• Home
  • Cyber Crime
  • Cyber warfare
  • APT
  • Data Breach
  • Deep Web
  • Digital ID
  • Hacking
  • Hacktivism
  • Intelligence
  • Internet of Things
  • Laws and regulations
  • Malware
  • Mobile
  • Reports
  • Security
  • Social Networks
  • Terrorism
  • ICS-SCADA
  • POLICIES
  • Contact me
MUST READ

Pro-Ukraine hacktivists claim cyberattack on Russian Airline Aeroflot that caused the cancellation of +100 flights

 | 

Seychelles Commercial Bank Reported Cybersecurity Incident

 | 

Microsoft uncovers macOS flaw allowing bypass TCC protections and exposing sensitive data

 | 

U.S. CISA adds Cisco ISE and PaperCut NG/MF flaws to its Known Exploited Vulnerabilities catalog

 | 

Critical WordPress Post SMTP plugin flaw exposes 200K+ sites to full takeover

 | 

Scattered Spider targets VMware ESXi in using social engineering

 | 

China-linked group Fire Ant exploits VMware and F5 flaws since early 2025

 | 

Allianz Life data breach exposed the data of most of its 1.4M customers

 | 

SECURITY AFFAIRS MALWARE NEWSLETTER ROUND 55

 | 

Security Affairs newsletter Round 534 by Pierluigi Paganini – INTERNATIONAL EDITION

 | 

Law enforcement operations seized BlackSuit ransomware gang’s darknet sites

 | 

Arizona woman sentenced for aiding North Korea in U.S. IT job fraud scheme

 | 

Operation CargoTalon targets Russia’s aerospace with EAGLET malware,

 | 

Unpatched flaw in EoL LG LNV5110R cameras lets hackers gain Admin access

 | 

Koske, a new AI-Generated Linux malware appears in the threat landscape

 | 

Mitel patches critical MiVoice MX-ONE Auth bypass flaw

 | 

Coyote malware is first-ever malware abusing Windows UI Automation

 | 

SonicWall fixed critical flaw in SMA 100 devices exploited in Overstep malware attacks

 | 

DSPM & AI Are Booming: $17.87B and $4.8T Markets by 2033

 | 

Stealth backdoor found in WordPress mu-Plugins folder

 | 
  • Home
  • Cyber Crime
  • Cyber warfare
  • APT
  • Data Breach
  • Deep Web
  • Digital ID
  • Hacking
  • Hacktivism
  • Intelligence
  • Internet of Things
  • Laws and regulations
  • Malware
  • Mobile
  • Reports
  • Security
  • Social Networks
  • Terrorism
  • ICS-SCADA
  • POLICIES
  • Contact me
  • Home
  • Breaking News
  • Cyber Crime
  • Malware
  • Security
  • New advanced FIN7’s Anubis backdoor allows to gain full system control on Windows

New advanced FIN7’s Anubis backdoor allows to gain full system control on Windows

Pierluigi Paganini April 02, 2025

FIN7 cybercrime group has been linked to Anubis, a Python-based backdoor that provides remote access to compromised Windows systems.

The threat actor FIN7, also known as Savage Ladybug, has developed a new Python-based malware, named Anubis Backdoor, which allows attackers to gain full remote control over infected Windows systems. It executes shell commands and system operations while using obfuscation to evade detection. Delivered via phishing and hosted on compromised SharePoint sites, it remains undetected by most antivirus solutions, posing a serious security risk.

“The malware is distributed as a ZIP package, which includes a single Python script alongside multiple Python executables. Some variants execute the obfuscated payload immediately after writing it to disk, while others load the payload and call a specific function from it.” reads the report published by cybersecurity firm PRODAFT. “This variability in execution methods demonstrates the malware’s adaptability and the threat actor’s efforts to diversify their delivery mechanisms for different operational scenarios.”

FIN7 is a Russian criminal group (aka Carbanak) that has been active since mid-2015, it focuses on restaurants, gambling, and hospitality industries in the US to harvest financial information that was used in attacks or sold in cybercrime marketplaces.

