Author: Sanchit Karve

Sanchit Karve Sanchit works at McAfee Labs’ Threat Intelligence & Escalations team as an Anti-Malware Researcher. He’s involved in malware research, authoring detection and repair code as well as monitoring complex cyber threats and APTs. His research on the Beebone botnet that led to its takedown was recently awarded the Péter Ször Award by Virus Bulletin for Best Technical Security Research in 2015.

W32/NionSpy is a family of malware that steals information from infected machines and replicates to new machines over networks and removable thumb drives. Aside from stealing keystrokes, passwords, Bitcoins, system information, and files on disk, NionSpy (also known as Mewsei and MewsSpy) can record video (using the webcam), audio (using the microphone), take screenshots, and […]

The W32/Worm-AAEH family (aliases: Beebone, VObfus, Changeup) of Trojans/downloaders/worms has been notorious for consistently morphing itself and switching control servers since June 2009. In June 2013, the AAEH worm made its biggest cosmetic change since 2009 by packaging an entire encrypted binary (containing all the malicious W32/Worm-AAEH code) inside its signature cryptor, which previously held only […]

The Dofoil downloader (found in the wild since 2011) occasionally updates itself with new features and encryption techniques to hide communications with its control servers. The latest iteration uses a variation of XOR and RC4 algorithms similar to previous variants to encrypt the list of control servers within the binary and encrypt all traffic with […]

McAfee Labs has recently come across a number of malware samples that drop Zbot and Necurs rootkits. These use a discreet technique to intentionally crash Windows XP. Interestingly, the malware achieves its OS awareness without using any standard Windows API functions. Instead, it relies on the differences in default register values as well as its […]

  Update: 4/11/2014 McAfee’s Heartbleed Test tool has been posted and enables users to test sites for the presence of this vulnerability. ———- A recent vulnerability in OpenSSL is causing quite a stir. Documented as CVE-2014-0160, this vulnerability has a significant impact on the perceived security of a number servers across the globe. One of […]