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Black Arrow Cyber Advisory 30 August 2023 – Think Opening PDFs is Safe?

Black Arrow Cyber Alert 30 August 2023 – Think Opening PDFs is Safe?

This alert covers a recent change in attacker tools, tactics and procedures (TTPs) and is intended to raise awareness so that organisations can defend against these evolving attacks, where necessary through educating their staff and users on these latest changes.

Executive Summary

Research from the Japanese Computer Emergency Response Team (JPCERT) has found that hackers are utilising polygots, which are files that feature two formats and can be executed as more than one file type, to conduct attacks. Specifically, malicious word documents are being hidden within PDF documents to escape detection software.

What’s the risk to me or my business?

There is a risk if the disguised polygot is opened as a word document rather than a PDF document then it will enable a macro to run. The macro will then cause the victims device to download and install malware, impacting the confidentiality, integrity and availability of data. Worryingly, whether the polgygot opens as a PDF or Word document is dependant on the application opening it.

What can I do?

Microsoft’s default security setting is to disable macros from running on Microsoft Office files, and only files that were not downloaded from the internet can have macros enabled without going through multiple steps. Even with this control in place, organisations should remain vigilant and be aware that PDF files, like anything else, are susceptible to malicious modification.

Further information can be found below:

https://www.bleepingcomputer.com/news/security/maldoc-in-pdfs-hiding-malicious-word-docs-in-pdf-files/

Need help understanding your gaps, or just want some advice? Get in touch with us.

#threatadvisory #threatintelligence #cybersecurity

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Black Arrow Cyber Threat Briefing 12 August 2022

Black Arrow Cyber Threat Briefing 12 August 2022

-Three Ransomware Gangs Consecutively Attacked the Same Network

-As The Cost of Cyber Insurance Rises, The Number of Organisations Who Can’t Afford It Is Set to Double

-Identity Cyber Attacks, Microsoft 365 Dominate Cybersecurity Incidents, Expel Research Finds

-Exploit Activity Surges 150% in Q2 Thanks to Log4Shell

-Ransomware Is Not Going Anywhere: Attacks Are Up 24%

-Email Is the Single Biggest Threat to Businesses, And Here’s What You Can Do About It

-Realtek SDK Vulnerability Exposes Routers from Many Vendors to Remote Attacks

-Most Companies Are at An Entry-Level When It Comes to Cloud Security

-The Impact of Exploitable Misconfigurations on Network Security

-Industrial Spy Ransomware: New Threat Group Emerges to Exfiltrate Data, Extort Victims

-UK NHS Service Recovery May Take a Month After MSP Ransomware Attack

-A Single Flaw Broke Every Layer of Security in MacOS

Welcome to this week’s Black Arrow Cyber Threat Briefing – a weekly digest, collated and curated by our cyber experts to provide senior and middle management with an easy to digest round up of the most notable threats, vulnerabilities, and cyber related news from the last week.

Top Cyber Stories of the Last Week

  • Three Ransomware Gangs Consecutively Attacked the Same Network

Hive, LockBit and BlackCat, three prominent ransomware gangs, consecutively attacked the same network, according to Sophos. The first two attacks took place within two hours, and the third attack took place two weeks later. Each ransomware gang left its own ransom demand, and some of the files were triple encrypted.

It’s bad enough to get one ransomware note, let alone three. Multiple attackers create a whole new level of complexity for recovery, particularly when network files are triple encrypted. Cyber security that includes prevention, detection and response is critical for organisations of any size and type—no business is immune.

The “Multiple Attackers: A Clear and Present Danger” whitepaper further outlines additional cases of overlapping cyber attacks, including cryptominers, remote access trojans (RATs) and bots. In the past, when multiple attackers have targeted the same system, the attacks usually occurred across many months or multiple years. The attacks described in Sophos’ whitepaper took place within days or weeks of each other—and, in one case, simultaneously—often with the different attackers accessing a target’s network through the same vulnerable entry point.

Typically, criminal groups compete for resources, making it more difficult for multiple attackers to operate simultaneously. Cryptominers normally kill their competitors on the same system, and today’s RATs often highlight bot killing as a feature on criminal forums. However, in the attack involving the three ransomware groups, for example, BlackCat—the last ransomware group on the system—not only deleted traces of its own activity, but also deleted the activity of LockBit and Hive.

