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New advanced malware, possibly nation sponsored, is targeting US utilities


New advanced malware, possibly nation sponsored, is targeting US utilities

A new piece of advanced espionage malware, possibly developed by nation-supported attacker, targeted three US companies in the utilities industry last month, researchers from security firm Proofpoint reported on Thursday.

Employees of the three unnamed companies, a Proofpoint reported, received emails purporting to come from the National Council of Examiners for Engineering and Surveying. This non-profit group develops, administers, and scores examinations used in granting licenses for US engineers. Using the official NCEES logo and the domain nceess[.]com, the emails said that the recipients failed to achieve a passing score on a recent exam. The attached Word document was titled Result Notice.doc.

New advanced malware, possibly nation sponsored, is targeting US utilities 1


Malicious macros embedded into the document attempted to install a package of full-featured malware Proofpoint calling LookBack. Components included a remote-access trojan written in C++ and a proxy tool for communicating with a command and control server. Once LookBack is installed, it gives attackers a full range of capabilities that include:

  • Get process listing
  • Kill process
  • Execute cmd[.] exe commands
  • Get drive type
  • Find files
  • Read files
  • Delete files
  • Write to files
  • Execute files
  • Enumerate services
  • Start services
  • Delete services
  • Take a screenshot of the desktop
  • Move/Click Mouse and take a screenshot
  • Exit
  • Remove self
  • Shutdown
  • Reboot

Beyond its wide-ranging capabilities, LookBack was advanced for other reasons. The command server proxy could impersonate WinGup, an open source updater that’s used by Notepad++ in an attempt to camouflage itself. Another way WinGup avoided detection: a dynamic link library appeared to be a legitimate DLL file for the software tool libcurl except for a single exported function. The attackers used the function to extract encrypted data in the DLL to carry out communications and establish persistence on the infected computer.

Sherrod DeGrippo, Proofpoint’s senior director of threat research and detection, said his company was able to block all phishing attempts used against the three customers in this campaign. The researcher said it’s not clear if there were other targets or any of them were infected.

Proofpoint said that the macros found in the Word document are similar to ones used in targeted attacks against Japanese businesses last year. Specifically: the macros (written in the Visual Basic for Applications language) used a large number of concatenation commands, possibly in an attempt to evade detection of the malicious macros. The macro pictured immediately below is from 2018. The one below that was used in the attacks from last month.

New advanced malware, possibly nation sponsored, is targeting US utilities 2


New advanced malware, possibly nation sponsored, is targeting US utilities 3

According to security firm FireEye, an advanced persistent threat group operating out of China carried out the 2018 attacks against Japanese businesses. The threat was called APT10 or Menupass.

“The macros used in the incident described by Proofpoint are highly similar to the macros used by APT10 in 2018,” FireEye Principal Analyst Sarah Jones said in an emailed statement. “We also concur that the malware is, in fact, different than what was used previously in 2018. At this time, we cannot definitively attribute this to APT10 or any other named group.”

While it’s still not clear precisely who is behind the recent campaign, there’s little doubt it poses a significant threat given its target.

“The detection of a new malware family delivered using phishing tactics once used by known APT adversaries highlights a continuing global risk from nation-state actors,” Proofpoint researchers Michael Raggi and Dennis Schwarz wrote. “While definitive attribution in this instance requires further study of infrastructure, toolsets, and methodologies, the risk that these campaigns pose to utilities providers is clear. The profile of this campaign is indicative of specific risk to US-based entities in the utilities sector.”

The report includes indicators of compromise that other utilities can use to help determine if they have been targeted or infected.

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