CoralRaider targets victims’ data and social media accounts

Cisco Talos discovered a new threat actor were calling "CoralRaider" that we believe is of Vietnamese origin and financially motivated. CoralRaider has been operating since at least 2023, targeting victims in several Asian and Southeast Asian countries. This group focuses on stealing victims...

Adversaries are leveraging remote access tools now more than ever — here’s how to stop them

Remote system management/desktop access tools such as AnyDesk and TeamViewer have grown in popularity since 2020. While there are many legitimate uses for this software, adversaries are also finding ways to use them for command and control in their campaigns. There is no easy way to effectively...

Enter the substitute teacher

Welcome to this weeks threat source newsletter with Jon out, youve got me as your substitute teacher. Im taking you back to those halcyon days of youth and that moment when you found out that you had a sub that day, will I be the teacher that just rolls in the TV cart and delivers the single...

“Pig butchering” is an evolution of a social engineering tactic we’ve seen for years

Whether you want to call them "catfishing," "pig butchering" or just good old-fashioned "social engineering," romance scams have been around forever. I was first introduced to them through the MTV show "Catfish," but recently they seem to be making headlines as the term "pig butchering" enters th...

New details on TinyTurla’s post-compromise activity reveal full kill chain

Cisco Talos is providing an update on its two recent reports on a new and ongoing campaign where Turla, a Russian espionage group, deployed their TinyTurla-NG TTNG implant. We now have new information on the entire kill chain this actor uses, including the tactics, techniques and procedures TTPs...

Netgear wireless router open to code execution after buffer overflow vulnerability

Cisco Talos Vulnerability Research team recently disclosed three vulnerabilities across a range of products, including one that could lead to remote code execution in a popular Netgear wireless router designed for home networks. There is also a newly disclosed vulnerability in a graphics driver f...

Dissecting a complex vulnerability and achieving arbitrary code execution in Ichitaro Word

Cisco Talos disclosed several vulnerabilities in JustSystems Ichitaro Word Processor last year. These vulnerabilities were complex and were discovered through extensive reverse engineering. CVE-2023-35126 and its peers CVE-2023-34366, CVE-2023-38127, and CVE-2023-38128 were each assessed as...

The LockBit story: Why the ransomware affiliate model can turn takedowns into disruptions

In ancient Greek mythos, the mighty Hercules faced a seemingly insurmountable challenge when he encountered the Lernaean Hydra. This fearsome serpent had a terrifying ability: For every head that Hercules severed, two more would spring forth, creating a never-ending cycle of regrowth and renewal...

Not everything has to be a massive, global cyber attack

Some of my Webex rooms recently have been blowing up with memes about blaming Canada or wild speculation that a state-sponsored actor is carrying out some sort of major campaign. After a widespread outage of cellular service with AT&T and other carriers a few weeks ago, people were sure it was so...

Threat actors leverage document publishing sites for ongoing credential and session token theft

Cisco Talos Incident Response Talos IR has observed the ongoing use of legitimate digital document publishing DDP sites for phishing, credential theft and session token theft during recent incident response and threat intelligence engagements. Hosting phishing lures on DDP sites increases the...

Another Patch Tuesday with no zero-days, only two critical vulnerabilities disclosed by Microsoft

For the second month in 2024, there are no actively exploited vulnerabilities included in this months security update from Microsoft. Marchs Patch Tuesday is relatively light, containing 60 vulnerabilities -- only two labeled "critical." Last months Patch Tuesday included more than 70 security...

You’re going to start seeing more tax-related spam, but remember, that doesn’t actually mean there’s more spam

Its that time of the year when not only do you have to be worried about filing your federal taxes in the U.S., you must also be on the lookout for a whole manner of tax-related scams. These are something that pop up every year through email, texts, phone calls and even physical mail -- phony...

The 3 most common post-compromise tactics on network infrastructure

Weve been discussing networking devices quite a lot recently and how Advanced Persistent Threat actors APTs are using highly sophisticated tactics to target aging infrastructure for espionage purposes. Some of these attacks are also likely prepositioning the APTs for future disruptive or...

