rule win_shylock_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        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 = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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???????? 83c40c 89b5b4feffff e8???????? 8945ec 8d85b4feffff 50 }
            // n = 7, score = 500
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   89b5b4feffff         | mov                 dword ptr [ebp - 0x14c], esi
            //   e8????????           |                     
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   8d85b4feffff         | lea                 eax, [ebp - 0x14c]
            //   50                   | push                eax

        $sequence_1 = { e9???????? ff7520 e8???????? 50 e8???????? 59 59 }
            // n = 7, score = 500
            //   e9????????           |                     
            //   ff7520               | push                dword ptr [ebp + 0x20]
            //   e8????????           |                     
            //   50                   | push                eax
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx

        $sequence_2 = { e8???????? 59 57 89bb5c010000 e8???????? 33c0 59 }
            // n = 7, score = 500
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   57                   | push                edi
            //   89bb5c010000         | mov                 dword ptr [ebx + 0x15c], edi
            //   e8????????           |                     
            //   33c0                 | xor                 eax, eax
            //   59                   | pop                 ecx

        $sequence_3 = { b8???????? e8???????? 59 8d45d0 50 8d5df8 e8???????? }
            // n = 7, score = 500
            //   b8????????           |                     
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8d45d0               | lea                 eax, [ebp - 0x30]
            //   50                   | push                eax
            //   8d5df8               | lea                 ebx, [ebp - 8]
            //   e8????????           |                     

        $sequence_4 = { 8d45fc e8???????? 8945f8 3bc6 7507 8b450c 8930 }
            // n = 7, score = 500
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   e8????????           |                     
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   3bc6                 | cmp                 eax, esi
            //   7507                 | jne                 9
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   8930                 | mov                 dword ptr [eax], esi

        $sequence_5 = { 8b4508 85c0 742c 83781c00 7426 8b501c 8b4d0c }
            // n = 7, score = 500
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   85c0                 | test                eax, eax
            //   742c                 | je                  0x2e
            //   83781c00             | cmp                 dword ptr [eax + 0x1c], 0
            //   7426                 | je                  0x28
            //   8b501c               | mov                 edx, dword ptr [eax + 0x1c]
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]

        $sequence_6 = { ff75ac 8b45f8 e8???????? 8945a8 8b75f8 e8???????? 8d45a8 }
            // n = 7, score = 500
            //   ff75ac               | push                dword ptr [ebp - 0x54]
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   e8????????           |                     
            //   8945a8               | mov                 dword ptr [ebp - 0x58], eax
            //   8b75f8               | mov                 esi, dword ptr [ebp - 8]
            //   e8????????           |                     
            //   8d45a8               | lea                 eax, [ebp - 0x58]

        $sequence_7 = { c1e104 c1eb04 0bd9 8a0c3b 884a01 83f801 7614 }
            // n = 7, score = 500
            //   c1e104               | shl                 ecx, 4
            //   c1eb04               | shr                 ebx, 4
            //   0bd9                 | or                  ebx, ecx
            //   8a0c3b               | mov                 cl, byte ptr [ebx + edi]
            //   884a01               | mov                 byte ptr [edx + 1], cl
            //   83f801               | cmp                 eax, 1
            //   7614                 | jbe                 0x16

        $sequence_8 = { e8???????? 8d75a4 e8???????? 8d75d4 e8???????? 8d759c e8???????? }
            // n = 7, score = 500
            //   e8????????           |                     
            //   8d75a4               | lea                 esi, [ebp - 0x5c]
            //   e8????????           |                     
            //   8d75d4               | lea                 esi, [ebp - 0x2c]
            //   e8????????           |                     
            //   8d759c               | lea                 esi, [ebp - 0x64]
            //   e8????????           |                     

        $sequence_9 = { ff5608 8d75f0 e8???????? 51 8bf4 68???????? e8???????? }
            // n = 7, score = 500
            //   ff5608               | call                dword ptr [esi + 8]
            //   8d75f0               | lea                 esi, [ebp - 0x10]
            //   e8????????           |                     
            //   51                   | push                ecx
            //   8bf4                 | mov                 esi, esp
            //   68????????           |                     
            //   e8????????           |                     

    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*)
}