MOVEit Transfer (CVE-2023-34362)

title: MOVEit CVE-2023-34362 Exploitation Attempt - Potential Web Shell Request
id: 435e41f2-48eb-4c95-8a2b-ed24b50ec30b
status: test
description: Detects get requests to specific files used during the exploitation of MOVEit CVE-2023-34362
references:
    - https://community.progress.com/s/article/MOVEit-Transfer-Critical-Vulnerability-31May2023
    - https://www.mandiant.com/resources/blog/zero-day-moveit-data-theft
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-06-03
modified: 2023-07-28
tags:
    - attack.persistence
    - attack.t1505.003
    - cve.2023-34362
    - detection.emerging-threats
logsource:
    category: webserver
detection:
    selection:
        cs-method: 'GET'
        cs-uri-stem|contains:
            - '/human2.aspx'
            - '/_human2.aspx'
    condition: selection
falsepositives:
    - Unlikely
level: high

title: Potential MOVEit Transfer CVE-2023-34362 Exploitation - File Activity
id: c3b2a774-3152-4989-83c1-7afc48fd1599
status: test
description: Detects file indicators of potential exploitation of MOVEit CVE-2023-34362.
references:
    - https://www.bleepingcomputer.com/news/security/new-moveit-transfer-zero-day-mass-exploited-in-data-theft-attacks/
    - https://community.progress.com/s/article/MOVEit-Transfer-Critical-Vulnerability-31May2023
    - https://www.rapid7.com/blog/post/2023/06/01/rapid7-observed-exploitation-of-critical-moveit-transfer-vulnerability/
    - https://www.reddit.com/r/sysadmin/comments/13wxuej/comment/jmhdg55/
author: Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
date: 2023-06-01
modified: 2024-08-13
tags:
    - attack.initial-access
    - attack.t1190
    - cve.2023-34362
    - detection.emerging-threats
logsource:
    category: file_event
    product: windows
detection:
    selection_generic:
        TargetFilename|contains:
            - '\MOVEit Transfer\wwwroot\'
            - '\MOVEitTransfer\wwwroot\'
        TargetFilename|endswith:
            - '.7z'
            - '.bat'
            - '.dll'
            - '.exe'
            - '.ps1'
            - '.rar'
            - '.vbe'
            - '.vbs'
            - '.zip'
    selection_known_ioc:
        TargetFilename|endswith:
            - '\MOVEit Transfer\wwwroot\_human2.aspx.lnk'
            - '\MOVEit Transfer\wwwroot\_human2.aspx'
            - '\MOVEit Transfer\wwwroot\human2.aspx.lnk'
            - '\MOVEit Transfer\wwwroot\human2.aspx'
            - '\MOVEitTransfer\wwwroot\_human2.aspx.lnk'
            - '\MOVEitTransfer\wwwroot\_human2.aspx'
            - '\MOVEitTransfer\wwwroot\human2.aspx.lnk'
            - '\MOVEitTransfer\wwwroot\human2.aspx'
    # Uncomment selection if you wanna threat hunt for additional artifacts
    # selection_cmdline:
    #    TargetFilename|contains: ':\Windows\TEMP\'
    #    TargetFilename|endswith: '.cmdline'
    selection_compiled_asp:
        CreationUtcTime|startswith:
            - '2023-03- '
            - '2023-04- '
            - '2023-05- '
            - '2023-06- '
        TargetFilename|contains|all:
            - '\Windows\Microsoft.net\Framework64\v'
            - '\Temporary ASP.NET Files\'
            - 'App_Web_'
        TargetFilename|endswith: '.dll'
    condition: 1 of selection_*
falsepositives:
    - To avoid FP, this rule should only be applied on MOVEit servers.
level: high

title: Potential MOVEit Transfer CVE-2023-34362 Exploitation - Dynamic Compilation Via Csc.EXE
id: 39ac1fb0-07f1-474b-b97e-c5c0eace0d79
status: test
description: |
    Detects the execution of "csc.exe" via "w3wp.exe" process. MOVEit affected hosts execute "csc.exe" via the "w3wp.exe" process to dynamically compile malicious DLL files.

