rule win_badflick_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        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 = "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 = { 59 8b0e 8b09 83c604 894c07fc }
            // n = 5, score = 100
            //   59                   | pop                 ecx
            //   8b0e                 | mov                 ecx, dword ptr [esi]
            //   8b09                 | mov                 ecx, dword ptr [ecx]
            //   83c604               | add                 esi, 4
            //   894c07fc             | mov                 dword ptr [edi + eax - 4], ecx

        $sequence_1 = { 53 ff15???????? 85c0 7411 3b7df8 }
            // n = 5, score = 100
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7411                 | je                  0x13
            //   3b7df8               | cmp                 edi, dword ptr [ebp - 8]

        $sequence_2 = { 85c0 7471 8b07 3b45fc 756a 0fb74606 }
            // n = 6, score = 100
            //   85c0                 | test                eax, eax
            //   7471                 | je                  0x73
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   3b45fc               | cmp                 eax, dword ptr [ebp - 4]
            //   756a                 | jne                 0x6c
            //   0fb74606             | movzx               eax, word ptr [esi + 6]

        $sequence_3 = { 8bec 83ec1c 8365fc00 56 8b7510 85f6 7411 }
            // n = 7, score = 100
            //   8bec                 | mov                 ebp, esp
            //   83ec1c               | sub                 esp, 0x1c
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   56                   | push                esi
            //   8b7510               | mov                 esi, dword ptr [ebp + 0x10]
            //   85f6                 | test                esi, esi
            //   7411                 | je                  0x13

        $sequence_4 = { 8d44000a 50 6a41 e8???????? ff750c 8bf0 8d460d }
            // n = 7, score = 100
            //   8d44000a             | lea                 eax, [eax + eax + 0xa]
            //   50                   | push                eax
            //   6a41                 | push                0x41
            //   e8????????           |                     
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   8bf0                 | mov                 esi, eax
            //   8d460d               | lea                 eax, [esi + 0xd]

        $sequence_5 = { 53 50 ff15???????? ff75fc 8b35???????? }
            // n = 5, score = 100
            //   53                   | push                ebx
            //   50                   | push                eax
            //   ff15????????         |                     
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   8b35????????         |                     

        $sequence_6 = { 56 e8???????? 56 8bf8 57 ff750c ff7508 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   e8????????           |                     
            //   56                   | push                esi
            //   8bf8                 | mov                 edi, eax
            //   57                   | push                edi
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   ff7508               | push                dword ptr [ebp + 8]

        $sequence_7 = { 59 50 8d85e0faffff 68???????? 50 ffd7 }
            // n = 6, score = 100
            //   59                   | pop                 ecx
            //   50                   | push                eax
            //   8d85e0faffff         | lea                 eax, [ebp - 0x520]
            //   68????????           |                     
            //   50                   | push                eax
            //   ffd7                 | call                edi

        $sequence_8 = { 50 6a41 e8???????? ff750c 8bf0 8d460d }
            // n = 6, score = 100
            //   50                   | push                eax
            //   6a41                 | push                0x41
            //   e8????????           |                     
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   8bf0                 | mov                 esi, eax
            //   8d460d               | lea                 eax, [esi + 0xd]

        $sequence_9 = { 6a01 ff7305 e8???????? 59 50 56 e8???????? }
            // n = 7, score = 100
            //   6a01                 | push                1
            //   ff7305               | push                dword ptr [ebx + 5]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   50                   | push                eax
            //   56                   | push                esi
            //   e8????????           |                     

    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*)
}