In another case, a system was infected by LockBit ransomware. Then, about three months later, members of Karakurt Team, a group with reported ties to Conti, was able to leverage the backdoor LockBit created to steal data and hold it for ransom.

https://www.helpnetsecurity.com/2022/08/09/ransomware-gangs-attacks/

  • As The Cost of Cyber Insurance Rises, The Number of Organisations Who Can’t Afford It Is Set to Double

The number of organisations that will be either unable to afford cyber insurance, be declined cover, or experience significant coverage limitations is set to double in 2023, according to Huntsman Security.

Even for those insured, the perfect storm of ongoing attacks, tightening regulations and growing financial pressures is making it more likely that any attack on an organisation will leave it exposed.

Factors like the supply chain crisis, inflation and skill shortages are all adding to the difficulty for organisations trying to execute on their cyber security strategy. At the same time, increases in insurance premiums, limits on coverage, increasing underwriting rigour, and capacity constraints are all limiting the accessibility of cyber insurance, for many.

Loss ratios will not improve until premium incomes better match the current level of pay-outs. With this reduced insurance access alongside increasing cyber threats and tightening regulations, many organisations are losing cyber insurance as an important risk management tool. Even those who can still get insurance are paying a prohibitively high cost.

With a third of UK firms subject to cyber attacks at least once a week, cyber insurance as part of overall risk management is crucial. To bridge this accessibility gap insurers are seeking to improve the quality of risk information, so premiums better reflect the true cost of that risk. Unless organisations can demonstrate they have insurers’ specified controls in place to manage their security risks, insurers will continue to have difficulty quantifying that risk. It’s for these reasons that insurers have changed the basis upon which their products are offered to reflect the risk being underwritten more accurately.

In this environment, improving and demonstrating the effectiveness of security controls will now be essential: both for organisations looking to improve their cyber resilience and oversight while enhancing their eligibility for insurers, and for insurers who need to minimise their own exposure by ensuring the accuracy of their risk pricing process.

https://www.helpnetsecurity.com/2022/08/11/afford-cyber-insurance/

  • Identity Cyber Attacks, Microsoft 365 Dominate Cyber Security Incidents, Expel Research Finds

Identity-based cyber attacks (including credential theft, credential abuse and long-term access key theft) accounted for 56% of all incidents in Q2 of 2022, and Microsoft 365 remained the prime target for SaaS attacks, according to Expel’s Quarterly Threat Report.

Among the key findings:

  • Business email compromise (BEC) and business application compromise (BAC) access to application data represented 51% of all incidents.

  • Identity-based attacks in popular cloud environments like Amazon Web Services (AWS) accounted for 5%.

  • Ransomware groups change tactics, with threat groups and their affiliates all but abandoning the use of Visual Basic for Application (VBA) macros and Excel 4.0 macros to gain initial entry to Windows-based environments. In Q1, a macro-enabled Microsoft Word document (VBA macro) or Excel 4.0 macro was the initial attack vector in 55% of all pre-ransomware incidents. In Q2, that figure fell sharply to 9%. Instead, ransomware operators opted to use disk image (ISO), short-cut (LNK) and HTML application (HTA) files to gain initial entry.

  • Cloud attacks are becoming more sophisticated, with 14% of identity attacks against cloud identity providers tackling the multi-factor authentication (MFA) requirement by continuously sending push notifications.

  • Microsoft 365 is a common threat target, with BEC in Microsoft Office 365 (O365) remaining the top threat to organisations in Q2. 45% of all Q2 incidents were BEC attempts in O365. No BEC attempts were identified in Google Workspaces. 19% of BEC attempts bypassed MFA in O365 using legacy protocols, a 16% increase of compared to Q1.

https://www.msspalert.com/cybersecurity-research/identity-cyberattacks-targeting-microsoft-365-dominate-cybersecurity-incidents-expel-research-finds/

  • Exploit Activity Surges 150% in Q2 Thanks to Log4Shell

Detections of malware events, botnet activity and exploits all increased significantly in the second quarter of 2022, according to new data from Nuspire.

