ATT&CK

Threat actorsMITRE ATT&CK intrusion sets Malware & toolsSoftware families & tooling TechniquesTactics & techniques

ReportsPublished APT reporting SourcesEvery feed behind the archive

Developers

JSON APIFree CORS-enabled endpoints MCP serverModel Context Protocol access Source codeThis project on GitHub

Loading the archive…

Open Threat Intel Archive

Indicators are treated as facts and kept with their source_vendor, source URL, and dates; every feed is credited and redistribution-restricted feeds are flagged, not dropped. ATT&CK content is © MITRE, used under its terms. See NOTICE. The archive reports intelligence; it does not editorialize threat.

Indicators Actors Sources API GitHub

Open Threat Intel Archive

← Malware & tools

S1035malware

Small Sieve

a.k.a. GRAMDOOR

Small Sieve is a Telegram Bot API-based Python backdoor that has been distributed using a Nullsoft Scriptable Install System (NSIS) Installer; it has been used by MuddyWater since at least January 2022. Security researchers have also noted Small Sieve's use by UNC3313, which may be associated with MuddyWater.

Platforms: Windows

MITRE ATT&CK ↗

Linked entities · 14

usesT1059.003Windows Command Shell usesT1105Ingress Tool Transfer usesT1132.002Non-Standard Encoding usesT1480Execution Guardrails usesT1016System Network Configuration Disc…usesT1573.002Asymmetric Cryptography usesT1059.006Python usesT1547.001Registry Run Keys / Startup Folder usesT1036.005Match Legitimate Resource Name or…usesT1027Obfuscated Files or Information usesT1033System Owner/User Discovery usesT1102.002Bidirectional Communication usesT1071.001Web Protocols uses byG0069MuddyWater