Cyber espionage hacker group has resurfaced with new intrusions targeting four companies this year, including one of the largest wholesale stores in Russia, while simultaneously making tactical improvements to its toolset in an attempt to thwart analysis.

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RedCurl hacking group has been linked to 30 attacks to date with the goal of corporate cyber espionage and document theft aimed at 14 organizations spanning construction, finance, consulting, retail, insurance, and legal sectors and located in the U.K., Germany, Canada, Norway, Russia, and Ukraine.

The threat actor uses an array of established hacking tools to infiltrate its targets and steal internal corporate documentation, such as staff records, court and legal files, and enterprise email history, with the collective spending anywhere from two to six months between initial infection to the time data gets actually stolen.

RedCurl mode of operation is different from others, because it doesn’t deploy backdoors nor rely on post-exploitation tools. Despite of maintaining entrenched access, the group hasn’t been observed conducting attacks that are motivated by financial gain and involve encrypting victim infrastructure, or demanding ransoms for stolen data.

The emphasis appears to be to obtain valuable information as covertly as possible using a combination of self-developed and publicly available programs to gain initial access using social engineering means, perform reconnaissance, achieve persistence, move laterally, and exfiltrate sensitive documentation.

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Espionage in cyberspace is a hallmark of state-sponsored advanced persistent threats,in most cases, such attacks target other states or state-owned companies. Corporate cyber espionage is still a relatively rare and, in many ways, unique occurrence, its possible that the group’s success could lead to a new trend in cybercrime.