The managed security services provider (MSSP) gathered the data from its endpoint detection and response (EDR) and managed detection and response (MDR) tools to produce its Q2 2022 Quarterly Threat Report.

The company recorded an increase in malware events of over 25%, a doubling of botnet detections and a rise in exploit activity of 150% versus the first quarter.

Botnet activity in particular surged towards the end of Q2, thanks to the Torpig Mebroot botnet – a banking trojan designed to scrape credit card and payment information from infected devices, the report revealed. Nuspire claimed it is particularly difficult to detect and remove, because it targets a machine’s master boot record.

It attributed much of the surge in exploit activity to the persistent threat posed by the Log4j bugs discovered at the end of December 2021. At the time, experts warned that the ubiquity of the utility, and the difficulty many organisations have in finding all instances of the CVE due to complex Java dependencies, means it may be exploited for years.

https://www.infosecurity-magazine.com/news/exploit-activity-150-q2-log4shell/

  • Ransomware Is Not Going Anywhere: Attacks Are Up 24%

Avast released a report revealing a significant increase in global ransomware attacks, up 24% from Q1/2022. Researchers also uncovered a new zero-day exploit in Chrome, as well as signals of how cyber criminals are preparing to move away from macros as an infection vector.

After months of decline, global ransomware attacks increased significantly in Q2/2022, up 24% from the previous quarter. The highest quarter-on-quarter increases in ransomware risk ratio occurred in Argentina (+56%), UK (+55%), Brazil (+50%), France (+42%), and India (+37%).

Businesses and consumers should be on guard and prepared for encounters with ransomware, as the threat is not going anywhere anytime soon.

The decline in ransomware attacks observed in Q4/2021 and Q1/2022 were thanks to law enforcement agencies busting ransomware group members, and caused by the war in Ukraine, which also led to disagreements within the Conti ransomware group, halting their operations. Things dramatically changed in Q2/2022. Conti members have now branched off to create new ransomware groups, like Black Basta and Karakurt, or may join other existing groups, like Hive, BlackCat, or Quantum, causing an uptick in activity.

https://www.helpnetsecurity.com/2022/08/12/increase-ransomware-attacks/

  • Email Is the Single Biggest Threat to Businesses, And Here’s What You Can Do About It

Email remains one of the most popular methods of communication, particularly for business communications. There were 316.9 billion emails sent and received every day in 2021, and this is set to increase to 376.4 billion by 2025. But despite the scale of its use and how much people exchange confidential information over email, it is not a secure system by design.

Consequently, email is a major attack vector for organisations of all sizes. Deloitte found that 91% of all cyber attacks originate from a phishing email (an email that attempts to steal money, identity or personal information through a spoof website link that looks legitimate). The cost to organisations can be catastrophic with the National Cyber Security Centre (NCSC) reporting in August 2021 that phishing email attacks had cost UK organisations more than £5 million in the past 13 months.

It’s not enough for individuals to create complex passwords or rely on the security services of their email provider. Spam filters are not enough to stop malicious emails creeping into inboxes. Fortunately, safeguarding your emails with enterprise-grade email security doesn’t have to cost the earth or be hard to integrate so businesses of any size can protect themselves.

https://informationsecuritybuzz.com/articles/email-is-the-single-biggest-threat-to-businesses-and-heres-what-you-can-do-about-it/

  • Realtek SDK Vulnerability Exposes Routers from Many Vendors to Remote Attacks

A serious vulnerability affecting the embedded Configurable Operating System (eCos) software development kit (SDK) made by Taiwanese semiconductor company Realtek could expose the networking devices of many vendors to remote attacks.

The security hole, tracked as CVE-2022-27255 and rated ‘high severity’, has been described as a stack-based buffer overflow that can allow a remote attacker to cause a crash or achieve arbitrary code execution on devices that use the SDK. An attack can be carried out through the wide area network (WAN) interface using specially crafted session initiation protocol (SIP) packets.

The Realtek eCos SDK is provided to companies that manufacture routers, access points and repeaters powered by RTL819x family SoCs. The SDK implements the base functionalities of the router, including the web administration interface and the networking stack. Vendors can build on top of this SDK to add custom functionality and their branding to the device.

Realtek informed customers about the eCos SDK vulnerability in March, when it announced the availability of a patch. However, it’s up to the original equipment manufacturer (OEM) using the SDK to ensure that the patch is distributed to end-user devices.

