rule win_plugx_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.plugx"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 8bec a1???????? 83ec5c 53 56 }
            // n = 5, score = 1000
            //   8bec                 | mov                 ebp, esp
            //   a1????????           |                     
            //   83ec5c               | sub                 esp, 0x5c
            //   53                   | push                ebx
            //   56                   | push                esi

        $sequence_1 = { 014710 01462c 8b462c 83c40c 3b4614 }
            // n = 5, score = 1000
            //   014710               | add                 dword ptr [edi + 0x10], eax
            //   01462c               | add                 dword ptr [esi + 0x2c], eax
            //   8b462c               | mov                 eax, dword ptr [esi + 0x2c]
            //   83c40c               | add                 esp, 0xc
            //   3b4614               | cmp                 eax, dword ptr [esi + 0x14]

        $sequence_2 = { 8945fc 3bc1 7c03 894dfc 8b4610 03462c }
            // n = 6, score = 1000
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   3bc1                 | cmp                 eax, ecx
            //   7c03                 | jl                  5
            //   894dfc               | mov                 dword ptr [ebp - 4], ecx
            //   8b4610               | mov                 eax, dword ptr [esi + 0x10]
            //   03462c               | add                 eax, dword ptr [esi + 0x2c]

        $sequence_3 = { 56 ff55ec 5f 5e 5b c9 c20400 }
            // n = 7, score = 1000
            //   56                   | push                esi
            //   ff55ec               | call                dword ptr [ebp - 0x14]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   c9                   | leave               
            //   c20400               | ret                 4

        $sequence_4 = { 7c03 894dfc 8b4610 03462c }
            // n = 4, score = 1000
            //   7c03                 | jl                  5
            //   894dfc               | mov                 dword ptr [ebp - 4], ecx
            //   8b4610               | mov                 eax, dword ptr [esi + 0x10]
            //   03462c               | add                 eax, dword ptr [esi + 0x2c]

        $sequence_5 = { a1???????? 53 33db 56 57 895de8 }
            // n = 6, score = 1000
            //   a1????????           |                     
            //   53                   | push                ebx
            //   33db                 | xor                 ebx, ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   895de8               | mov                 dword ptr [ebp - 0x18], ebx

        $sequence_6 = { 8b4610 8308ff 8b4610 8308ff }
            // n = 4, score = 1000
            //   8b4610               | mov                 eax, dword ptr [esi + 0x10]
            //   8308ff               | or                  dword ptr [eax], 0xffffffff
            //   8b4610               | mov                 eax, dword ptr [esi + 0x10]
            //   8308ff               | or                  dword ptr [eax], 0xffffffff

        $sequence_7 = { 7605 41 3bc8 7cf4 }
            // n = 4, score = 1000
            //   7605                 | jbe                 7
            //   41                   | inc                 ecx
            //   3bc8                 | cmp                 ecx, eax
            //   7cf4                 | jl                  0xfffffff6

        $sequence_8 = { 50 894dec e8???????? 59 57 ff75f0 }
            // n = 6, score = 1000
            //   50                   | push                eax
            //   894dec               | mov                 dword ptr [ebp - 0x14], ecx
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   57                   | push                edi
            //   ff75f0               | push                dword ptr [ebp - 0x10]

        $sequence_9 = { 59 57 ff75f0 53 }
            // n = 4, score = 1000
            //   59                   | pop                 ecx
            //   57                   | push                edi
            //   ff75f0               | push                dword ptr [ebp - 0x10]
            //   53                   | push                ebx

    condition:
        7 of them and filesize < 598016
}

rule win_plugx_w1 {
    meta:
        description = "PlugX Identifying Strings"
        author = "Seth Hardy"
        last_modified = "2014-06-12"
		source = "https://github.com/mattulm/sfiles_yara/blob/master/malware/plugx.yar"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.plugx"
        malpedia_version = "20170517"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
        
    strings:
        $BootLDR = "boot.ldr" wide ascii
        $Dwork = "d:\\work" nocase
        $Plug25 = "plug2.5"
        $Plug30 = "Plug3.0"
        $Shell6 = "Shell6"
      
    condition:
        $BootLDR or ($Dwork and ($Plug25 or $Plug30 or $Shell6))
}

rule win_plugx_w2 {
	meta:
		author = "Jean-Philippe Teissier / @Jipe_"
		description = "PlugX RAT"
		date = "2014-05-13"
		filetype = "memory"
		version = "1.0" 
		ref1 = "https://github.com/mattulm/IR-things/blob/master/volplugs/plugx.py"
		source = "https://github.com/mattulm/sfiles_yara/blob/master/malware/plugx.yar"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.plugx"
        malpedia_version = "20170517"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
		
	strings:
		$v1a = { 47 55 4C 50 00 00 00 00 }
		$v1b = "/update?id=%8.8x" 
		$v1algoa = { BB 33 33 33 33 2B } 
		$v1algob = { BB 44 44 44 44 2B } 
		$v2a = "Proxy-Auth:" 
		$v2b = { 68 A0 02 00 00 } 
		$v2k = { C1 8F 3A 71 } 
		
	condition: 
		$v1a at 0 or $v1b or (($v2a or $v2b) and (($v1algoa and $v1algob) or $v2k))
}