Resocks
Resocks is a reverse SOCKS5 proxy utility used to tunnel traffic and turn a compromised host into a relay point for attacker access. The content describes it as a readily accessible proxy tool from GitHub and notes observed samples built with the Go obfuscation utility garble. It has been used by multiple threat actors and clusters as post-compromise infrastructure rather than as a standalone payload.
Reported users include the ransomware group Crypt Ghouls, the espionage-focused Hydra Saiga / Yorotrooper / ShadowSilk / Silent Lynx cluster, and the espionage cluster Curly COMrades. In Crypt Ghouls intrusions targeting Russian businesses and government agencies, resocks was used alongside AnyDesk and Localtonet for remote access and tunneling after initial access via compromised contractor credentials over VPN. One observed sample was configured to connect back to 91.142.73[.]178 in the VDSina network using a specified connection key. Kaspersky also reported overlap between Crypt Ghouls and MorLock through use of the same resocks utility.
In Hydra Saiga activity targeting government, energy, and critical infrastructure in Central Asia, Europe, and the Middle East, resocks was part of a broader hands-on-keyboard post-exploitation toolkit that also included Havoc and Meterpreter. The actor used WMI or PsExec to deploy a reverse SOCKS5 proxy client for lateral movement and remote operations.
In Curly COMrades operations targeting judicial and government entities in Georgia and an energy distribution company in Moldova, Resocks was the most frequently observed proxy tool. The actor used it with SSH and Stunnel to establish multiple entry points into victim networks and to relay remote command execution. Persistence for proxy tooling was maintained via scheduled tasks and Windows services with names chosen to resemble legitimate components. Observed Resocks C2 endpoints in that reporting included 91.107.174[.]190, 96.30.124[.]103, 194.87.31[.]171, 75.127.13[.]136, 94.131.109[.]91, and 207.180.194[.]109, commonly over port 443 and in one case port 8443.
Overall, the content supports high-confidence characterization of Resocks as a reverse SOCKS5 proxy/tunneling tool used for covert remote access, traffic relay, and lateral movement in both ransomware and espionage operations.
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Groups observed using it
5 distinct threat actors attributed by public researchers. Open in Mallory to see the full evidence chain and overlapping campaigns.
These tools were commonly packaged in password-protected RAR archives, and ranged from reverse proxy clients like resocks and tunnelling software like chisel...
Techniques & procedures
6 distinct techniques documented for this family, organized by ATT&CK tactic.
IOCs tracked for this family
13 indicators attributed across vendor reports, sandbox runs, and researcher write-ups. Full values are available in Mallory.
IPs, domains, and DNS infrastructure linked to this family.
File hashes (MD5, SHA-1, SHA-256) from samples and reports.
Other indicator types observed in public reporting.
Recent activity
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Reverse SOCKS5 proxy used for tunneling traffic and remote access, including samples configured to connect back to attacker-controlled infrastructure.
An open-source reverse SOCKS5 proxy used for pivoting/tunneling and maintaining operator connectivity during post-exploitation; Hydra Saiga used it for lateral movement and to establish proxy access back to their infrastructure.
Go-based proxy tool used as a relay/egress mechanism to route attacker traffic through compromised infrastructure.
Proxy/SOCKS utility used to route traffic and support covert connectivity during operations.
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.