CCNA Analyzing Volatile and Windows Event Artifacts Questions

A key length of 0 in an NTLM authentication event is a strong indicator of NTLMv1 usage or a failure to negotiate session security. This is critical for forensic analysts because NTLMv1 is cryptographically weak, and its presence often signals that an attacker is attempting to downgrade the authentication protocol.

UserAssist stores a record of applications executed by a specific user through the Windows shell. It tracks the name, path, execution count, and the last time it was run. It is a highly reliable source for forensic analysts needing to prove that a user interacted with a specific piece of software.

Decoding the base64 string is the only way to reveal the underlying PowerShell script executed by the attacker. This allows the analyst to see the actual commands, identify the targeted actions, and determine the scope of the incident, which is essential for creating an effective remediation plan for the compromised host.

windows.pstree walks the ActiveProcessLinks list and prints each process with its PID, PPID, image name, and offset, rendering an indented tree. This directly exposes parent-child relationships at capture time, letting you tie a suspicious child to the process that spawned it and, by cross-referencing windows.getsids or windows.cmdline, to the launching user context.

When the Windows Event Log service clears a log, it writes Event ID 104 to the System log, recording which log was cleared and by which user. Even if the Security log itself is emptied, this System log entry persists unless the System log is also cleared, making it a reliable indicator of log tampering.

The malfind plugin scans process memory for regions that are both executable and writable, and that do not map to a file on disk. It then displays the start address of threads within those regions, which is a strong indicator of injected code. This directly addresses the requirement to find threads starting outside legitimate modules.

The USBSTOR key in the SYSTEM hive records USB mass storage devices and, within each device instance, the Properties subkey holds timestamps such as the first and last connection times. This makes it the correct artifact for determining when a USB device was last connected to the system.

The ShimCache entry contains the full file path and, on Windows 8 and later, a last modified timestamp from the file's $STANDARD_INFORMATION attribute. This timestamp indicates when the file was last modified, not when it was executed. However, the presence of a path in ShimCache confirms the file existed on the system at some point, which is valuable for identifying deleted executables. This makes it the correct choice for determining file existence and last modification time.

Shellbags are stored in the user-specific NTUSER.DAT registry hive. They track folder access, directory view settings, and navigation history. This registry key is the authoritative source for reconstructing a user's interaction with the file system, providing key evidence of which folders were browsed during the period of interest.

The Task Scheduler stores each task as an XML file under C:\Windows\System32\Tasks, named after the task path. That XML contains the Actions (the executable and arguments) and Triggers, including logon triggers, so examining it directly reveals the suspicious binary and the logon trigger configured for persistence.

Event ID 4688 is written to the Security log when a new process is created, and with process creation auditing enabled it records the New Process Name and often the command line. It is generated at the moment of execution and does not depend on Prefetch or ShimCache, making it the strongest independent proof that the specific executable ran.

windows.pslist walks the active process list (PsActiveProcessHead) to enumerate processes that were active at the time of capture. It provides a list of processes with their PIDs, PPIDs, and other details, but it may miss processes that have terminated or are hidden.

Malfind specifically scans for VAD nodes marked as PAGE_EXECUTE_READWRITE that lack an associated mapped file. This is the primary signature of injected code or hollowed processes where attackers have manually allocated memory to house malicious payloads. It provides the necessary visibility into anomalous memory protections within target processes.

Event ID 4624 in the Security log records successful logon attempts. Logon Type 2 indicates an interactive logon at the console. By filtering for Event ID 4624 and Logon Type 2, an analyst can identify the most recent interactive logon. This is the correct source for determining when a user last logged on interactively.

Svchost.exe is a critical system process that should always be spawned by services.exe. If the PPID does not match the process ID of services.exe, it strongly suggests that the process is a masquerading binary or has been launched by an unauthorized actor, even if the path appears correct.

This log file specifically captures WMI events, including requests, queries, and process creation triggered by the WMI service. It is the most direct artifact for identifying malicious WMI activity, providing the necessary evidence to confirm that an attacker utilized this specific management interface for remote code execution.

Checking the digital signature verifies whether the executable is signed by Microsoft and has not been tampered with. A legitimate svchost.exe should be signed by Microsoft and reside in System32. If the signature is invalid or missing, it indicates a masquerading attempt, directly addressing the analyst's need to verify integrity and origin.

The cmdline plugin specifically retrieves the command-line arguments from the process's PEB (Process Environment Block). This provides the full string used to start the process, which often includes malicious paths, obfuscated arguments, or external command-and-control parameters that are vital for forensic analysis of the execution.

