rule win_shylock_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-05-30"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.4.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.shylock"
        malpedia_rule_date = "20200529"
        malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8"
        malpedia_version = "20200529"
        malpedia_license = "CC BY-NC-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 / approach 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 = { 51 51 a1???????? 53 56 57 8bb81c010000 }
            // n = 7, score = 400
            //   51                   | push                ecx
            //   51                   | push                ecx
            //   a1????????           |                     
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   8bb81c010000         | mov                 edi, dword ptr [eax + 0x11c]

        $sequence_1 = { 83e4f8 51 51 837d1000 53 57 8bf8 }
            // n = 7, score = 400
            //   83e4f8               | and                 esp, 0xfffffff8
            //   51                   | push                ecx
            //   51                   | push                ecx
            //   837d1000             | cmp                 dword ptr [ebp + 0x10], 0
            //   53                   | push                ebx
            //   57                   | push                edi
            //   8bf8                 | mov                 edi, eax

        $sequence_2 = { c3 55 8bec 8b4508 8b08 53 890f }
            // n = 7, score = 400
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   53                   | push                ebx
            //   890f                 | mov                 dword ptr [edi], ecx

        $sequence_3 = { ff75f8 895df4 e8???????? 83c41c ff45fc 3bc7 7586 }
            // n = 7, score = 400
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   895df4               | mov                 dword ptr [ebp - 0xc], ebx
            //   e8????????           |                     
            //   83c41c               | add                 esp, 0x1c
            //   ff45fc               | inc                 dword ptr [ebp - 4]
            //   3bc7                 | cmp                 eax, edi
            //   7586                 | jne                 0xffffff88

        $sequence_4 = { e8???????? 8db570feffff e8???????? 8d75d4 e8???????? 8db568feffff e8???????? }
            // n = 7, score = 400
            //   e8????????           |                     
            //   8db570feffff         | lea                 esi, [ebp - 0x190]
            //   e8????????           |                     
            //   8d75d4               | lea                 esi, [ebp - 0x2c]
            //   e8????????           |                     
            //   8db568feffff         | lea                 esi, [ebp - 0x198]
            //   e8????????           |                     

        $sequence_5 = { 53 8bf8 e8???????? ff7660 83665c00 e8???????? 59 }
            // n = 7, score = 400
            //   53                   | push                ebx
            //   8bf8                 | mov                 edi, eax
            //   e8????????           |                     
            //   ff7660               | push                dword ptr [esi + 0x60]
            //   83665c00             | and                 dword ptr [esi + 0x5c], 0
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_6 = { ffb570ffffff 8bb56cffffff 8d8568ffffff e8???????? 8d45c4 e8???????? 0fb6c0 }
            // n = 7, score = 400
            //   ffb570ffffff         | push                dword ptr [ebp - 0x90]
            //   8bb56cffffff         | mov                 esi, dword ptr [ebp - 0x94]
            //   8d8568ffffff         | lea                 eax, [ebp - 0x98]
            //   e8????????           |                     
            //   8d45c4               | lea                 eax, [ebp - 0x3c]
            //   e8????????           |                     
            //   0fb6c0               | movzx               eax, al

        $sequence_7 = { ff36 e8???????? 59 59 85c0 740d 8906 }
            // n = 7, score = 400
            //   ff36                 | push                dword ptr [esi]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax
            //   740d                 | je                  0xf
            //   8906                 | mov                 dword ptr [esi], eax

        $sequence_8 = { e8???????? ff45f8 8b45f8 8345fc0c 3b4304 72dd 33f6 }
            // n = 7, score = 400
            //   e8????????           |                     
            //   ff45f8               | inc                 dword ptr [ebp - 8]
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8345fc0c             | add                 dword ptr [ebp - 4], 0xc
            //   3b4304               | cmp                 eax, dword ptr [ebx + 4]
            //   72dd                 | jb                  0xffffffdf
            //   33f6                 | xor                 esi, esi

        $sequence_9 = { e8???????? ff75f4 8b75f0 8d45d4 e8???????? 8d45d4 50 }
            // n = 7, score = 400
            //   e8????????           |                     
            //   ff75f4               | push                dword ptr [ebp - 0xc]
            //   8b75f0               | mov                 esi, dword ptr [ebp - 0x10]
            //   8d45d4               | lea                 eax, [ebp - 0x2c]
            //   e8????????           |                     
            //   8d45d4               | lea                 eax, [ebp - 0x2c]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 622592
}

rule win_shylock_w0 {
	meta:
		author = "Jean-Philippe Teissier / @Jipe_"
		description = "Shylock Banker"
		date = "2013-12-12" 
		version = "1.0" 
		ref1 = "http://iocbucket.com/iocs/1b4660d57928df5ca843c21df0b2adb117026cba"
		ref2 = "http://www.trusteer.com/blog/merchant-fraud-returns-%E2%80%93-shylock-polymorphic-financial-malware-infections-rise"
		ref3 = "https://www.csis.dk/en/csis/blog/3811/"
		source = "https://github.com/mattulm/sfiles_yara/blob/master/malware/Shylock.yar"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.shylock"
        malpedia_version = "20170517"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
	strings:
		$process1 = "MASTER"
		$process2 = "_SHUTDOWN"
		$process3 = "EVT_VNC"
		$process4 = "EVT_BACK"
		$process5 = "EVT_VNC"
		$process6 = "IE_Hook::GetRequestInfo"
		$process7 = "FF_Hook::getRequestInfo"
		$process8 = "EX_Hook::CreateProcess"
		$process9 = "hijackdll.dll"
		$process10 = "MTX_"
		$process11 = "FF::PR_WriteHook entry"
		$process12 = "FF::PR_WriteHook exit"
		$process13 = "HijackProcessAttach::*** MASTER *** MASTER *** MASTER *** %s PID=%u"
		$process14 = "HijackProcessAttach::entry"
		$process15 = "FF::BEFORE INJECT"
		$process16 = "FF::AFTER INJECT"
		$process17 = "IE::AFTER INJECT"
		$process18 = "IE::BEFORE INJECT"
		$process19 = "*** VNC *** VNC *** VNC *** VNC *** VNC *** VNC *** VNC *** VNC *** VNC *** VNC *** %s"
		$process20 = "*** LOG INJECTS *** %s"
		$process21 = "*** inject to process %s not allowed"
		$process22 = "*** BackSocks *** BackSocks *** BackSocks *** BackSocks *** BackSocks *** BackSocks *** BackSocks *** %s"
		$process23 = "Inject::InjectDllFromMemory"
		$process24 = "BadSocks.dll"	
		$process25 = ".?AVFF_Hook@@"
		$process26 = ".?AVIE_Hook@@"
		$process27 = ".?AVPE_Hook@@"
		$process28 = ".?AVCInetMethods@@"
		$domain1 = "extensadv.cc"
		$domain2 = "topbeat.cc"
		$domain3 = "brainsphere.cc"
		$domain4 = "commonworldme.cc"
		$domain5 = "gigacat.cc"
		$domain6 = "nw-serv.cc"
		$domain7 = "paragua-analyst.cc"
		
	condition:
		3 of ($process*) or any of ($domain*)
}