rule win_badflick_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 8bd8 59 391d???????? 7d22 a1???????? 3bc7 }
            // n = 6, score = 100
            //   8bd8                 | mov                 ebx, eax
            //   59                   | pop                 ecx
            //   391d????????         |                     
            //   7d22                 | jge                 0x24
            //   a1????????           |                     
            //   3bc7                 | cmp                 eax, edi

        $sequence_1 = { 59 a3???????? 891d???????? ff750c e8???????? 50 }
            // n = 6, score = 100
            //   59                   | pop                 ecx
            //   a3????????           |                     
            //   891d????????         |                     
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   e8????????           |                     
            //   50                   | push                eax

        $sequence_2 = { 51 51 8b4d0c 8b4101 }
            // n = 4, score = 100
            //   51                   | push                ecx
            //   51                   | push                ecx
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   8b4101               | mov                 eax, dword ptr [ecx + 1]

        $sequence_3 = { ff75e8 ff15???????? ff75e8 ff15???????? 33db 43 ff75e8 }
            // n = 7, score = 100
            //   ff75e8               | push                dword ptr [ebp - 0x18]
            //   ff15????????         |                     
            //   ff75e8               | push                dword ptr [ebp - 0x18]
            //   ff15????????         |                     
            //   33db                 | xor                 ebx, ebx
            //   43                   | inc                 ebx
            //   ff75e8               | push                dword ptr [ebp - 0x18]

        $sequence_4 = { 8bec 83ec2c 8d45d4 50 ff15???????? 8d45f8 }
            // n = 6, score = 100
            //   8bec                 | mov                 ebp, esp
            //   83ec2c               | sub                 esp, 0x2c
            //   8d45d4               | lea                 eax, [ebp - 0x2c]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8d45f8               | lea                 eax, [ebp - 8]

        $sequence_5 = { 23c7 5f c9 c3 55 8bec }
            // n = 6, score = 100
            //   23c7                 | and                 eax, edi
            //   5f                   | pop                 edi
            //   c9                   | leave               
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp

        $sequence_6 = { 6683bdf8fdffff00 56 8db5f8fdffff 7431 56 ff15???????? 50 }
            // n = 7, score = 100
            //   6683bdf8fdffff00     | cmp                 word ptr [ebp - 0x208], 0
            //   56                   | push                esi
            //   8db5f8fdffff         | lea                 esi, [ebp - 0x208]
            //   7431                 | je                  0x33
            //   56                   | push                esi
            //   ff15????????         |                     
            //   50                   | push                eax

        $sequence_7 = { ffd6 59 59 eb03 83c702 66833f00 75f7 }
            // n = 7, score = 100
            //   ffd6                 | call                esi
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   eb03                 | jmp                 5
            //   83c702               | add                 edi, 2
            //   66833f00             | cmp                 word ptr [edi], 0
            //   75f7                 | jne                 0xfffffff9

        $sequence_8 = { ff75f8 ff75e4 ff15???????? ebce 55 8bec 56 }
            // n = 7, score = 100
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   ff75e4               | push                dword ptr [ebp - 0x1c]
            //   ff15????????         |                     
            //   ebce                 | jmp                 0xffffffd0
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   56                   | push                esi

        $sequence_9 = { 8901 83f8ff 750b 57 e8???????? }
            // n = 5, score = 100
            //   8901                 | mov                 dword ptr [ecx], eax
            //   83f8ff               | cmp                 eax, -1
            //   750b                 | jne                 0xd
            //   57                   | push                edi
            //   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*)
}