Badgerboard: A PLC backplane network visibility module

Analysis of the traffic between networked devices has always been of interest since devices could even communicate with one another. As the complexity of networks grew, the more useful dedicated traffic analysis tools became. Major advancements have been made over the years with tools like Snort ...

GhostSec’s joint ransomware operation and evolution of their arsenal

Cisco Talos observed a surge in GhostSec, a hacking groups malicious activities since this past year. GhostSec has evolved with a new GhostLocker 2.0 ransomware, a Golang variant of the GhostLocker ransomware. The GhostSec and Stormous ransomware groups are jointly conducting double extortion...

Heather Couk is here to keep your spirits up during a cyber emergency, even if it takes the “Rocky” music

"Gotta Fly Now" is more closely associated with corporate hype videos or conferences with thousands of attendees in a mid-market citys convention center than it is from its origins in the "Rocky" movies. But Heather Couk thinks its useful in incident response calls, too. Couk, an incident respons...

Why Apple added protection against quantum computing when quantum computing doesn’t even exist yet

Apple released a new update for nearly all its devices that provides an all-new type of encryption for its iMessages to the point that, in theory, iMessages are now protected against attacks from quantum computers. This is a little tricky because, as weve covered before, quantum computers dont...

Multiple vulnerabilities in Adobe Acrobat Reader could lead to remote code execution

Cisco Talos has disclosed more than 30 vulnerabilities in February, including seven in Adobe Acrobat Reader, one of the most popular PDF editing and reading software currently available. Adversaries could exploit these vulnerabilities to trigger the reuse of a previously freed object, thus causin...

Stop running security in passive mode

As we begin a new year, we wanted to address one of the biggest issues we consistently see in our investigations: passive security. Incident response engagements are an important part of our work and the intelligence-gathering process and their associated reports can be a treasure trove of tactic...

TimbreStealer campaign targets Mexican users with financial lures

Cisco Talos has discovered a new campaign operated by a threat actor distributing a previously unknown malware were calling "TimbreStealer." This threat actor was observed distributing TimbreStealer via a spam campaign using Mexican tax-related themes starting in at least November 2023. The threa...

TikTok’s latest actions to combat misinformation shows it’s not just a U.S. problem

When we talk about the term "fake news," most people likely picture a certain person who made the term infamous. And when we talk about misinformation and disinformation, many will remember the "Russian troll farms" that popped up during the 2016 U.S. presidential election and were unmasked and...

TinyTurla-NG in-depth tooling and command and control analysis

Cisco Talos, in cooperation with CERT.NGO, has discovered new malicious components used by the Turla APT. New findings from Talos illustrate the inner workings of the command and control C2 scripts deployed on the compromised WordPress servers utilized in the compromise we previously disclosed...

How CVSS 4.0 changes (or doesn’t) the way we see vulnerability severity

Finding, managing and patching security vulnerabilities on any network, no matter the size, is a tall task. In the first week of 2024 alone, there were 621 new common IT security vulnerabilities and exposures CVEs disclosed worldwide, covering a range of applications, software and hardware that...

Astaroth, Mekotio & Ousaban abusing Google Cloud Run in LATAM-focused malware campaigns

Google Cloud Run is currently being abused in high-volume malware distribution campaigns, spreading several banking trojans such as Astaroth aka Guildma, Mekotio and Ousaban to targets across Latin America and Europe. The volume of emails associated with these campaigns has significantly increase...

Why the toothbrush DDoS story fooled us all

Ill be the first to admit that, like many people on the internet last week, I got caught up in the toothbrush distributed denial-of-service attack that wasnt. I had a whole section on it written up in last weeks newsletter, and then I came across Graham Cluleys blog post debunking the whole thing...