    MOVEit is affected by a critical vulnerability. Exploited hosts show evidence of dynamically compiling a DLL and writing it under C:\\Windows\\Microsoft\.NET\\Framework64\\v4\.0\.30319\\Temporary ASP\.NET Files\\root\\([a-z0-9]{5,12})\\([a-z0-9]{5,12})\\App_Web_[a-z0-9]{5,12}\.dll.

    Hunting Opportunity

    Events from IIS dynamically compiling binaries via the csc.exe on behalf of the MOVEit application, especially since May 27th should be investigated.
references:
    - https://www.huntress.com/blog/moveit-transfer-critical-vulnerability-rapid-response
    - https://www.trustedsec.com/blog/critical-vulnerability-in-progress-moveit-transfer-technical-analysis-and-recommendations/
author: '@kostastsale'
date: 2023-06-01
tags:
    - attack.execution
    - attack.t1059
    - cve.2023-34362
    - detection.emerging-threats
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        ParentImage|endswith: '\w3wp.exe'
        ParentCommandLine|contains: 'moveitdmz pool'
        Image|endswith: '\csc.exe'
    condition: selection
falsepositives:
    - Initial software installation and software updates.
level: medium

| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
as lastTime FROM datamodel=Endpoint.Filesystem where
  Filesystem.file_path IN ("*\\MOVEitTransfer\\wwwroot\\*") AND
  Filesystem.file_name IN("*.ashx", "*.asp*")
by Filesystem.action Filesystem.dest Filesystem.file_access_time Filesystem.file_create_time
Filesystem.file_hash Filesystem.file_modify_time Filesystem.file_name Filesystem.file_path
Filesystem.file_acl Filesystem.file_size Filesystem.process_guid Filesystem.process_id
Filesystem.user Filesystem.vendor_product
| `drop_dm_object_name(Filesystem)`
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `windows_moveit_transfer_writing_aspx_filter`

W3CIISLog
| where TimeGenerated > ago(30d)
| where csUriStem has_any ("/human2.aspx", "/_human2.aspx")
| summarize Count = count(), FirstSeen = min(TimeGenerated), LastSeen = max(TimeGenerated) by cIP, csMethod, csUriStem, scStatus

#event_simpleName=/^(NewScriptWritten|WebScriptFileWritten)$/ event_platform=Win
| FileName=/^_?human2\.aspx$/i
| groupBy([aid, ComputerName, TargetFileName], limit=max)

alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET WEB_SPECIFIC_APPS MOVEit File Transfer - Trigger SQL Injection via guestaccess.aspx - CVE-2023-34362 Stage 2"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/guestaccess.aspx"; fast_pattern; http.request_body; content:"transaction"; nocase; content:"secmsgpost"; within:20; content:"CsrfToken"; nocase; reference:url,www.horizon3.ai/moveit-transfer-cve-2023-34362-deep-dive-and-indicators-of-compromise/; reference:url,attackerkb.com/topics/mXmV0YpC3W/cve-2023-34362/rapid7-analysis; reference:cve,2023-34362; classtype:attempted-admin; sid:2046192; rev:1; metadata:attack_target Web_Server, created_at 2023_06_12, cve CVE_2023_34362, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, tag CISA_KEV, updated_at 2023_06_12, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)

rule WEBSHELL_ASPX_MOVEit_Jun23_1 {
   meta:
      description = "Detects ASPX web shells as being used in MOVEit Transfer exploitation"
      author = "Florian Roth"
      reference = "https://www.rapid7.com/blog/post/2023/06/01/rapid7-observed-exploitation-of-critical-moveit-transfer-vulnerability/"
      date = "2023-06-01"
      score = 85
      hash1 = "2413b5d0750c23b07999ec33a5b4930be224b661aaf290a0118db803f31acbc5"
      hash2 = "48367d94ccb4411f15d7ef9c455c92125f3ad812f2363c4d2e949ce1b615429a"
      hash3 = "e8012a15b6f6b404a33f293205b602ece486d01337b8b3ec331cd99ccadb562e"
      id = "2c789b9c-5ec5-5fd1-84e3-6bf7735a9488"
   strings:
      $s1 = "X-siLock-Comment" ascii fullword   
      $s2 = "]; string x = null;" ascii
      $s3 = ";  if (!String.Equals(pass, " ascii
   condition:
      filesize < 150KB and 2 of them
}