User Execution: Malicious File
An adversary may rely upon a user opening a malicious file in order to gain execution. Users may be subjected to social engineering to get them to open a file that will lead to code execution. This user action will typically be observed as follow-on behavior from Spearphishing Attachment. Adversaries may use several types of files that require a user to execute them, including .doc, .pdf, .xls, .rtf, .scr, .exe, .lnk, .pif, and .cpl.
Adversaries may employ various forms of Masquerading on the file to increase the likelihood that a user will open it.
While Malicious File frequently occurs shortly after Initial Access it may occur at other phases of an intrusion, such as when an adversary places a file in a shared directory or on a user's desktop hoping that a user will click on it. This activity may also be seen shortly after Internal Spearphishing.
APT29 has used various forms of spearphishing attempting to get a user to open links or attachments, including, but not limited to, malicious Microsoft Word documents, .pdf, and .lnk files.  
menuPass has attempted to get victims to open malicious files such as Windows Shortcuts (.lnk) and/or Microsoft Office documents, sent via email as part of spearphishing campaigns.
PROMETHIUM has attempted to get users to execute compromised installation files for legitimate software including compression applications, security software, browsers, file recovery applications, and other tools and utilities.
StrongPity has been executed via compromised installation files for legitimate software including compression applications, security software, browsers, file recovery applications, and other tools and utilities.
TA505 has used lures to get users to enable content in malicious attachments and execute malicious files contained in archives. For example, TA505 makes their malware look like legitimate Microsoft Word documents, .pdf and/or .lnk files. 
|The White Company|
Application control may be able to prevent the running of executables masquerading as other files.
Use user training as a way to bring awareness to common phishing and spearphishing techniques and how to raise suspicion for potentially malicious events.
Monitor the execution of and command-line arguments for applications that may be used by an adversary to gain initial access that require user interaction. This includes compression applications, such as those for zip files, that can be used to Deobfuscate/Decode Files or Information in payloads.
Anti-virus can potentially detect malicious documents and files that are downloaded and executed on the user's computer. Endpoint sensing or network sensing can potentially detect malicious events once the file is opened (such as a Microsoft Word document or PDF reaching out to the internet or spawning powershell.exe).
- FireEye Threat Intelligence. (2015, December 1). China-based Cyber Threat Group Uses Dropbox for Malware Communications and Targets Hong Kong Media Outlets. Retrieved December 4, 2015.
- Arsene, L. (2020, April 21). Oil & Gas Spearphishing Campaigns Drop Agent Tesla Spyware in Advance of Historic OPEC+ Deal. Retrieved May 19, 2020.
- QiAnXin Threat Intelligence Center. (2019, February 18). APT-C-36: Continuous Attacks Targeting Colombian Government Institutions and Corporations. Retrieved May 5, 2020.
- Moran, N., Oppenheim, M., Engle, S., & Wartell, R.. (2014, September 3). Darwin’s Favorite APT Group [Blog]. Retrieved November 12, 2014.
- Sancho, D., et al. (2012, May 22). IXESHE An APT Campaign. Retrieved June 7, 2019.
- Ahl, I. (2017, June 06). Privileges and Credentials: Phished at the Request of Counsel. Retrieved May 17, 2018.
- Lee, B, et al. (2018, February 28). Sofacy Attacks Multiple Government Entities. Retrieved March 15, 2018.
- Accenture Security. (2018, November 29). SNAKEMACKEREL. Retrieved April 15, 2019.
- F-Secure Labs. (2015, September 17). The Dukes: 7 years of Russian cyberespionage. Retrieved December 10, 2015.
- Dunwoody, M., et al. (2018, November 19). Not So Cozy: An Uncomfortable Examination of a Suspected APT29 Phishing Campaign. Retrieved November 27, 2018.
- Faou, M., Tartare, M., Dupuy, T. (2019, October). OPERATION GHOST. Retrieved September 23, 2020.
- FireEye Labs. (2015, April). APT30 AND THE MECHANICS OF A LONG-RUNNING CYBER ESPIONAGE OPERATION. Retrieved May 1, 2015.
- Foltýn, T. (2018, March 13). OceanLotus ships new backdoor using old tricks. Retrieved May 22, 2018.
- Dahan, A. (2017, May 24). OPERATION COBALT KITTY: A LARGE-SCALE APT IN ASIA CARRIED OUT BY THE OCEANLOTUS GROUP. Retrieved November 5, 2018.
