1 malware family

UNC2682

Also known asUNC2682

UNC2682 is a threat activity cluster tracked for exploitation of SonicWall Email Security vulnerabilities, including CVE-2021-20021, CVE-2021-20022, and CVE-2021-20023. The actor used BEHINDER web shells to backdoor compromised systems and operated post-compromise with high privileges on affected servers. Observed tradecraft included clearing application logs to reduce visibility, using living-off-the-land techniques for credential access, exporting Windows registry hives to obtain password hashes and LSA secrets, and dumping process memory from LSASS and Apache Tomcat via built-in Windows functionality. The actor also staged email archive data for collection and accessed victim emails and files. UNC2682 demonstrated lateral movement and remote execution within victim environments, including use of WMI-based execution through Impacket tooling after leveraging local administrator password reuse across hosts. The intrusion also involved brief internal reconnaissance and broader post-exploitation activity. The actor’s ultimate objective was not determined with high confidence, but observed behavior shows a capable intrusion set focused on backdooring internet-facing email security infrastructure, credential theft, data access, and movement through victim networks. No high-confidence attribution to a specific country or state sponsor is currently available.

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MITRE ATT&CK

Tradecraft

7 distinct techniques observed across reporting, grouped by tactic. Hover any cell for the evidence excerpt; click through for MITRE's full description.

6 of 15 tactics11 techniques×N= number of intelligence reports citing this technique

MITRE ATT&CK

TA0001

Initial Access

1 technique

T1190

Exploit Public-Facing Application

TA0003

Persistence

1 technique

T1505

Server Software Component

T1505.003×2

Web Shell

TA0005

Stealth

1 technique

T1070

Indicator Removal

T1070.001

Clear Windows Event Logs

TA0006

Credential Access

1 technique

T1003

OS Credential Dumping

T1003.001

LSASS Memory

T1003.002

Security Account Manager

TA0008

Lateral Movement

1 technique

T1021

Remote Services

T1021.003

Distributed Component Object Model

TA0009

Collection

1 technique

T1560

Archive Collected Data

ARSENAL

Associated malware families

1 malware family attributed to this actor across reporting.

FamilyContextEvidenceLast seen

BEHINDERThese three zero-days were also actively exploited by a group Mandiant tracks as UNC2682 to backdoor systems using BEHINDER web shells, allowing them to move laterally through victims' networks and access emails and files.2Aug 14, 2026

ACTIVITY FEED

Recent activity

2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

2 SOURCESView more in app

bleeping computerNews

Jul 17, 2021

HelloKitty ransomware is targeting vulnerable SonicWall devices

Threat group that exploited SonicWall Email Security zero-days to install backdoors, move laterally, and access victim emails and files.

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Target overlap

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Tradecraft mapping7

Every observed MITRE ATT&CK technique, grouped by tactic.

Malware arsenal1

Families this actor is known to deploy, with IOCs and behavior.

Exploited CVEs

CVEs this actor has used in known campaigns.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Observables

Domains, IPs, and hashes tied to this actor, refreshed continuously.

UNC2682

Also known asUNC2682