[CHOPSTICK](https://attack.mitre.org/software/S0023) is a malware family of modular backdoors used by [APT28](https://attack.mitre.org/groups/G0007). It has been used since at least 2012 and is usually dropped on victims as second-stage malware, though it has been used as first-stage malware in several cases. It has both Windows and Linux variants. (Citation: FireEye APT28) (Citation: ESET Sednit Part 2) (Citation: FireEye APT28 January 2017) (Citation: DOJ GRU Indictment Jul 2018) It is tracked separately from the [X-Agent for Android](https://attack.mitre.org/software/S0314).