Mastodawn

ANY.RUN May 15, 2025

🚨 New #phishing campaign uses #DBatLoader to drop #Remcos RAT.
The infection relies on #UAC bypass with mock directories, obfuscated .cmd scripts, Windows #LOLBAS techniques, and advanced persistence techniques. At the time of analysis, the samples had not yet been submitted to #VirusTotal ⚠️

🔗 Execution chain:
#Phish ➡️ Archive ➡️ DBatLoader ➡️ CMD ➡️ SndVol.exe (Remcos injected)

👨‍💻 #ANYRUN allows analysts to quickly uncover stealth techniques like LOLBAS abuse, injection, and UAC bypass, all within a single interactive analysis session. See analysis: https://app.any.run/tasks/c57ca499-51f5-4c50-a91f-70bc5a60b98d/?utm_source=mastodon&utm_medium=post&utm_campaign=dbatloader&utm_term=150525&utm_content=linktoservice

🛠️ Key techniques:
🔹 #Obfuscated with #BatCloak .cmd files are used to download and run #payload.
🔹 Remcos injects into trusted system processes (SndVol.exe, colorcpl.exe).
🔹 Scheduled tasks trigger a Cmwdnsyn.url file, which launches a .pif dropper to maintain persistence.
🔹 Esentutl.exe is abused via LOLBAS to copy cmd.exe into the alpha.pif file.
🔹 UAC bypass is achieved with fake directories like “C:\Windows “ (note the trailing space), exploiting how Windows handles folder names.

⚠️ This threat uses multiple layers of stealth and abuse of built-in Windows tools. Behavioral detection and attention to unusual file paths or another activity are crucial to catching it early. #ANYRUN Sandbox provides the visibility needed to spot these techniques in real time 🚀

Analysis FAKTURA.tar.lz (MD5: B7AAF85E1B3EC2C1AF0098AE92D3E46E) Malicious activity - Interactive analysis ANY.RUN

Interactive malware hunting service. Live testing of most type of threats in any environments. No installation and no waiting necessary.

Bob Carver Jun 13, 2023

A fully undetectable (FUD) malware obfuscation engine named BatCloak is being used to deploy various malware strains since September 2022, while persistently evading antivirus detection.
About 79.6% of the total 784 artifacts unearthed have no-detection across all security solutions, the cybersecurity firm added, highlighting BatCloak's ability to circumvent traditional detection mechanisms. https://thehackernews.com/2023/06/cybercriminals-using-powerful-batcloak.html #CyberSecurity #BatCloak #malware #obfuscation #undetectable

Cybercriminals Using Powerful BatCloak Engine to Make Malware Fully Undetectable

BatCloak, the undetectable malware obfuscation engine deployed since Sep '22, allowing threat actors to easily load multiple malware families.

The Hacker News

securityaffairs Jun 12, 2023

#FUD #Malware obfuscation engine #BatCloak continues to evolve
https://securityaffairs.com/147371/cyber-crime/fud-malware-obfuscation-engine-batcloak.html
#securityaffairs #hacking #malware

FUD Malware obfuscation engine BatCloak continues to evolve

Researchers detailed a fully undetectable (FUD) malware obfuscation engine named BatCloak that is used by threat actors. Researchers from Trend Micro have analyzed the BatCloak, a fully undetectable (FUD) malware obfuscation engine used by threat actors to stealthily deliver their malware since September 2022. The samples analyzed by the experts demonstrated a remarkable ability to persistently evade […]

Security Affairs