S1035 · malware · ATT&CK software
Small Sieve
1 actor on record using it
Every mark is an actor ATT&CK records using this software. Red ones also exploit a CVE in CISA KEV.
Open S1035 on attack.mitre.orgSmall 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.
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Security researchers have also noted Small Sieve's use by UNC3313, which may be associated with MuddyWater.
Source: MITRE ATT&CK, S1035. © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation.
- Also known as
- GRAMDOOR
Every one of the 1 is a mark on the map. Named now: 1 to 1, most on record first.
Zoom in on the map and the dots under the middle of it are named where they are.
Data as of 2026-11-15. CVE List through 2026-11-15 · EPSS of 2026-11-15 · CISA KEV checked 2026-11-15. Sources: MITRE ATT&CK (© The MITRE Corporation, reproduced and distributed with its permission), the MISP Galaxy (CC0), and CyberSIXT's own coverage.