Graph: Growing number of threats leveraging Microsoft API

An increasing number of threats have begun to leverage the Microsoft Graph API, usually to facilitate communications with command-and-control (C&C) infrastructure hosted on Microsoft cloud services.

The technique was most recently used in an attack against an organization in Ukraine, where a previously undocumented piece of malware used the Graph API to leverage Microsoft OneDrive for C&C purposes.

Read more…
Source: Symantec

Sign up for our Newsletter


  • New PowerExchange malware backdoors Microsoft Exchange servers

    May 24, 2023

    A new PowerShell-based malware dubbed PowerExchange was used in attacks linked to APT34 Iranian state hackers to backdoor on-premise Microsoft Exchange servers. After infiltrating the mail server via a phishing email containing an archived malicious executable, the threat actors deployed a web shell named ExchangeLeech (first observed by the Digital14 Incident Response team in 2020) that ...

  • Why Microsoft just patched a patch that squashed an under-attack Outlook bug

    May 12, 2023

    Microsoft in March fixed an interesting security hole in Outlook that was exploited by miscreants to leak victims’ Windows credentials. This week the IT giant fixed that fix as part of its monthly Patch Tuesday update. To remind you of the original bug, tracked as CVE-2023-23397: it was possible to send someone an email that included ...

  • Two Microsoft Windows bugs under attack, one in Secure Boot with a manual fix

    May 9, 2023

    May’s Patch Tuesday brings some good and some bad news, and if you’re a glass-half-full type, you’d lead off with Microsoft’s relatively low number of security fixes: a mere 38. Your humble vulture, however, is a glass-half-empty-and-who-the-hell-drank-my-whiskey kind of bird, so instead of looking on the bright side, we’re looking at the two Microsoft bugs that ...

  • Microsoft is busy rewriting core Windows code in memory-safe Rust

    April 27, 2023

    Microsoft is rewriting core Windows libraries in the Rust programming language, and the more memory-safe code is already reaching developers. David “dwizzle” Weston, director of OS security for Windows, announced the arrival of Rust in the operating system’s kernel at BlueHat IL 2023 in Tel Aviv, Israel, last month. Read more… Source: The Register  

  • How fiends abuse an out-of-date Microsoft Windows driver to infect victims

    April 24, 2023

    Ransomware spreaders have built a handy tool that abuses an out-of-date Microsoft Windows driver to disable security defenses before dropping malware into the targeted systems. This detection evasion utility, which Sophos X-Ops researchers are calling AuKill, is the latest example in a growing trend where miscreants either abuse a legitimate driver to disable, silence or otherwise ...

  • Medusa ransomware crew brags about spreading Bing, Cortana source code

    April 20, 2023

    The Medusa ransomware gang has put online what it claims is a massive leak of internal Microsoft materials, including Bing and Cortana source code. “This leak is of more interest to programmers, since it contains the source codes of the following Bing products, Bing Maps and Cortana,” the crew wrote on its website, which was screenshotted ...