Downdelph inserts pseudo-random characters between each original character during encoding of C2 network requests, making it difficult to write signatures on them.2
tool
Downdelph S0134
- Type
- malware
- Platform
- Windows
- Created
- 31 May 2017
- Last modified
- 25 April 2025
Downdelph is a first-stage downloader written in Delphi that has been used by APT28 in rare instances between 2013 and 2015. [1]
5
TechniquesBottom 23%
4
Tactics32nd pct
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 S0134
Standing S0134
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.
Tactics432nd pct
32nd percentile · 68% 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 / technique76medTop 1%
99th percentile · 99% of 825 ATT&CK software entries have this many detection rules per technique or fewer.
Tests / technique7med
Detection coverage S0134
314 distinct rules cover the 5 techniques recorded for this tool. The 315 technique-to-rule mappings resolve to 314 distinct rules, because one rule can cover several techniques. 237 Sigma · 77 Splunk.
3 covered by at least one rule2 with no coverage314 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