Search For Content
Search Result
182 item(s) found so far for this keyword.
Replication Through Removable Media
![Defense Evasion [Mitre] icon](/media/2024/04/08/icons8-burglar.svg){kind=small}
Adversaries may move onto systems, possibly those on disconnected or air-gapped networks, by copying malware to removable media and taking advantage of Autorun features when the media is inserted into a system and executes.
Read moreEvent Triggered Execution: Linux Inotify
Adversaries may establish persistence and/or elevate privileges using system mechanisms that trigger execution based on specific events. Various operating systems have means to monitor and subscribe to events such as logons or other user activity such as running specific applications/binaries.
Read moreXBEL Recently Opened Files Check
The recently-used.xbel XML file documents recent files on a Linux system that were accessed by applications. By parsing the file & checking how many files were recently accessed, we can determine whether or not a system is likely a sandbox or virtual machine. If a system has a low amount of files being accessed, it's likely a sandbox/VM.
Exfiltration via SMTP
Exfiltration via SMTP is a technique where attackers leverage the Simple Mail Transfer Protocol (SMTP) to exfiltrate data. This method involves sending stolen data, such as sensitive files or system information, via email to an attacker-controlled email account. By using email traffic, attackers can often bypass traditional network monitoring solutions since SMTP traffic is usually deemed legitimate.
To execute …
Read morekernel flag inspection via sysctl
The sysctl anti-debugging technique can be abused by malware to detect and evade debugging tools on macOS or BSD-like systems. By querying the kernel for process information, malware checks flags (e.g., 0x800) to see if a debugger is attached. If detected, the malware can terminate, alter behavior, or enter a dormant state to avoid analysis.
This technique blends …
Read moreClearing Kernel Message
The dmesg -C command clears the kernel message buffer, which stores diagnostic messages generated by the kernel. These messages include logs about hardware interactions, system events, kernel module loads, and errors such as segmentation faults. The attacker can run this command to make sure that no trace of kernel-related activity, including any anomalies caused by exploitation, remains in the message …
Manipulating Debug Logs
Using the sed -i command, specific entries in debug logs, such as errors (segfault, SystemError) or trace information (e.g., filenames like main.cc), are surgically removed. This allows attackers to target only incriminating evidence without erasing the entire log file. The process preserves the structure and authenticity of the log while removing key evidence of exploitation or system errors.
…
Read moreDeleting Troubleshoot Information and Core Dumps
Commands like rm -rf /data/var/statedumps/* and rm -rf /data/var/cores/* delete state dumps and core dumps, which are generated when processes crash. These files contain memory snapshots, stack traces, and runtime states of processes at the time of failure. They are often used to debug and understand the causes of crashes or application malfunctions.
Attackers use this technique to eliminate …
Read moreRemoving Commands from SELinux Audit Logs
SELinux audit logs record all executed commands and policy enforcement actions, including commands like /bin/web, setenforce, mount, and /bin/rm. Using sed -i, attackers delete specific entries from these logs that could reveal the commands they executed. This manipulation ensures that traces of their activity, such as disabling security policies or deleting evidence, are erased from …
WMI Event Subscriptions
Adversaries may leverage WMI event subscriptions to evade detection by triggering malicious actions only under specific conditions that are unlikely to occur in a sandboxed environment. For instance, a threat actor might configure an event subscription to monitor file system, network, or logon activity, ensuring that their second-stage payload is only downloaded and executed when a particular event suggests real …
Read more