- Dumont, R. (2019, March 20). Fake or Fake: Keeping up with OceanLotus decoys. Retrieved April 1, 2019.
- Henderson, S., et al. (2020, April 22). Vietnamese Threat Actors APT32 Targeting Wuhan Government and Chinese Ministry of Emergency Management in Latest Example of COVID-19 Related Espionage. Retrieved April 28, 2020.
- Microsoft Threat Protection Intelligence Team. (2020, June 18). Inside Microsoft Threat Protection: Mapping attack chains from cloud to endpoint. Retrieved June 22, 2020.
- FireEye. (2018, February 20). APT37 (Reaper): The Overlooked North Korean Actor. Retrieved March 1, 2018.
- Hawley et al. (2019, January 29). APT39: An Iranian Cyber Espionage Group Focused on Personal Information. Retrieved February 19, 2019.
- Rusu, B. (2020, May 21). Iranian Chafer APT Targeted Air Transportation and Government in Kuwait and Saudi Arabia. Retrieved May 22, 2020.
- Symantec. (2018, February 28). Chafer: Latest Attacks Reveal Heightened Ambitions. Retrieved May 22, 2020.
- Bermejo, L., et al. (2017, June 22). Following the Trail of BlackTech’s Cyber Espionage Campaigns. Retrieved May 5, 2020.
- DiMaggio, J. (2016, April 28). Tick cyberespionage group zeros in on Japan. Retrieved July 16, 2018.
- Chen, J. et al. (2019, November). Operation ENDTRADE: TICK’s Multi-Stage Backdoors for Attacking Industries and Stealing Classified Data. Retrieved June 9, 2020.
- Sushko, O. (2019, April 17). macOS Bundlore: Mac Virus Bypassing macOS Security Features. Retrieved June 30, 2020.
- Grunzweig, J.. (2017, April 20). Cardinal RAT Active for Over Two Years. Retrieved December 8, 2018.
- McCabe, A. (2020, January 23). The Fractured Statue Campaign: U.S. Government Agency Targeted in Spear-Phishing Attacks. Retrieved June 2, 2020.
- Svajcer, V. (2018, July 31). Multiple Cobalt Personality Disorder. Retrieved September 5, 2018.
- Unit 42. (2018, October 25). New Techniques to Uncover and Attribute Financial actors Commodity Builders and Infrastructure Revealed. Retrieved December 11, 2018.
- Blaich, A., et al. (2018, January 18). Dark Caracal: Cyber-espionage at a Global Scale. Retrieved April 11, 2018.
- Kaspersky Lab's Global Research & Analysis Team. (2015, August 10). Darkhotel's attacks in 2015. Retrieved November 2, 2018.
- Falcone, R., et al. (2018, July 27). New Threat Actor Group DarkHydrus Targets Middle East Government. Retrieved August 2, 2018.
- Unit 42. (2017, December 15). Unit 42 Playbook Viewer. Retrieved December 20, 2017.
- US-CERT. (2018, March 16). Alert (TA18-074A): Russian Government Cyber Activity Targeting Energy and Other Critical Infrastructure Sectors. Retrieved June 6, 2018.
- US-CERT. (2017, October 20). Alert (TA17-293A): Advanced Persistent Threat Activity Targeting Energy and Other Critical Infrastructure Sectors. Retrieved November 2, 2017.
- O'Gorman, G., and McDonald, G.. (2012, September 6). The Elderwood Project. Retrieved February 15, 2018.
- Clayton, M.. (2012, September 14). Stealing US business secrets: Experts ID two huge cyber 'gangs' in China. Retrieved February 15, 2018.
- Salvio, J.. (2014, June 27). New Banking Malware Uses Network Sniffing for Data Theft. Retrieved March 25, 2019.
- Lee, S.. (2019, April 24). Emotet Using WMI to Launch PowerShell Encoded Code. Retrieved May 24, 2019.
- Kessem, L., et al. (2017, November 13). New Banking Trojan IcedID Discovered by IBM X-Force Research. Retrieved July 14, 2020.
- Vengerik, B. et al.. (2014, December 5). Hacking the Street? FIN4 Likely Playing the Market. Retrieved December 17, 2018.
- Vengerik, B. & Dennesen, K.. (2014, December 5). Hacking the Street? FIN4 Likely Playing the Market. Retrieved January 15, 2019.
- Visa Public. (2019, February). FIN6 Cybercrime Group Expands Threat to eCommerce Merchants. Retrieved September 16, 2019.