The vulnerability can be exploited remotely — directly from the internet — to hack affected routers running with default settings. No user interaction is required for successful exploitation.

https://www.securityweek.com/realtek-sdk-vulnerability-exposes-routers-many-vendors-remote-attacks

  • Most Companies Are at An Entry-Level When It Comes to Cloud Security

Ermetic released a study by Osterman Research that found 84% of respondents were at an entry-level (one or two rating, with four being the highest) in terms of their cloud security capabilities.

The study found that only 16% ranked on the Ermetic Cloud Security Model at the top two levels, and 80% of companies said they lack a dedicated security team responsible for protecting cloud resources from threats.

“One of the most unexpected findings that emerged from this study was the lack of cloud security maturity among the largest enterprises surveyed,” said the author of the report. “Less than 10% of companies with more than 10,000 employees reported being at the top two maturity levels, while nearly 20% of smaller enterprises have achieved repeatable or automated & integrated cloud security capabilities.”

The report shows why new cloud data breaches are being reported all the time. Multi-cloud deployments, plus low investment in security, does not make for a good combination.

The new frontiers of cyber security, such as cloud security or internet of things (IoT) security are often at early stages of maturity. Organisations that are mature in their IT and data centre security are already overwhelmed and stretched thin and that’s why automation and simplification will help organisations accelerate their maturity in areas like cloud security.

There’s a mistaken belief that cloud computing environments inherently have security built-in — they don’t.

https://www.scmagazine.com/news/cloud-security/most-companies-are-at-an-entry-level-when-it-comes-to-cloud-security

  • The Impact of Exploitable Misconfigurations on Network Security

Network professionals feel confident with their security and compliance practices but data suggests that they also leave their organisations open to risk, which is costing a significant amount of revenue, according to Titania.

In addition, some businesses are not minimising their attack surface effectively. Companies are prioritising firewall security and chronicle a fast time to respond to misconfigurations when detected in annual audits. However, switches and routers are only included in 4% of audits and these devices play a vital role in reducing an organisation’s attack surface and preventing lateral movement across the network.

Respondents also indicated that financial resources allocated to mitigating network configuration, which currently stands around 3.4% of the total IT budget, and a lack of accurate automation are limiting factors in misconfiguration risk management.

The study, which surveyed 160 senior cyber security decision-makers revealed:

  • Misconfigurations cost organisations millions, up to 9% of their annual revenue but the true cost is likely to be higher.

  • Compliance is a top priority, with 75% of organisations across all sectors saying their business relies on compliance to deliver security. Whilst almost every organisation reported that it is meeting its security and compliance requirements, this is at odds with a number of the other findings from the survey and other reports that show a decline in organisations maintaining full compliance with regulated data security standards.

  • Remediation prioritisation is a challenge. 75% said their network security tools meant they could categorise and prioritise compliance risks ‘very effectively’. However, 70% report difficulties prioritising remediation based on risk and also claim inaccurate automation as the top challenges when meeting security and compliance requirements.

  • Routers and switches are mostly overlooked. 96% of organisations prioritise the configuration and auditing of firewalls, but not routers or switches. This leaves these devices exposed to potentially significant and unidentified risks.

https://www.helpnetsecurity.com/2022/08/12/impact-exploitable-misconfigurations-network-security/

  • Industrial Spy Ransomware: New Threat Group Emerges to Exfiltrate Data, Extort Victims

A new ransomware group dubbed Industrial Spy that first emerged in April 2022 is specialising in exfiltration and double extortion tactics and has the potential to do significant damage, Zscaler’s threat tracking team said.

The threat crew has shown that it possesses the capability to breach organisations and have been “actively adding unencrypted data from two or three victims every month,” Zscaler said. In some instances, the threat group appears to only exfiltrate and ransom data. In other cases, they encrypt, exfiltrate and ransom the data, the cloud security provider said.

At this point, it’s not clear who’s behind the threat entry or if it’s nation-state affiliated. The group started as a data extortion marketplace where criminals could buy large companies’ internal data, promoting the marketplace through Readme.txt files downloaded using malware downloaders.

In May, 2022, the threat group introduced their own ransomware to create double extortion attacks that combine data theft with file encryption.

