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US Gov Warning: Begin Attempting to find Iranian APTs That Exploited Log4j

By Ryan Naraine on November 16, 2022

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The U.S. authorities on Wednesday issued a blunt advice for organizations operating VMWare Horizon servers: Provoke threat-hunting actions to search out and expel Iranian APT actors that used the Log4j disaster to slide undetected into company networks.

In line with a joint advisory from CISA and the FBI, Iranian government-sponsored hackers hit not less than one Federal Civilian Government Department (FCEB) group with an exploit for a Log4j vulnerability in an unpatched VMware Horizon server. 

From the advisory [PDF]:

“From mid-June by means of mid-July 2022, CISA carried out an incident response engagement at a Federal Civilian Government Department (FCEB) group the place CISA noticed suspected superior persistent risk (APT) exercise.

In the middle of incident response actions, CISA decided that cyber risk actors exploited the Log4Shell vulnerability in an unpatched VMware Horizon server, put in XMRig crypto mining software program, moved laterally to the area controller (DC), compromised credentials, after which implanted Ngrok reverse proxies on a number of hosts to keep up persistence.

CISA and the Federal Bureau of Investigation (FBI) assess that the FCEB community was compromised by Iranian government-sponsored APT actors.”

The companies printed indicators of compromise (IOCs) and different knowledge to assist organizations hunt for indicators of an infection with an “assume compromise” mindset.

[READ: Attackers Hitting VMWare Horizon Servers With Log4j Exploits ]

“All organizations with affected VMware techniques that didn’t instantly apply out there patches or workarounds [should] assume compromise and provoke risk searching actions,” the companies stated.

If a company finds indicators of compromise based mostly on the printed IOCs, defenders ought to instantly assume lateral motion by risk actors and examine linked techniques (together with the Area Controller), and audit privileged accounts.

The CISA/FBI alert urged all organizations, no matter recognized proof of compromise, ought to apply pressing mitigations round patching, minimization internet-facing assault floor, implementing finest practices for identification administration and entry, and securing credentials by proscribing the place accounts and credentials can be utilized.

Earlier this yr, safety researchers at SentinelLabs documented malware assaults compromising VMWare Horizon servers through Log4j exploits.  The corporate attributed these assaults to an Iranian-aligned risk actor working within the Center East and the U.S. 

VMWare shipped high-priority patches for quite a few merchandise affected by Log4j and publicly acknowledged scanning makes an attempt to determine indicators of weak installations.

On the focused VMware Horizon platform, which is utilized by enterprises to run digital desktops and apps throughout the hybrid cloud, the Log4j vulnerability carries a 10-out-of-10 vital score.

Associated: Attackers Hitting VMWare Horizon Servers With Log4j Exploits

Associated: VMware Warns of Log4j Assaults Concentrating on Horizon Servers

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