rule win_shylock_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2024-10-31"
        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 = "20241030"
        malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4"
        malpedia_version = "20241030"
        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 = { 50 b8???????? e8???????? 59 8bd8 51 54 }
            // n = 7, score = 500
            //   50                   | push                eax
            //   b8????????           |                     
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8bd8                 | mov                 ebx, eax
            //   51                   | push                ecx
            //   54                   | push                esp

        $sequence_1 = { ffb0b0000000 ffb0ac000000 e8???????? 83c410 85c0 0f849a060000 833d????????01 }
            // n = 7, score = 500
            //   ffb0b0000000         | push                dword ptr [eax + 0xb0]
            //   ffb0ac000000         | push                dword ptr [eax + 0xac]
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   85c0                 | test                eax, eax
            //   0f849a060000         | je                  0x6a0
            //   833d????????01       |                     

        $sequence_2 = { 8d85b0fdffff e8???????? 59 8b45fc 5f 5e 5b }
            // n = 7, score = 500
            //   8d85b0fdffff         | lea                 eax, [ebp - 0x250]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

        $sequence_3 = { 8d7318 e8???????? 8d7314 e8???????? 8d7310 e8???????? 8d730c }
            // n = 7, score = 500
            //   8d7318               | lea                 esi, [ebx + 0x18]
            //   e8????????           |                     
            //   8d7314               | lea                 esi, [ebx + 0x14]
            //   e8????????           |                     
            //   8d7310               | lea                 esi, [ebx + 0x10]
            //   e8????????           |                     
            //   8d730c               | lea                 esi, [ebx + 0xc]

        $sequence_4 = { e8???????? 8d75e0 e8???????? 8d75ec e8???????? 8d75f4 e8???????? }
            // n = 7, score = 500
            //   e8????????           |                     
            //   8d75e0               | lea                 esi, [ebp - 0x20]
            //   e8????????           |                     
            //   8d75ec               | lea                 esi, [ebp - 0x14]
            //   e8????????           |                     
            //   8d75f4               | lea                 esi, [ebp - 0xc]
            //   e8????????           |                     

        $sequence_5 = { 59 50 e8???????? 83c40c 8d75fc 8bf8 e8???????? }
            // n = 7, score = 500
            //   59                   | pop                 ecx
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8d75fc               | lea                 esi, [ebp - 4]
            //   8bf8                 | mov                 edi, eax
            //   e8????????           |                     

        $sequence_6 = { e9???????? 8b45f0 8d4de4 40 51 33d2 8d5df8 }
            // n = 7, score = 500
            //   e9????????           |                     
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   8d4de4               | lea                 ecx, [ebp - 0x1c]
            //   40                   | inc                 eax
            //   51                   | push                ecx
            //   33d2                 | xor                 edx, edx
            //   8d5df8               | lea                 ebx, [ebp - 8]

        $sequence_7 = { e8???????? 59 833d????????00 74ef e9???????? 8b0d???????? 83b93401000001 }
            // n = 7, score = 500
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   833d????????00       |                     
            //   74ef                 | je                  0xfffffff1
            //   e9????????           |                     
            //   8b0d????????         |                     
            //   83b93401000001       | cmp                 dword ptr [ecx + 0x134], 1

        $sequence_8 = { 8d75f0 e8???????? 8bc7 e8???????? 3c01 0f84d5020000 8d4dcc }
            // n = 7, score = 500
            //   8d75f0               | lea                 esi, [ebp - 0x10]
            //   e8????????           |                     
            //   8bc7                 | mov                 eax, edi
            //   e8????????           |                     
            //   3c01                 | cmp                 al, 1
            //   0f84d5020000         | je                  0x2db
            //   8d4dcc               | lea                 ecx, [ebp - 0x34]

        $sequence_9 = { 750a 6a01 8b7d88 e8???????? 0fb645e4 83f801 750a }
            // n = 7, score = 500
            //   750a                 | jne                 0xc
            //   6a01                 | push                1
            //   8b7d88               | mov                 edi, dword ptr [ebp - 0x78]
            //   e8????????           |                     
            //   0fb645e4             | movzx               eax, byte ptr [ebp - 0x1c]
            //   83f801               | cmp                 eax, 1
            //   750a                 | jne                 0xc

    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*)
}