The advanced persistent threat (APT) known as Lazarus Group and other sophisticated nation-state actors are actively trying to steal COVID-19 research to speed up their countries’ vaccine-development efforts.
That’s the finding from Kaspersky researchers, who found that Lazarus Group — widely believed to be linked to North Korea — recently attacked a pharmaceutical company, as well as a government health ministry related to the COVID-19 response. The goal was intellectual-property theft, researchers said.
“On Oct. 27, 2020, two Windows servers were compromised at the ministry,” according to a blog posting issued Wednesday. Researchers added, “According to our telemetry, [the pharmaceutical] company was breached on Sept. 25, 2020….[it] is developing a COVID-19 vaccine and is authorized to produce and distribute COVID-19 vaccines.”
They added, “These two incidents reveal the Lazarus Group’s interest in intelligence related to COVID-19. While the group is mostly known for its financial activities, it is a good reminder that it can go after strategic research as well.”
In the first instance, the cyberattackers installed a sophisticated malware called “wAgent” on the ministry’s servers, which is fileless (it only works in memory) and it fetches additional payloads from a remote server. For the pharma company, Lazarus Group deployed the Bookcode malware in a likely supply-chain attack through a South Korean software company, according to Kaspersky.
“Both attacks leveraged different malware clusters that do not overlap much,” researchers said. “However, we can confirm that both of them are connected to the Lazarus group, and we also found overlaps in the post-exploitation process.”
It’s unknown what the initial infection vector was, but the wAgent malware cluster contained fake metadata in order to make it look like the legitimate compression utility XZ Utils. Kaspersky’s analysis showed that the malware was directly executed on the victim machine from a command line shell. A 16-byte string parameter is used as an AES key to decrypt an embedded payload – a Windows DLL – which is loaded in memory.
From there, it decrypts configuration information using a given decryption key, including command-and-control server (C2) addresses. Then it generates identifiers to distinguish each victim using the hash of a random value. POST parameter names are decrypted at runtime and chosen randomly at each C2 connection, researchers explained.
In the final step, wAgent fetches an in-memory Windows DLL containing backdoor functionalities, which the attackers used to gather and exfiltrate victim information through shell commands.
“We’ve previously seen and reported to our Threat Intelligence Report customers that a very similar technique was used when the Lazarus group attacked cryptocurrency businesses with an evolved downloader malware,” they said, adding that “[The malware’s] debugging messages have the same structure as previous malware used in attacks against cryptocurrency businesses involving the Lazarus group.”
As for the Bookcode malware cluster, here too the researchers weren’t able to uncover the initial access vector for certain, but it could be a supply-chain gambit, they said.
“We previously saw Lazarus attack a software company in South Korea with Bookcode malware, possibly targeting the source code or supply chain of that company,” according to Kaspersky. “We have also witnessed the Lazarus group carry out spearphishing or strategic website compromise in order to deliver Bookcode malware in the past.”
Upon execution, the Bookcode malware reads a configuration file and connects with its C2 – after which it provides standard backdoor functionalities, researchers said, and sends information about the victim to the attacker’s infrastructure, including password hashes.
“In the lateral movement phase, the malware operator used well-known methodologies,” they added. “After acquiring account information, they connected to another host with the ‘net’ command and executed a copied payload with the ‘wmic’ command. Moreover, Lazarus used ADfind in order to collect additional information from the Active Directory. Using this utility, the threat actor extracted a list of the victim’s users and computers.”
Kaspersky also discovered an additional configuration file containing four C2 servers, all of which are compromised web servers located in South Korea.
“We discovered several log files and a script from [one of the] compromised servers, which is a first-stage C2 server,” researchers noted. “It receives connections from the backdoor, but only serves as a proxy to a second-stage server where the operators actually store orders.”
Besides implant control features, the C2 script has additional capabilities such as updating the next-stage C2 server address, sending the identifier of the implant to the next-stage server or removing a log file.
“We assess with high confidence that the activity analyzed in this post is attributable to the Lazarus Group,” Kaspersky noted, explaining that both malware suites have been previously attributed to the APT, with Bookcode being exclusive to it. Additionally, the overlaps in the post-exploitation phase are notable.
These include “the usage of ADFind in the attack against the health ministry to collect further information on the victim’s environment,” researchers explained. “The same tool was deployed during the pharmaceutical company case in order to extract the list of employees and computers from the Active Directory. Although ADfind is a common tool for the post-exploitation process, it is an additional data point that indicates that the attackers use shared tools and methodologies.”
Going forward, attacks on COVID-19 vaccine and drug developers and attempts to steal sensitive data from them will continue, Kaspersky recently predicted. As the development race between pharmaceutical firms continues, these cyberattacks will have ramifications for geopolitics, with the “attribution of attacks entailing serious consequences or aimed at the latest medical developments is sure to be cited as an argument in diplomatic disputes.”
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