- Carr, N., et al. (2017, April 24). FIN7 Evolution and the Phishing LNK. Retrieved April 24, 2017.
- Bohannon, D. & Carr N. (2017, June 30). Obfuscation in the Wild: Targeted Attackers Lead the Way in Evasion Techniques. Retrieved February 12, 2018.
- Kizhakkinan, D. et al.. (2016, May 11). Threat Actor Leverages Windows Zero-day Exploit in Payment Card Data Attacks. Retrieved February 12, 2018.
- Elovitz, S. & Ahl, I. (2016, August 18). Know Your Enemy: New Financially-Motivated & Spear-Phishing Group. Retrieved February 26, 2018.
- Adamitis, D. et al. (2019, June 4). It's alive: Threat actors cobble together open-source pieces into monstrous Frankenstein campaign. Retrieved May 11, 2020.
- Symantec Security Response. (2018, October 10). Gallmaker: New Attack Group Eschews Malware to Live off the Land. Retrieved November 27, 2018.
- Kakara, H., Maruyama, E. (2020, April 17). Gamaredon APT Group Use Covid-19 Lure in Campaigns. Retrieved May 19, 2020.
- Boutin, J. (2020, June 11). Gamaredon group grows its game. Retrieved June 16, 2020.
- Falcone, R., et al. (2018, August 02). The Gorgon Group: Slithering Between Nation State and Cybercrime. Retrieved August 7, 2018.
- Anubhav, A., Jallepalli, D. (2016, September 23). Hancitor (AKA Chanitor) observed using multiple attack approaches. Retrieved August 13, 2020.
- Kimayong, P. (2020, June 18). COVID-19 and FMLA Campaigns used to install new IcedID banking malware. Retrieved July 14, 2020.
- GReAT. (2014, December 10). Cloud Atlas: RedOctober APT is back in style. Retrieved May 8, 2020.
- GReAT. (2019, August 12). Recent Cloud Atlas activity. Retrieved May 8, 2020.
- Symantec. (2018, March 14). Inception Framework: Alive and Well, and Hiding Behind Proxies. Retrieved May 8, 2020.
- Lancaster, T. (2018, November 5). Inception Attackers Target Europe with Year-old Office Vulnerability. Retrieved May 8, 2020.
- Hromcova, Z. and Cherpanov, A. (2020, June). INVISIMOLE: THE HIDDEN PART OF THE STORY. Retrieved July 16, 2020.
- Lee, S.. (2019, May 14). JCry Ransomware. Retrieved June 18, 2019.
- Sherstobitoff, R. (2018, March 08). Hidden Cobra Targets Turkish Financial Sector With New Bankshot Implant. Retrieved May 18, 2018.
- F-Secure Labs. (2020, August 18). Lazarus Group Campaign Targeting the Cryptocurrency Vertical. Retrieved September 1, 2020.
- Axel F, Pierre T. (2017, October 16). Leviathan: Espionage actor spearphishes maritime and defense targets. Retrieved February 15, 2018.
- Co, M. and Sison, G. (2018, February 8). Attack Using Windows Installer msiexec.exe leads to LokiBot. Retrieved April 18, 2019.
- The Cylance Threat Research Team. (2017, March 22). El Machete's Malware Attacks Cut Through LATAM. Retrieved September 13, 2019.
- Kaspersky Global Research and Analysis Team. (2014, August 20). El Machete. Retrieved September 13, 2019.
- ESET. (2019, July). MACHETE JUST GOT SHARPER Venezuelan government institutions under attack. Retrieved September 13, 2019.
- Villeneuve, N. et al.. (2013). OPERATION SAFFRON ROSE . Retrieved May 28, 2020.
- PwC and BAE Systems. (2017, April). Operation Cloud Hopper: Technical Annex. Retrieved April 13, 2017.
- FireEye iSIGHT Intelligence. (2017, April 6). APT10 (MenuPass Group): New Tools, Global Campaign Latest Manifestation of Longstanding Threat. Retrieved June 29, 2017.
- Accenture Security. (2018, April 23). Hogfish Redleaves Campaign. Retrieved July 2, 2018.
- United States District Court Southern District of New York (USDC SDNY) . (2018, December 17). United States of America v. Zhu Hua and Zhang Shilong. Retrieved April 17, 2019.
- Matsuda, A., Muhammad I. (2018, September 13). APT10 Targeting Japanese Corporations Using Updated TTPs. Retrieved September 17, 2018.
