rule win_kardonloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.kardonloader."
        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.kardonloader"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { 53 e8???????? 59 5b 8b7710 8d45fc }
            // n = 6, score = 200
            //   53                   | push                ebx
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   5b                   | pop                 ebx
            //   8b7710               | mov                 esi, dword ptr [edi + 0x10]
            //   8d45fc               | lea                 eax, [ebp - 4]

        $sequence_1 = { be???????? 50 33ff 56 897dfc e8???????? }
            // n = 6, score = 200
            //   be????????           |                     
            //   50                   | push                eax
            //   33ff                 | xor                 edi, edi
            //   56                   | push                esi
            //   897dfc               | mov                 dword ptr [ebp - 4], edi
            //   e8????????           |                     

        $sequence_2 = { 7e96 8b45f8 83f801 7541 0fb6441f01 8a9018314000 }
            // n = 6, score = 200
            //   7e96                 | jle                 0xffffff98
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   83f801               | cmp                 eax, 1
            //   7541                 | jne                 0x43
            //   0fb6441f01           | movzx               eax, byte ptr [edi + ebx + 1]
            //   8a9018314000         | mov                 dl, byte ptr [eax + 0x403118]

        $sequence_3 = { 85c0 7409 8d85787cffff 894710 8d45f8 }
            // n = 5, score = 200
            //   85c0                 | test                eax, eax
            //   7409                 | je                  0xb
            //   8d85787cffff         | lea                 eax, [ebp - 0x8388]
            //   894710               | mov                 dword ptr [edi + 0x10], eax
            //   8d45f8               | lea                 eax, [ebp - 8]

        $sequence_4 = { 0f8565010000 e8???????? 84c0 0f8558010000 e8???????? 84c0 0f854b010000 }
            // n = 7, score = 200
            //   0f8565010000         | jne                 0x16b
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   0f8558010000         | jne                 0x15e
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   0f854b010000         | jne                 0x151

        $sequence_5 = { f7f9 8b4d10 8901 40 50 }
            // n = 5, score = 200
            //   f7f9                 | idiv                ecx
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   8901                 | mov                 dword ptr [ecx], eax
            //   40                   | inc                 eax
            //   50                   | push                eax

        $sequence_6 = { 8d4598 50 e8???????? 59 59 85c0 }
            // n = 6, score = 200
            //   8d4598               | lea                 eax, [ebp - 0x68]
            //   50                   | push                eax
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax

        $sequence_7 = { 6804010000 8d8578feffff 33f6 50 56 ff15???????? 8d8578feffff }
            // n = 7, score = 200
            //   6804010000           | push                0x104
            //   8d8578feffff         | lea                 eax, [ebp - 0x188]
            //   33f6                 | xor                 esi, esi
            //   50                   | push                eax
            //   56                   | push                esi
            //   ff15????????         |                     
            //   8d8578feffff         | lea                 eax, [ebp - 0x188]

        $sequence_8 = { 7e1e 46 803e20 7ffa eb16 3c22 7411 }
            // n = 7, score = 200
            //   7e1e                 | jle                 0x20
            //   46                   | inc                 esi
            //   803e20               | cmp                 byte ptr [esi], 0x20
            //   7ffa                 | jg                  0xfffffffc
            //   eb16                 | jmp                 0x18
            //   3c22                 | cmp                 al, 0x22
            //   7411                 | je                  0x13

        $sequence_9 = { 33f6 83f902 7d0c 8b4510 8930 33c0 }
            // n = 6, score = 200
            //   33f6                 | xor                 esi, esi
            //   83f902               | cmp                 ecx, 2
            //   7d0c                 | jge                 0xe
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   8930                 | mov                 dword ptr [eax], esi
            //   33c0                 | xor                 eax, eax

    condition:
        7 of them and filesize < 57344
}

rule win_kardonloader_w0 {
	meta:
		author = "TJ Nel"
    	company = "Arbor Networks"
		date = "2017-06-10"
		description = "Yara signature for Kardon Loader"
		sha256_0 = "fd0dfb173aff74429c6fed55608ee99a24e28f64ae600945e15bf5fce6406aee"
		sha256_1 = "3c64d7dbef4b7e0dd81a5076172451334fe9669800c40c895567226f7cb7cdc7"
		sha256_2 = "fd0dfb173aff74429c6fed55608ee99a24e28f64ae600945e15bf5fce6406aee"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.kardonloader"
        malpedia_version = "20180620"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
	strings:
		$c0 = "&op=%d&td=%s" ascii
		$c1 = "uni=1" ascii
		$c2 = "id=%s&os=%s&pv=%s&ip=%s&cn=%s&un=%s&ca=%s" fullword ascii
		$a0 = "KVMKVMKVM" fullword ascii
		$a1 = "VMwareVMware" fullword ascii
		$a2 = "VBoxVBoxVBox" fullword ascii
		$a3 = "avghook" ascii
		$a4 = "sbiedll.dll" fullword ascii
		$s0 = "\\Documents\\Programming\\KRDN\\CLIENT" ascii
		$s1 = "POST %s HTTP/1.1" fullword ascii
		$s2 = "/gate.php" ascii
		$s3 = "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run" fullword ascii
		$s4 = "notask" fullword ascii
		$s5 = "%s\\%s.exe" fullword ascii
		$s6 = ".rdata$zzzdbg" fullword ascii
	condition:
			( uint16(0) == 0x5a4d and (any of ($c*)) and (all of ($a*)) and (3 of ($s*)) )
}