rule win_shylock_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        version = "1"
        description = "Detects win.shylock."
        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.shylock"
        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 = { e8???????? 84c0 7536 8d4df8 8d430c e8???????? }
            // n = 6, score = 500
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   7536                 | jne                 0x38
            //   8d4df8               | lea                 ecx, [ebp - 8]
            //   8d430c               | lea                 eax, [ebx + 0xc]
            //   e8????????           |                     

        $sequence_1 = { 8b4610 40 52 ff36 ff7604 ff7608 ff760c }
            // n = 7, score = 500
            //   8b4610               | mov                 eax, dword ptr [esi + 0x10]
            //   40                   | inc                 eax
            //   52                   | push                edx
            //   ff36                 | push                dword ptr [esi]
            //   ff7604               | push                dword ptr [esi + 4]
            //   ff7608               | push                dword ptr [esi + 8]
            //   ff760c               | push                dword ptr [esi + 0xc]

        $sequence_2 = { 8bec 51 837f04ff 7504 33c0 eb4b 56 }
            // n = 7, score = 500
            //   8bec                 | mov                 ebp, esp
            //   51                   | push                ecx
            //   837f04ff             | cmp                 dword ptr [edi + 4], -1
            //   7504                 | jne                 6
            //   33c0                 | xor                 eax, eax
            //   eb4b                 | jmp                 0x4d
            //   56                   | push                esi

        $sequence_3 = { ff751c 8d45fc ff7518 ff7514 ff7510 50 b8???????? }
            // n = 7, score = 500
            //   ff751c               | push                dword ptr [ebp + 0x1c]
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   ff7518               | push                dword ptr [ebp + 0x18]
            //   ff7514               | push                dword ptr [ebp + 0x14]
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   50                   | push                eax
            //   b8????????           |                     

        $sequence_4 = { eb03 8d0491 8b00 8b4008 8945f0 85c9 7504 }
            // n = 7, score = 500
            //   eb03                 | jmp                 5
            //   8d0491               | lea                 eax, [ecx + edx*4]
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   8b4008               | mov                 eax, dword ptr [eax + 8]
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   85c9                 | test                ecx, ecx
            //   7504                 | jne                 6

        $sequence_5 = { e8???????? a1???????? 895df0 8b80bc000000 6aff 8945f4 6a00 }
            // n = 7, score = 500
            //   e8????????           |                     
            //   a1????????           |                     
            //   895df0               | mov                 dword ptr [ebp - 0x10], ebx
            //   8b80bc000000         | mov                 eax, dword ptr [eax + 0xbc]
            //   6aff                 | push                -1
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   6a00                 | push                0

        $sequence_6 = { e8???????? 8d45b8 50 b8???????? e8???????? 59 8bc8 }
            // n = 7, score = 500
            //   e8????????           |                     
            //   8d45b8               | lea                 eax, [ebp - 0x48]
            //   50                   | push                eax
            //   b8????????           |                     
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8bc8                 | mov                 ecx, eax

        $sequence_7 = { b8???????? e8???????? 8d75ac 8bfc e8???????? 51 8d75f8 }
            // n = 7, score = 500
            //   b8????????           |                     
            //   e8????????           |                     
            //   8d75ac               | lea                 esi, [ebp - 0x54]
            //   8bfc                 | mov                 edi, esp
            //   e8????????           |                     
            //   51                   | push                ecx
            //   8d75f8               | lea                 esi, [ebp - 8]

        $sequence_8 = { 5b 8be5 5d c20800 8d7708 8d5d08 }
            // n = 6, score = 500
            //   5b                   | pop                 ebx
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c20800               | ret                 8
            //   8d7708               | lea                 esi, [edi + 8]
            //   8d5d08               | lea                 ebx, [ebp + 8]

        $sequence_9 = { 83f8ff 7515 33ff 8d7508 e8???????? 8bc7 5f }
            // n = 7, score = 500
            //   83f8ff               | cmp                 eax, -1
            //   7515                 | jne                 0x17
            //   33ff                 | xor                 edi, edi
            //   8d7508               | lea                 esi, [ebp + 8]
            //   e8????????           |                     
            //   8bc7                 | mov                 eax, edi
            //   5f                   | pop                 edi

    condition:
        7 of them and filesize < 630784
}

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*)
}