What you need to know:

  • Industrial Spy started by ransoming stolen data and more recently has combined these attacks with ransomware.

  • The threat group exfiltrates and sells data on their dark web marketplace, but does not always encrypt a victim’s files.

  • The ransomware utilises a combination of RSA and 3DES to encrypt files.

  • Industrial Spy lacks many common features present in modern ransomware families.

  • The Industrial Spy ransomware family is relatively basic, and parts of the code appear to be in development.

https://www.msspalert.com/cybersecurity-breaches-and-attacks/ransomware/new-ransomware-family-industrial-spy-emerges-to-exfiltrate-data-extort-victims/

  • UK NHS Service Recovery May Take a Month After MSP Ransomware Attack

Managed service provider (MSP) Advanced confirmed that a ransomware attack on its systems disrupted emergency services (111) from the United Kingdom's National Health Service (NHS). Customers of seven solutions from the British MSP have been impacted either directly or indirectly, the company said. The first has stated it could take a month to recover systems to full service.

The ransomware attack started to disrupt Advanced systems on Thursday, August 4 and was identified around 7 AM. It caused a major outage to NHS emergency services across the UK.

Advanced did not disclose the ransomware group behind the attack but said that it took immediate action to mitigate the risk and isolated Health and Care environments where the incident was detected. The company is working with forensic experts from Microsoft (DART) and Mandiant, who are also helping bring the affected systems back online securely and with added defences:

  • Implementing additional blocking rules and further restricting privileged accounts for Advanced staff

  • Scanning all impacted systems and ensuring they are fully patched

  • Resetting credentials

  • Deploying additional endpoint detection and response agents

  • Conducting 24/7 monitoring

After implementing the security measures above, Advanced said it would restore connectivity to its environments and assist customers to gradually reconnect safely and securely.

https://www.bleepingcomputer.com/news/security/uk-nhs-service-recovery-may-take-a-month-after-msp-ransomware-attack/

  • A Single Flaw Broke Every Layer of Security in MacOS

Every time you shut down your Mac, a pop-up appears: “Are you sure you want to shut down your computer now?” Nestled under the prompt is another option most of us likely overlook: the choice to reopen the apps and windows you have open now when your machine is turned back on. Researchers have now found a way to exploit a vulnerability in this “saved state” feature—and it can be used to break the key layers of Apple’s security protections.

The vulnerability, which is susceptible to a process injection attack to break macOS security, could allow an attacker to read every file on a Mac or take control of the webcam. It's basically one vulnerability that could be applied to three different locations.

https://www.wired.com/story/a-single-flaw-broke-every-layer-of-security-in-macos/

Threats

Ransomware

Phishing & Email Based Attacks

Other Social Engineering; SMishing, Vishing, etc

Malware

Mobile

Internet of Things – IoT

Organised Crime & Criminal Actors

Cryptocurrency/Cryptomining/Cryptojacking/NFTs/Blockchain

Fraud, Scams & Financial Crime

AML/CFT/Sanctions

Insurance

Cloud/SaaS

Open Source

Social Media

Training, Education and Awareness

Privacy

Travel

Parental Controls and Child Safety

Models, Frameworks and Standards

Spyware, Cyber Espionage & Cyber Warfare, including Russian Invasion of Ukraine

Vulnerabilities

Sector Specific

Industry specific threat intelligence reports are available.

Contact us to receive tailored reports specific to the industry/sector and geographies you operate in.

·       Automotive

·       Construction

·       Critical National Infrastructure (CNI)

·       Defence & Space

·       Education & Academia

·       Energy & Utilities

·       Estate Agencies

·       Financial Services

·       FinTech

·       Food & Agriculture

·       Gaming & Gambling

·       Government & Public Sector (including Law Enforcement)

·       Health/Medical/Pharma

·       Hotels & Hospitality

·       Insurance

·       Legal

·       Manufacturing

·       Maritime

·       Oil, Gas & Mining

·       OT, ICS, IIoT, SCADA & Cyber-Physical Systems

·       Retail & eCommerce

·       Small and Medium Sized Businesses (SMBs)

·       Startups

·       Telecoms

·       Third Sector & Charities

·       Transport & Aviation

·       Web3

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