Small Sieve
- ID
- S1035
- Type
- Malware
- Associated names
- GRAMDOOR
- Platforms
- Windows
- Source
- attack.mitre.org
- MITRE last modified
- 17 Apr 2025
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.[1][2]
Security researchers have also noted Small Sieve's use by UNC3313, which may be associated with MuddyWater.[3]
Techniques used (13)
- T1016 System Network Configuration Discovery
- T1027 Obfuscated Files or Information
- T1033 System Owner/User Discovery
- T1036.005 Match Legitimate Resource Name or Location
- T1059.003 Windows Command Shell
- T1059.006 Python
- T1071.001 Web Protocols
- T1102.002 Bidirectional Communication
- T1105 Ingress Tool Transfer
- T1132.002 Non-Standard Encoding
- T1480 Execution Guardrails
- T1547.001 Registry Run Keys / Startup Folder
- T1573.002 Asymmetric Cryptography