YARA Detection Rule: APT_MAL_CN_Unit78020_Sep15
Repository: Neo23x0/signature-base
Detects: Detects malware used by Unit78020
Author: Florian Roth (Nextron Systems)
Reference: http://threatconnect.com/camerashy/?utm_campaign=CameraShy

Pattern signatures:
$x1 = "greensky27.vicp.net" fullword wide
      $x2 = "POST http://%s:%d/aspxabcdefg.asp?%s HTTP/1.1" fullword ascii
      $x3 = "GET http://%s:%d/aspxabcdef.asp?%s HTTP/1.1" fullword ascii
      /* additional strings based on PDF report - not found in samples */
      $x4 = "serch.vicp.net" fullword wide
      $x5 = "greensky27.vicp.net" fullword wide
      $x6 = "greensky27.vicp.net.as" fullword wide
      $x7 = "greensky27.vcip.net" fullword wide
      $x8 = "pnoc-ec.vicp.net" fullword wide
      $x9 = "aseanph.vicp.net" fullword wide
      $x10 = "pnoc.vicp.net" fullword wide
      
      $sa1 = "dMozilla/4.0 (compatible; MSIE 6.0;Windows NT 5.0; .NET CLR 1.1.4322)" wide fullword
      $sa2 = "x-www-form-urlencoded/r/n" wide fullword
      $sa3 = "/%d%s%d" ascii fullword
      $sa4 = "dMozilla" wide fullword
      $sa5 = "Accept-Language:En-us" wide fullword

      $sb1 = "%USERPROFILE%\\Application Data\\Mozilla\\Firefox\\Profiles" wide fullword
      $sb2 = "\\Office Start.lnk" w

Detection condition:
uint16(0) == 0x5a4d and
      filesize < 2000KB and (
         1 of ($x*) or 
         all of ($sa*) or 
         all of ($sb*) or
         all of ($sc*)
      )

Full rule:
rule APT_MAL_CN_Unit78020_Sep15 {
   meta:
      description = "Detects malware used by Unit78020"
      author = "Florian Roth (Nextron Systems)"
      reference = "http://threatconnect.com/camerashy/?utm_campaign=CameraShy"
      date = "2015-09-24"
      modified = "2023-01-31"
      score = 80
      old_rule_name = "Unit78020_Malware_Gen1"
      hash1 = "2b15e614fb54bca7031f64ab6caa1f77b4c07dac186826a6cd2e254090675d72"
      hash2 = "76c586e89c30a97e583c40ebe3f4ba75d5e02e52959184c4ce0a46b3aac54edd"
      hash3 = "7b73bf2d80a03eb[PII_REDACTED]28da79924fbe06cc67c4dcdd2bdefccd6e0e1af"
      hash4 = "2625a0d91d3cdbbc7c4a450c91e028e3609ff96c4f2a5a310ae20f73e1bc32ac"
      hash5 = "5c62b1d16e6180f22a0cb59c99a7743f44cb4a41e4e090b9733d1fb687c8efa2"
      hash6 = "88c5be84afe20c91e[PII_REDACTED]bafb044f98aa5fbf8c9f9997758a014238790"
      id = "d26d401f-3806-5a0b-bdb3-87d5d8af209c"
   strings:
      $x1 = "greensky27.vicp.net" fullword wide
      $x2 = "POST http://%s:%d/aspxabcdefg.asp?%s HTTP/1.1" fullword ascii
      $x3 = "GET http://%s:%d/aspxabcdef.asp?%s HTTP/1.1" fullword ascii
      /* additional strings based on PDF report - not found in samples */
      $x4 = "serch.vicp.net" fullword wide
      $x5 = "greensky27.vicp.net" fullword wide
      $x6 = "greensky27.vicp.net.as" fullword wide
      $x7 = "greensky27.vcip.net" fullword wide
      $x8 = "pnoc-ec.vicp.net" fullword wide
      $x9 = "aseanph.vicp.net" fullword wide
      $x10 = "pnoc.vicp.net" fullword wide
      
      $sa1 = "dMozilla/4.0 (compatible; MSIE 6.0;Windows NT 5.0; .NET CLR 1.1.4322)" wide fullword
      $sa2 = "x-www-form-urlencoded/r/n" wide fullword
      $sa3 = "/%d%s%d" ascii fullword
      $sa4 = "dMozilla" wide fullword
      $sa5 = "Accept-Language:En-us" wide fullword

      $sb1 = "%USERPROFILE%\\Application Data\\Mozilla\\Firefox\\Profiles" wide fullword
      $sb2 = "\\Office Start.lnk" wide fullword
      $sb3 = "%02d-%02d-%02d %02d:%02d" wide fullword

      $sc1 = "\\MSN Talk Start.l