As is the case with many technologies, BITS can be used both by legitimate applications and by attackers. When malicious applications create BITS jobs, files are downloaded or uploaded in the context of the service host process. This can be useful for evading firewalls that may block malicious or unknown processes, and it helps to obscure which application requested the transfer. BITS transfers can also be scheduled allowing them to occur at specific times without relying on long-running processes or the task scheduler.
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In 2020 Mandiant responded to many incidents involving Ryuk ransomware operators leveraging custom backdoors and loaders to actively target hospitals and other medical support centers (see our blog post Unhappy Hour Special: KEGTAP and SINGLEMALT With a Ransomware Chaser). Through numerous engagements Mandiant was able to profile the attacker's Tools Techniques and Procedures (TTPs) and identify unique aspects of the various backdoors and loaders that were leveraged prior to encryption. In one such engagement, Mandiant consultants had mapped the vast majority of the attack timeline from initial exploitation to the encryption of corporate resources and an extortion demand. Log analysis and telemetry provided by the customer's on-premises endpoint detection solution led to the identification of a KEGTAP backdoor on an end-user workstation. Mandiant was able to identify the specific email and lure used by the ransomware operators including the download and execution of the file mail.exe, which launched KEGTAP. However, none of the persistence mechanisms that Mandiant observed in other engagements were present on this endpoint.
On May 24, 2021, researchers from ClearSky determined that the North Korean state-sponsored group Lazarus was behind multiple attacks on cryptocurrency exchanges, previously attributed to a threat actor they named CryptoCore.
On May 24, 2021, researchers from ClearSky determined that the North Korean state-sponsored group Lazarus was behind multiple attacks on cryptocurrency exchanges, previously attributed to a threat actor they named CryptoCore. The group is believed to have stolen hundreds of millions of U.S. dollars by breaching cryptocurrency exchanges in the U.S., Israel, Europe, and Japan over the past three years.
While lead has limited activation from neutrons, a problem with Pb-Bi is that it yields toxic polonium (Po-210) activation product, an alpha-emitter with a half-life of 138 days. Pb-Bi melts at a relatively low 125C (hence eutectic) and boils at 1670C, Pb melts at 327C and boils at 1737C but is very much more abundant and cheaper to produce than bismuth, hence is envisaged for large-scale use in the future, though freezing must be prevented. In 1998 Russia declassified a lot of research information derived from its experience with Pb-Bi in submarine reactors, and US interest in using Pb generally or Pb-Bi for small reactors has increased subsequently.
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