rule win_badflick_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        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 = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { 8d4609 ff75f8 50 e8???????? 57 }
            // n = 5, score = 100
            //   8d4609               | lea                 eax, [esi + 9]
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   50                   | push                eax
            //   e8????????           |                     
            //   57                   | push                edi

        $sequence_1 = { 8d4dfc 51 50 8b4704 03450c }
            // n = 5, score = 100
            //   8d4dfc               | lea                 ecx, [ebp - 4]
            //   51                   | push                ecx
            //   50                   | push                eax
            //   8b4704               | mov                 eax, dword ptr [edi + 4]
            //   03450c               | add                 eax, dword ptr [ebp + 0xc]

        $sequence_2 = { 740c 6a08 59 8d75d0 8bf8 f3a5 eb02 }
            // n = 7, score = 100
            //   740c                 | je                  0xe
            //   6a08                 | push                8
            //   59                   | pop                 ecx
            //   8d75d0               | lea                 esi, [ebp - 0x30]
            //   8bf8                 | mov                 edi, eax
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   eb02                 | jmp                 4

        $sequence_3 = { ff7510 53 eb18 83f8ff 741c 03f8 }
            // n = 6, score = 100
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   53                   | push                ebx
            //   eb18                 | jmp                 0x1a
            //   83f8ff               | cmp                 eax, -1
            //   741c                 | je                  0x1e
            //   03f8                 | add                 edi, eax

        $sequence_4 = { 85c0 7521 ff15???????? 3dea000000 }
            // n = 4, score = 100
            //   85c0                 | test                eax, eax
            //   7521                 | jne                 0x23
            //   ff15????????         |                     
            //   3dea000000           | cmp                 eax, 0xea

        $sequence_5 = { ff75b4 e8???????? 6a01 50 ff75fc }
            // n = 5, score = 100
            //   ff75b4               | push                dword ptr [ebp - 0x4c]
            //   e8????????           |                     
            //   6a01                 | push                1
            //   50                   | push                eax
            //   ff75fc               | push                dword ptr [ebp - 4]

        $sequence_6 = { 897e09 8b3d???????? 50 ffd7 8b4609 ff7510 8d44460d }
            // n = 7, score = 100
            //   897e09               | mov                 dword ptr [esi + 9], edi
            //   8b3d????????         |                     
            //   50                   | push                eax
            //   ffd7                 | call                edi
            //   8b4609               | mov                 eax, dword ptr [esi + 9]
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   8d44460d             | lea                 eax, [esi + eax*2 + 0xd]

        $sequence_7 = { 50 6804000098 57 c745f001000000 c745f400f40100 c745f8e8030000 ff15???????? }
            // n = 7, score = 100
            //   50                   | push                eax
            //   6804000098           | push                0x98000004
            //   57                   | push                edi
            //   c745f001000000       | mov                 dword ptr [ebp - 0x10], 1
            //   c745f400f40100       | mov                 dword ptr [ebp - 0xc], 0x1f400
            //   c745f8e8030000       | mov                 dword ptr [ebp - 8], 0x3e8
            //   ff15????????         |                     

        $sequence_8 = { 6a3d e8???????? 8bf0 8a4508 59 59 884605 }
            // n = 7, score = 100
            //   6a3d                 | push                0x3d
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   8a4508               | mov                 al, byte ptr [ebp + 8]
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   884605               | mov                 byte ptr [esi + 5], al

        $sequence_9 = { 8d85a8fbffff 50 7408 e8???????? 59 }
            // n = 5, score = 100
            //   8d85a8fbffff         | lea                 eax, [ebp - 0x458]
            //   50                   | push                eax
            //   7408                 | je                  0xa
            //   e8????????           |                     
            //   59                   | pop                 ecx

    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*)
}