TinyTurla Next Generation - Turla APT spies on Polish NGOs

Cisco Talos has identified a new backdoor authored and operated by the Turla APT group, a Russian cyber espionage threat group. This new backdoor were calling "TinyTurla-NG" TTNG is similar to Turlas previously disclosed implant, TinyTurla, in coding style and functionality implementation. Talos...

How are attackers using QR codes in phishing emails and lure documents?

Though QR codes were once on the verge of extinction, many consumers are used to seeing them in the wild for ordering at restaurants, or as mainstays on storefront doors informing customers how they can sign up for a newsletter or score a sweet deal. The use of QR codes saw a resurgence during th...

First Microsoft Patch Tuesday zero-day of 2024 disclosed as part of group of 75 vulnerabilities

Microsoft followed up one of the lightest recent Patch Tuesdays in January with a large release of vulnerabilities on Tuesday, although still far from numbers seen in the past. In all, Februarys security update from Microsoft includes 75 vulnerabilities, three of which are considered critical...

Spyware isn’t going anywhere, and neither are its tactics

Private and public efforts to curb the use of spyware and activity of other "mercenary" groups have heated up over the past week, with the U.S. government taking additional action against spyware users and some of the worlds largest tech companies calling out international governments to do more...

New Zardoor backdoor used in long-term cyber espionage operation targeting an Islamic organization

By Jungsoo An, Wayne Lee and Vanja Svajcer. Cisco Talos discovered a new, stealthy espionage campaign that has likely persisted since at least March 2021. The observed activity affects an Islamic non-profit organization using backdoors for a previously unreported malware family we have named...

How are user credentials stolen and used by threat actors?

Youve no doubt heard the phrase, "Attackers dont hack anyone these days. They log on." By obtaining or stealing valid user account details, an attacker can gain access to a system, remain hidden, and then elevate their privileges to "log in" to more areas of the network. Unfortunately, the use of...

The many ways electric cars are vulnerable to hacks, and whether that matters in a real-world

Id hate to be labeled a "car guy" now mentioning my new electric car in the lede of two newsletters in a row, but I couldnt resist. Id been reading headlines for years about how electric cars most notably Tesla were vulnerable to a range of security vulnerabilities, even some that could allow bad...

OAS Engine Deep Dive: Abusing low-impact vulnerabilities to escalate privileges

Open Automation Software recently released patches for multiple vulnerabilities in their OAS Engine. Cisco Talos publicly disclosed these issues after working with Open Automation Software to ensure that patches were available for users. Now that a fix has been released with Version 19, we want t...

Why is the cost of cyber insurance rising?

I just bought an electric car last week, so Ive been shopping for new car insurance policies that could offer me a discount for ditching gas. Were all familiar with the boring process of entering the same information 10 times over into 10 different companies websites trying to see who comes out t...

IR Q4 2023 trends: Significant increase in ransomware activity found in engagements, while education remains one of the most-targeted sectors

First time ransomware was the top threat in 2023, according to Q4 2023 Talos Incident Response report Ransomware, including pre-ransomware activity, was the top observed threat in the fourth quarter of 2023, accounting for 28 percent of engagements, according to Cisco Talos Incident Response Talo...

What to do with that fancy new internet-connected device you got as a holiday gift

Welcome to 2024! The Threat Source newsletter is back after our winter break. When I wasnt spending my downtime chasing around my toddler, one of my main projects was to upgrade the internet connection at my house. My ISP started offering Gigabit speeds and a 60 GHz connection, which was appealin...

Exploring malicious Windows drivers (Part 1): Introduction to the kernel and drivers

Drivers have long been of interest to threat actors, whether they are exploiting vulnerable drivers or creating malicious ones. Malicious drivers are difficult to detect and successfully leveraging one can give an attacker full access to a system. Real-world examples can be found in our previous...

Critical vulnerability in ManageEngine could lead to file creation, dozens of other vulnerabilities disclosed by Talos to start 2024

Cisco Talos Vulnerability Research team has disclosed dozens of vulnerabilities over the past month, including more than 30 advisories in GTKWave and a critical vulnerability in ManageEngine OpManager. Cisco ASIG also recently discovered an information disclosure vulnerability in...