The researchers noted that a Python script with ~30 lines serves as the main entry point, decrypting and executing the real payload. The backdoor, targeting Windows, uses AES-CBC encryption with base64 encoding and loads the payload via the exec function. Its obfuscation method, replacing variable names with similar characters, resembles tools like PyObfuscate or Anubis Obfuscator, making analysis harder but not highly complex.

The backdoor communicates via a single TCP socket, switching servers if one fails. Messages, including the groupname, are base64-encoded. Upon execution, it sends the process ID and local IP to the C2 server. To determine the local IP, it creates a UDP socket to 8.8.8.8 on port 80, letting the OS resolve the appropriate address without actual traffic. Each payload contains a groupname and two IPs for communication.

The backdoor supports multiple commands, including retrieving IP, modifying the registry, executing Python code, and loading DLLs into memory. Remote code execution allows the malware to load malicious functionalities dynamically. The malware supports functionalities like keylogging, file transfers, and registry modifications. It continuously processes commands until termination, using subprocess.Popen for shell execution.

Anubis backdoor

“AnubisBackdoor is a stealthy Python-based tool used by Savage Ladybug (FIN7) to maintain access to compromised systems. Despite its mild obfuscation, it remains fully undetected (FUD) by most antivirus solutions. Delivered via malspam campaigns, with compromised SharePoint instances serving the payload, it poses a significant threat to enterprise environments.” concludes the report. “Variants of the backdoor execute the payload differently, suggesting ongoing refinement by attackers.”

Follow me on Twitter: @securityaffairs and Facebook and Mastodon

Pierluigi Paganini

(SecurityAffairs – hacking, Anubis backdoor)


facebook linkedin twitter

Anubis backdoor FIN7 Hacking hacking news information security news IT Information Security Pierluigi Paganini Security Affairs Security News

you might also like

Pierluigi Paganini July 29, 2025
Pro-Ukraine hacktivists claim cyberattack on Russian Airline Aeroflot that caused the cancellation of +100 flights
Read more
Pierluigi Paganini July 29, 2025
Seychelles Commercial Bank Reported Cybersecurity Incident
Read more

leave a comment

newsletter

Subscribe to my email list and stay
up-to-date!

    recent articles

    Pro-Ukraine hacktivists claim cyberattack on Russian Airline Aeroflot that caused the cancellation of +100 flights

    Hacktivism / July 29, 2025

    Seychelles Commercial Bank Reported Cybersecurity Incident

    Data Breach / July 29, 2025

    Microsoft uncovers macOS flaw allowing bypass TCC protections and exposing sensitive data

    Hacking / July 29, 2025

    U.S. CISA adds Cisco ISE and PaperCut NG/MF flaws to its Known Exploited Vulnerabilities catalog

    Security / July 28, 2025

    Critical WordPress Post SMTP plugin flaw exposes 200K+ sites to full takeover

    Security / July 28, 2025

    To contact me write an email to:

    Pierluigi Paganini :
    pierluigi.paganini@securityaffairs.co

    LEARN MORE

    QUICK LINKS

    • Home
    • Cyber Crime
    • Cyber warfare
    • APT
    • Data Breach
    • Deep Web
    • Digital ID
    • Hacking
    • Hacktivism
    • Intelligence
    • Internet of Things
    • Laws and regulations
    • Malware
    • Mobile
    • Reports
    • Security
    • Social Networks
    • Terrorism
    • ICS-SCADA
    • POLICIES
    • Contact me

    Copyright@securityaffairs 2024

    We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept All”, you consent to the use of ALL the cookies. However, you may visit "Cookie Settings" to provide a controlled consent.
    Cookie SettingsAccept All
    Manage consent

    Privacy Overview

    This website uses cookies to improve your experience while you navigate through the website. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities...
    Necessary
    Always Enabled
    Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
    Non-necessary
    Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.
    SAVE & ACCEPT