rule win_citadel_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-05-30"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.citadel"
        malpedia_rule_date = "20200529"
        malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8"
        malpedia_version = "20200529"
        malpedia_license = "CC BY-NC-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 / approach 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 = { eb0e 6800800000 53 57 }
            // n = 4, score = 4900
            //   eb0e                 | jmp                 0x10
            //   6800800000           | push                0x8000
            //   53                   | push                ebx
            //   57                   | push                edi

        $sequence_1 = { 8bd0 85d2 741b 8b4d08 }
            // n = 4, score = 4800
            //   8bd0                 | mov                 edx, eax
            //   85d2                 | test                edx, edx
            //   741b                 | je                  0x1d
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]

        $sequence_2 = { ff750c e8???????? 8845ff e8???????? 8a45ff }
            // n = 5, score = 4800
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   e8????????           |                     
            //   8845ff               | mov                 byte ptr [ebp - 1], al
            //   e8????????           |                     
            //   8a45ff               | mov                 al, byte ptr [ebp - 1]

        $sequence_3 = { 50 e8???????? 6a44 5a }
            // n = 4, score = 4800
            //   50                   | push                eax
            //   e8????????           |                     
            //   6a44                 | push                0x44
            //   5a                   | pop                 edx

        $sequence_4 = { 895dfc 3b7df0 0f857affffff e9???????? 83ceff e9???????? 8b4514 }
            // n = 7, score = 4800
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   3b7df0               | cmp                 edi, dword ptr [ebp - 0x10]
            //   0f857affffff         | jne                 0xffffff80
            //   e9????????           |                     
            //   83ceff               | or                  esi, 0xffffffff
            //   e9????????           |                     
            //   8b4514               | mov                 eax, dword ptr [ebp + 0x14]

        $sequence_5 = { c745fc00040000 e8???????? 84c0 750f }
            // n = 4, score = 4800
            //   c745fc00040000       | mov                 dword ptr [ebp - 4], 0x400
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   750f                 | jne                 0x11

        $sequence_6 = { 57 57 6a01 57 57 8bc6 50 }
            // n = 7, score = 4800
            //   57                   | push                edi
            //   57                   | push                edi
            //   6a01                 | push                1
            //   57                   | push                edi
            //   57                   | push                edi
            //   8bc6                 | mov                 eax, esi
            //   50                   | push                eax

        $sequence_7 = { 75c1 eb0d 53 83c8ff e8???????? }
            // n = 5, score = 4800
            //   75c1                 | jne                 0xffffffc3
            //   eb0d                 | jmp                 0xf
            //   53                   | push                ebx
            //   83c8ff               | or                  eax, 0xffffffff
            //   e8????????           |                     

        $sequence_8 = { 8bec ff7508 e8???????? e8???????? 5d }
            // n = 5, score = 4800
            //   8bec                 | mov                 ebp, esp
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     
            //   e8????????           |                     
            //   5d                   | pop                 ebp

        $sequence_9 = { e8???????? 8d7c0201 8bc7 e8???????? }
            // n = 4, score = 4800
            //   e8????????           |                     
            //   8d7c0201             | lea                 edi, [edx + eax + 1]
            //   8bc7                 | mov                 eax, edi
            //   e8????????           |                     

        $sequence_10 = { 6a0d 5f e8???????? 59 59 }
            // n = 5, score = 4800
            //   6a0d                 | push                0xd
            //   5f                   | pop                 edi
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx

        $sequence_11 = { 5e c20400 55 8bec 8b4d0c 53 }
            // n = 6, score = 4800
            //   5e                   | pop                 esi
            //   c20400               | ret                 4
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   53                   | push                ebx

        $sequence_12 = { e8???????? 5d ff25???????? 55 8bec ff7508 }
            // n = 6, score = 4800
            //   e8????????           |                     
            //   5d                   | pop                 ebp
            //   ff25????????         |                     
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   ff7508               | push                dword ptr [ebp + 8]

        $sequence_13 = { 56 8d5c2420 e8???????? 8bd8 895c241c }
            // n = 5, score = 4800
            //   56                   | push                esi
            //   8d5c2420             | lea                 ebx, [esp + 0x20]
            //   e8????????           |                     
            //   8bd8                 | mov                 ebx, eax
            //   895c241c             | mov                 dword ptr [esp + 0x1c], ebx

