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analyzing-lnk-file-and-jump-list-artifacts Analyze Windows LNK shortcut files and Jump List artifacts to establish evidence of file access, program execution, and user activity using LECmd, JLECmd, and manual binary parsing of the Shell Link Binary format. Use when analyzeing windows lnk shortcut files and jump list artifacts to.
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下载 Zip 下载中... name analyzing-lnk-file-and-jump-list-artifacts description Analyze Windows LNK shortcut files and Jump List artifacts to establish evidence of file access, program execution, and user activity using LECmd, JLECmd, and manual binary parsing of the Shell Link Binary format. Use when analyzeing windows lnk shortcut files and jump list artifacts to. domain cybersecurity subdomain digital-forensics tags ["lnk-files","jump-lists","lecmd","jlecmd","windows-forensics","shell-link","user-activity","file-access","program-execution","recent-files"] version 1.0 author oyi77 license Apache-2.0 nist_csf ["RS.AN-01","RS.AN-03","DE.AE-02","RS.MA-01"]
Analyzing LNK File and Jump List Artifacts
Overview
Windows LNK (shortcut) files and Jump Lists are critical forensic artifacts that provide evidence of file access, program execution, and user behavior. LNK files are created automatically when a user opens a file through Windows Explorer or the Open/Save dialog, storing metadata about the target file including its original path, timestamps, volume serial number, NetBIOS name, and MAC address of the host system. Jump Lists, introduced in Windows 7, extend this by maintaining per-application lists of recently and frequently accessed files. These artifacts persist even after the target files are deleted, making them invaluable for establishing that a user accessed specific files at specific times.
When to Use
Trigger phrases:
"analyzing lnk file and jump list artifacts"
"Analyze Windows LNK shortcut files and Jump List artifacts to establish evidence"
When investigating security incidents that require analyzing lnk file and jump list artifacts
When building detection rules or threat hunting queries for this domain
When SOC analysts need structured procedures for this analysis type
When validating security monitoring coverage for related attack techniques
Prerequisites
LECmd (Eric Zimmerman) for LNK file parsing
JLECmd (Eric Zimmerman) for Jump List parsing
Python 3.8+ with pylnk3 or LnkParse3 libraries
Forensic image or triage collection from Windows system
Timeline Explorer for CSV analysis
LNK File Locations
Location Description %USERPROFILE%\AppData\Roaming\Microsoft\Windows\Recent\Recent files accessed %USERPROFILE%\Desktop\User-created shortcuts %USERPROFILE%\AppData\Roaming\Microsoft\Windows\Start Menu\Start Menu shortcuts %USERPROFILE%\AppData\Roaming\Microsoft\Office\Recent\Office recent documents
LNK File Structure
This section covers lnk file structure for analyzing lnk file and jump list artifacts.
Ensure all prerequisites are met before proceeding
Follow the documented workflow steps in sequence
Record results and any anomalies encountered during this phase
Shell Link Header (76 bytes) Offset Size Field 0x00 4 HeaderSize (always 0x0000004C) 0x04 16 LinkCLSID (always 00021401-0000-0000-C000-000000000046) 0x14 4 LinkFlags 0x18 4 FileAttributes 0x1C 8 CreationTime (FILETIME) 0x24 8 AccessTime (FILETIME) 0x2C 8 WriteTime (FILETIME) 0x34 4 FileSize of target 0x38 4 IconIndex 0x3C 4 ShowCommand 0x40 2 HotKey
Key Forensic Fields in LNK Files
Target file timestamps : Creation, access, modification times of the referenced fileVolume information : Serial number, drive type, volume labelNetwork share information : UNC path, share nameMachine identifiers : NetBIOS name, MAC address (from TrackerDataBlock)Distributed Link Tracking : Machine ID and object GUID
Analysis with EZ Tools Tool Purpose Autopsy Open-source digital forensics platform for disk image analysis FTK Imager Forensic imaging and evidence preview tool Volatility Memory forensics framework for RAM analysis dcfldd Enhanced dd with built-in hashing for forensic acquisition
LECmd - LNK File Parser # Parse all LNK files in Recent folder
LECmd.exe -d "C:\Evidence\Users\suspect\AppData\Roaming\Microsoft\Windows\Recent" --csv C:\Output --csvf lnk_analysis.csv
# Parse a single LNK file with full details
LECmd.exe -f "C:\Evidence\Users\suspect\Desktop\Confidential.docx.lnk" --json C:\Output
# Parse LNK files with additional detail levels
LECmd.exe -d "C:\Evidence\Users\suspect\AppData\Roaming\Microsoft\Windows\Recent" --csv C:\Output --csvf lnk_all.csv --all
JLECmd - Jump List Parser # Parse Automatic Jump Lists
JLECmd.exe -d "C:\Evidence\Users\suspect\AppData\Roaming\Microsoft\Windows\Recent\AutomaticDestinations" --csv C:\Output --csvf jumplists_auto.csv
# Parse Custom Jump Lists
JLECmd.exe -d "C:\Evidence\Users\suspect\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations" --csv C:\Output --csvf jumplists_custom.csv
# Parse all jump lists with detailed output
JLECmd.exe -d "C:\Evidence\Users\suspect\AppData\Roaming\Microsoft\Windows\Recent\AutomaticDestinations" --csv C:\Output --csvf jumplists_auto.csv --ld
Jump List Structure This section covers jump list structure for analyzing lnk file and jump list artifacts.
