CoolClient is a backdoor family attributed to the HoneyMyte APT group (also known as Mustang Panda) that has been used in their cyber-espionage campaigns targeting organizations across Asia and Russia. It supports such capabilities as keylogging, clipboard theft, credential harvesting, file management, system reconnaissance, and plugin-based extensions.
Since its first public disclosure by Sophos in 2022 and subsequent analysis by Trend Micro in 2023, CoolClient has continued to evolve. In 2025, we analyzed a newer variant that introduced clipboard theft and HTTP traffic interception for credential harvesting.
Read more…
Source: Kaspersky
Sign up for the Cyber Security Review Newsletter
The latest cyber security news and insights delivered right to your inbox
Related:
- From RM3 to LDR4: URSNIF Leaves Banking Fraud Behind
October 20, 2022
A new variant of the URSNIF malware, first observed in June 2022, marks an important milestone for the tool. Unlike previous iterations of URSNIF, this new variant, dubbed LDR4, is not a banker, but a generic backdoor (similar to the short-lived SAIGON variant), which may have been purposely built to enable operations like ransomware and ...
- CISA Updates Advisory on Threat Actors Exploiting Multiple CVEs Against Zimbra Collaboration Suite
October 19, 2022
CISA and the Multi-State Information Sharing & Analysis Center (MS-ISAC) have updated joint Cybersecurity Advisory AA22-228A: Threat Actors Exploiting Multiple CVEs Against Zimbra Collaboration Suite, originally released August 16, 2022. The advisory has been updated to reference the addition of a new Malware Analysis Report, MAR-10398871.r1.v2. CISA encourages organizations to review the latest update to AA22-228A ...
- ‘Fully undetectable’ Windows backdoor gets detected
October 18, 2022
SafeBreach Labs says it has detected a novel fully undetectable (FUD) PowerShell backdoor, which calls into question the accuracy of threat naming. More significantly, the malware may backdoor your Windows system by masquerading as part of the update process. Tomer Bar, director of security research at SafeBreach, explains in an advisory that the software nasty and associated ...
- Spyder Loader: Malware Seen in Recent Campaign Targeting Organizations in Hong Kong
October 18, 2022
Symantec has observed a likely continuation of the Operation CuckooBees activity, this time targeting organizations in Hong Kong. Operation CuckooBees was first documented in May 2022 by researchers at Cybereason, who said the intelligence-gathering campaign had been operating under the radar since at least 2019, stealing intellectual property and other sensitive data from victims. The victims observed ...
- CISA Releases Two Industrial Control Systems Advisories
October 18, 2022
CISA released two Industrial Control Systems (ICS) advisories on October 18, 2022. These advisories provide timely information about current security issues, vulnerabilities, and exploits surrounding ICS. CISA encourages users and administrators to review the newly released ICS advisories for technical details and mitigations: ICSA-22-291-01 Advantech R-SeeNet ICSA-21-336-06 Hitachi Energy APM Edge (Update A) Read more… Source: U.S. Cybersecurity and Infrastructure ...
- Verizon notifies prepaid customers their accounts were breached
October 18, 2022
Verizon warned an undisclosed number of prepaid customers that attackers gained access to Verizon accounts and used exposed credit card info in SIM swapping attacks. “We determined that between October 6 and October 10, 2022, a third party actor accessed the last four digits of the credit card used to make automatic payments on your account,” ...