        $sequence_14 = { 33f6 8975f8 33ff e8???????? }
            // n = 4, score = 4700
            //   33f6                 | xor                 esi, esi
            //   8975f8               | mov                 dword ptr [ebp - 8], esi
            //   33ff                 | xor                 edi, edi
            //   e8????????           |                     

        $sequence_15 = { e8???????? 85c0 740f ff442410 }
            // n = 4, score = 4600
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   740f                 | je                  0x11
            //   ff442410             | inc                 dword ptr [esp + 0x10]

        $sequence_16 = { e8???????? 85c0 7415 ff45fc }
            // n = 4, score = 4600
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7415                 | je                  0x17
            //   ff45fc               | inc                 dword ptr [ebp - 4]

        $sequence_17 = { 85f6 0f8482000000 85c0 747e }
            // n = 4, score = 4400
            //   85f6                 | test                esi, esi
            //   0f8482000000         | je                  0x88
            //   85c0                 | test                eax, eax
            //   747e                 | je                  0x80

        $sequence_18 = { e8???????? 6a00 ff15???????? cc e8???????? }
            // n = 5, score = 4000
            //   e8????????           |                     
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   cc                   | int3                
            //   e8????????           |                     

        $sequence_19 = { 66ff460e 6639460e 7228 8b4610 8a4e09 8a5614 85c0 }
            // n = 7, score = 3700
            //   66ff460e             | inc                 word ptr [esi + 0xe]
            //   6639460e             | cmp                 word ptr [esi + 0xe], ax
            //   7228                 | jb                  0x2a
            //   8b4610               | mov                 eax, dword ptr [esi + 0x10]
            //   8a4e09               | mov                 cl, byte ptr [esi + 9]
            //   8a5614               | mov                 dl, byte ptr [esi + 0x14]
            //   85c0                 | test                eax, eax

        $sequence_20 = { 33c0 6689460c ff4df8 47 0f8525ffffff 5b }
            // n = 6, score = 3700
            //   33c0                 | xor                 eax, eax
            //   6689460c             | mov                 word ptr [esi + 0xc], ax
            //   ff4df8               | dec                 dword ptr [ebp - 8]
            //   47                   | inc                 edi
            //   0f8525ffffff         | jne                 0xffffff2b
            //   5b                   | pop                 ebx

        $sequence_21 = { 85c0 740b 8a5608 8a4e02 }
            // n = 4, score = 3700
            //   85c0                 | test                eax, eax
            //   740b                 | je                  0xd
            //   8a5608               | mov                 dl, byte ptr [esi + 8]
            //   8a4e02               | mov                 cl, byte ptr [esi + 2]

        $sequence_22 = { 0f8417010000 85ff 0f84dd000000 53 837df800 }
            // n = 5, score = 3700
            //   0f8417010000         | je                  0x11d
            //   85ff                 | test                edi, edi
            //   0f84dd000000         | je                  0xe3
            //   53                   | push                ebx
            //   837df800             | cmp                 dword ptr [ebp - 8], 0

        $sequence_23 = { 8a5602 8b4e10 8a5e14 fec8 }
            // n = 4, score = 3700
            //   8a5602               | mov                 dl, byte ptr [esi + 2]
            //   8b4e10               | mov                 ecx, dword ptr [esi + 0x10]
            //   8a5e14               | mov                 bl, byte ptr [esi + 0x14]
            //   fec8                 | dec                 al

        $sequence_24 = { 73fa 0fb6c0 8b44c104 e9???????? d0e9 }
            // n = 5, score = 3700
            //   73fa                 | jae                 0xfffffffc
            //   0fb6c0               | movzx               eax, al
            //   8b44c104             | mov                 eax, dword ptr [ecx + eax*8 + 4]
            //   e9????????           |                     
            //   d0e9                 | shr                 cl, 1

