BetaBot (Malware Family)

BetaBot

aka: Neurevt

VTCollection URLhaus

Cybereason concludes that Betabot is a sophisticated infostealer malware that’s evolved significantly since it first appeared in late 2012. The malware began as a banking Trojan and is now packed with features that allow its operators to practically take over a victim’s machine and steal sensitive information.

References

2020-07-14 ⋅ SophosLabs Uncut ⋅ Markel Picado, Sean Gallagher
RATicate upgrades “RATs as a Service” attacks with commercial “crypter”
LokiBot BetaBot CloudEyE NetWire RC

Yara Rules

[TLP:WHITE] win_betabot_auto (20260504 | Detects win.betabot.)

rule win_betabot_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 56 bb90000000 53 50 e8???????? a1???????? }
            // n = 6, score = 400
            //   56                   | push                esi
            //   bb90000000           | mov                 ebx, 0x90
            //   53                   | push                ebx
            //   50                   | push                eax
            //   e8????????           |                     
            //   a1????????           |                     

        $sequence_1 = { 8365e800 8365fc00 8365e400 8365ec00 8365f800 }
            // n = 5, score = 400
            //   8365e800             | and                 dword ptr [ebp - 0x18], 0
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   8365e400             | and                 dword ptr [ebp - 0x1c], 0
            //   8365ec00             | and                 dword ptr [ebp - 0x14], 0
            //   8365f800             | and                 dword ptr [ebp - 8], 0

        $sequence_2 = { 8b461c 8945f8 58 5e 56 50 8b7508 }
            // n = 7, score = 400
            //   8b461c               | mov                 eax, dword ptr [esi + 0x1c]
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   58                   | pop                 eax
            //   5e                   | pop                 esi
            //   56                   | push                esi
            //   50                   | push                eax
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]

        $sequence_3 = { 56 e8???????? 8935???????? 8bc6 5e c9 c3 }
            // n = 7, score = 400
            //   56                   | push                esi
            //   e8????????           |                     
            //   8935????????         |                     
            //   8bc6                 | mov                 eax, esi
            //   5e                   | pop                 esi
            //   c9                   | leave               
            //   c3                   | ret                 

        $sequence_4 = { ff7508 a4 895dfc ff15???????? 8bf0 83feff }
            // n = 6, score = 400
            //   ff7508               | push                dword ptr [ebp + 8]
            //   a4                   | movsb               byte ptr es:[edi], byte ptr [esi]
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   83feff               | cmp                 esi, -1

        $sequence_5 = { ff15???????? 85c0 740b 43 83c628 83fb0c 72e7 }
            // n = 7, score = 400
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   740b                 | je                  0xd
            //   43                   | inc                 ebx
            //   83c628               | add                 esi, 0x28
            //   83fb0c               | cmp                 ebx, 0xc
            //   72e7                 | jb                  0xffffffe9

        $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 = { 50 33ff 56 47 56 895df8 }
            // n = 6, score = 400
            //   50                   | push                eax
            //   33ff                 | xor                 edi, edi
            //   56                   | push                esi
            //   47                   | inc                 edi
            //   56                   | push                esi
            //   895df8               | mov                 dword ptr [ebp - 8], ebx

        $sequence_8 = { 8985e4feffff eb11 8b85e4feffff 2de8030000 8985e4feffff 6a18 e8???????? }
            // n = 7, score = 400
            //   8985e4feffff         | mov                 dword ptr [ebp - 0x11c], eax
            //   eb11                 | jmp                 0x13
            //   8b85e4feffff         | mov                 eax, dword ptr [ebp - 0x11c]
            //   2de8030000           | sub                 eax, 0x3e8
            //   8985e4feffff         | mov                 dword ptr [ebp - 0x11c], eax
            //   6a18                 | push                0x18
            //   e8????????           |                     

        $sequence_9 = { 743e 6880000000 50 8d4580 50 e8???????? 8b450c }
            // n = 7, score = 400
            //   743e                 | je                  0x40
            //   6880000000           | push                0x80
            //   50                   | push                eax
            //   8d4580               | lea                 eax, [ebp - 0x80]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]

    condition:
        7 of them and filesize < 835584
}

[TLP:WHITE] win_betabot_w0 (20170517 | Neurevt Malware Sig)

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
}

Download all Yara Rules

BetaBot Propose Change

References

Yara Rules

BetaBot