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Our Threat Research team maintains a vigilant watch over the cyber threat landscape, hunting for malware as a normal course of operations.…
UNC2891 often made use of the STEELCORGI in-memory dropper which decrypts its embedded payloads by deriving a ChaCha20 key from the value of an environment variable obtained at runtime. In many cases, Mandiant was unable to recover the requisite environment variables to decrypt the embedded payloads.…
Pandora ransomware came into the spotlight in March 2022 after targeting some high-profile victims on its leak site. The ransomware group announced its first victim on 21 Feb 2022 and has posted around five victims to date.
Figure 1: Pandora ransomware data leak siteDuring a routine threat hunting exercise, Cyble Research Labs came across the sample for this ransomware.…
Over recent months, the CrowdStrike Falcon® OverWatch™ team has tracked an ongoing, widespread intrusion campaign leveraging bundled .msi installers to trick victims into downloading malicious payloads alongside legitimate software. These payloads and scripts were used to perform reconnaissance and ultimately download and execute NIGHT SPIDER’s Zloader trojan, as detailed in CrowdStrike CROWDSTRIKE FALCON® INTELLIGENCE™ Premium reporting.…
By Edmund Brumaghin, with contributions from Jonathan Byrne, Perceo Lemos and Vasileios Koutsoumpogeras.
This post is also available in:日本語 (Japanese)
Українська (Ukrainian)
Executive SummarySince the beginning of the war in Ukraine, we have observed threat actors using email lures with themes related to the conflict, including humanitarian assistance and various types of fundraising.…In July of 2021, we identified an infection campaign targeting important European entities. During this investigation we could identify the threat actor behind these attacks as LazyScripter, an emerging APT group pointed by MalwareBytes in February 2021.
Through our analysis, we could track their activity with precise dates in 2021 based on their samples.…
For additional information regarding deserialization exploits and our new hunting rule generation tool ‘HeySerial’, read our blog post, Now You Serial, Now You Don’t — Systematically Hunting for Deserialization Exploits.
USAHerds (CVE-2021-44207) Zero-DayIn three investigations from 2021, APT41 exploited a zero-day vulnerability in the USAHerds web application.…
One of our readers shared an interesting sample received via email. Like him, if you get access to interesting/suspicious data, please share it with us (if you’re authorized of course). We are always looking for fresh meat!
The file was received as an attachment to a mail that pretended to be related to a purchase order.…
Lorenz is a ransomware strain observed first in February of 2021, and is believed to be a rebranding of the “.sZ40” ransomware that was discovered in October 2020. Lorenz targets organizations worldwide with customized attacks demanding hundreds of thousands of dollars, and even millions in ransom fee. …
Recently, we’ve been researching several threat actors operating in South Asia: Transparent Tribe, SideCopy, etc., that deploy a range of remote access trojans (RATs). After a hunting session in our malware sample repositories and VirusTotal while looking into these actors, we gathered a small collection of VBA code samples that eventually allowed us to connect certain IOCs to individual threat actors based on the final payload, victimology and submission locations.…
In August 2021, a disgruntled CONTI affiliate leaked training documents, playbooks, and tools used to assist in CONTI ransomware operations. Mandiant has determined that some of the activity listed above overlaps with techniques in the playbooks disclosed in August.
At this time, due to the public release of this information, other unaffiliated actors may be replicating the techniques for their own motives and objectives.…
The Belarusian Cyber Partisans have shared documents related to another hack, and explained that Curated Intel member, SttyK, would “understand some of the methods used.”
Written by @BushidoToken and edited by @SteveD3
On Monday 24 January 2022, a Belarusian hacktivist group going by the name Belarusian Cyber-Partisans claimed responsibility for a limited attack against the national railway company.…The BlackBerry Research & Intelligence and Incident Response (IR) teams have found evidence correlating attacks by the Initial Access Broker (IAB) group Prophet Spider with exploitation of the Log4j vulnerability in VMware Horizon. This article highlights the recent indicators of compromise (IoCs) that we’ve observed.
Defenders concerned that they may have been a victim of these attacks can make use of these IoCs and detection methods to identify evidence of compromise within their environment.…
Over the past year, we have seen ransomware attackers change the way they have responded to organizations that have either chosen to not pay the ransom or have recovered their data via some other means. At the end of the day, fighting ransomware has resulted in the bad actors’ loss of revenue.…
In a recent report the McAfee Advanced Threat Research (ATR) Strategic Intelligence team disclosed an espionage campaign, targeting telecommunication companies, named Operation Diànxùn.
The tactics, techniques and procedures (TTPs) used in the attack are like those observed in earlier campaigns publicly attributed to the threat actors RedDelta and Mustang Panda.…