- Sierra, E., Iglesias, G.. (2018, April 24). Metamorfo Campaigns Targeting Brazilian Users. Retrieved July 30, 2020.
- Yonathan Klijnsma. (2016, May 17). Mofang: A politically motivated information stealing adversary. Retrieved May 12, 2020.
- GReAT. (2019, April 10). Gaza Cybergang Group1, operation SneakyPastes. Retrieved May 13, 2020.
- Lancaster, T.. (2017, November 14). Muddying the Water: Targeted Attacks in the Middle East. Retrieved March 15, 2018.
- Singh, S. et al.. (2018, March 13). Iranian Threat Group Updates Tactics, Techniques and Procedures in Spear Phishing Campaign. Retrieved April 11, 2018.
- Kaspersky Lab's Global Research & Analysis Team. (2018, October 10). MuddyWater expands operations. Retrieved November 2, 2018.
- Adamitis, D. et al. (2019, May 20). Recent MuddyWater-associated BlackWater campaign shows signs of new anti-detection techniques. Retrieved June 5, 2019.
- ClearSky. (2019, June). Iranian APT group ‘MuddyWater’ Adds Exploits to Their Arsenal. Retrieved May 14, 2020.
- Reaqta. (2017, November 22). A dive into MuddyWater APT targeting Middle-East. Retrieved May 18, 2020.
- CheckPoint. (2020, May 7). Naikon APT: Cyber Espionage Reloaded. Retrieved May 26, 2020.
- Lee, B., Falcone, R. (2018, February 23). OopsIE! OilRig Uses ThreeDollars to Deliver New Trojan. Retrieved July 16, 2018.
- Lee, B., Falcone, R. (2018, July 25). OilRig Targets Technology Service Provider and Government Agency with QUADAGENT. Retrieved August 9, 2018.
- Meyers, A. (2018, November 27). Meet CrowdStrike’s Adversary of the Month for November: HELIX KITTEN. Retrieved December 18, 2018.
- Carbon Black Threat Analysis Unit. (2019, February 12). New macOS Malware Variant of Shlayer (OSX) Discovered. Retrieved August 8, 2019.
- Long, Joshua. (2018, February 21). OSX/Shlayer: New Mac malware comes out of its shell. Retrieved August 28, 2019.
- Lunghi, D., et al. (2017, December). Untangling the Patchwork Cyberespionage Group. Retrieved July 10, 2018.
- Meltzer, M, et al. (2018, June 07). Patchwork APT Group Targets US Think Tanks. Retrieved July 16, 2018.
- Windows Defender Advanced Threat Hunting Team. (2016, April 29). PLATINUM: Targeted attacks in South and Southeast Asia. Retrieved February 15, 2018.
- Mercer, W, et al. (2020, April 16). PoetRAT: Python RAT uses COVID-19 lures to target Azerbaijan public and private sectors. Retrieved April 27, 2020.
- hasherezade. (2016, April 11). No money, but Pony! From a mail to a trojan horse. Retrieved May 21, 2020.
- Mercer, W. et al. (2020, June 29). PROMETHIUM extends global reach with StrongPity3 APT. Retrieved July 20, 2020.
- Tudorica, R. et al. (2020, June 30). StrongPity APT - Revealing Trojanized Tools, Working Hours and Infrastructure. Retrieved July 20, 2020.
- Ash, B., et al. (2018, June 26). RANCOR: Targeted Attacks in South East Asia Using PLAINTEE and DDKONG Malware Families. Retrieved July 2, 2018.
- Han, Karsten. (2019, June 4). Strange Bits: Sodinokibi Spam, CinaRAT, and Fake G DATA. Retrieved August 4, 2020.
- Saavedra-Morales, J, et al. (2019, October 20). McAfee ATR Analyzes Sodinokibi aka REvil Ransomware-as-a-Service – Crescendo. Retrieved August 5, 2020.
- Ozarslan, S. (2020, January 15). A Brief History of Sodinokibi. Retrieved August 5, 2020.
- Knight, S.. (2020, April 16). VMware Carbon Black TAU Threat Analysis: The Evolution of Lazarus. Retrieved May 1, 2020.
- Duncan, B., Harbison, M. (2019, January 23). Russian Language Malspam Pushing Redaman Banking Malware. Retrieved June 16, 2020.
- Skulkin, O. (2019, August 5). Following the RTM Forensic examination of a computer infected with a banking trojan. Retrieved May 11, 2020.
