rule win_winnti_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.winnti."
        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.winnti"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 50 c744241414000000 c744241800000000 c744241c01000000 }
            // n = 4, score = 200
            //   50                   | push                eax
            //   c744241414000000     | mov                 dword ptr [esp + 0x14], 0x14
            //   c744241800000000     | mov                 dword ptr [esp + 0x18], 0
            //   c744241c01000000     | mov                 dword ptr [esp + 0x1c], 1

        $sequence_1 = { 6a04 50 6800042200 55 }
            // n = 4, score = 200
            //   6a04                 | push                4
            //   50                   | push                eax
            //   6800042200           | push                0x220400
            //   55                   | push                ebp

        $sequence_2 = { 33c0 8d7c2474 f3ab 8d542474 }
            // n = 4, score = 200
            //   33c0                 | xor                 eax, eax
            //   8d7c2474             | lea                 edi, [esp + 0x74]
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   8d542474             | lea                 edx, [esp + 0x74]

        $sequence_3 = { 0f848a000000 be???????? 8bc5 8a10 }
            // n = 4, score = 200
            //   0f848a000000         | je                  0x90
            //   be????????           |                     
            //   8bc5                 | mov                 eax, ebp
            //   8a10                 | mov                 dl, byte ptr [eax]

        $sequence_4 = { 5e 5d 5b 81c430100000 c3 c7463c01000000 897e40 }
            // n = 7, score = 200
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   5b                   | pop                 ebx
            //   81c430100000         | add                 esp, 0x1030
            //   c3                   | ret                 
            //   c7463c01000000       | mov                 dword ptr [esi + 0x3c], 1
            //   897e40               | mov                 dword ptr [esi + 0x40], edi

        $sequence_5 = { 85c0 7e11 8b4e2c 85c9 }
            // n = 4, score = 200
            //   85c0                 | test                eax, eax
            //   7e11                 | jle                 0x13
            //   8b4e2c               | mov                 ecx, dword ptr [esi + 0x2c]
            //   85c9                 | test                ecx, ecx

        $sequence_6 = { 8bd9 55 56 57 8b4b44 8b5348 }
            // n = 6, score = 200
            //   8bd9                 | mov                 ebx, ecx
            //   55                   | push                ebp
            //   56                   | push                esi
            //   57                   | push                edi
            //   8b4b44               | mov                 ecx, dword ptr [ebx + 0x44]
            //   8b5348               | mov                 edx, dword ptr [ebx + 0x48]

        $sequence_7 = { f2ae f7d1 2bf9 8b6c2418 8bc1 }
            // n = 5, score = 200
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   f7d1                 | not                 ecx
            //   2bf9                 | sub                 edi, ecx
            //   8b6c2418             | mov                 ebp, dword ptr [esp + 0x18]
            //   8bc1                 | mov                 eax, ecx

        $sequence_8 = { 7409 4885c0 0f8564010000 488d8200100000 }
            // n = 4, score = 100
            //   7409                 | je                  0xb
            //   4885c0               | dec                 eax
            //   0f8564010000         | test                eax, eax
            //   488d8200100000       | jne                 0x16a

        $sequence_9 = { 488bd8 488d05d03b0100 4885db 488d4f38 480f44d8 }
            // n = 5, score = 100
            //   488bd8               | lea                 eax, [ebp + 0x67]
            //   488d05d03b0100       | dec                 eax
            //   4885db               | mov                 dword ptr [esp + 0x30], eax
            //   488d4f38             | dec                 eax
            //   480f44d8             | lea                 eax, [ebp - 0x69]

        $sequence_10 = { 813f10126119 0f8511010000 8b4708 85c0 }
            // n = 4, score = 100
            //   813f10126119         | cmp                 dword ptr [edi], 0x19611210
            //   0f8511010000         | jne                 0x117
            //   8b4708               | mov                 eax, dword ptr [edi + 8]
            //   85c0                 | test                eax, eax

        $sequence_11 = { 85c0 751c 0fb60437 84c0 }
            // n = 4, score = 100
            //   85c0                 | cmp                 dword ptr [edi + 8], 0x62697264
            //   751c                 | jne                 0x17
            //   0fb60437             | dec                 eax
            //   84c0                 | mov                 esi, dword ptr [esp + 0x30]

