rule win_shylock_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        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 = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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???????? 8bf0 59 59 85f6 7428 8b45fc }
            // n = 7, score = 500
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   85f6                 | test                esi, esi
            //   7428                 | je                  0x2a
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]

        $sequence_1 = { b8???????? e8???????? 59 50 8d5df8 e8???????? 8db500ffffff }
            // n = 7, score = 500
            //   b8????????           |                     
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   50                   | push                eax
            //   8d5df8               | lea                 ebx, [ebp - 8]
            //   e8????????           |                     
            //   8db500ffffff         | lea                 esi, [ebp - 0x100]

        $sequence_2 = { e8???????? 8bd8 e8???????? 8b7d08 8d5d10 8bf7 e8???????? }
            // n = 7, score = 500
            //   e8????????           |                     
            //   8bd8                 | mov                 ebx, eax
            //   e8????????           |                     
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   8d5d10               | lea                 ebx, [ebp + 0x10]
            //   8bf7                 | mov                 esi, edi
            //   e8????????           |                     

        $sequence_3 = { 8d45ec 8bce e8???????? e8???????? 8bf0 8d7df0 e8???????? }
            // n = 7, score = 500
            //   8d45ec               | lea                 eax, [ebp - 0x14]
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   8d7df0               | lea                 edi, [ebp - 0x10]
            //   e8????????           |                     

        $sequence_4 = { 84c0 eb08 837d0c00 7504 84c9 741d 8b4508 }
            // n = 7, score = 500
            //   84c0                 | test                al, al
            //   eb08                 | jmp                 0xa
            //   837d0c00             | cmp                 dword ptr [ebp + 0xc], 0
            //   7504                 | jne                 6
            //   84c9                 | test                cl, cl
            //   741d                 | je                  0x1f
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]

        $sequence_5 = { 3b5318 72e3 eb0c 8b55fc 8b1491 0355ec 8955f0 }
            // n = 7, score = 500
            //   3b5318               | cmp                 edx, dword ptr [ebx + 0x18]
            //   72e3                 | jb                  0xffffffe5
            //   eb0c                 | jmp                 0xe
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   8b1491               | mov                 edx, dword ptr [ecx + edx*4]
            //   0355ec               | add                 edx, dword ptr [ebp - 0x14]
            //   8955f0               | mov                 dword ptr [ebp - 0x10], edx

        $sequence_6 = { e8???????? 3b450c 7d8f ff7508 8bc1 e8???????? 33c0 }
            // n = 7, score = 500
            //   e8????????           |                     
            //   3b450c               | cmp                 eax, dword ptr [ebp + 0xc]
            //   7d8f                 | jge                 0xffffff91
            //   ff7508               | push                dword ptr [ebp + 8]
            //   8bc1                 | mov                 eax, ecx
            //   e8????????           |                     
            //   33c0                 | xor                 eax, eax

        $sequence_7 = { e8???????? 3c01 0f8496000000 8d85b0feffff 50 b8???????? e8???????? }
            // n = 7, score = 500
            //   e8????????           |                     
            //   3c01                 | cmp                 al, 1
            //   0f8496000000         | je                  0x9c
            //   8d85b0feffff         | lea                 eax, [ebp - 0x150]
            //   50                   | push                eax
            //   b8????????           |                     
            //   e8????????           |                     

        $sequence_8 = { c1ee10 0fafc2 895510 33d2 f7f3 8b450c 0fb7d8 }
            // n = 7, score = 500
            //   c1ee10               | shr                 esi, 0x10
            //   0fafc2               | imul                eax, edx
            //   895510               | mov                 dword ptr [ebp + 0x10], edx
            //   33d2                 | xor                 edx, edx
            //   f7f3                 | div                 ebx
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   0fb7d8               | movzx               ebx, ax

        $sequence_9 = { e8???????? 85c0 894710 0f9fc0 59 59 88470d }
            // n = 7, score = 500
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   894710               | mov                 dword ptr [edi + 0x10], eax
            //   0f9fc0               | setg                al
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   88470d               | mov                 byte ptr [edi + 0xd], al

    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*)
}