Cobalt Strike and a Pair of SOCKS Lead to LockBit Ransomware
Key Takeaways This intrusion began with the download and execution of a Cobalt Strike beacon that impersonated a Windows Media Configuration Utility. The threat actor used Rclone to exfiltrate data…
Nitrogen Campaign Drops Sliver and Ends With BlackCat Ransomware
In November 2023, we identified a BlackCat ransomware intrusion started by Nitrogen malware hosted on a website impersonating Advanced IP Scanner. Nitrogen was leveraged to deploy Sliver and Cobalt Strike beacons on the beachhead host and perform further malicious actions. The two post-exploitation frameworks were loaded in memory through Python scripts. After obtaining initial access and establishing further command and control connections, the threat actor enumerated the compromised network with the use of PowerSploit, SharpHound, and native Windows utilities. Impacket was employed to move laterally, after harvesting domain credentials. The threat actor deployed an opensource backup tool call Restic on a file server to exfiltrate share data to a remote server. Eight days after initial access the threat actor modified a privileged user password and deployed BlackCat ransomware across the domain using PsExec to execute a batch script. Six rules were added to our Private Ruleset related to this intrusion.
In December 2023, we observed an intrusion that started with the execution of a Cobalt Strike beacon and ended in the deployment of BlackSuit ransomware. The threat actor leveraged various tools, including Sharphound, Rubeus, SystemBC, Get-DataInfo.ps1, Cobalt Strike, and ADFind, along with built-in system tools. Command and control traffic was proxied through CloudFlare to conceal their Cobalt Strike server. Fifteen days after initial access, BlackSuit ransomware was deployed by copying files over SMB to admin shares and executing them through RDP sessions. Three rules were added to our private ruleset related to this case.
IcedID Brings ScreenConnect and CSharp Streamer to ALPHV Ransomware Deployment – The DFIR Report
Key Takeaways In October 2023, we observed an intrusion that began with a spam campaign, distributing a forked IcedID loader. The threat actor used Impacket’s wmiexec and RDP to install Scree…
From OneNote to RansomNote: An Ice Cold Intrusion - The DFIR Report
In late February 2023, threat actors rode a wave of initial access using Microsoft OneNote files. In this case, we observed a threat actor deliver IcedID using this method. After loading IcedID and establishing persistence, there was no further actions, other than beaconing for over 30 days. The threat actor used Cobalt Strike and AnyDesk to target a file server and a backup server. * The threat actor used FileZilla to exfiltrate data from the network before deploying Nokoyawa ransomware.
In 2022, The DFIR Report observed an increase in the adversarial usage of Remote Management and Monitoring (RMM) tools. When compared to post-exploitation channels that heavily rely on terminals, such … Read More
In this intrusion from May 2022, the threat actors used BumbleBee as the initial access vector. BumbleBee has been identified as an initial access vector utilized by several ransomware affiliates. …
In this intrusion from May 2022, the threat actors used BumbleBee as the initial access vector. BumbleBee has been identified as an initial access vector utilized by several ransomware affiliates. …
