The researchers have long been tracking the advanced persistent threat (APT) group and suspect that it operates out of China, according to today’s press release.
Named Okrum by ESET, the malware was first detected in late 2016 when it was used to target diplomatic missions and governmental institutions in Belgium, Slovakia, Brazil, Chile and Guatemala. However, researchers have seen multiple variations of the malware families and attributed the activity to the Ke3chang group.
“In research going back to 2015, ESET identified new suspicious activities in European countries. The group behind the attacks seemed to have particular interest in Slovakia, but Croatia, the Czech Republic and other countries were also affected. Analyzing the malware used in these attacks, ESET researchers found that it was linked to known malware families attributed to the Ke3chang group, and dubbed these new versions Ketrican,” the release stated.
“We started connecting the dots when we discovered that the Okrum backdoor was used to drop a Ketrican backdoor, compiled in 2017. On top of that, we found that some diplomatic entities that were affected by the Okrum malware and the 2015 Ketrican backdoors were also affected by 2017 Ketrican backdoors,” said Zuzana Hromcova, the ESET researcher who made the discoveries.
The group has remained active in 2019. As recently as March, researchers “detected a new Ketrican sample that has evolved from the 2018 Ketrican backdoor. It affected the same targets as the backdoor from 2018,” according to the research.
“Okrum can impersonate a logged on user’s security context using a call to the ImpersonateLoggedOnUser API in order to gain administrator privileges.” It then automatically collects information about the infected computer, including computer name, user name, host IP address, primary DNS suffix value, OS version, build number, architecture, user agent string and locale info (language name, country name), the report added.
Source: Infosecurity Magazine