Raindrop used a custom packer for its Cobalt Strike payload, which was compressed using the LZMA algorithm.34
tool
Raindrop S0565
- Type
- malware
- Platform
- Windows
- Created
- 19 January 2021
- Last modified
- 11 April 2024
Raindrop is a loader used by APT29 that was discovered on some victim machines during investigations related to the SolarWinds Compromise. It was discovered in January 2021 and was likely used since at least May 2020.[1][2]
7
Techniques33rd pct
2
TacticsBottom 12%
1
Threat groupunranked
1
Campaignunranked
Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.
MITRE reference S0565
Raindrop used steganography to locate the start of its encoded payload within legitimate 7-Zip code.5
Raindrop encrypted its payload using a simple XOR algorithm with a single-byte key.67
Raindrop was built to include a modified version of 7-Zip source code (including associated export names) and Far Manager source code.89
Raindrop was installed under names that resembled legitimate Windows file and directory names.1011
Raindrop decrypted its Cobalt Strike payload using an AES-256 encryption algorithm in CBC mode with a unique key per sample.1213
Standing S0565
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
Techniques733rd pct
33rd percentile · 67% 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.
Campaign185% 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 / technique3med
Detection coverage S0565
109 distinct rules cover the 7 techniques recorded for this tool. The 110 technique-to-rule mappings resolve to 109 distinct rules, because one rule can cover several techniques. 84 Sigma · 25 Splunk.
7 covered by at least one rule109 distinct rules in total
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