rule win_bhunt_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.bhunt."
        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.bhunt"
        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 = { 59 eb0a 68???????? e8???????? 59 8b742430 ff442418 }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   eb0a                 | jmp                 0xc
            //   68????????           |                     
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8b742430             | mov                 esi, dword ptr [esp + 0x30]
            //   ff442418             | inc                 dword ptr [esp + 0x18]

        $sequence_1 = { 50 81c768030000 57 e8???????? c745f001000000 83c40c 8b7dfc }
            // n = 7, score = 100
            //   50                   | push                eax
            //   81c768030000         | add                 edi, 0x368
            //   57                   | push                edi
            //   e8????????           |                     
            //   c745f001000000       | mov                 dword ptr [ebp - 0x10], 1
            //   83c40c               | add                 esp, 0xc
            //   8b7dfc               | mov                 edi, dword ptr [ebp - 4]

        $sequence_2 = { ff73f4 8bc6 ff30 e8???????? 59 59 8b43e4 }
            // n = 7, score = 100
            //   ff73f4               | push                dword ptr [ebx - 0xc]
            //   8bc6                 | mov                 eax, esi
            //   ff30                 | push                dword ptr [eax]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   8b43e4               | mov                 eax, dword ptr [ebx - 0x1c]

        $sequence_3 = { 63e2 4d 0fbfd8 50 6641 ffc5 4c }
            // n = 7, score = 100
            //   63e2                 | arpl                dx, sp
            //   4d                   | dec                 ebp
            //   0fbfd8               | movsx               ebx, ax
            //   50                   | push                eax
            //   6641                 | inc                 cx
            //   ffc5                 | inc                 ebp
            //   4c                   | dec                 esp

        $sequence_4 = { 8945c8 8b4308 8945cc 68???????? eb0c 68???????? eb05 }
            // n = 7, score = 100
            //   8945c8               | mov                 dword ptr [ebp - 0x38], eax
            //   8b4308               | mov                 eax, dword ptr [ebx + 8]
            //   8945cc               | mov                 dword ptr [ebp - 0x34], eax
            //   68????????           |                     
            //   eb0c                 | jmp                 0xe
            //   68????????           |                     
            //   eb05                 | jmp                 7

        $sequence_5 = { 57 9d 43 b4a2 99 0bdd 4b }
            // n = 7, score = 100
            //   57                   | push                edi
            //   9d                   | popfd               
            //   43                   | inc                 ebx
            //   b4a2                 | mov                 ah, 0xa2
            //   99                   | cdq                 
            //   0bdd                 | or                  ebx, ebp
            //   4b                   | dec                 ebx

        $sequence_6 = { 81ef04000000 8b07 33c3 f9 f8 2d1f6f2761 f9 }
            // n = 7, score = 100
            //   81ef04000000         | sub                 edi, 4
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   33c3                 | xor                 eax, ebx
            //   f9                   | stc                 
            //   f8                   | clc                 
            //   2d1f6f2761           | sub                 eax, 0x61276f1f
            //   f9                   | stc                 

        $sequence_7 = { ff7304 ff75fc e8???????? e9???????? 8b7dfc e8???????? 85c0 }
            // n = 7, score = 100
            //   ff7304               | push                dword ptr [ebx + 4]
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   e8????????           |                     
            //   e9????????           |                     
            //   8b7dfc               | mov                 edi, dword ptr [ebp - 4]
            //   e8????????           |                     
            //   85c0                 | test                eax, eax

        $sequence_8 = { ff73e4 eb0f 0fb643b4 50 ff73e4 6a00 }
            // n = 6, score = 100
            //   ff73e4               | push                dword ptr [ebx - 0x1c]
            //   eb0f                 | jmp                 0x11
            //   0fb643b4             | movzx               eax, byte ptr [ebx - 0x4c]
            //   50                   | push                eax
            //   ff73e4               | push                dword ptr [ebx - 0x1c]
            //   6a00                 | push                0

        $sequence_9 = { 8b86f3c0ac70 26100a d804d4 f8 a6 3f 13f1 }
            // n = 7, score = 100
            //   8b86f3c0ac70         | mov                 eax, dword ptr [esi + 0x70acc0f3]
            //   26100a               | adc                 byte ptr es:[edx], cl
            //   d804d4               | fadd                dword ptr [esp + edx*8]
            //   f8                   | clc                 
            //   a6                   | cmpsb               byte ptr [esi], byte ptr es:[edi]
            //   3f                   | aas                 
            //   13f1                 | adc                 esi, ecx

    condition:
        7 of them and filesize < 19161088
}

import "pe"

rule win_bhunt_w0 {
    meta:
        description = "Detects BHunt Malware Infostealer"
        author = "BlackBerry Research & Intelligence Team"
        date = "Jan 28th 2022"
        license = "This Yara rule is provided under the Apache License 2.0 (https://www.apache.org/licenses/LICENSE-2.0) and open to any user or organization, as long as you use it under this license and ensure originator credit in any derivative to The BlackBerry Research & Intelligence Team"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.bhunt"
        malpedia_version = "20220220"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
        malpedia_rule_date = "20220220"
        malpedia_hash = ""
        
    strings:
        // C2
        $s1 = "http://minecraftsquid.hopto.org/ifo.php" wide
        // Name of assembly in metadata
        $s2 = "BHUNT" wide
        // Outlook misspelled in reg key
        $s3 = "Outllook" wide

    condition:
        // MZ Header
        uint16(0) == 0x5a4d and
        // is a .NET binary
        pe.data_directories[pe.IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR].size != 0 and
        all of ($s*)
}