Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

ABTV //

Malware

10/22/2019
11:05 AM
Larry Loeb
Larry Loeb
Larry Loeb
50%
50%

Two Threat Actors, One Targeted Threat

By combining, two threat actors leveraged their own specific areas of expertise into one highly efficient and private tool.

When the GrandCrab ransomware operators quit the arena, they left an vacuum that others have tried to fill.

Since April 2019, Sodinokibi (a.k.a. REvil) has been a major player. The operation has gained the respect of fellow cybercriminals as well as security researchers.

The ransomware, for example, has been deployed on Oracle WebLogic servers through the use of a critical deserialization vulnerability. \r\nThere is an interesting similarity between the GrandCrab ransomware and REvil's malware in one area. Both will not do business in Russia, Ukraine, Moldova, Belarus, Kyrgyzstan, Kazakhstan, Armenia, Tajikistan, Turkmenistan or Uzbekistan.

REvil had the malware, but not the reach to deliver it as widely as they would have wished.

AdvIntel, a NYC-based security firm with some seemingly deep contacts in Russia, says it noticed a threat actor with a moniker of -TMT- joining a top-level Russian hack forum in May of this year.

He then started talking about his "warez." AdvIntel further observed that during, "June, July, and August, they were looking for customers to monetize corporate network compromises, however, not specifying the victim names, instead referring to the breaches as 'fat accesses'. At the same time, in private communication, -TMT- offered several accesses to compromised entities, as well as stolen credentials for administrative accounts on the victim's websites. Their breach prices ranged from $3,000 to $5,000 USD."

They said they had the access. They said they had a way to do this that seemed reasonable. Their Tactics, Techniques & Procedures (TTPs) were focused on doing breaches of corporate networks. For these purposes, they were using compromised remote desktop protocols and credential-stealing malware as the initial attack vectors.

The actor even said, according to AdvIntel, that Cobalt Strike Beacon was used to access secure environments. Beacon is Cobalt Strike's payload used for as initial payload. Beacon's shell command allows executing command prompt commands on the compromised host.

REvil noticed. Since August 2019, AdvIntel says, -TMT- had been partnering with REvil developers to support the -TMT- crypto locker uploads. Both parties joined in an effort to customize ransomware admin panels so that they didn't need to be rented from a third-party as a service. It was also expressed by the hacker forum participants that an approach with less third-party participation added to the security of a overall ransomware operation.

They also think that the joining of -TMT- and REvil was the main reason why the two actors almost simultaneously left the Exploit forum, no doubt to communicate by other means with each other. AdvIntel also said in the blog that, "The data breach community has been constantly sharing their concerns regarding the inefficiency of direct breach monetization via underground forums. Indeed, many high-profile breaches were compromised by unexperienced buyers or law enforcement during the initial examination of the admin panel access."

So, it seems that publicly hanging out your accesses for sale in an access-as-a-service scheme wasn't a great business model. But by combining, the two threat actors leveraged their own specific areas of expertise into one highly efficient -- and private -- tool.

— Larry Loeb has written for many of the last century's major "dead tree" computer magazines, having been, among other things, a consulting editor for BYTE magazine and senior editor for the launch of WebWeek.

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
COVID-19: Latest Security News & Commentary
Dark Reading Staff 9/17/2020
Cybersecurity Bounces Back, but Talent Still Absent
Simone Petrella, Chief Executive Officer, CyberVista,  9/16/2020
Meet the Computer Scientist Who Helped Push for Paper Ballots
Kelly Jackson Higgins, Executive Editor at Dark Reading,  9/16/2020
Register for Dark Reading Newsletters
White Papers
Video
Cartoon
Current Issue
Special Report: Computing's New Normal
This special report examines how IT security organizations have adapted to the "new normal" of computing and what the long-term effects will be. Read it and get a unique set of perspectives on issues ranging from new threats & vulnerabilities as a result of remote working to how enterprise security strategy will be affected long term.
Flash Poll
How IT Security Organizations are Attacking the Cybersecurity Problem
How IT Security Organizations are Attacking the Cybersecurity Problem
The COVID-19 pandemic turned the world -- and enterprise computing -- on end. Here's a look at how cybersecurity teams are retrenching their defense strategies, rebuilding their teams, and selecting new technologies to stop the oncoming rise of online attacks.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2020-5421
PUBLISHED: 2020-09-19
In Spring Framework versions 5.2.0 - 5.2.8, 5.1.0 - 5.1.17, 5.0.0 - 5.0.18, 4.3.0 - 4.3.28, and older unsupported versions, the protections against RFD attacks from CVE-2015-5211 may be bypassed depending on the browser used through the use of a jsessionid path parameter.
CVE-2020-8225
PUBLISHED: 2020-09-18
A cleartext storage of sensitive information in Nextcloud Desktop Client 2.6.4 gave away information about used proxies and their authentication credentials.
CVE-2020-8237
PUBLISHED: 2020-09-18
Prototype pollution in json-bigint npm package < 1.0.0 may lead to a denial-of-service (DoS) attack.
CVE-2020-8245
PUBLISHED: 2020-09-18
Improper Input Validation on Citrix ADC and Citrix Gateway 13.0 before 13.0-64.35, Citrix ADC and NetScaler Gateway 12.1 before 12.1-58.15, Citrix ADC 12.1-FIPS before 12.1-55.187, Citrix ADC and NetScaler Gateway 12.0, Citrix ADC and NetScaler Gateway 11.1 before 11.1-65.12, Citrix SD-WAN WANOP 11....
CVE-2020-8246
PUBLISHED: 2020-09-18
Citrix ADC and Citrix Gateway 13.0 before 13.0-64.35, Citrix ADC and NetScaler Gateway 12.1 before 12.1-58.15, Citrix ADC 12.1-FIPS before 12.1-55.187, Citrix ADC and NetScaler Gateway 12.0, Citrix ADC and NetScaler Gateway 11.1 before 11.1-65.12, Citrix SD-WAN WANOP 11.2 before 11.2.1a, Citrix SD-W...