        $sequence_12 = { 488d4567 4889442430 488d4597 4c8d4597 41b930000000 ba04822200 }
            // n = 6, score = 100
            //   488d4567             | inc                 ebp
            //   4889442430           | xor                 eax, eax
            //   488d4597             | dec                 eax
            //   4c8d4597             | lea                 ecx, [eax + 8]
            //   41b930000000         | mov                 dword ptr [eax], 0x19601110
            //   ba04822200           | inc                 ecx

        $sequence_13 = { 33f6 89742420 486312 8b4804 8d7e0f }
            // n = 5, score = 100
            //   33f6                 | pop                 ebx
            //   89742420             | dec                 eax
            //   486312               | mov                 ebx, eax
            //   8b4804               | dec                 eax
            //   8d7e0f               | lea                 eax, [0x13bd0]

        $sequence_14 = { 803800 741d 4c8d0dfffa0000 41b802000000 488bd7 488bce }
            // n = 6, score = 100
            //   803800               | dec                 esp
            //   741d                 | lea                 eax, [ebp - 0x69]
            //   4c8d0dfffa0000       | inc                 ecx
            //   41b802000000         | mov                 ecx, 0x30
            //   488bd7               | mov                 edx, 0x228204
            //   488bce               | dec                 eax

        $sequence_15 = { 488d0d70930a00 488b0cc1 488b442460 4c8d4c2448 488b0c08 }
            // n = 5, score = 100
            //   488d0d70930a00       | dec                 eax
            //   488b0cc1             | cmove               ebx, eax
            //   488b442460           | cmp                 byte ptr [eax], 0
            //   4c8d4c2448           | je                  0x22
            //   488b0c08             | dec                 esp

        $sequence_16 = { 4963c2 4c8bc0 49c1f810 0fb7f8 48c1e705 4a8b04c1 44894c3810 }
            // n = 7, score = 100
            //   4963c2               | and                 eax, ecx
            //   4c8bc0               | dec                 eax
            //   49c1f810             | cmp                 eax, ecx
            //   0fb7f8               | je                  0xe
            //   48c1e705             | dec                 eax
            //   4a8b04c1             | test                eax, eax
            //   44894c3810           | jne                 0x131

        $sequence_17 = { 894704 e9???????? 488d0d55db0a00 48394c2458 7427 488b543b58 }
            // n = 6, score = 100
            //   894704               | dec                 eax
            //   e9????????           |                     
            //   488d0d55db0a00       | mov                 edi, dword ptr [esp + 0x38]
            //   48394c2458           | mov                 eax, 0xffffffbd
            //   7427                 | dec                 eax
            //   488b543b58           | add                 esp, 0x20

        $sequence_18 = { 4c8bce 4c8bc3 480f44d1 488bcb ff15???????? }
            // n = 5, score = 100
            //   4c8bce               | dec                 eax
            //   4c8bc3               | mov                 edx, dword ptr [edi + 0x18]
            //   480f44d1             | dec                 eax
            //   488bcb               | mov                 ecx, edi
            //   ff15????????         |                     

        $sequence_19 = { 4c8b4720 488b5718 488bcf ffd0 }
            // n = 4, score = 100
            //   4c8b4720             | dec                 eax
            //   488b5718             | lea                 eax, [edx + 0x1000]
            //   488bcf               | dec                 esp
            //   ffd0                 | mov                 eax, dword ptr [edi + 0x20]

        $sequence_20 = { 488bd8 7427 4533c0 488d4808 c70010116019 418d5001 }
            // n = 6, score = 100
            //   488bd8               | call                eax
            //   7427                 | dec                 esp
            //   4533c0               | mov                 ecx, esi
            //   488d4808             | dec                 esp
            //   c70010116019         | mov                 eax, ebx
            //   418d5001             | dec                 eax

        $sequence_21 = { 8944242c e9???????? 83ff22 751d 0fbae308 }
            // n = 5, score = 100
            //   8944242c             | dec                 eax
            //   e9????????           |                     
            //   83ff22               | test                ebx, ebx
            //   751d                 | dec                 eax
            //   0fbae308             | lea                 ecx, [edi + 0x38]

        $sequence_22 = { 4823c1 483bc1 7409 4885c0 0f8523010000 817f0864726962 }
            // n = 6, score = 100
            //   4823c1               | lea                 edx, [eax + 1]
            //   483bc1               | mov                 ecx, 0x3c
            //   7409                 | dec                 esp
            //   4885c0               | mov                 eax, edx
            //   0f8523010000         | inc                 esp
            //   817f0864726962       | lea                 ecx, [ecx - 0x2c]

