rule win_ketrum_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.ketrum."
        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.ketrum"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 57 33ff ffb760314200 ff15???????? 898760314200 83c704 }
            // n = 6, score = 200
            //   57                   | push                edi
            //   33ff                 | xor                 edi, edi
            //   ffb760314200         | push                dword ptr [edi + 0x423160]
            //   ff15????????         |                     
            //   898760314200         | mov                 dword ptr [edi + 0x423160], eax
            //   83c704               | add                 edi, 4

        $sequence_1 = { 03f2 f7d7 0bfe 33fa 037df0 8dbc0fa111084e c1cf0b }
            // n = 7, score = 200
            //   03f2                 | add                 esi, edx
            //   f7d7                 | not                 edi
            //   0bfe                 | or                  edi, esi
            //   33fa                 | xor                 edi, edx
            //   037df0               | add                 edi, dword ptr [ebp - 0x10]
            //   8dbc0fa111084e       | lea                 edi, [edi + ecx + 0x4e0811a1]
            //   c1cf0b               | ror                 edi, 0xb

        $sequence_2 = { ffb5f0bfffff ff15???????? ffb5f0bfffff ff15???????? ffb5e4bfffff ffb5f4bfffff }
            // n = 6, score = 200
            //   ffb5f0bfffff         | push                dword ptr [ebp - 0x4010]
            //   ff15????????         |                     
            //   ffb5f0bfffff         | push                dword ptr [ebp - 0x4010]
            //   ff15????????         |                     
            //   ffb5e4bfffff         | push                dword ptr [ebp - 0x401c]
            //   ffb5f4bfffff         | push                dword ptr [ebp - 0x400c]

        $sequence_3 = { 59 85c0 744d b9???????? 8bc1 }
            // n = 5, score = 200
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax
            //   744d                 | je                  0x4f
            //   b9????????           |                     
            //   8bc1                 | mov                 eax, ecx

        $sequence_4 = { ebcb 8b4de0 8b01 8b4004 03c1 }
            // n = 5, score = 200
            //   ebcb                 | jmp                 0xffffffcd
            //   8b4de0               | mov                 ecx, dword ptr [ebp - 0x20]
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   8b4004               | mov                 eax, dword ptr [eax + 4]
            //   03c1                 | add                 eax, ecx

        $sequence_5 = { 50 e8???????? 83c448 ffb5f0cbffff e8???????? }
            // n = 5, score = 200
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c448               | add                 esp, 0x48
            //   ffb5f0cbffff         | push                dword ptr [ebp - 0x3410]
            //   e8????????           |                     

        $sequence_6 = { 56 33db 8d85fcfbffff 53 50 e8???????? }
            // n = 6, score = 200
            //   56                   | push                esi
            //   33db                 | xor                 ebx, ebx
            //   8d85fcfbffff         | lea                 eax, [ebp - 0x404]
            //   53                   | push                ebx
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_7 = { b9???????? 8995e8cbffff 3bc6 7321 898de8cbffff 898df4cbffff 3935???????? }
            // n = 7, score = 200
            //   b9????????           |                     
            //   8995e8cbffff         | mov                 dword ptr [ebp - 0x3418], edx
            //   3bc6                 | cmp                 eax, esi
            //   7321                 | jae                 0x23
            //   898de8cbffff         | mov                 dword ptr [ebp - 0x3418], ecx
            //   898df4cbffff         | mov                 dword ptr [ebp - 0x340c], ecx
            //   3935????????         |                     

        $sequence_8 = { 8b4004 8bd1 c1ea03 8d549a04 }
            // n = 4, score = 100
            //   8b4004               | mov                 eax, dword ptr [eax + 4]
            //   8bd1                 | mov                 edx, ecx
            //   c1ea03               | shr                 edx, 3
            //   8d549a04             | lea                 edx, [edx + ebx*4 + 4]

        $sequence_9 = { 720a b857000780 e8???????? 8b4e14 }
            // n = 4, score = 100
            //   720a                 | jb                  0xc
            //   b857000780           | mov                 eax, 0x80070057
            //   e8????????           |                     
            //   8b4e14               | mov                 ecx, dword ptr [esi + 0x14]

        $sequence_10 = { 57 c785d4eeffff01000000 ff15???????? c68533efffff00 89b520efffff 8b8520efffff }
            // n = 6, score = 100
            //   57                   | push                edi
            //   c785d4eeffff01000000     | mov    dword ptr [ebp - 0x112c], 1
            //   ff15????????         |                     
            //   c68533efffff00       | mov                 byte ptr [ebp - 0x10cd], 0
            //   89b520efffff         | mov                 dword ptr [ebp - 0x10e0], esi
            //   8b8520efffff         | mov                 eax, dword ptr [ebp - 0x10e0]

        $sequence_11 = { 50 6a26 ffb538efffff ff15???????? 85c0 }
            // n = 5, score = 100
            //   50                   | push                eax
            //   6a26                 | push                0x26
            //   ffb538efffff         | push                dword ptr [ebp - 0x10c8]
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_12 = { eb0d 8b75bc 8bcf e8???????? 83c71c 3b7da8 }
            // n = 6, score = 100
            //   eb0d                 | jmp                 0xf
            //   8b75bc               | mov                 esi, dword ptr [ebp - 0x44]
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     
            //   83c71c               | add                 edi, 0x1c
            //   3b7da8               | cmp                 edi, dword ptr [ebp - 0x58]

        $sequence_13 = { 50 e8???????? 59 85c0 753b ff750c }
            // n = 6, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax
            //   753b                 | jne                 0x3d
            //   ff750c               | push                dword ptr [ebp + 0xc]

        $sequence_14 = { e8???????? 83a7c801000000 b830750000 8987d0010000 8987d4010000 c787cc01000060ea0000 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   83a7c801000000       | and                 dword ptr [edi + 0x1c8], 0
            //   b830750000           | mov                 eax, 0x7530
            //   8987d0010000         | mov                 dword ptr [edi + 0x1d0], eax
            //   8987d4010000         | mov                 dword ptr [edi + 0x1d4], eax
            //   c787cc01000060ea0000     | mov    dword ptr [edi + 0x1cc], 0xea60

        $sequence_15 = { 663b16 730e c70308000000 eb0f 668b06 668907 }
            // n = 6, score = 100
            //   663b16               | cmp                 dx, word ptr [esi]
            //   730e                 | jae                 0x10
            //   c70308000000         | mov                 dword ptr [ebx], 8
            //   eb0f                 | jmp                 0x11
            //   668b06               | mov                 ax, word ptr [esi]
            //   668907               | mov                 word ptr [edi], ax

    condition:
        7 of them and filesize < 4599808
}