Remsec

MITRE ATT&CK: S0125 View on attack.mitre.org

Aliases: Backdoor.Remsec, ProjectSauron, Remsec

First seen
2011-03-01 00:00:00
Malware type
backdoor, spyware
Family
Malware family
Operating systems
windows
Last IoC activity
2026-07-15 16:45:04
Profile updated
2026-07-07 15:44:54

Targeted industries: government-and-public-sector technology-and-telecommunications

Targeted regions: country_code:ru country_code:cn country_code:us

Context

Remsec is a modular backdoor that has been used by Strider and appears to have been designed primarily for espionage purposes. Many of its modules are written in Lua.

Detection coverage

  • 1 YARA rules
  • 410 Sigma rules

Malware & tools used

  • Dynamic-link Library Injection (attack-pattern)
  • Exploitation for Privilege Escalation (attack-pattern)
  • Exfiltration over USB (attack-pattern)
  • File and Directory Discovery (attack-pattern)
  • Windows Host Firewall (attack-pattern)
  • Exfiltration Over Unencrypted Non-C2 Protocol (attack-pattern)
  • System Network Connections Discovery (attack-pattern)
  • File Deletion (attack-pattern)
  • Keylogging (attack-pattern)
  • Process Discovery (attack-pattern)
  • Encrypted/Encoded File (attack-pattern)
  • Password Filter DLL (attack-pattern)
  • Match Legitimate Resource Name or Location (attack-pattern)
  • Non-Application Layer Protocol (attack-pattern)
  • Remote System Discovery (attack-pattern)
  • Mail Protocols (attack-pattern)
  • Lua (attack-pattern)
  • Ingress Tool Transfer (attack-pattern)
  • Security Account Manager (attack-pattern)
  • Data from Removable Media (attack-pattern)
  • Scheduled Task (attack-pattern)
  • System Information Discovery (attack-pattern)
  • Local Account (attack-pattern)
  • System Network Configuration Discovery (attack-pattern)
  • System Owner/User Discovery (attack-pattern)

Used by threat actors

Detection rules

  • MALPEDIA_Win_Remsec_Strider_Auto (yara-rule)

Reports & references

  • Broadcom/Symantec — Viewdocument (report)
  • Broadcom/Symantec — Strider Cyberespionage Group Turns Eye Sauron Targets (report)
  • Kaspersky — 75533 (report)
  • malpedia.caad.fkie.fraunhofer.de — Win.Remsec Strider (report)
  • artemonsecurity.blogspot.com — Remsec Driver Analysis (report)
  • artemonsecurity.blogspot.com — Remsec Driver Analysis Part 2 (report)
  • Broadcom/Symantec — Symantec Remsec Iocs (report)
  • artemonsecurity.blogspot.com — Remsec Driver Analysis Part 3 (report)
  • MITRE ATT&CK — S0125 (report)

External references