rule win_kazuar_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-01-05"
        version = "1"
        description = "Detects win.kazuar."
        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.kazuar"
        malpedia_rule_date = "20260105"
        malpedia_hash = "19b79e7cab4eaf532122e5b45a77dd8f6bb5cc79"
        malpedia_version = "20251219"
        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 = { 7452 83b98c00000000 7449 4c01de 31db 8b6e20 448b6618 }
            // n = 7, score = 300
            //   7452                 | sub                 esp, 0x10
            //   83b98c00000000       | test                eax, eax
            //   7449                 | jns                 0x135e
            //   4c01de               | mov                 dword ptr [ebx], eax
            //   31db                 | mov                 dword ptr [ebx + 4], 0x195
            //   8b6e20               | call                ecx
            //   448b6618             | sub                 esp, 0x10

        $sequence_1 = { 83c002 c744240400000000 668945f2 8d45ec c7042400000000 8944240c 8d45f0 }
            // n = 7, score = 300
            //   83c002               | dec                 eax
            //   c744240400000000     | mov                 ecx, ebx
            //   668945f2             | dec                 eax
            //   8d45ec               | test                eax, eax
            //   c7042400000000       | je                  0xfffffffa
            //   8944240c             | dec                 eax
            //   8d45f0               | lea                 edx, [0xf55]

        $sequence_2 = { e8???????? 89c3 e8???????? 01c0 895df4 }
            // n = 5, score = 300
            //   e8????????           |                     
            //   89c3                 | lea                 ecx, [ebx + 8]
            //   e8????????           |                     
            //   01c0                 | mov                 dword ptr [esp + 4], ecx
            //   895df4               | mov                 dword ptr [esp + 0x10], ecx

        $sequence_3 = { 31c0 4885c9 4989cb 89d7 7463 4863493c }
            // n = 6, score = 300
            //   31c0                 | jmp                 0x5d
            //   4885c9               | mov                 eax, dword ptr [esi + 0x24]
            //   4989cb               | dec                 eax
            //   89d7                 | add                 ebx, ebx
            //   7463                 | dec                 esp
            //   4863493c             | add                 ebx, ebx

        $sequence_4 = { 8b0402 4c01d8 eb07 48ffc3 ebc8 31c0 }
            // n = 6, score = 300
            //   8b0402               | inc                 ecx
            //   4c01d8               | mov                 eax, 0x104
            //   eb07                 | dec                 eax
            //   48ffc3               | lea                 ebx, [esp + 0x2c]
            //   ebc8                 | dec                 eax
            //   31c0                 | mov                 edx, ebx

        $sequence_5 = { 8d8b00030000 894c2408 8d4b08 894c2404 ff522c 83ec18 }
            // n = 6, score = 300
            //   8d8b00030000         | dec                 eax
            //   894c2408             | mov                 ecx, ebx
            //   8d4b08               | mov                 dl, 1
            //   894c2404             | mov                 al, dl
            //   ff522c               | dec                 eax
            //   83ec18               | add                 esp, 0x130

        $sequence_6 = { 6685c9 7417 e8???????? 0fb7c0 41ffc1 }
            // n = 5, score = 300
            //   6685c9               | dec                 eax
            //   7417                 | add                 esp, 0x48
            //   e8????????           |                     
            //   0fb7c0               | ret                 
            //   41ffc1               | dec                 eax

        $sequence_7 = { 31c0 4885db 7428 4989db 498b4b40 e8???????? 3d88ae6393 }
            // n = 7, score = 300
            //   31c0                 | sub                 esp, 0xc
            //   4885db               | test                eax, eax
            //   7428                 | jns                 0xdb4
            //   4989db               | mov                 dword ptr [ebx], eax
            //   498b4b40             | mov                 dword ptr [esp + 8], edx
            //   e8????????           |                     
            //   3d88ae6393           | call                ecx

        $sequence_8 = { 7425 e8???????? 39f8 751c 8b4624 4801db }
            // n = 6, score = 300
            //   7425                 | xor                 esi, esi
            //   e8????????           |                     
            //   39f8                 | push                ebx
            //   751c                 | mov                 ebx, eax
            //   8b4624               | add                 ebx, 2
            //   4801db               | movzx               eax, word ptr [ebx - 2]