Ensure all prerequisites are met before proceeding
Follow the documented workflow steps in sequence
Record results and any anomalies encountered during this phase
Automatic Destinations (automaticDestinations-ms) These are OLE Compound files (Structured Storage) identified by AppID hash in the filename:
AppID Hash Application 5f7b5f1e01b83767 Windows Explorer Pinned/Frequent 1b4dd67f29cb1962 Windows Explorer Recent 9b9cdc69c1c24e2b Notepad a7bd71699cd38d1c Notepad++ 12dc1ea8e34b5a6 Microsoft Paint 7e4dca80246863e3 Control Panel 1cf97c38a5881255 Microsoft Edge f01b4d95cf55d32a Windows Explorer 9d1f905ce5044aee Microsoft Excel a4a5324453625195 Microsoft Word d00655d2aa12ff6d Microsoft PowerPoint bc03160ee1a59fc1 Outlook
Custom Destinations (customDestinations-ms) Created when users pin items to application jump lists. These files contain sequential LNK entries.
Python Analysis Script import struct
import os
from datetime import datetime, timedelta
FILETIME_EPOCH = datetime(1601 , 1 , 1 )
def filetime_to_datetime (filetime_bytes: bytes ) -> datetime:
"""Convert Windows FILETIME (100-ns intervals since 1601) to datetime."""
ft = struct.unpack("<Q" , filetime_bytes)[0 ]
if ft == 0 :
return None
return FILETIME_EPOCH + timedelta(microseconds=ft // 10 )
def parse_lnk_header (lnk_path: str ) -> dict :
"""Parse the Shell Link header from an LNK file."""
with open (lnk_path, "rb" ) as f:
header = f.read(76 )
header_size = struct.unpack("<I" , header[0 :4 ])[0 ]
if header_size != 0x4C :
return {"error" : "Invalid LNK header" }
link_flags = struct.unpack("<I" , header[0x14 :0x18 ])[0 ]
file_attrs = struct.unpack("<I" , header[0x18 :0x1C ])[0 ]
result = {
"header_size" : header_size,
"link_flags" : hex (link_flags),
"file_attributes" : hex (file_attrs),
"creation_time" : filetime_to_datetime(header[0x1C :0x24 ]),
"access_time" : filetime_to_datetime(header[0x24 :0x2C ]),
"write_time" : filetime_to_datetime(header[0x2C :0x34 ]),
"file_size" : struct.unpack("<I" , header[0x34 :0x38 ])[0 ],
"has_target_id_list" : bool (link_flags & 0x01 ),
"has_link_info" : bool (link_flags & 0x02 ),
"has_name" : bool (link_flags & 0x04 ),
"has_relative_path" : bool (link_flags & 0x08 ),
"has_working_dir" : bool (link_flags & 0x10 ),
"has_arguments" : bool (link_flags & 0x20 ),
"has_icon_location" : bool (link_flags & 0x40 ),
}
return result
Investigation Use Cases This section covers investigation use cases for analyzing lnk file and jump list artifacts.
