Merge pull request #256 from mikesxrs/patch-3

Creating ransomware_PetrWrap.yar

malware/RANSOM_PetrWrap.yar

+rule ransomware_PetrWrap 
+{
+meta:
+	copyright= "Kaspersky Lab"
+	description = "Rule to detect PetrWrap ransomware samples"
+    reference = "https://securelist.com/schroedingers-petya/78870/"
+	last_modified = "2017-06-27"
+	author = "Kaspersky Lab"
+	hash = "71B6A493388E7D0B40C83CE903BC6B04"
+	version = "1.0"
+strings:
+	$a1 = "MIIBCgKCAQEAxP/VqKc0yLe9JhVqFMQGwUITO6WpXWnKSNQAYT0O65Cr8PjIQInTeHkXEjfO2n2JmURWV/uHB0ZrlQ/wcYJBwLhQ9EqJ3iDqmN19Oo7NtyEUmbYmopcqYLIBZzQ2ZTK0A2DtX4GRKxEEFLCy7vP12EYOPXknVy/mf0JFWixz29QiTf5oLu15wVLONCuEibGaNNpgqCXsPwfITDbDDmdrRIiUEUw6o3pt5pNOskfOJbMan2TZu" fullword wide
+	$a2 = ".3ds.7z.accdb.ai.asp.aspx.avhd.back.bak.c.cfg.conf.cpp.cs.ctl.dbf.disk.djvu.doc.docx.dwg.eml.fdb.gz.h.hdd.kdbx.mail.mdb.msg.nrg.ora.ost.ova.ovf.pdf.php.pmf.ppt.pptx.pst.pvi.py.pyc.rar.rtf.sln.sql.tar.vbox.vbs.vcb.vdi.vfd.vmc.vmdk.vmsd.vmx.vsdx.vsv.work.xls" fullword wide
+	$a3 = "DESTROY ALL OF YOUR DATA PLEASE ENSURE THAT YOUR POWER CABLE IS PLUGGED" fullword ascii
+	$a4 = "1Mz7153HMuxXTuR2R1t78mGSdzaAtNbBWX" fullword ascii
+	$a5 = "wowsmith123456posteo.net." fullword wide
+condition:
+	uint16(0) == 0x5A4D and filesize < 1000000 and any of them 
+}