Post Syndicated from Emma Burdett original https://www.rapid7.com/blog/post/it-asos-incident-attackers-using-channels-customers-trust
ASOS customers opened their phones to find a hostile push notification delivered through the retailer’s own app. The message claimed the company’s Snowflake environment had been compromised and directed ASOS to engage with the sender through Telegram. ASOS later confirmed to Sky News that an unauthorized customer notification had been sent and said it was investigating activity involving third-party platforms used to communicate with customers. The company also said basic personal information, including names and contact details, may have been accessed, while payment-card information and account passwords were not believed to be affected.
The attackers’ wider claims remain unverified, and Snowflake told Sky News that its investigation had found no compromise of the Snowflake platform at that point. Even without knowing the full route into ASOS’s environment, though, the notification raises a useful question for security teams: what happens when an attacker can communicate through a channel customers already trust?
When the message comes from the real app
Most security awareness advice assumes there will be something suspicious for the recipient to notice. The sender might be unfamiliar, the domain slightly wrong, or the request out of character. Those checks become much less useful when the message arrives through the genuine app sitting on someone’s phone.
Attackers have already been moving in this direction elsewhere. Rapid7 research into calendar-based phishing showed how malicious content can appear inside familiar workflows, while our earlier look at how social engineering is evolving explored the growing use of collaboration tools and other everyday platforms to make attacks feel routine.
The ASOS incident moves that problem into a customer-facing environment. Once an attacker has access to a system that can speak on behalf of a business, the trust built around that system can work in the attacker’s favor too.
“Let’s face it, an attacker would much rather borrow trust that already exists than spend time building their own. Our recent Zimbra research is a good example, because once you can impersonate a sender or edit a calendar from inside the platform, everything the victim checks lives in a system they have no reason to question. I can’t say how this one happened, but a notification coming out of a real app gives an attacker that same head start. There is no strange domain or unfamiliar sender to catch, so the activity can look a lot like a normal Tuesday afternoon.” Douglas McKee, Director, Vulnerability Intelligence at Rapid7
What suspicious activity looks like inside legitimate services
An attacker does not always need obviously malicious infrastructure to create damage. A legitimate account, integration, or SaaS platform used in an unexpected way can provide access to employees, customers, or partners while generating activity that may look relatively ordinary when viewed on its own.
If a customer communications service suddenly sends an unusual notification, the security team needs to understand what happened around it: who accessed the platform, whether credentials or permissions changed, which connected services were involved, and whether suspicious activity appeared elsewhere in the environment.
ASOS said the activity involved third-party platforms used for customer communications, while TechRadar reported that the claimed Snowflake connection could potentially have been indirect through services running on the platform rather than evidence of a compromise of Snowflake itself. That kind of environment can leave investigators working across several providers, identities, and systems before they have a complete picture of what happened.
MDR has to follow the activity across the environment
When attackers use legitimate identities, integrations, cloud services, or communication platforms, analysts need to connect behavior across systems rather than depend on a known-bad IP address or malware signature to tell the story. An unexpected authentication, a permission change, third-party access, or unusual activity from a customer-facing service may not be enough to raise the alarm independently, but the sequence can reveal a much clearer pattern.
A preemptive MDR approach brings those signals together across endpoints, identities, cloud environments, and other parts of the attack surface so analysts can investigate the activity in context. Businesses now rely on a growing number of SaaS services and external platforms that can act on their behalf, and although security teams may not operate every one of those systems directly, they still need to understand what access they hold, how they connect to the wider environment, and how misuse would surface.
That becomes particularly relevant when a third-party service can communicate externally in the organization’s name. Access to the platform is only part of the picture; teams also need visibility into how that access is being used and whether activity elsewhere suggests the account or integration has been compromised.
The first message can create a second wave of risk
A visible incident can give other attackers useful material. Once customers know something has happened, a phishing email or text offering an account update, refund, password reset, or security check immediately has a credible event behind it.
Rapid7 research into digital footprint exposure has shown how breached information can be combined with publicly available data to support more convincing phishing, impersonation, and fraud. Names and contact details may appear relatively limited compared with passwords or payment information, but they can still become valuable when combined with a real incident and a recognizable brand.
The investigation therefore has to support several decisions at once: understanding the technical scope, establishing which customer or business data may have been involved, working with third-party providers, assessing regulatory obligations, and preparing for the possibility that the incident will be reused in follow-on attacks.
As more customer communication moves through apps, SaaS platforms, automated workflows, and third-party services, security teams need visibility into how those channels are being used as well as who can access them. The earlier unusual activity can be connected across those systems, the more room analysts have to investigate and respond before a trusted channel becomes part of a much larger incident.