rule win_kazuar_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 8b0402 4c01d8 eb07 48ffc3 }
            // n = 4, score = 300
            //   8b0402               | jne                 0xad
            //   4c01d8               | xor                 eax, eax
            //   eb07                 | jmp                 0x25
            //   48ffc3               | test                eax, eax

        $sequence_1 = { 5d 415c c3 4883ec48 e8???????? }
            // n = 5, score = 300
            //   5d                   | add                 esp, 0xc
            //   415c                 | mov                 eax, edi
            //   c3                   | pop                 ebx
            //   4883ec48             | dec                 eax
            //   e8????????           |                     

        $sequence_2 = { 31c0 4885c9 4989cb 89d7 7463 }
            // n = 5, score = 300
            //   31c0                 | je                  0x2dd
            //   4885c9               | mov                 eax, dword ptr [ebp - 0x24]
            //   4989cb               | mov                 dword ptr [ebx + 4], 0x1a0
            //   89d7                 | jmp                 0x330
            //   7463                 | mov                 eax, dword ptr [ebp - 0x24]

        $sequence_3 = { 8d8b00030000 894c2408 8d4b08 894c2404 }
            // n = 4, score = 300
            //   8d8b00030000         | mov                 dword ptr [esp + 8], edi
            //   894c2408             | mov                 dword ptr [esp], eax
            //   8d4b08               | call                ecx
            //   894c2404             | sub                 esp, 0x10

        $sequence_4 = { 7463 4863493c 4c01d9 8bb188000000 85f6 7452 }
            // n = 6, score = 300
            //   7463                 | inc                 ecx
            //   4863493c             | pop                 esp
            //   4c01d9               | ret                 
            //   8bb188000000         | dec                 eax
            //   85f6                 | sub                 esp, 0x48
            //   7452                 | xor                 edx, edx

        $sequence_5 = { 740a 81ea00204000 01d0 eb02 31c0 5d c3 }
            // n = 7, score = 300
            //   740a                 | mov                 dword ptr [ebx + 4], 0
            //   81ea00204000         | lea                 esp, [ebp - 0xc]
            //   01d0                 | pop                 ebx
            //   eb02                 | pop                 esi
            //   31c0                 | jmp                 0x3e3
            //   5d                   | mov                 dword ptr [ebx], 0
            //   c3                   | mov                 dword ptr [ebx + 4], 0

        $sequence_6 = { 41ffc1 4131c0 4569c097010001 ebdd }
            // n = 4, score = 300
            //   41ffc1               | mov                 eax, dword ptr [esi + 0x24]
            //   4131c0               | dec                 eax
            //   4569c097010001       | add                 ebx, ebx
            //   ebdd                 | cmp                 eax, dword ptr [ebp - 0x18]

        $sequence_7 = { 55 57 56 53 4883ec20 31c0 4885c9 }
            // n = 7, score = 300
            //   55                   | lea                 ecx, [ebx + 0x200]
            //   57                   | mov                 dword ptr [esp], eax
            //   56                   | mov                 dword ptr [esp + 0x10], ecx
            //   53                   | mov                 dword ptr [ebp - 0x14], 0
            //   4883ec20             | mov                 word ptr [ebp - 0x10], ax
            //   31c0                 | add                 eax, 2
            //   4885c9               | mov                 dword ptr [esp + 4], 0

        $sequence_8 = { 4863493c 4c01d9 8bb188000000 85f6 }
            // n = 4, score = 300
            //   4863493c             | imul                eax, eax, 0x1000197
            //   4c01d9               | jmp                 0x9a
            //   8bb188000000         | inc                 ecx
            //   85f6                 | call                edx

        $sequence_9 = { 8b10 894c2414 8d8b00020000 890424 894c2410 }
            // n = 5, score = 300
            //   8b10                 | add                 eax, dword ptr [ecx + esi*4]
            //   894c2414             | je                  0x1c4
            //   8d8b00020000         | je                  0x1d4
            //   890424               | mov                 ecx, dword ptr [ebp - 0x14]
            //   894c2410             | mov                 eax, ebx

    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
}