- Cherepanov, A.. (2016, December 13). The rise of TeleBots: Analyzing disruptive KillDisk attacks. Retrieved June 10, 2020.
- Sherstobitoff, R., Malhotra, A., et. al.. (2018, December 18). Operation Sharpshooter Campaign Targets Global Defense, Critical Infrastructure. Retrieved May 14, 2020.
- Skulkin, O.. (2019, January 20). Silence: Dissecting Malicious CHM Files and Performing Forensic Analysis. Retrieved May 24, 2019.
- GReAT. (2017, November 1). Silence – a new Trojan attacking financial organizations. Retrieved May 24, 2019.
- Group-IB. (2018, September). Silence: Moving Into the Darkside. Retrieved May 5, 2020.
- Platt, J. and Reeves, J.. (2019, March). FIN7 Revisited: Inside Astra Panel and SQLRat Malware. Retrieved June 18, 2019.
- Grunzweig, J. and Wilhoit, K. (2018, November 29). The Fractured Block Campaign: CARROTBAT Used to Deliver Malware Targeting Southeast Asia. Retrieved June 2, 2020.
- Axel F. (2017, April 27). APT Targets Financial Analysts with CVE-2017-0199. Retrieved February 15, 2018.
- Proofpoint Staff. (2017, September 27). Threat Actor Profile: TA505, From Dridex to GlobeImposter. Retrieved May 28, 2019.
- Proofpoint Staff. (2018, June 8). TA505 shifts with the times. Retrieved May 28, 2019.
- Schwarz, D. and Proofpoint Staff. (2019, January 9). ServHelper and FlawedGrace - New malware introduced by TA505. Retrieved May 28, 2019.
- Salem, E. (2019, April 25). Threat Actor TA505 Targets Financial Enterprises Using LOLBins and a New Backdoor Malware. Retrieved May 28, 2019.
- Proofpoint Staff. (2018, July 19). TA505 Abusing SettingContent-ms within PDF files to Distribute FlawedAmmyy RAT. Retrieved April 19, 2019.
- Proofpoint Staff. (2018, March 7). Leaked Ammyy Admin Source Code Turned into Malware. Retrieved May 28, 2019.
- Hiroaki, H. and Lu, L. (2019, June 12). Shifting Tactics: Breaking Down TA505 Group’s Use of HTML, RATs and Other Techniques in Latest Campaigns. Retrieved May 29, 2020.
- Schwarz, D. et al. (2019, October 16). TA505 Distributes New SDBbot Remote Access Trojan with Get2 Downloader. Retrieved May 29, 2020.
- Frydrych, M. (2020, April 14). TA505 Continues to Infect Networks With SDBbot RAT. Retrieved May 29, 2020.
- Livelli, K, et al. (2018, November 12). Operation Shaheen. Retrieved May 1, 2019.
- Llimos, N., Pascual, C.. (2019, February 12). Trickbot Adds Remote Application Credential-Grabbing Capabilities to Its Repertoire. Retrieved March 12, 2019.
- Dahan, A. et al. (2019, December 11). DROPPING ANCHOR: FROM A TRICKBOT INFECTION TO THE DISCOVERY OF THE ANCHOR MALWARE. Retrieved September 10, 2020.
- Moore, S. et al. (2020, April 30). Anomali Suspects that China-Backed APT Pirate Panda May Be Seeking Access to Vietnam Government Data Center. Retrieved May 19, 2020.
- US-CERT. (2018, June 14). MAR-10135536-12 – North Korean Trojan: TYPEFRAME. Retrieved July 13, 2018.
- Salem, E. et al. (2020, May 28). VALAK: MORE THAN MEETS THE EYE . Retrieved June 19, 2020.
- Duncan, B. (2020, July 24). Evolution of Valak, from Its Beginnings to Mass Distribution. Retrieved August 31, 2020.
- Reaves, J. and Platt, J. (2020, June). Valak Malware and the Connection to Gozi Loader ConfCrew. Retrieved August 31, 2020.
- Symantec. (2019, March 6). Whitefly: Espionage Group has Singapore in Its Sights. Retrieved May 26, 2020.
- Karim, T. (2018, August). TRAILS OF WINDSHIFT. Retrieved June 25, 2020.
- John, E. and Carvey, H. (2019, May 30). Unraveling the Spiderweb: Timelining ATT&CK Artifacts Used by GRIM SPIDER. Retrieved May 12, 2020.