From at least January to April 2020, suspected Vietnamese actors APT32 carried out intrusion campaigns against Chinese targets that Mandiant Threat Intelligence believes was designed to collect intelligence on the Covid-19 crisis. Spearphishing messages were sent by the actor to China’s Ministry of Emergency Management as well as the government of Wuhan province, where Covid-19 was first identified. While targeting of East Asia is consistent with previous activity, this incident, and other publicly reported intrusions, are part of a global increase in cyber espionage related to the crisis, carried out by states desperately seeking solutions and nonpublic information.
Phishing emails with tracking links target Chinese government
The first known instance of this campaign was on Jan. 6, 2020, when APT32 sent an email with an embedded tracking link to China’s Ministry of Emergency Management using the sender address lijianxiang1870@163.com and the subject 第一期办公设备招标结果报告. Translation: Report on the first quarter results of office equipment bids. The embedded link contained the victim’s email address and code to report back to the actors if the email was opened.
Mandiant Threat Intelligence uncovered additional tracking URLs that revealed targets in China’s Wuhan government and an email account also associated with the Ministry of Emergency Management.
- libjs.inquirerjs.com/script/<VICTIM>@wuhan.gov.cn.png
- libjs.inquirerjs.com/script/<VICTIM>@chinasafety.gov.cn.png
- m.topiccore.com/script/<VICTIM>@chinasafety.gov.cn.png
- m.topiccore.com/script/<VICTIM>@wuhan.gov.cn.png
- libjs.inquirerjs.com/script/<VICTIM>@126.com.png
The libjss.inquirerjs.com domain was used in December as a C&C domain for a METALJACK phishing campaign likely targeting Southeast Asian countries.
Targeting of Mandarin speakers interested in Covid-19
APT32 likely used Covid-19-themed malicious attachments against Chinese speaking targets. While we have not uncovered the full execution chain, we uncovered a METALJACK loader displaying a Chinese-Language titled Covid-19 decoy document while launching its payload.
When the METALJACK loader, krpt.dll (MD5: d739f10933c11bd6bd9677f91893986c) is loaded, the export “_force_link_krpt” is likely called. The loader executes one of its embedded resources, a COVID-themed RTF file, displaying the content to the victim and saving the document to %TEMP%.
The decoy document (Figure 2) titled 冠状病毒实时更新：中国正在追踪来自湖北的旅行者, MD5: c5b98b77810c5619d20b71791b820529. Translation: Covid-19 live updates: China is currently tracking all travellers coming from Hubei Province, displays a copy of a New York Times article to the victim.
The malware also loads shellcode in an additional resource, MD5: a4808a329b071a1a37b8d03b1305b0cb, which contains the METALJACK payload. The shellcode performs a system survey to collect the victim’s computer name and username and then appends those values to a URL string using libjs.inquirerjs.com. It then attempts to call out to the URL. If the callout is successful, the malware loads the METALJACK payload into memory.
It then uses vitlescaux.com for command and control.
Outlook
The Covid-19 crisis poses an intense, existential concern to governments, and the current air of distrust is amplifying uncertainties, encouraging intelligence collection on a scale that rivals armed conflict. National, state or provincial, and local governments, non-government organisations, and international organisations, are being targeted. Medical research has been targeted as well, according to public statements by a Deputy Assistant Director of the FBI. Until this crisis ends, we anticipate related cyber espionage will continue to intensify globally.
