rule SUSP_MAL_SigningCert_Feb24_1 {
   meta:
      description = "Detects PE files signed with a certificate used to sign malware samples mentioned in a HuntressLabs report on the exploitation of ScreenConnect vulnerability CVE-2024-1708 and CVE-2024-1709"
      author = "Florian Roth"
      reference = "https://www.huntress.com/blog/slashandgrab-screen-connect-post-exploitation-in-the-wild-cve-2024-1709-cve-2024-1708"
      date = "2024-02-23"
      score = 75
      hash1 = "37a39fc1feb4b14354c4d4b279ba77ba51e0d413f88e6ab991aad5dd6a9c231b"
      hash2 = "e8c48250cf7293c95d9af1fb830bb8a5aaf9cfb192d8697d2da729867935c793"
      id = "f25ea77a-1b4e-5c13-9117-eedf0c20335a"
   strings:
      $s1 = "Wisdom Promise Security Technology Co." ascii
      $s2 = "Globalsign TSA for CodeSign1" ascii
      $s3 = { 5D AC 0B 6C 02 5A 4B 21 89 4B A3 C2 }
   condition:
      uint16(0) == 0x5a4d
      and filesize < 70000KB
      and all of them
}

rule MAL_CS_Loader_Feb24_1 {
   meta:
      description = "Detects Cobalt Strike malware samples mentioned in a HuntressLabs report on the exploitation of ScreenConnect vulnerability CVE-2024-1708 and CVE-2024-1709"
      author = "Florian Roth"
      reference = "https://www.huntress.com/blog/slashandgrab-screen-connect-post-exploitation-in-the-wild-cve-2024-1709-cve-2024-1708"
      date = "2024-02-23"
      score = 75
      hash1 = "0a492d89ea2c05b1724a58dd05b7c4751e1ffdd2eab3a2f6a7ebe65bf3fdd6fe"
      id = "6c9914a4-b079-5a39-9d3b-7b9a2b54dc2b"
   strings:
      $s1 = "Dll_x86.dll" ascii fullword
   condition:
      uint16(0) == 0x5a4d
      and filesize < 1000KB
      and (
         pe.exports("UpdateSystem") and (
            pe.imphash() == "0dc05c4c21a86d29f1c3bf9cc5b712e0"
            or $s1
         )
      )
}

rule MAL_RANSOM_LockBit_Indicators_Feb24 {
   meta:
      description = "Detects Lockbit ransomware samples mentioned in a HuntressLabs report on the exploitation of ScreenConnect vulnerability CVE-2024-1708 and CVE-2024-1709"
      author = "Florian Roth"
      reference = "https://www.huntress.com/blog/slashandgrab-screen-connect-post-exploitation-in-the-wild-cve-2024-1709-cve-2024-1708"
      date = "2024-02-23"
      score = 75
      hash1 = "a50d9954c0a50e5804065a8165b18571048160200249766bfa2f75d03c8cb6d0"
      id = "108430c8-4fe5-58a1-b709-539b257c120c"
   strings:
      $op1 = { 76 c1 95 8b 18 00 93 56 bf 2b 88 71 4c 34 af b1 a5 e9 77 46 c3 13 }
      $op2 = { e0 02 10 f7 ac 75 0e 18 1b c2 c1 98 ac 46 }
      $op3 = { 8b c6 ab 53 ff 15 e4 57 42 00 ff 45 fc eb 92 ff 75 f8 ff 15 f4 57 42 00 }
   condition:
      uint16(0) == 0x5a4d
      and filesize < 500KB
      and (
         pe.imphash() == "914685b69f2ac2ff61b6b0f1883a054d"
         or 2 of them
      ) or all of them
}

rule MAL_MSI_Mpyutils_Feb24_1 {
   meta:
      description = "Detects malicious MSI package mentioned in a HuntressLabs report on the exploitation of ScreenConnect vulnerability CVE-2024-1708 and CVE-2024-1709"
      author = "Florian Roth"
      reference = "https://www.huntress.com/blog/slashandgrab-screen-connect-post-exploitation-in-the-wild-cve-2024-1709-cve-2024-1708"
      date = "2024-02-23"
      score = 70
      hash1 = "8e51de4774d27ad31a83d5df060ba008148665ab9caf6bc889a5e3fba4d7e600"
      id = "e7794336-a325-5b92-8c25-81ed9cb28044"
   strings:
      $s1 = "crypt64ult.exe" ascii fullword
      $s2 = "EXPAND.EXE" wide fullword
      $s6 = "ICACLS.EXE" wide fullword
   condition:
      uint16(0) == 0xcfd0
      and filesize < 20000KB
      and all of them
}

rule MAL_Beacon_Unknown_Feb24_1 {
   meta:
      description = "Detects malware samples mentioned in a HuntressLabs report on the exploitation of ScreenConnect vulnerability CVE-2024-1708 and CVE-2024-1709 "
      author = "Florian Roth"
      reference = "https://www.huntress.com/blog/slashandgrab-screen-connect-post-exploitation-in-the-wild-cve-2024-1709-cve-2024-1708"
      date = "2024-02-23"
      score = 75
      hash1 = "6e8f83c88a66116e1a7eb10549542890d1910aee0000e3e70f6307aae21f9090"
      hash2 = "b0adf3d58fa354dbaac6a2047b6e30bc07a5460f71db5f5975ba7b96de986243"
      hash3 = "c0f7970bed203a5f8b2eca8929b4e80ba5c3276206da38c4e0a4445f648f3cec"
      id = "9299fd44-5327-5a73-8299-108b710cb16e"
   strings:
      $s1 = "Driver.dll" wide fullword
      $s2 = "X l.dlT" ascii fullword
      $s3 = "$928c7481-dd27-8e23-f829-4819aefc728c" ascii fullword
   condition:
      uint16(0) == 0x5a4d
      and filesize < 2000KB
      and 3 of ($s*)
}