rule APT_MAL_LNX_Turla_Apr202004_1 { 
   meta:
      description = "Detects Turla Linux malware x64 x32"
      date = "2020-04-24"
      author = "Leonardo S.p.A."
      reference = "https://www.leonardocompany.com/en/news-and-stories-detail/-/detail/knowledge-the-basis-of-protection"
      hash1 = "67d9556c695ef6c51abf6fbab17acb3466e3149cf4d20cb64d6d34dc969b6502" 
      hash2 = "8ccc081d4940c5d8aa6b782c16ed82528c0885bbb08210a8d0a8c519c54215bc" 
      hash3 = "8856a68d95e4e79301779770a83e3fad8f122b849a9e9e31cfe06bf3418fa667" 
      hash4 = "1d5e4466a6c5723cd30caf8b1c3d33d1a3d4c94c25e2ebe186c02b8b41daf905" 
      hash5 = "2dabb2c5c04da560a6b56dbaa565d1eab8189d1fa4a85557a22157877065ea08" 
      hash6 = "3e138e4e34c6eed3506efc7c805fce19af13bd62aeb35544f81f111e83b5d0d4" 
      hash7 = "5a204263cac112318cd162f1c372437abf7f2092902b05e943e8784869629dd8" 
      hash8 = "8856a68d95e4e79301779770a83e3fad8f122b849a9e9e31cfe06bf3418fa667" 
      hash9 = "d49690ccb82ff9d42d3ee9d7da693fd7d302734562de088e9298413d56b86ed0"
      id = "2da75433-b1c1-51b3-8f7a-a4442ca3de96"
   strings: 
      $ = "/root/.hsperfdata" ascii fullword
      $ = "Desc| Filename | size |state|" ascii fullword
      $ = "VS filesystem: %s" ascii fullword
      $ = "File already exist on remote filesystem !" ascii fullword 
      $ = "/tmp/.sync.pid" ascii fullword
      $ = "rem_fd: ssl " ascii fullword
      $ = "TREX_PID=%u" ascii fullword
      $ = "/tmp/.xdfg" ascii fullword
      $ = "__we_are_happy__" ascii
      $ = "/root/.sess" ascii fullword
      /* $ = "ZYSZLRTS^Z@@NM@@G_Y_FE" ascii fullword */
   condition:
      uint16(0) == 0x457f and filesize < 5000KB and
      4 of them
}

rule APT_MAL_LNX_Turla_Apr202004_1_opcode { 
   meta:
      description = "Detects Turla Linux malware x64 x32"
      date = "2020-04-24"
      author = "Leonardo S.p.A."
      reference = "https://www.leonardocompany.com/en/news-and-stories-detail/-/detail/knowledge-the-basis-of-protection"
      hash1 = "67d9556c695ef6c51abf6fbab17acb3466e3149cf4d20cb64d6d34dc969b6502" 
      hash2 = "8ccc081d4940c5d8aa6b782c16ed82528c0885bbb08210a8d0a8c519c54215bc" 
      hash3 = "8856a68d95e4e79301779770a83e3fad8f122b849a9e9e31cfe06bf3418fa667" 
      hash4 = "1d5e4466a6c5723cd30caf8b1c3d33d1a3d4c94c25e2ebe186c02b8b41daf905" 
      hash5 = "2dabb2c5c04da560a6b56dbaa565d1eab8189d1fa4a85557a22157877065ea08" 
      hash6 = "3e138e4e34c6eed3506efc7c805fce19af13bd62aeb35544f81f111e83b5d0d4" 
      hash7 = "5a204263cac112318cd162f1c372437abf7f2092902b05e943e8784869629dd8" 
      hash8 = "8856a68d95e4e79301779770a83e3fad8f122b849a9e9e31cfe06bf3418fa667" 
      hash9 = "d49690ccb82ff9d42d3ee9d7da693fd7d302734562de088e9298413d56b86ed0"
      id = "03043f59-c81a-5423-bec1-6cd88f6e3c52"
   strings:
      $op0 = { 8D 41 05 32 06 48 FF C6 88 81 E0 80 69 00 } /* Xor string loop_p1 x32*/ 
      $op1 = { 48FFC14883F94975E9 } /*Xorstringloop_p2x32*/
      $op2 = { C7 05 9B 7D 29 00 1D 00 00 00 C7 05 2D 7B 29 00 65 74 68 30 C6 05 2A 7B 29 00 00 E8 }
      /* Load eth0 interface*/
      $op3 = { BF FF FF FF FF E8 96 9D 0A 00 90 90 90 90 90 90 90 90 90 90 89 F0}
      /* Opcode exceptions*/ 
      $op4 = { 88D380C305329AC1D60C08889A60A10F084283FA0876E9 }
      /* Xor string loop x64*/
      $op5 = { 8B 8D 50 DF FF FF B8 09 00 00 00 89 44 24 04 89 0C 24 E8 DD E5 02 00 } /* Kill call x32 */ 
      $op6 = { 8D 5A 05 32 9A 60 26 0C 08 88 9A 20 F4 0E 08 42 83 FA 48 76 EB } /* Decrypt init str */ 
      $op7 = { 8D 4A 05 32 8A 25 26 0C 08 88 8A 20 F4 0E 08 42 83 FA 08 76 EB} /* Decrypt init str */
   condition:
      uint16(0) == 0x457f and filesize < 5000KB and
      2 of them
}