Kerrdown can encrypt, encode, and compress multiple layers of shellcode.3
tool
Kerrdown S0585
- Type
- malware
- Platform
- Windows
- Created
- 2 March 2021
- Last modified
- 25 April 2025
Kerrdown is a custom downloader that has been used by APT32 since at least 2018 to install spyware from a server on the victim's network.[1][2]
11
Techniques51st pct
5
Tactics41st 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 S0585
Kerrdown can encrypt, encode, and compress multiple layers of shellcode.4
Kerrdown can use a VBS base64 decoder function published by Motobit.5
Kerrdown has the ability to determine if the compromised host is running a 32 or 64 bit OS architecture.6
Kerrdown can download specific payloads to a compromised host based on OS architecture.7
Kerrdown can decode, decrypt, and decompress multiple layers of shellcode.8
Standing S0585
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
Techniques1151st pct
51st percentile · 51% of 825 ATT&CK software entries have this many Enterprise techniques or fewer.
Tactics541st pct
41st percentile · 59% 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 / technique36medTop 17%
83rd percentile · 83% of 825 ATT&CK software entries have this many detection rules per technique or fewer.
Tests / technique3med
Detection coverage S0585
468 distinct rules cover the 11 techniques recorded for this tool. The 491 technique-to-rule mappings resolve to 468 distinct rules, because one rule can cover several techniques. 323 Sigma · 145 Splunk.
10 covered by at least one rule1 with no coverage468 distinct rules in total
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