{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/token-obfuscation/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":["Windows"],"_cs_severities":["high"],"_cs_tags":["defense-evasion","token-obfuscation","powershell"],"_cs_type":"advisory","_cs_vendors":["Microsoft"],"content_html":"\u003cp\u003eAttackers are increasingly using PowerShell token obfuscation techniques to bypass security measures. This involves manipulating PowerShell command syntax to make it harder for security tools to identify malicious code. This technique leverages Invoke-Obfuscation, a known framework for obfuscating PowerShell scripts. This method allows malicious actors to disguise commands, such as downloading and executing arbitrary code, making traditional signature-based detections less effective. The use of token obfuscation highlights the need for more sophisticated detection strategies that focus on identifying anomalous behavior rather than relying solely on static code analysis. The scope of this threat is broad, as it can be incorporated into various attack vectors, from initial access to lateral movement.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eInitial Access: The attacker gains initial access through an undisclosed method (e.g., phishing, exploit).\u003c/li\u003e\n\u003cli\u003ePowerShell Execution: The attacker initiates a PowerShell process (powershell.exe).\u003c/li\u003e\n\u003cli\u003eToken Obfuscation: The attacker employs token obfuscation techniques, such as inserting backticks (\u003ccode\u003e), using string concatenation, or manipulating environment variables, to disguise malicious commands. Examples from the source include \u003c/code\u003eIN\u003ccode\u003eV\u003c/code\u003eo\u003ccode\u003eKe-eXp\u003c/code\u003eResSIOn\u003ccode\u003eand\u003c/code\u003e${e\u003ccode\u003eNv:pATh}\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eCommand Obfuscation: The obfuscated PowerShell command is executed, masking the intent of the command.\u003c/li\u003e\n\u003cli\u003ePayload Download: The obfuscated command may download a malicious payload from a remote server using methods such as \u003ccode\u003e(New-Object Net.WebClient).DownloadString\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eCode Execution: The downloaded payload is executed, potentially leading to further compromise of the system.\u003c/li\u003e\n\u003cli\u003ePersistence: The attacker may establish persistence through various methods.\u003c/li\u003e\n\u003cli\u003eLateral Movement/Exfiltration: Depending on the attacker\u0026rsquo;s objectives, they may move laterally within the network or exfiltrate sensitive data.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation using PowerShell token obfuscation can lead to complete system compromise, data theft, and disruption of services. The obfuscation techniques make it difficult for traditional security tools to detect and prevent the attack. The number of victims and sectors targeted is currently unknown, but the potential impact is significant due to the widespread use of PowerShell in enterprise environments.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the Sigma rule \u0026ldquo;Detect Powershell Token Obfuscation with Backticks\u0026rdquo; to identify PowerShell commands containing backtick-obfuscated tokens in \u003ccode\u003eprocess_creation\u003c/code\u003e logs.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule \u0026ldquo;Detect Powershell Token Obfuscation with String Concatenation\u0026rdquo; to identify PowerShell commands using string concatenation to obfuscate tokens in \u003ccode\u003eprocess_creation\u003c/code\u003e logs.\u003c/li\u003e\n\u003cli\u003eMonitor \u003ccode\u003eprocess_creation\u003c/code\u003e logs for PowerShell processes executing commands with environment variable manipulation, as described in the Sigma rules provided.\u003c/li\u003e\n\u003cli\u003eInvestigate any PowerShell processes that exhibit obfuscation techniques to determine if they are malicious.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2024-01-03T12:00:00Z","date_published":"2024-01-03T12:00:00Z","id":"/briefs/2024-01-powershell-token-obfuscation/","summary":"Adversaries employ token obfuscation techniques within PowerShell commands to evade detection by security tools, leveraging methods such as character insertion, string concatenation, and environment variable manipulation to mask their malicious intent.","title":"PowerShell Token Obfuscation via Process Creation","url":"https://feed.craftedsignal.io/briefs/2024-01-powershell-token-obfuscation/"}],"language":"en","title":"CraftedSignal Threat Feed — Token-Obfuscation","version":"https://jsonfeed.org/version/1.1"}