rule win_badflick_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2024-10-31"
        version = "1"
        description = "Detects win.badflick."
        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.badflick"
        malpedia_rule_date = "20241030"
        malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4"
        malpedia_version = "20241030"
        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 = { ff35???????? 8d85ecfbffff ff35???????? 68???????? ff35???????? 68???????? 68???????? }
            // n = 7, score = 100
            //   ff35????????         |                     
            //   8d85ecfbffff         | lea                 eax, [ebp - 0x414]
            //   ff35????????         |                     
            //   68????????           |                     
            //   ff35????????         |                     
            //   68????????           |                     
            //   68????????           |                     

        $sequence_1 = { ff15???????? 85c0 0f8425010000 837dfc04 0f851b010000 }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f8425010000         | je                  0x12b
            //   837dfc04             | cmp                 dword ptr [ebp - 4], 4
            //   0f851b010000         | jne                 0x121

        $sequence_2 = { a5 a5 a5 e8???????? 33db 59 885d0b }
            // n = 7, score = 100
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   e8????????           |                     
            //   33db                 | xor                 ebx, ebx
            //   59                   | pop                 ecx
            //   885d0b               | mov                 byte ptr [ebp + 0xb], bl

        $sequence_3 = { ff15???????? 8bd8 83fbff 746b 56 }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   8bd8                 | mov                 ebx, eax
            //   83fbff               | cmp                 ebx, -1
            //   746b                 | je                  0x6d
            //   56                   | push                esi

        $sequence_4 = { e9???????? 33db 395df8 74e2 6800800000 }
            // n = 5, score = 100
            //   e9????????           |                     
            //   33db                 | xor                 ebx, ebx
            //   395df8               | cmp                 dword ptr [ebp - 8], ebx
            //   74e2                 | je                  0xffffffe4
            //   6800800000           | push                0x8000

        $sequence_5 = { 8bf0 68???????? 56 ff15???????? 85c0 0f85e7000000 6a01 }
            // n = 7, score = 100
            //   8bf0                 | mov                 esi, eax
            //   68????????           |                     
            //   56                   | push                esi
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f85e7000000         | jne                 0xed
            //   6a01                 | push                1

        $sequence_6 = { 56 ff15???????? 50 0fb706 50 }
            // n = 5, score = 100
            //   56                   | push                esi
            //   ff15????????         |                     
            //   50                   | push                eax
            //   0fb706               | movzx               eax, word ptr [esi]
            //   50                   | push                eax

        $sequence_7 = { 8d85a8fbffff 50 7408 e8???????? }
            // n = 4, score = 100
            //   8d85a8fbffff         | lea                 eax, [ebp - 0x458]
            //   50                   | push                eax
            //   7408                 | je                  0xa
            //   e8????????           |                     

        $sequence_8 = { ff7508 ff15???????? 53 ff15???????? 5f }
            // n = 5, score = 100
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ff15????????         |                     
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   5f                   | pop                 edi

        $sequence_9 = { ff15???????? 32c0 eb3e ff7510 e8???????? 8bf0 }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   32c0                 | xor                 al, al
            //   eb3e                 | jmp                 0x40
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax

    condition:
        7 of them and filesize < 81920
}

rule win_badflick_w0 {
    meta:
		description = "Detects BADFLICK backdoor"
		author = "@VK_Intel"
		reference = "BADFLICK backdoor"
		date = "2018-03-26"
		hash = "7ba05abdf8f0323aa30c3d52e22df951eb5b67a2620014336eab7907b0a5cedf"
		reference = "https://www.fireeye.com/blog/threat-research/2018/03/suspected-chinese-espionage-group-targeting-maritime-and-engineering-industries.html"
		malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.badflick"
		malpedia_version = "20180407"
		malpedia_license = "CC BY-NC-SA 4.0"
		malpedia_sharing = "TLP:WHITE"
    strings:
		$s0 = "%s\\en-US\\cmd.exe.mui" fullword wide
		$s1 = "[Green] pid=%d tid=%d modulePath=%s|" fullword wide
		$s2 = "1|103.243.175.181|80|5|xxxxxxxxxxxxxxxxxxxxxxx" wide ascii
		$s3 = "modulePath=%[^|]" fullword wide
		$s4 = "%s:%d:%s:%d:%d" fullword ascii
		$s5 = "regsvr32 %s %s %s go \"%s\"" fullword wide
		$s6 = "modulePath=" fullword wide
		$s7 = "%d %d.%d.%d %s" fullword wide
		$s8 = "winMain static green" fullword wide
		$s9 = "o%d Core %.2f GHz" fullword wide
		$s10 = "6&62676=6B6G6N6c6s6" fullword ascii

		$op0 = { 8b 54 24 54 8b cf 2b cb 8d 04 0a 3b c7 76 02 8b } 
		$op1 = { a1 08 77 40 00 89 45 94 8d 45 94 50 ff 35 04 77 } 
		$op2 = { 8b 7c 24 14 8b f7 2b f5 8d 64 24 00 8a 1f 84 db }
	condition:
		uint16(0) == 0x5a4d and filesize < 108KB and 8 of ($s*) and 1 of ($op*)
}