7404 }
            // n = 6, score = 400
            //   884617               | mov                 byte ptr [esi + 0x17], al
            //   2407                 | and                 al, 7
            //   80fa40               | cmp                 dl, 0x40
            //   7413                 | je                  0x15
            //   80fa80               | cmp                 dl, 0x80
            //   7404                 | je                  6

        $sequence_4 = { 85c0 7503 6afd 58 5f 5e 5b }
            // n = 7, score = 400
            //   85c0                 | test                eax, eax
            //   7503                 | jne                 5
            //   6afd                 | push                -3
            //   58                   | pop                 eax
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

        $sequence_5 = { c20400 55 8bec 83ec18 53 56 8365f800 }
            // n = 7, score = 400
            //   c20400               | ret                 4
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   83ec18               | sub                 esp, 0x18
            //   53                   | push                ebx
            //   56                   | push                esi
            //   8365f800             | and                 dword ptr [ebp - 8], 0

        $sequence_6 = { a1???????? 85c0 740b 8d4dfc 51 ff7508 ffd0 }
            // n = 7, score = 400
            //   a1????????           |                     
            //   85c0                 | test                eax, eax
            //   740b                 | je                  0xd
            //   8d4dfc               | lea                 ecx, [ebp - 4]
            //   51                   | push                ecx
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ffd0                 | call                eax

        $sequence_7 = { bbb0040000 85f6 7433 a1???????? 48 50 }
            // n = 6, score = 400
            //   bbb0040000           | mov                 ebx, 0x4b0
            //   85f6                 | test                esi, esi
            //   7433                 | je                  0x35
            //   a1????????           |                     
            //   48                   | dec                 eax
            //   50                   | push                eax

        $sequence_8 = { 8a460a 3cb9 740c 3c33 7408 c70302000000 eb34 }
            // n = 7, score = 400
            //   8a460a               | mov                 al, byte ptr [esi + 0xa]
            //   3cb9                 | cmp                 al, 0xb9
            //   740c                 | je                  0xe
            //   3c33                 | cmp                 al, 0x33
            //   7408                 | je                  0xa
            //   c70302000000         | mov                 dword ptr [ebx], 2
            //   eb34                 | jmp                 0x36

        $sequence_9 = { 7470 66397508 746a 6a02 59 ff7508 66894de8 }
            // n = 7, score = 400
            //   7470                 | je                  0x72
            //   66397508             | cmp                 word ptr [ebp + 8], si
            //   746a                 | je                  0x6c
            //   6a02                 | push                2
            //   59                   | pop                 ecx
            //   ff7508               | push                dword ptr [ebp + 8]
            //   66894de8             | mov                 word ptr [ebp - 0x18], cx

    condition:
        7 of them and filesize < 835584
}

rule win_betabot_w0 {
    meta:
        author = "Venom23"
        date = "2013-06-21"
        description = "Neurevt Malware Sig"
        hash = "db9a816d58899f1ba92bc338e89f856a"
        hash = "d7b427ce3175fa7704da6b19a464938e"
        hash = "13027beb8aa5e891e8e641c05ccffde3"
        hash = "d1004b63d6d3cb90e6012c68e19ab453"
        hash = "a1286fd94984fd2de857f7b846062b5e"
        yaragenerator = "https://github.com/Xen0ph0n/YaraGenerator"
        source = "https://github.com/mattulm/sfiles_yara/blob/master/malware/Neurevt.yar"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.betabot"
        malpedia_version = "20170517"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    strings:
        $string0 = "BullGuard" wide
        $string1 = "cmd.exe" wide
        $string4 = "eUSERPROFILE" wide
        $string5 = "%c:\\%s.lnk" wide
        $string6 = "services.exe" wide
        $string9 = "Multiples archivos corruptos han sido encontrados en la carpeta \"Mis Documentos\". Para evitar perder" wide
        $string10 = "F-PROT Antivirus Tray application" wide
        $string12 = "-k NetworkService" wide
        $string13 = "firefox.exe"
        $string14 = "uWinMgr.exe" wide
        $string15 = "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.13) Gecko/20060410 Firefox/1.0.8"
        $string16 = "Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11"
        $string18 = "Data Path" wide

    condition:
        10 of them
}