        $sequence_25 = { eb81 d0e9 3aca 73fa 0fb6c9 8b04c8 }
            // n = 6, score = 3700
            //   eb81                 | jmp                 0xffffff83
            //   d0e9                 | shr                 cl, 1
            //   3aca                 | cmp                 cl, dl
            //   73fa                 | jae                 0xfffffffc
            //   0fb6c9               | movzx               ecx, cl
            //   8b04c8               | mov                 eax, dword ptr [eax + ecx*8]

        $sequence_26 = { 0f8525ffffff 5b b001 eb30 d0e8 }
            // n = 5, score = 3700
            //   0f8525ffffff         | jne                 0xffffff2b
            //   5b                   | pop                 ebx
            //   b001                 | mov                 al, 1
            //   eb30                 | jmp                 0x32
            //   d0e8                 | shr                 al, 1

        $sequence_27 = { 7519 53 53 53 68???????? }
            // n = 5, score = 3500
            //   7519                 | jne                 0x1b
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   68????????           |                     

        $sequence_28 = { 50 e8???????? a1???????? 8944242c }
            // n = 4, score = 3000
            //   50                   | push                eax
            //   e8????????           |                     
            //   a1????????           |                     
            //   8944242c             | mov                 dword ptr [esp + 0x2c], eax

        $sequence_29 = { 51 50 8d041e 50 e8???????? }
            // n = 5, score = 2700
            //   51                   | push                ecx
            //   50                   | push                eax
            //   8d041e               | lea                 eax, [esi + ebx]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_30 = { 83e800 7420 48 7418 }
            // n = 4, score = 2700
            //   83e800               | sub                 eax, 0
            //   7420                 | je                  0x22
            //   48                   | dec                 eax
            //   7418                 | je                  0x1a

        $sequence_31 = { 48 740c 48 7557 }
            // n = 4, score = 2400
            //   48                   | dec                 eax
            //   740c                 | je                  0xe
            //   48                   | dec                 eax
            //   7557                 | jne                 0x59

        $sequence_32 = { c9 c20400 55 8bec 81ecc8000000 53 }
            // n = 6, score = 2300
            //   c9                   | leave               
            //   c20400               | ret                 4
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   81ecc8000000         | sub                 esp, 0xc8
            //   53                   | push                ebx

        $sequence_33 = { e8???????? 85c0 7410 43 }
            // n = 4, score = 2200
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7410                 | je                  0x12
            //   43                   | inc                 ebx

        $sequence_34 = { 51 51 8b4d08 53 56 57 33ff }
            // n = 7, score = 2200
            //   51                   | push                ecx
            //   51                   | push                ecx
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   33ff                 | xor                 edi, edi

        $sequence_35 = { 75c8 5f 5e 8bc3 }
            // n = 4, score = 2100
            //   75c8                 | jne                 0xffffffca
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   8bc3                 | mov                 eax, ebx

        $sequence_36 = { 7410 43 83c608 3bdf }
            // n = 4, score = 2100
            //   7410                 | je                  0x12
            //   43                   | inc                 ebx
            //   83c608               | add                 esi, 8
            //   3bdf                 | cmp                 ebx, edi

        $sequence_37 = { 881d???????? 8ac3 5b c3 }
            // n = 4, score = 1700
            //   881d????????         |                     
            //   8ac3                 | mov                 al, bl
            //   5b                   | pop                 ebx
            //   c3                   | ret                 

        $sequence_38 = { 8b4d14 56 53 e8???????? }
            // n = 4, score = 200
            //   8b4d14               | mov                 ecx, dword ptr [ebp + 0x14]
            //   56                   | push                esi
            //   53                   | push                ebx
            //   e8????????           |                     

        $sequence_39 = { 5d c3 33c0 c3 55 8bec 83e4f8 }
            // n = 7, score = 200
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   33c0                 | xor                 eax, eax
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   83e4f8               | and                 esp, 0xfffffff8

        $sequence_40 = { ff7514 6a01 ff750c ff7508 }
            // n = 4, score = 200
            //   ff7514               | push                dword ptr [ebp + 0x14]
            //   6a01                 | push                1
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   ff7508               | push                dword ptr [ebp + 8]

        $sequence_41 = { 50 8d45fc 50 6a08 }
            // n = 4, score = 200
            //   50                   | push                eax
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   50                   | push                eax
            //   6a08                 | push                8

    condition:
        7 of them and filesize < 1236992
}