rule win_betabot_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        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 = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { e8???????? 8325????????00 6a05 58 c3 68???????? e8???????? }
            // n = 7, score = 400
            //   e8????????           |                     
            //   8325????????00       |                     
            //   6a05                 | push                5
            //   58                   | pop                 eax
            //   c3                   | ret                 
            //   68????????           |                     
            //   e8????????           |                     

        $sequence_1 = { bf???????? e8???????? a3???????? 833d????????00 7409 833d????????00 7507 }
            // n = 7, score = 400
            //   bf????????           |                     
            //   e8????????           |                     
            //   a3????????           |                     
            //   833d????????00       |                     
            //   7409                 | je                  0xb
            //   833d????????00       |                     
            //   7507                 | jne                 9

        $sequence_2 = { c20c00 55 8bec 33c0 837d0801 721e 39450c }
            // n = 7, score = 400
            //   c20c00               | ret                 0xc
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   33c0                 | xor                 eax, eax
            //   837d0801             | cmp                 dword ptr [ebp + 8], 1
            //   721e                 | jb                  0x20
            //   39450c               | cmp                 dword ptr [ebp + 0xc], eax

        $sequence_3 = { eb48 a1???????? 53 57 054effffff 50 6a0c }
            // n = 7, score = 400
            //   eb48                 | jmp                 0x4a
            //   a1????????           |                     
            //   53                   | push                ebx
            //   57                   | push                edi
            //   054effffff           | add                 eax, 0xffffff4e
            //   50                   | push                eax
            //   6a0c                 | push                0xc

        $sequence_4 = { b88bff0000 663906 7504 8bc6 eb02 33c0 5f }
            // n = 7, score = 400
            //   b88bff0000           | mov                 eax, 0xff8b
            //   663906               | cmp                 word ptr [esi], ax
            //   7504                 | jne                 6
            //   8bc6                 | mov                 eax, esi
            //   eb02                 | jmp                 4
            //   33c0                 | xor                 eax, eax
            //   5f                   | pop                 edi

        $sequence_5 = { 56 53 8d85d8fdffff 50 e8???????? 8d45e0 50 }
            // n = 7, score = 400
            //   56                   | push                esi
            //   53                   | push                ebx
            //   8d85d8fdffff         | lea                 eax, [ebp - 0x228]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d45e0               | lea                 eax, [ebp - 0x20]
            //   50                   | push                eax

        $sequence_6 = { 56 8d8588feffff 50 e8???????? 397508 745d 8b4d08 }
            // n = 7, score = 400
            //   56                   | push                esi
            //   8d8588feffff         | lea                 eax, [ebp - 0x178]
            //   50                   | push                eax
            //   e8????????           |                     
            //   397508               | cmp                 dword ptr [ebp + 8], esi
            //   745d                 | je                  0x5f
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]

        $sequence_7 = { ff35???????? ff15???????? 85c0 7502 eb05 e9???????? ff75fc }
            // n = 7, score = 400
            //   ff35????????         |                     
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7502                 | jne                 4
            //   eb05                 | jmp                 7
            //   e9????????           |                     
            //   ff75fc               | push                dword ptr [ebp - 4]

        $sequence_8 = { e9???????? 837d0800 7426 837d0c00 7413 8b450c 0fb700 }
            // n = 7, score = 400
            //   e9????????           |                     
            //   837d0800             | cmp                 dword ptr [ebp + 8], 0
            //   7426                 | je                  0x28
            //   837d0c00             | cmp                 dword ptr [ebp + 0xc], 0
            //   7413                 | je                  0x15
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   0fb700               | movzx               eax, word ptr [eax]

        $sequence_9 = { 33f6 e8???????? 33d2 b978ff0000 f7f1 b9ff030000 83c237 }
            // n = 7, score = 400
            //   33f6                 | xor                 esi, esi
            //   e8????????           |                     
            //   33d2                 | xor                 edx, edx
            //   b978ff0000           | mov                 ecx, 0xff78
            //   f7f1                 | div                 ecx
            //   b9ff030000           | mov                 ecx, 0x3ff
            //   83c237               | add                 edx, 0x37

    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
}