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REVIL RANSOMWARE RETURNS: NEW MALWARE SAMPLE CONFIRMS GANG IS BACK
By
LAWRENCE ABRAMS
* May 1, 2022
* 02:06 PM
* 0
The notorious REvil ransomware operation has returned amidst rising tensions
between Russia and the USA, with new infrastructure and a modified encryptor
allowing for more targeted attacks.
In October, the REvil ransomware gang shut down after a law enforcement
operation hijacked their Tor servers, followed by arrests of members by Russian
law enforcement.
However, after the invasion of Ukraine, Russia stated that the US had withdrawn
from the negotiation process regarding the REvil gang and closed communications
channels.
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REVIL'S TOR SITES COME BACK TO LIFE
Soon after, the old REvil Tor infrastructure began operating again, but instead
of showing the old websites, they redirected visitors to URLs for a new unnamed
ransomware operation.
While these sites looked nothing like REvil's previous websites, the fact that
the old infrastructure was redirecting to the new sites indicated that REvil was
likely operating again. Furthermore, these new sites contained a mix of new
victims and data stolen during previous REvil attacks.
While these events strongly indicated that REvil rebranded as the new unnamed
operation, the Tor sites had also previously displayed a message in November
stating that "REvil is bad."
This access to the Tor sites meant that other threat actors or law enforcement
had access to REvil's TOR sites, so the websites themselves were not strong
enough proof of the gang's return.
REvil's tor sites are defaced with an anti-REvil message
Source: BleepingComputer
The only way to know for sure whether REvil was back was to find a sample of the
ransomware encryptor and analyze it to determine if it was patched or compiled
from source code.
A sample of the new ransomware operation's encryptor was finally discovered this
week by AVAST research Jakub Kroustek and has confirmed the new operation's ties
to REvil.
RANSOMWARE SAMPLE CONFIRMS RETURN
While a few ransomware operations are using REvil's encryptor, they all use
patched executables rather than having direct access to the gang's source code.
However, BleepingComputer has been told by multiple security researchers and
malware analysts that the discovered REvil sample used by the new operation is
compiled from source code and includes new changes.
Security researcher R3MRUM has tweeted that the REvil sample has had its version
number changed to 1.0 but is a continuation of the last version, 2.08, released
by REvil before they shut down.
Version change in new REvil encryptor
In discussion with BleepingComputer, the researcher said he could not explain
why the encryptor doesn't encrypt files but believes it was compiled from source
code.
"Yes, my assessment is that the threat actor has the source code. Not patched
like "LV Ransomware" did," R3MRUM told BleepingComputer.
Advanced Intel CEO Vitali Kremez also reverse-engineered the REvil sample this
weekend and has confirmed to BleepingComputer that it was compiled from source
code on April 26th and was not patched.
Kremez told BleepingComputer that the new REvil sample includes a new
configuration field, 'accs,' which contains credentials for the specific victim
that the attack is targeting.
Kremez believes that the 'accs' configuration option is used to prevent
encryption on other devices that do not contain the specified accounts and
Windows domains, allowing for highly targeted attacks.
In addition to the 'accs' option, the new REvil sample's configuration has
modified SUB and PID options, used as campaign and affiliate identifiers, to use
longer GUID-type values, such as '3c852cc8-b7f1-436e-ba3b-c53b7fc6c0e4.'
BleepingComputer also tested the ransomware sample, and while it did not
encrypt, it did create the ransom note, which is identical to REvil's old ransom
notes.
REvil ransom note
Furthermore, while there are some differences between the old REvil sites and
the rebranded operation, once a victim logs into the site, it is almost
identical to the originals, and the threat actors claim to be 'Sodinokibi,' as
shown below.
New ransomware operation claiming to be Sodinokibi
Source: BleepingComputer
While the original public-facing REvil representative known as 'Unknown' is
still missing, threat intelligence researcher FellowSecurity told
BleepingComputer that one of REvil's original core developers, who was part of
the old team, relaunched the ransomware operation.
As this was a core developer, it would make sense that they also had access to
the complete REvil source code and potentially the Tor private keys for the old
sites.
It's not surprising that REvil has rebranded under the new operation, especially
with the declining relations between USA and Russia.
However, when ransomware operations rebrand, they typically do it to evade law
enforcement or sanctions preventing the payment of ransoms.
Therefore, it is unusual for REvil to be so public about their return, rather
than trying to evade detection like we have seen in so many other ransomware
rebrands.
RELATED ARTICLES:
REvil ransomware member extradited to U.S. to stand trial for Kaseya attack
REvil's TOR sites come alive to redirect to new ransomware operation
FBI: BlackCat ransomware breached at least 60 entities worldwide
FBI warns of ransomware attacks targeting US agriculture sector
US and allies warn of Russian hacking threat to critical infrastructure
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LAWRENCE ABRAMS
Lawrence Abrams is the owner and Editor in Chief of BleepingComputer.com.
Lawrence's area of expertise includes Windows, malware removal, and computer
forensics. Lawrence Abrams is a co-author of the Winternals Defragmentation,
Recovery, and Administration Field Guide and the technical editor for Rootkits
for Dummies.
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