rule win_shylock_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2021-10-07"
        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 = "20211007"
        malpedia_hash = "e5b790e0f888f252d49063a1251ca60ec2832535"
        malpedia_version = "20211008"
        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???????? 8d75f4 e8???????? 5f 5e c9 c21400 }
            // n = 7, score = 500
            //   e8????????           |                     
            //   8d75f4               | lea                 esi, dword ptr [ebp - 0xc]
            //   e8????????           |                     
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   c9                   | leave               
            //   c21400               | ret                 0x14

        $sequence_1 = { 746a 8365fc00 53 56 8d3408 57 8bd8 }
            // n = 7, score = 500
            //   746a                 | je                  0x6c
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   53                   | push                ebx
            //   56                   | push                esi
            //   8d3408               | lea                 esi, dword ptr [eax + ecx]
            //   57                   | push                edi
            //   8bd8                 | mov                 ebx, eax

        $sequence_2 = { 8d8558ffffff 50 8d854cffffff 50 899550ffffff e8???????? 59 }
            // n = 7, score = 500
            //   8d8558ffffff         | lea                 eax, dword ptr [ebp - 0xa8]
            //   50                   | push                eax
            //   8d854cffffff         | lea                 eax, dword ptr [ebp - 0xb4]
            //   50                   | push                eax
            //   899550ffffff         | mov                 dword ptr [ebp - 0xb0], edx
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_3 = { ff75f8 56 e8???????? 85c0 0f85fdfdffff 8d45b4 50 }
            // n = 7, score = 500
            //   ff75f8               | push                dword ptr [ebp - 8]
            //   56                   | push                esi
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   0f85fdfdffff         | jne                 0xfffffe03
            //   8d45b4               | lea                 eax, dword ptr [ebp - 0x4c]
            //   50                   | push                eax

        $sequence_4 = { 8d7de4 e8???????? 8d45e8 e8???????? 84c0 7505 ff75e8 }
            // n = 7, score = 500
            //   8d7de4               | lea                 edi, dword ptr [ebp - 0x1c]
            //   e8????????           |                     
            //   8d45e8               | lea                 eax, dword ptr [ebp - 0x18]
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   7505                 | jne                 7
            //   ff75e8               | push                dword ptr [ebp - 0x18]

        $sequence_5 = { e8???????? 59 8b45d0 c9 c21400 55 8bec }
            // n = 7, score = 500
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8b45d0               | mov                 eax, dword ptr [ebp - 0x30]
            //   c9                   | leave               
            //   c21400               | ret                 0x14
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp

        $sequence_6 = { ff7508 a1???????? 8b8820010000 e8???????? 8945fc ff75fc ff7508 }
            // n = 7, score = 500
            //   ff7508               | push                dword ptr [ebp + 8]
            //   a1????????           |                     
            //   8b8820010000         | mov                 ecx, dword ptr [eax + 0x120]
            //   e8????????           |                     
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ff7508               | push                dword ptr [ebp + 8]

        $sequence_7 = { eb34 56 57 ff750c e8???????? 83c40c 85c0 }
            // n = 7, score = 500
            //   eb34                 | jmp                 0x36
            //   56                   | push                esi
            //   57                   | push                edi
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax

        $sequence_8 = { e9???????? 8b45f0 8d4de4 40 51 33d2 8d5df8 }
            // n = 7, score = 500
            //   e9????????           |                     
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   8d4de4               | lea                 ecx, dword ptr [ebp - 0x1c]
            //   40                   | inc                 eax
            //   51                   | push                ecx
            //   33d2                 | xor                 edx, edx
            //   8d5df8               | lea                 ebx, dword ptr [ebp - 8]

        $sequence_9 = { e8???????? b805400080 eb1a ff7510 8bce ff750c c786dc01000002000000 }
            // n = 7, score = 500
            //   e8????????           |                     
            //   b805400080           | mov                 eax, 0x80004005
            //   eb1a                 | jmp                 0x1c
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   8bce                 | mov                 ecx, esi
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   c786dc01000002000000     | mov    dword ptr [esi + 0x1dc], 2

    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*)
}