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* New Cerber ransomware targets Confluence and GitLab servers
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NEW CERBER RANSOMWARE TARGETS CONFLUENCE AND GITLAB SERVERS
By
LAWRENCE ABRAMS
* December 7, 2021
* 01:19 PM
* 0
Cerber ransomware is back, as a new ransomware family adopts the old name and
targets Atlassian Confluence and GitLab servers using remote code execution
vulnerabilities.
As ransomware began picking up pace in 2016, a new Cerber ransomware operation
emerged that quickly became one of the most prolific gangs at the time. However,
its activity slowly tapered off until it disappeared at the end of 2019.
Starting last month, a ransomware called Cerber (named CerberImposter on ID
Ransomware) once again reared its ugly head, as it began infecting victims
worldwide with both a Windows and Linux encryptor.
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The new version of Cerber is creating ransom notes named
__$$RECOVERY_README$$__.html and appending the .locked extension to encrypted
files.
From the victims seen by BleepingComputer, the new Cerber ransomware gang is
demanding ransoms ranging from $1,000 to $3,000.
Cerber Tor payment site
Source: BleepingComputer
Emsisoft CTO and ransomware expert Fabian Wosar examined the new variant and
said it does not match the code of the older family. In particular, the new
version uses the Crypto+++ library, while the older variant used Windows
CryptoAPI libraries.
These code differences and the fact that the original Cerber did not have a
Linux variant lead us to believe that a new threat actor has adopted the name,
ransom note, and Tor payment site, and is not the original operation.
TARGETING CONFLUENCE AND GITLAB SERVERS
This week, security researchers and vendors have seen the new Cerber ransomware
operation hacking servers using remote code execution vulnerabilities in
Atlassian Confluence and GitLab.
Security researcher BoanBird shared a sample of the new Cerber ransomware with
BleepingComputer which shows this new strain specifically targets the Atlassian
Confluence folders listed below.
C:\Program Files\Atlassian\Application Data
C:\Program Files\Atlassian\Application Data\Confluence
C:\Program Files\Atlassian\Application Data\Confluence\backups
BoanBird also shared a link to the GitLab forums where admins disclosed that
Cerber exploits a recently disclosed vulnerability in GitLab's ExifTool
component.
Cerber targeting GitLab servers as well
These vulnerabilities are tracked as CVE-2021-26084 (Confluence)
and CVE-2021-22205 (GitLab) and can be exploited remotely without
authentication. Additionally, both vulnerabilities have publicly disclosed
proof-of-concept (PoC) exploits, allowing attackers to breach servers easily.
A report released this week by researchers at Tencent shows that attacks
deploying the new Cerber ransomware are mostly targeting the United States,
Germany, and China.
Although the previous version of Cerber excluded targets in the CIS
(Commonwealth of Independent States), Tencent's telemetry data from the recent
attacks shows otherwise. Furthermore, BleepingComputer has also independently
confirmed multiple victims in Russia, indicating that these threat actors are
indiscriminate in who they target.
Victims heatmap on the latest Cerber attacks
Source: Tencent
At this time, the best approach to protect against Cerber would be to apply the
available security updates for Atlassian Confluence and GitLab.
However, as more servers are patched, we should expect the threat actors to
target other vulnerabilities to breach servers.
RELATED ARTICLES:
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exploit-as-a-service
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BleepingComputer's most popular cybersecurity and tech stories of 2021
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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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