Ryuk Ransomware Gang Uses Zerologon Bug for Lightning-Fast Attack

The Ryuk threat actors have struck again, moving from sending a phishing email to complete encryption across the victim’s network in just five hours. That breakneck speed is partially the result of the gang using the Zerologon privilege-escalation bug CVE-2020-1472, less than two hours after the...

Trickbot disrupted

As announced today, Microsoft took action against the Trickbot botnet, disrupting one of the world’s most persistent malware operations. Microsoft worked with telecommunications providers around the world to disrupt key Trickbot infrastructure. As a result, operators will no longer be able to use...

Threat Source newsletter for Sept. 24, 2020

Newsletter compiled by Jon Munshaw. Good afternoon, Talos readers. After months years? in beta, an official release candidate is out now for Snort 3. Stay tuned for an officially official release in about a month. In other Snort rules, we also have a deep dive into our detection and prevention of...

Fileless Malware Tops Critical Endpoint Threats for 1H 2020

In the first half of 2020, the most common critical-severity cybersecurity threat to endpoints was fileless malware, according to a recent analysis of telemetry data from Cisco. Fileless threats consist of malicious code that runs in memory after initial infection, instead of files being stored o...

New Snort, ClamAV coverage strikes back against Cobalt Strike

By Nick Mavis. Editing by Joe Marshall and Jon Munshaw. Cisco Talos is releasing a new research paper called “The Art and Science of Detecting Cobalt Strike.” We recently released a more granular set of updated SNORTⓇ and ClamAVⓇ detection signatures to detect attempted obfuscation and exfiltrati...

Exploit for Improper Restriction of Operations within the Bounds of a Memory Buffer in Microsoft

This is a PoC exploit for CVE-2020-0796, a buffer overflow vulne...

CISA: Chinese Hackers Exploiting Unpatched Devices to Target U.S. Agencies

The US Cybersecurity and Infrastructure Security Agency CISA issued a new advisory on Monday about a wave of cyberattacks carried by Chinese nation-state actors targeting US government agencies and private entities. "CISA has observed Chinese Ministry of State Security-affiliated cyber threat...

Feds Warn Nation-State Hackers are Actively Exploiting Unpatched Microsoft Exchange, F5, VPN Bugs

The U.S. government is warning that Chinese threat actors have successfully compromised several government and private sector entities in recent months, by exploiting vulnerabilities in F5 BIG-IP devices, Citrix and Pulse Secure VPNs and Microsoft Exchange servers. Patches are currently available...

SharpHose - Asynchronous Password Spraying Tool In C# For Windows Environments

SharpHose is a C password spraying tool designed to be fast, safe, and usable over Cobalt Strike's execute-assembly. It provides a flexible way to interact with Active Directory using domain-joined and non-joined contexts, while also being able to target specific domains and domain controllers...

Raining SYSTEM Shells with Citrix Workspace app

TL;DR Citrix Workspace is vulnerable to a remote command execution attack running under the context of the SYSTEM account. By sending a crafted message over a named pipe and spoofing the client process ID, the Citrix Workspace Updater Service can be tricked into executing an arbitrary process und...

Chinese Hackers Escalate Attacks Against India and Hong Kong Amid Tensions

An emerging threat actor out of China has been traced to a new hacking campaign aimed at government agencies in India and residents of Hong Kong intending to steal sensitive information, cybersecurity firm Malwarebytes revealed in the latest report shared with The Hacker News. The attacks were...

Chinese APT group targets India and Hong Kong using new variant of MgBot malware

This blog post was authored by Hossein Jazi and Jérôme Segura On July 2, we found an archive file with an embedded document pretending to be from the government of India. This file used template injection to drop a malicious template which loaded a variant of Cobalt Strike. One day later, the sam...

Sodinokibi Ransomware Now Scans Networks For PoS Systems

Cybercriminals behind recent Sodinokibi ransomware attacks are now upping their ante and scanning their victims’ networks for credit card or point of sale PoS software. Researchers believe this is a new tactic designed to allow attackers to get the biggest bang for their buck – ransom payments an...

IndigoDrop spreads via military-themed lures to deliver Cobalt Strike

By Asheer Malhotra. Cisco Talos has observed a malware campaign that utilizes military-themed malicious Microsoft Office documents maldocs to spread Cobalt Strike beacons containing full-fledged RAT capabilities. These maldocs use malicious macros to deliver a multistage and highly modular...

Multi-stage APT attack drops Cobalt Strike using Malleable C2 feature

This blog post was authored by Hossein Jazi and Jérôme Segura On June 10, we found a malicious Word document disguised as a resume that uses template injection to drop a .Net Loader. This is the first part of a multi-stage attack that we believe is associated to an APT attack. In the last stage,...

10-Strike Bandwidth Monitor 3.9 Unquoted Service Path Vulnerability

10-Strike Bandwidth Monitor version 3.9 services Svc10StrikeBandMontitor, Svc10StrikeBMWD, and Svc10StrikeBMAgent suffer from unquoted service path vulnerabilities. Exploit Title: Bandwidth Monitor 3.9 - Unquoted Services Paths Exploit Author: Bobby Cooke Vendor Site: https://www.10-strike.com/...

PayloadsAllTheThings - A List Of Useful Payloads And Bypass For Web Application Security And Pentest/CTF

A list of useful payloads and bypasses for Web Application Security. Feel free to improve with your payloads and techniques ! Every section contains the following files, you can use the templatevuln folder to create a new chapter: README.md - vulnerability description and how to exploit it Intrud...

Valve Confirms CS:GO, Team Fortress 2 Source-Code Leak

The discovery of leaked source code for two popular games – Counter-Strike: Global Offensive CS:GO and Team Fortress 2 – has led to security concerns and even calls for gamers to uninstall the software from their computers. The developer and publisher of the two games, Valve, is downplaying the...

SweetPotato – Service to SYSTEM

I've had a keen interest in the original RottenPotato and JuicyPotato exploits that utilize DCOM and NTLM reflection to perform privilege escalation to SYSTEM from service accounts. The applications behave by leveraging the SeImpersontePrivilege and MITM to perform privilege escalation when a hig...

Ps-Tools - An Advanced Process Monitoring Toolkit For Offensive Operations

Having a good technical understanding of the systems we land on during an engagement is a key condition for deciding what is going to be the next step within an operation. Collecting and analysing data of running processes from compromised systems gives us a wealth of information and helps us to...