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#BadRabbit Yara Rule

a guest Oct 24th, 2017 2,212 Never
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  1. import "pe"
  2.  
  3. rule sig_8ebc97e05c8e1073bda2efb6f4d00ad7e789260afa2c276f0c72740b838a0a93 {
  4.    meta:
  5.       description = "Bad Rabbit Ransomware"
  6.       author = "Christiaan Beek"
  7.       reference = "BadRabbit"
  8.       date = "2017-10-24"
  9.       hash1 = "8ebc97e05c8e1073bda2efb6f4d00ad7e789260afa2c276f0c72740b838a0a93"
  10.    strings:
  11.       $x1 = "schtasks /Create /SC ONCE /TN viserion_%u /RU SYSTEM /TR \"%ws\" /ST %02d:%02d:00" fullword wide
  12.       $x2 = "need to do is submit the payment and get the decryption password." fullword ascii
  13.       $s3 = "If you have already got the password, please enter it below." fullword ascii
  14.       $s4 = "dispci.exe" fullword wide
  15.       $s5 = "\\\\.\\GLOBALROOT\\ArcName\\multi(0)disk(0)rdisk(0)partition(1)" fullword wide
  16.       $s6 = "Run DECRYPT app at your desktop after system boot" fullword ascii
  17.       $s7 = "Enter password#1: " fullword wide
  18.       $s8 = "Enter password#2: " fullword wide
  19.       $s9 = "C:\\Windows\\cscc.dat" fullword wide
  20.       $s10 = "schtasks /Delete /F /TN %ws" fullword wide
  21.       $s11 = "Password#1: " fullword ascii
  22.       $s12 = "\\AppData" fullword wide
  23.       $s13 = "Readme.txt" fullword wide
  24.       $s14 = "Disk decryption completed" fullword wide
  25.       $s15 = "Files decryption completed" fullword wide
  26.       $s16 = "http://diskcryptor.net/" fullword wide
  27.       $s17 = "Your personal installation key#1:" fullword ascii
  28.       $s18 = ".3ds.7z.accdb.ai.asm.asp.aspx.avhd.back.bak.bmp.brw.c.cab.cc.cer.cfg.conf.cpp.crt.cs.ctl.cxx.dbf.der.dib.disk.djvu.doc.docx.dwg." wide
  29.       $s19 = "Disable your anti-virus and anti-malware programs" fullword wide
  30.       $s20 = "bootable partition not mounted" fullword ascii
  31.    condition:
  32.       ( uint16(0) == 0x5a4d and
  33.         filesize < 400KB and
  34.         pe.imphash() == "94f57453c539227031b918edd52fc7f1" and
  35.         ( 1 of ($x*) or 4 of them )
  36.       ) or ( all of them )
  37. }
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