Ensure all prerequisites are met before proceeding
Follow the documented workflow steps in sequence
Record results and any anomalies encountered during this phase
Evidence of File Access
Parse LNK files from Recent folder to identify accessed documents
Cross-reference with MFT timestamps and USN Journal entries
Note that LNK files persist even after target files are deleted
Removable Media Access
LNK files referencing drive letters E:, F:, G: indicate removable media usage
Volume serial number in LNK identifies the specific device
MAC address in TrackerDataBlock identifies the source machine
Network Share Activity
LNK files with UNC paths (\server\share) indicate network file access
NetBIOS name identifies the remote server
Timestamps establish when access occurred
Differences Between Windows 10 and Windows 11 Recent research (IEEE 2025) shows that Windows 11 produces different LNK and Jump List artifacts:
Fewer automatic LNK files generated for certain file types
Modified Jump List behavior for modern applications
UWP/MSIX applications may not generate traditional Jump Lists
Windows 11 Quick Access replaces some Recent functionality
When NOT to Use
You need to perform the attack, not analyze it (use performing-* skills)
Task is about detection, not analysis (use detecting-* skills)
You need to implement controls (use implementing-* skills)
Task is about threat hunting, not post-incident analysis (use hunting-* skills)
You don't have access to the artifacts/logs to analyze
Task requires real-time monitoring (use SOC tools)
Red Flags
Performing actions without explicit written authorization from the asset owner
Testing against production systems without a defined scope and rules of engagement
Failing to use write-blockers when acquiring forensic evidence
Not verifying hash integrity before and after imaging
Modifying original evidence during analysis
Verification
All steps executed successfully against a test environment before production use
Output documented with screenshots or logs demonstrating expected behavior
Hash values computed and verified match between source and image
Chain of custody log complete with timestamps and examiner names
Analysis tools and versions documented for reproducibility
References
Example Output $ LECmd.exe -d "C:\Evidence\Users\jsmith\AppData\Roaming\Microsoft\Windows\Recent" --csv /analysis/lnk_output
LECmd v1.11.0 - LNK File Parser
================================
Processing 47 LNK files...
--- LNK File: Q4_Report.xlsx.lnk ---
Source: C:\Evidence\Users\jsmith\Recent\Q4_Report.xlsx.lnk
Target Path: C:\Users\jsmith\Downloads\Q4_Report.xlsm
Target Created: 2024-01-15 14:33:45 UTC
Target Modified: 2024-01-15 14:33:45 UTC
Target Accessed: 2024-01-15 14:35:12 UTC
File Size: 251,904 bytes
Drive Type: Fixed (C:)
Volume Serial: A4E7-3F21
Machine ID: DESKTOP-J5M1TH
MAC Address: 48:2A:E3:5C:9B:01
--- LNK File: update_client.exe.lnk ---
Source: C:\Evidence\Users\jsmith\Recent\update_client.exe.lnk
Target Path: C:\ProgramData\Updates\update_client.exe
Target Created: 2024-01-15 14:34:02 UTC
Target Modified: 2024-01-15 14:34:02 UTC
Target Accessed: 2024-01-15 14:36:30 UTC
File Size: 1,258,496 bytes
Drive Type: Fixed (C:)
Volume Serial: A4E7-3F21
Machine ID: DESKTOP-J5M1TH
Working Dir: C:\ProgramData\Updates
Arguments: --silent --no-update-check
Run Window: Hidden
======================================================================
$ JLECmd.exe -d "C:\Evidence\Users\jsmith\AppData\Roaming\Microsoft\Windows\Recent\AutomaticDestinations" --csv /analysis/jumplist_output
JLECmd v1.5.0 - Jump List Parser
==================================
Processing 23 AutomaticDestinations files...
--- Application: Microsoft Excel (AppID: 12dc1ea8e34b5a6) ---
Entries: 15
Most Recent:
Entry 0: C:\Users\jsmith\Downloads\Q4_Report.xlsm (2024-01-15 14:35:12 UTC)
Entry 1: \\FILESERV01\Finance\Budget_2024.xlsx (2024-01-14 09:22:30 UTC)
Entry 2: C:\Users\jsmith\Documents\Expenses\Dec2023.xlsx (2024-01-10 16:45:00 UTC)
--- Application: Windows Explorer (AppID: f01b4d95cf55d32a) ---
Entries: 28
Most Recent:
Entry 0: C:\ProgramData\Updates\ (2024-01-15 14:36:25 UTC)
Entry 1: E:\Backup\ (2024-01-15 15:30:00 UTC)
Entry 2: \\FILESERV01\HR\Employees\ (2024-01-15 16:12:45 UTC)
--- Application: cmd.exe (AppID: 9b9cdc69c1c24e2b) ---
Entries: 5
Most Recent:
Entry 0: C:\Windows\System32\cmd.exe (2024-01-15 14:36:00 UTC)
Summary:
Total LNK files processed: 47
Total Jump List entries: 156
Suspicious artifacts: 3 (hidden window execution, USB drive access, network shares)
CSV exported to: /analysis/lnk_output/ and /analysis/jumplist_output/
Process
Analyze the task requirements
Apply domain expertise
Verify output quality
Anti-Rationalization Table Rationalization Reality "We are too small to be targeted" Automated attacks target everyone. Size does not matter. "Security slows us down" A breach slows you down 100x more. Build security in from the start. "We will fix it after launch" Vulnerabilities in production are exploited within hours. Fix before deploy.
