rule win_hikit_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.hikit."
        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.hikit"
        malpedia_rule_date = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 4c 8b5c2420 41 8b4328 89442430 48 8b442420 }
            // n = 7, score = 100
            //   4c                   | dec                 esp
            //   8b5c2420             | mov                 ebx, dword ptr [esp + 0x20]
            //   41                   | inc                 ecx
            //   8b4328               | mov                 eax, dword ptr [ebx + 0x28]
            //   89442430             | mov                 dword ptr [esp + 0x30], eax
            //   48                   | dec                 eax
            //   8b442420             | mov                 eax, dword ptr [esp + 0x20]

        $sequence_1 = { 57 8d45e8 50 6819000200 33ff 57 68???????? }
            // n = 7, score = 100
            //   57                   | push                edi
            //   8d45e8               | lea                 eax, dword ptr [ebp - 0x18]
            //   50                   | push                eax
            //   6819000200           | push                0x20019
            //   33ff                 | xor                 edi, edi
            //   57                   | push                edi
            //   68????????           |                     

        $sequence_2 = { 7507 33c0 e9???????? 48 8b8424d8000000 0fb64028 85c0 }
            // n = 7, score = 100
            //   7507                 | jne                 9
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     
            //   48                   | dec                 eax
            //   8b8424d8000000       | mov                 eax, dword ptr [esp + 0xd8]
            //   0fb64028             | movzx               eax, byte ptr [eax + 0x28]
            //   85c0                 | test                eax, eax

        $sequence_3 = { 898370100000 48 8b442470 48 83783800 7415 48 }
            // n = 7, score = 100
            //   898370100000         | mov                 dword ptr [ebx + 0x1070], eax
            //   48                   | dec                 eax
            //   8b442470             | mov                 eax, dword ptr [esp + 0x70]
            //   48                   | dec                 eax
            //   83783800             | cmp                 dword ptr [eax + 0x38], 0
            //   7415                 | je                  0x17
            //   48                   | dec                 eax

        $sequence_4 = { 50 894c2420 ff15???????? 89442410 83f8ff 750b 8d742410 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   894c2420             | mov                 dword ptr [esp + 0x20], ecx
            //   ff15????????         |                     
            //   89442410             | mov                 dword ptr [esp + 0x10], eax
            //   83f8ff               | cmp                 eax, -1
            //   750b                 | jne                 0xd
            //   8d742410             | lea                 esi, dword ptr [esp + 0x10]

        $sequence_5 = { 8b4624 85c0 7406 8b4e20 894820 8b461c 83661c00 }
            // n = 7, score = 100
            //   8b4624               | mov                 eax, dword ptr [esi + 0x24]
            //   85c0                 | test                eax, eax
            //   7406                 | je                  8
            //   8b4e20               | mov                 ecx, dword ptr [esi + 0x20]
            //   894820               | mov                 dword ptr [eax + 0x20], ecx
            //   8b461c               | mov                 eax, dword ptr [esi + 0x1c]
            //   83661c00             | and                 dword ptr [esi + 0x1c], 0

        $sequence_6 = { 50 ff90ec000000 eb22 53 8b5f38 57 53 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   ff90ec000000         | call                dword ptr [eax + 0xec]
            //   eb22                 | jmp                 0x24
            //   53                   | push                ebx
            //   8b5f38               | mov                 ebx, dword ptr [edi + 0x38]
            //   57                   | push                edi
            //   53                   | push                ebx

        $sequence_7 = { 4c 8b8c2490000000 4d 8b4908 4c 8b442468 4d }
            // n = 7, score = 100
            //   4c                   | dec                 esp
            //   8b8c2490000000       | mov                 ecx, dword ptr [esp + 0x90]
            //   4d                   | dec                 ebp
            //   8b4908               | mov                 ecx, dword ptr [ecx + 8]
            //   4c                   | dec                 esp
            //   8b442468             | mov                 eax, dword ptr [esp + 0x68]
            //   4d                   | dec                 ebp

        $sequence_8 = { c745fc00000000 8b4d0c 894df8 8b5514 52 8b45f4 50 }
            // n = 7, score = 100
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   894df8               | mov                 dword ptr [ebp - 8], ecx
            //   8b5514               | mov                 edx, dword ptr [ebp + 0x14]
            //   52                   | push                edx
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   50                   | push                eax

        $sequence_9 = { 8d8c2414010000 51 53 e8???????? 83c40c 83f8ff 7411 }
            // n = 7, score = 100
            //   8d8c2414010000       | lea                 ecx, dword ptr [esp + 0x114]
            //   51                   | push                ecx
            //   53                   | push                ebx
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   83f8ff               | cmp                 eax, -1
            //   7411                 | je                  0x13

    condition:
        7 of them and filesize < 573440
}

rule win_hikit_w0 {
	meta:
		author = "31ric"
		description = "Backdoor.Hikit is a Trojan horse that opens a back door on the compromised computer."
		source = "https://github.com/mattulm/sfiles_yara/blob/master/malware/hiddenlynxfiles.yar"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.hikit"
        malpedia_version = "20170517"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

	strings: 
		$f1 = "w7fw.sys" nocase ascii wide
		$f2 = "w7fw_m.inf" nocase ascii wide
		$f3 = "w7fw.inf" nocase ascii wide
		$f4 = "w7fw.cat" nocase ascii wide
		
	condition:
		1 of them
}