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April 17, 2023

QBot banker delivered through business correspondence

In early April, we detected a significant increase in attacks that use banking Trojans of the QBot family. The malware would be delivered through e-mails that were based on real business letters the attackers had gotten access to.

CVE-2023-21554: MSMQ

On April 12th, 2023, Microsoft released a slew of new patches for its Windows operating system, one of which was to fix CVE-2023-21554, a remotely-exploitable vulnerability in the obscure Windows Message Queuing (MSMQ) service that can lead to remote code execution (RCE).

Analyzing an arm64 mach-O version of LockBit

The relevance of this macOS specimen is well articulated in their tweet:

“Lockbit ransomware group has created their first MacOS-based payload. We believe this is the first time a large ransomware threat group has developed a payload for Apple products.” vx-underground

Ok, so even though it’s the weekend, we have what appears to be a new macOS malware specimen from one of the more notorious ransomware gangs! Coupled with the fact that this may be, (as noted by @VXUnderground), “the first time a large ransomware threat group has developed a payload for Apple products” …I was intrigued to decided to dig right in!

Linux kernel logic allowed Spectre attack on major cloud

Kernel 6.2 ditched a useful defense against ghostly chip design flaw