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Small Sieve

S1035 · Windows

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.

ATT&CK S1035 1 actors documented
Sigma rules0 YARA rules0 Live IOCs0
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Actors Using This

1
iranMuddyWater
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Aliases
Small Sieve, GRAMDOOR
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