QUIETEXIT can attempt to connect to a second hard-coded C2 if the first hard-coded C2 address fails.2
tool
QUIETEXIT S1084
- Type
- malware
- Platform
- Network Devices
- Created
- 17 August 2023
- Last modified
- 15 April 2025
QUIETEXIT is a novel backdoor, based on the open-source Dropbear SSH client-server software, that has been used by APT29 since at least 2021. APT29 has deployed QUIETEXIT on opaque network appliances that typically don't support antivirus or endpoint detection and response tools within a victim environment.[1]
5
TechniquesBottom 23%
2
TacticsBottom 12%
1
Threat groupunranked
0
CampaignsNone recorded
Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.
MITRE reference S1084
QUIETEXIT has attempted to change its name to cron upon startup. During incident response, QUIETEXIT samples have been identified that were renamed to blend in with other legitimate files.3
QUIETEXIT can use an inverse negotiated SSH connection as part of its C2.4
QUIETEXIT can establish a TCP connection as part of its initial connection to the C2.6
Standing S1084
Reach is how much of ATT&CK this tool touches. Coverage is how well defended each thing it does is, as a median per technique rather than a total — a total would just restate the reach. Each figure is ranked against all 825 ATT&CK software entries only where that population actually spreads. Where most of the population shares one value, a percentile would rank the tie instead of the entity, so the raw value is shown and no rank is claimed.
Reach
Techniques5Bottom 23%
23rd percentile · 77% of 825 ATT&CK software entries have more Enterprise techniques.
Tactics2Bottom 12%
12th percentile · 88% of 825 ATT&CK software entries have more tactics spanned.
Threat group161% tie · 22 values
61% of the population shares a single value across only 22 distinct values, so a percentile here would rank the tie, not the entity.
Campaigns085% tie · 8 values
85% of the population shares a single value across only 8 distinct values, so a percentile here would rank the tie, not the entity.
Coverage
Rules / technique5medBottom 6%
6th percentile · 94% of 825 ATT&CK software entries have more detection rules per technique.
Tests / technique1med
Detection coverage S1084
53 distinct rules cover the 5 techniques recorded for this tool. 38 Sigma · 15 Splunk.
5 covered by at least one rule53 distinct rules in total
tf
Loading...Drag headers to reorder | Drag edges to resize
tf
Loading detections...
| Select | Title | Description | Category | Status | Event | Product | MITRE ATT&CK | CVEs | Severity | Author | Created | Updated | ID | Refs |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
© 2026 The MITRE Corporation. ATT&CK® and D3FEND™ data reproduced with permission. SigmaHQ detection rules licensed under DRL 1.1. attack.mitre.org · d3fend.mitre.org · CAR analytics licensed under Apache 2.0 · car.mitre.org