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Clarify language re: firmware-based threats

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Keith McCammon
2020-10-10 09:51:41 -06:00
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commit 9e401054bb
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windows/security/threat-protection/intelligence/fileless-threats.md
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@ -43,7 +43,7 @@ A fully fileless malware can be considered one that never requires writing a fil
A compromised device may also have malicious code hiding in device firmware (such as a BIOS), a USB peripheral (like the BadUSB attack), or in the firmware of a network card. All these examples don't require a file on the disk to run, and can theoretically live only in memory. The malicious code would survive reboots, disk reformats, and OS reinstalls. A compromised device may also have malicious code hiding in device firmware (such as a BIOS), a USB peripheral (like the BadUSB attack), or in the firmware of a network card. All these examples don't require a file on the disk to run, and can theoretically live only in memory. The malicious code would survive reboots, disk reformats, and OS reinstalls.
Infections of this type can be extra difficult deal with because antivirus products usually don’t have the capability to inspect firmware. Even if they did, it would be extremely challenging to detect and remediate threats at this level. This type of fileless malware requires high levels of sophistication and often depends on particular hardware or software configuration. It’s not an attack vector that can be exploited easily and reliably. While dangerous, threats of this type are uncommon and not practical for most attacks. Infections of this type can be particularly difficult to detect because most antivirus products don’t have the capability to inspect firmware. In cases where a product does have the ability to inspect and detect malicious firmware, there are still significant challenges associated with remediation of threats at this level. This type of fileless malware requires high levels of sophistication and often depends on particular hardware or software configuration. It’s not an attack vector that can be exploited easily and reliably. While dangerous, threats of this type are uncommon and not practical for most attacks.
## Type II: Indirect file activity ## Type II: Indirect file activity