Microsoft starts off new year with relatively light Patch Tuesday, no zero-days

Microsoft followed up one of the lightest recent Patch Tuesdays in December with another month of no zero-day vulnerabilities and only two critical issues. Many of the companys monthly security updates in 2023 included vulnerabilities that were actively being exploited in the wild or had publicly...

New decryptor for Babuk Tortilla ransomware variant released

Cisco Talos obtained executable code capable of decrypting files affected by the Babuk Tortilla ransomware variant, allowing Talos to extract and share the private decryption key used by the threat actor. Cisco Talos shared the key with our peers at Avast for inclusion in the Avast Babuk decrypto...

Video series discussing the major threat actor trends from 2023

In this video series, Talos Director of Threat Intelligence and Interdiction Matt Olney and Head of Outreach Nick Biasini share their insights on the most significant cybersecurity threats from the past year. From attacks on network infrastructure to the latest APT activities, as well as an updat...

Intellexa and Cytrox: From fixer-upper to Intel Agency-grade spyware

By Mike Gentile, Asheer Malhotra and Vitor Ventura. Editors note: This blog post is a public version of a talk presented at LabsCon 2023 on Sept. 22, 2023. You can watch a recording of the talk here. Some of the intelligence presented at LabsCon was later confirmed by an Amnesty International blo...

Year in Malware 2023: Recapping the major cybersecurity stories of the past year

If there is anything the cybersecurity world learned in 2023, its that you can never count any bad guy out. Botnets kept coming back from the dead, ransomware actors found new ways to make money through data theft extortion and threat actors and malware who have been around for more than a decade...

A personal Year in Review to round out 2023

As youve probably seen by now, Talos released our 2023 Year in Review report last week. Its an extremely comprehensive look at the top threats, attacker trends and malware families from the past year with never-before-seen Cisco Talos telemetry. We have podcasts, long-form videos and even Reddit...

Recommendations that defenders can use from Talos’ Year in Review Report

The Talos Year in Review is available now and contains a wealth of insights about how the threat landscape has shifted in 2023. With new ransomware strains emerging from leaked source code, commodity loaders adding more reconnaissance measures to their belts, and geopolitical events influencing A...

Microsoft releases lightest Patch Tuesday in three years, no zero-days disclosed

Microsofts monthly security update released Tuesday is the companys lightest in four years, including only 33 vulnerabilities. Perhaps more notable is that there are no zero-day vulnerabilities included in Decembers Patch Tuesday, a rarity for Microsoft this year. The companys regular set of...

Operation Blacksmith: Lazarus targets organizations worldwide using novel Telegram-based malware written in DLang

Cisco Talos recently discovered a new campaign conducted by the Lazarus Group were calling "Operation Blacksmith," employing at least three new DLang-based malware families, two of which are remote access trojans RATs, where one of these uses Telegram bots and channels as a medium of command and...

Video: Talos 2023 Year in Review highlights

In this video, experts from across Cisco Talos came together to discuss the 2023 Talos Year in Review. We chat about whats new, whats stayed the same, and how the geopolitical environment has affected the threat landscape. This video was recorded live on social media: Read the 2023 Cisco Talos Ye...

Cybersecurity considerations to have when shopping for holiday gifts

As I wrote about last week, there are holiday shopping-related scams already popping up all over the place. But another aspect of security that many shoppers dont consider this time of year is the security of the products theyre buying, even through a legitimate online marketplace. This is a...

Remote code execution vulnerabilities found in Buildroot, Foxit PDF Reader

Cisco Talos has disclosed 10 vulnerabilities over the past two weeks, including nine that exist in a popular online PDF reader that offers a browser plugin. Attackers could exploit these vulnerabilities in the Foxit PDF Reader to carry out a variety of malicious actions, but most notably could ga...