Executable memory regions that are marked as Read-Write-Execute (RWX) are highly suspicious. Legitimate processes rarely require memory to be writable and executable simultaneously. Attackers often use these permissions to write shellcode to a buffer and then execute it, making this a primary indicator of process injection.

windows.handles enumerates the handle table of each process and shows the object type and object name. Filtering for lsass.exe reveals which processes held handles to the LSASS process object, providing direct evidence of access at capture time. This is the most targeted way to identify a process that opened LSASS for memory access.

TCP Endpoint structures in memory store the state of all active and listening network connections, including the associated process ID. By parsing these structures from a memory dump, an analyst can definitively link network traffic to a specific, potentially malicious process, regardless of whether the connection is hidden from standard OS tools.

Event ID 6006 in the System log indicates that the event log service was stopped, which occurs during a clean shutdown. It is a reliable indicator of a graceful system shutdown. The timestamp of this event provides the time the shutdown process completed. This is the standard event used to determine shutdown time.

The Logon Process and Authentication Package fields distinguish a network logon initiated by a service (for example, NTLM or Kerberos via a service host) from an interactive or explicit credential use. A mismatch, such as an unexpected authentication package or logon process for that account, is a strong indicator of credential misuse for lateral movement rather than normal service behavior.

This policy, when enabled, configures Windows to include the full command line in Event ID 4688 process creation events. Without it, the command line field is blank. Enabling it ensures future events capture this critical detail for forensic analysis.

Event ID 4688 records the creation of a new process and includes the creator process name. Here, cmd.exe is the creator of powershell.exe. This parent-child relationship is a common technique in malicious scripts, such as those used in fileless attacks or lateral movement. It does not prove maliciousness but is a suspicious pattern that warrants further investigation. This option accurately describes the event.

Event ID 4624 is logged when a logon attempt succeeds. It includes the logon type, which indicates the type of logon (e.g., interactive, network, batch). For interactive logons, the logon type is 2 (Interactive) or 10 (RemoteInteractive). By filtering for these logon types and the specific user, the analyst can determine the last interactive logon time.

In Windows, when a parent process terminates, its child processes are not terminated. The PPID of a child remains pointing to the now-defunct parent PID. Since PID 1234 is not in the active process list, it likely terminated, leaving a stale PPID. This is a common forensic artifact and does not necessarily indicate malicious activity.

The windows.vadinfo plugin lists virtual address descriptors (VADs) for a process, showing memory regions and their protections. It helps identify unusual memory allocations, such as those with execute permissions that are not backed by a file, which are indicative of injected code. It complements malfind by providing detailed VAD information.

In process hollowing, the original executable is created in a suspended state, its memory is unmapped, and malicious code is injected. The in-memory image path (from the PEB) may still point to the original file, but the actual code in memory is different. A mismatch between the in-memory image path and the on-disk file path, or a discrepancy in the code, is a strong indicator. This is often detected by comparing the in-memory module with the disk file.

windows.threads lists all threads for a given process, including thread IDs, start addresses, and stack information. This allows an analyst to identify threads whose start addresses fall outside the normal module range, which is a strong indicator of code injection. It directly addresses the requirement to examine threads and their start addresses in volatile memory, making it the correct choice.

Event ID 4104 in the Windows PowerShell operational log records the actual script block text when Script Block Logging is enabled. This directly captures the PowerShell code that was executed, including obfuscated or dynamically generated content, making it the most direct source for reconstructing the malicious script block. It is not enabled by default, so its presence indicates prior configuration.

Event ID 4624 with Logon Type 2 indicates an interactive logon at the console, recorded in the Security log at the moment the session was established. In this scenario it directly ties a specific account to a physical or console session, making it the most reliable artifact for confirming who was actively logged in at the time of the incident.

Event ID 4104 logs the script block content executed by the PowerShell engine. This is the primary event for forensic analysis of PowerShell activity, as it captures the full script, including base64-encoded commands, allowing analysts to decode and analyze the malicious logic used in fileless attacks.

The Windows Console Host (conhost.exe) maintains a history buffer of commands entered in a command prompt window. This buffer resides in the memory of the conhost.exe process associated with the console session. Extracting this buffer from a memory image can reveal recently typed commands that may not be recorded in any persistent log, making it a valuable volatile artifact for user activity.

A legitimate Windows system binary like svchost.exe will be signed by Microsoft. If the file in the AppData directory is unsigned, or if the signature is invalid, it is a definitive indicator that the file is not the genuine system binary, regardless of its filename or location.

windows.vadinfo dumps the virtual address descriptor tree for a process, showing each region's protection, commit type, and backing file. When combined with malfind, it lets you characterize the injected region by confirming whether it is private, executable, and fileless, which is essential for describing the injection in this scenario.