rule win_bhunt_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-12-06"
        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 = "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 = { feca f8 d0c2 f5 f8 32da 80ffd4 }
            // n = 7, score = 100
            //   feca                 | dec                 dl
            //   f8                   | clc                 
            //   d0c2                 | rol                 dl, 1
            //   f5                   | cmc                 
            //   f8                   | clc                 
            //   32da                 | xor                 bl, dl
            //   80ffd4               | cmp                 bh, 0xd4

        $sequence_1 = { 85c0 751a 8b442410 50 8bd5 8bc3 e8???????? }
            // n = 7, score = 100
            //   85c0                 | test                eax, eax
            //   751a                 | jne                 0x1c
            //   8b442410             | mov                 eax, dword ptr [esp + 0x10]
            //   50                   | push                eax
            //   8bd5                 | mov                 edx, ebp
            //   8bc3                 | mov                 eax, ebx
            //   e8????????           |                     

        $sequence_2 = { 8902 660fbcc0 8b07 8dbf04000000 663bcf 66f7c4ab75 33c3 }
            // n = 7, score = 100
            //   8902                 | mov                 dword ptr [edx], eax
            //   660fbcc0             | bsf                 ax, ax
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   8dbf04000000         | lea                 edi, [edi + 4]
            //   663bcf               | cmp                 cx, di
            //   66f7c4ab75           | test                sp, 0x75ab
            //   33c3                 | xor                 eax, ebx

        $sequence_3 = { bbff000000 8bc3 8d7c2414 66c784241e1200000800 e8???????? 59 8d8600120000 }
            // n = 7, score = 100
            //   bbff000000           | mov                 ebx, 0xff
            //   8bc3                 | mov                 eax, ebx
            //   8d7c2414             | lea                 edi, [esp + 0x14]
            //   66c784241e1200000800     | mov    word ptr [esp + 0x121e], 8
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8d8600120000         | lea                 eax, [esi + 0x1200]

        $sequence_4 = { 0fb7c2 8b55f0 03450c 2bd1 0fb74dfc }
            // n = 5, score = 100
            //   0fb7c2               | movzx               eax, dx
            //   8b55f0               | mov                 edx, dword ptr [ebp - 0x10]
            //   03450c               | add                 eax, dword ptr [ebp + 0xc]
            //   2bd1                 | sub                 edx, ecx
            //   0fb74dfc             | movzx               ecx, word ptr [ebp - 4]

        $sequence_5 = { ff7304 c645d405 56 e8???????? ff7304 ff36 e8???????? }
            // n = 7, score = 100
            //   ff7304               | push                dword ptr [ebx + 4]
            //   c645d405             | mov                 byte ptr [ebp - 0x2c], 5
            //   56                   | push                esi
            //   e8????????           |                     
            //   ff7304               | push                dword ptr [ebx + 4]
            //   ff36                 | push                dword ptr [esi]
            //   e8????????           |                     

        $sequence_6 = { 83a530ffffff00 c7852cffffff01000000 ffb530ffffff ffb52cffffff 52 ffb544ffffff e8???????? }
            // n = 7, score = 100
            //   83a530ffffff00       | and                 dword ptr [ebp - 0xd0], 0
            //   c7852cffffff01000000     | mov    dword ptr [ebp - 0xd4], 1
            //   ffb530ffffff         | push                dword ptr [ebp - 0xd0]
            //   ffb52cffffff         | push                dword ptr [ebp - 0xd4]
            //   52                   | push                edx
            //   ffb544ffffff         | push                dword ptr [ebp - 0xbc]
            //   e8????????           |                     

        $sequence_7 = { 5f 9c 04f8 26ed c59818579fa0 5f e7e6 }
            // n = 7, score = 100
            //   5f                   | pop                 edi
            //   9c                   | pushfd              
            //   04f8                 | add                 al, 0xf8
            //   26ed                 | in                  eax, dx
            //   c59818579fa0         | lds                 ebx, ptr [eax - 0x5f60a8e8]
            //   5f                   | pop                 edi
            //   e7e6                 | out                 0xe6, eax

        $sequence_8 = { 52 3a21 a7 a2???????? 50 9d 03890023b0b3 }
            // n = 7, score = 100
            //   52                   | push                edx
            //   3a21                 | cmp                 ah, byte ptr [ecx]
            //   a7                   | cmpsd               dword ptr [esi], dword ptr es:[edi]
            //   a2????????           |                     
            //   50                   | push                eax
            //   9d                   | popfd               
            //   03890023b0b3         | add                 ecx, dword ptr [ecx - 0x4c4fdd00]

        $sequence_9 = { ac 2a7279 bfae9603f7 6c a3???????? 9f 97 }
            // n = 7, score = 100
            //   ac                   | lodsb               al, byte ptr [esi]
            //   2a7279               | sub                 dh, byte ptr [edx + 0x79]
            //   bfae9603f7           | mov                 edi, 0xf70396ae
            //   6c                   | insb                byte ptr es:[edi], dx
            //   a3????????           |                     
            //   9f                   | lahf                
            //   97                   | xchg                eax, edi

    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*)
}