        $sequence_9 = { 8d8b00030000 894c2408 8d4b08 894c2404 ff522c }
            // n = 5, score = 300
            //   8d8b00030000         | mov                 ebx, dword ptr [eax + 0x3c]
            //   894c2408             | xor                 edi, edi
            //   8d4b08               | sub                 esp, 0xc
            //   894c2404             | test                eax, eax
            //   ff522c               | jns                 0x2e2

    condition:
        7 of them and filesize < 81920
}

import "pe"

rule win_kazuar_w0 {

    meta:
        author = "Dominik Reichel"
        description = "Detects Turla's KERNEL, WORKER and BRIDGE Kazuar v3"
        date = "2026-01-12"
        reference = "https://r136a1.dev/2026/01/14/command-and-evade-turlas-kazuar-v3-loader/"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.kazuar"
        malpedia_rule_date = "20260112"
        malpedia_hash = ""
        malpedia_version = "20260112"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    strings:
        $a0 = "FxResources.System.Buffers"
        $a1 = "FxResources.System.Numerics.Vectors"
        $a2 = "Google.Protobuf.Reflection"
        $a3 = "Google.Protobuf.WellKnownTypes"
        $a4 = "Microsoft.CodeAnalysis"
        $a5 = "System.Diagnostics.CodeAnalysis"
        $a6 = "System.Runtime.InteropServices"

        $b0 = "RequestElection"
        $b1 = "LeaderShutdown"
        $b2 = "ClientAnnouncement"
        $b3 = "LeaderAnnouncement"
        $b4 = "Silence"

        $c0 = "ExchangeWebServices"
        $c1 = "WebSocket"
        $c2 = "HTTP"

        $d0 = "AUTOS"
        $d1 = "GET_CONFIG"
        $d2 = "PEEP"
        $d3 = "CHECK"
        $d4 = "KEYLOG"
        $d5 = "SYN"
        $d6 = "TASK_RESULT"
        $d7 = "CHECK_RESULT"
        $d8 = "CONFIG"
        $d9 = "SEND"
        $d10 = "TASK_KILL"
        $d11 = "SEND_RESULT"
        $d12 = "TASK"

    condition:
        uint16(0) == 0x5A4D and
        uint32(uint32(0x3C)) == 0x00004550 and
        pe.imports("mscoree.dll", "_CorExeMain") and
        (
            (
                4 of ($a*) and
                2 of ($b*)
            ) or
            (
                5 of ($a*) and
                all of ($c*)
            ) or
            (
                5 of ($a*) and
                9 of ($d*)
            ) or
            (
                2 of ($b*) and
                2 of ($c*)
            ) or
            (
                2 of ($b*) and
                6 of ($d*)
            ) or
            (
                all of ($b*)
            ) or
            (
                10 of ($d*)
            )
        )
}

import "pe"

rule win_kazuar_w1 {

    meta:
        author = "Dominik Reichel"
        description = "Detects Turla's Kazuar v3 native loader"
        date = "2026-01-12"
        reference = "https://r136a1.dev/2026/01/14/command-and-evade-turlas-kazuar-v3-loader/"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.kazuar"
        malpedia_rule_date = "20260112"
        malpedia_hash = ""
        malpedia_version = "20260112"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    strings:
        $a0 = "%d:%08X"
        $a1 = "Software\\Classes\\" wide
        
        $b0 = {7B 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 2D 00 ?? 00 ?? 00 ?? 00 ?? 00 2D 00 ?? 00 ?? 00 ?? 00 ?? 00 2D 00 ?? 00 ?? 00 ?? 00 ?? 00 2D 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 ?? 00 00 00}

    condition:
        uint16(0) == 0x5A4D and
        uint32(uint32(0x3C)) == 0x00004550 and
        all of ($a*) and
        #b0 >= 3 and 
        pe.imports("dbghelp.dll", "SymInitialize") and
        pe.imports("dbghelp.dll", "SymCleanup") and
        pe.imports("oleaut32.dll", "SafeArrayAccessData") and
        pe.imports("oleaut32.dll", "SafeArrayUnaccessData") and
        pe.imports("ole32.dll", "StringFromCLSID") and
        pe.imports("ole32.dll", "CLSIDFromProgID") and
        pe.imports("ole32.dll", "CLSIDFromString") and
        pe.imports("ole32.dll", "CoUninitialize")
}

import "pe"

rule win_kazuar_w2 {

    meta:
        author = "Dominik Reichel"
        description = "Detects Turla's Kazuar v3 COM-visible application"
        date = "2026-01-12"
        reference = "https://r136a1.dev/2026/01/14/command-and-evade-turlas-kazuar-v3-loader/"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.kazuar"
        malpedia_rule_date = "20260112"
        malpedia_hash = ""
        malpedia_version = "20260112"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    strings:
        $a0 = "GetDelegateForFunctionPointer"
        $a1 = "StackFrame"
        $a2 = "GuidAttribute"
        $a3 = "ComVisibleAttribute"
        $a4 = "ClassInterfaceAttribute"
        $a5 = "UnmanagedFunctionPointerAttribute"
        $a6 = "CompilerGeneratedAttribute"
        $a7 = "System.Reflection"
        $a8 = "CallingConvention"
        $a9 = "TargetInvocationException"
        $a10 = "get_InnerException"

        $b0 = "ResourceManager"

    condition:
        uint16(0) == 0x5A4D and
        uint32(uint32(0x3C)) == 0x00004550 and
        pe.imports("mscoree.dll", "_CorDllMain") and
        all of ($a*) and
        filesize < 100KB and not
        $b0
}