        $sequence_23 = { b93c000000 4c8bc2 448d49d4 666666660f1f840000000000 488bc6 48d3e8 }
            // n = 6, score = 100
            //   b93c000000           | cmove               edx, ecx
            //   4c8bc2               | dec                 eax
            //   448d49d4             | mov                 ecx, ebx
            //   666666660f1f840000000000     | dec    eax
            //   488bc6               | mov                 ebx, eax
            //   48d3e8               | je                  0x29

    condition:
        7 of them and filesize < 1581056
}

rule win_winnti_w0 {
    meta:
        author = "BR Data"
        source = "https://github.com/br-data/2019-winnti-analyse/"
        date = "2019-07-24"
        description = "rules used for retrohunting by BR Data."
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.winnti"
        malpedia_version = "20190822"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    strings:
        $load_magic = { C7 44 ?? ?? FF D8 FF E0 }
        $iter = { E9 EA EB EC ED EE EF F0 }
        $jpeg = { FF D8 FF E0 00 00 00 00 00 00 }

    condition:
        uint16(0) == 0x5a4d and
        $jpeg and
        ($load_magic or $iter in (@jpeg[1]..@jpeg[1]+200)) and
        for any i in (1..#jpeg): ( uint8(@jpeg[i] + 11) != 0 )
}

rule win_winnti_w1 {
    meta:
        author = "BR Data"
        source = "https://github.com/br-data/2019-winnti-analyse/"
        date = "2019-07-24"
        description = "rules used for retrohunting by BR Data."
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.winnti"
        malpedia_version = "20190822"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
    strings:
        $cooper = "Cooper"
        $pattern = { e9 ea eb ec ed ee ef f0}
    condition:
        uint16(0) == 0x5a4d and $cooper and ($pattern in (@cooper[1]..@cooper[1]+100))
}

rule win_winnti_w2 {
    meta:
        author = "Bundesamt fuer Verfassungsschutz"
        source = "https://www.verfassungsschutz.de/download/anlage-2019-12-bfv-cyber-brief-2019-01.txt"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.winnti"
        malpedia_version = "20191207"
        malpedia_sharing = "TLP:WHITE"
        malpedia_license = ""
    strings:
        $e1 = "Global\\BFE_Notify_Event_{65a097fe-6102-446a-9f9c-55dfc3f411015}" ascii nocase
        $e2 = "Global\\BFE_Notify_Event_{65a097fe-6102-446a-9f9c-55dfc3f411014}" ascii nocase
        $e3 = "Global\\BFE_Notify_Event_{65a097fe-6102-446a-9f9c-55dfc3f411016}" ascii nocase
        $e4 = "\\BaseNamedObjects\\{B2B87CCA-66BC-4C24-89B2-C23C9EAC2A66}" wide
        $e5 = "BFE_Notify_Event_{7D00FA3C-FBDC-4A8D-AEEB-3F55A4890D2A}" nocase
    condition:
        (any of ($e*))
}

rule win_winnti_w3 {
    meta:
        author = "Bundesamt fuer Verfassungsschutz"
        source = "https://www.verfassungsschutz.de/download/anlage-2019-12-bfv-cyber-brief-2019-01.txt"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.winnti"
        malpedia_version = "20191207"
        malpedia_sharing = "TLP:WHITE"
        malpedia_license = ""
    strings:
        $a1 = "IPSecMiniPort" wide fullword
        $a2 = "ndis6fw" wide fullword
        $a3 = "TCPIP" wide fullword
        $a4 = "NDIS.SYS" ascii fullword
        $a5 = "ntoskrnl.exe" ascii fullword
        $a6 = "\\BaseNamedObjects\\{B2B87CCA-66BC-4C24-89B2-C23C9EAC2A66}" wide
        $a7 = "\\Device\\Null" wide
        $a8 = "\\Device" wide
        $a9 = "\\Driver" wide
        $b1 = { 66 81 7? ?? 70 17 }
        $b2 = { 81 7? ?? 07 E0 15 00 }
        $b3 = { 8B 46 18 3D 03 60 15 00 }
    condition:
        (6 of ($a*)) and (2 of ($b*))
}