Sowing Discord: Reaping the benefits of collaboration app abuse
As telework has become the norm throughout the COVID-19 pandemic, attackers are modifying their tactics to take advantage of the changes to employee workflows. * Attackers are leveraging collaboration platforms, such as Discord and Slack, to stay under the radar and evade organ
Hafnium Update: Continued Microsoft Exchange Server Exploitation
Update 3/11: The following OSQuery detects active commands being run through webshells observed used by actors on compromised Exchange servers. While systems may have been patched to defend against Hafnium and others, threat actors may have leveraged these vulnerabilities to esta
Masslogger campaigns exfiltrates user credentials
By Vanja Svajcer. News summary * As protection techniques develop, attackers are finding it harder to successfully attack their targets and must find creative ways to succeed. * Cisco Talos recently discovered a campaign utilizing a variant of the Masslogger trojan designe
Threat Advisory: SolarWinds supply chain attack
Update 12/21: IOC section updated to include new information and associated stage. Update 12/18: We have been able to verify the name server for the DGA domain was updated as far back as late February. Compromised binaries appear to have been available on the SolarWinds website
FireEye Breach Detection Guidance
Update 12/14: Cisco Talos has implemented additional blocks in relation to the supply chain attack on SolarWinds® Orion® Platform. The U.S. Cybersecurity and Infrastructure Security Agency has issued Emergency Directive 21-01 due to this campaign. Talos is continuing to investiga
Cisco Talos Advisory on Adversaries Targeting the Healthcare and Public Health Sector
Background Cisco Talos has become aware that an adversary is leveraging Trickbot banking trojan and Ryuk ransomware to target U.S. hospitals and healthcare providers at an increasing rate. Security journalists reported on October 28, 2020 that the adversary was preparing to encr
What to expect when you're electing: The building blocks of disinformation campaigns
By Nick Biasini, Kendall McKay and Matt Valites. Editor's note: Related reading on Talos election security research: * /what-to-expect-when-youre-electing * /election-roundtable-video * /what-to-expect-electing-disinformation-building-blocks As Cisco Talos discovered du
Adversarial use of current events as lures
The goal of malicious activity is to compromise the system to install some unauthorized software. Increasingly that goal is tied to one thing: the user. Over the past several years, we as an industry improved exploit mitigation and the value of working exploits has increased acco
Vulnerability Spotlight: Zoom Communications user enumeration
Video conferencing and calling software has spiked in popularity as individuals across the globe are forced to stay home due to the COVID-19 pandemic. There are a plethora of players in this space, with one or two getting increased attention. One service in particular — Zoom — ha