7-Zip
7-Zip is a legitimate archive utility that threat actors have used during post-compromise collection and exfiltration. In the provided reporting, it was observed in UNC2447 intrusions as part of recon and exfiltration activity, and in a China-linked UAT-8837 campaign exploiting Sitecore CVE-2025-53690, where attackers compressed sensitive files prior to exfiltration. Specifically, the content states that files such as web.config and Windows registry hives were compressed with 7-Zip before being transferred to attacker-controlled infrastructure. The activity is mapped to MITRE ATT&CK T1560.001 (Archive via Utility). The content does not describe 7-Zip itself as malware, but as a dual-use utility leveraged by threat actors including UNC2447 and UAT-8837.
Hunt this family in your stack
Mallory pivots from this family to the IOCs, detections, and named campaigns that touch your stack, and pages you when something new lands.
Groups observed using it
1 distinct threat actor attributed by public researchers. Open in Mallory to see the full evidence chain and overlapping campaigns.
...UNC2447 has been observed using the following tools: ... 7ZIP.
Techniques & procedures
11 distinct techniques documented for this family, organized by ATT&CK tactic.
Stealth
2 techniques
Stealth
Collection
5 techniques
Collection
MAZE Group 1 mapping includes “T1005: Data from Local System,” and narrative describes collecting directory listings and archiving data prior to exfiltration.
MAZE Group 2/3 mappings include “T1039: Data from Network Shared Drive,” and narrative describes archiving data from corporate file shares.
Data Discovery and Staging → with AV blinded and lateral movement achieved, attackers enumerate datastores, databases, and file servers. Common techniques include native tools (Robocopy, PowerShell, xcopy), compressing to encrypted 7-Zip or WinRAR archives on staging hosts... The SFTP server compromise likely served as a staging or exfiltration relay here.
Command and Control
1 technique
Command and Control
Exfiltration
3 techniques
Exfiltration
Victims who refuse to pay face not only locked systems but also the exposure of sensitive corporate records on INC’s data leak site.
Recent activity
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Legitimate compression utility abused to stage data for exfiltration (e.g., compressing web.config and registry hives such as SAM/SYSTEM).
Archiving utility used to compress/stage data prior to exfiltration.
The version that knows your environment.
Match every observed IP, domain, and hash against your live telemetry.
Named campaigns wielding this family, with evidence pinned to each claim.
CVEs this family uses for access and lateral movement.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Every documented technique, ranked by evidence weight.
Reddit, Mastodon, and CTI community discussion around this family.