InvisibleFerret has collected data utilizing a script that contained a list of excluded files and directory names and naming patterns of interest such as environment and configuration files, documents, spreadsheets, and other files that contained the words secret, wallet, private, and password.14
tool
InvisibleFerret S1245
- Type
- malware
- Platforms
- Linux, macOS, Windows
- Created
- 17 October 2025
- Last modified
- 24 October 2025
InvisibleFerret is a modular python malware that is leveraged for data exfiltration and remote access capabilities.[1][2][3] InvisibleFerret consists of four modules: main, payload, browser, and AnyDesk.[1] InvisibleFerret malware has been leveraged by North Korea-affiliated threat actors identified as DeceptiveDevelopment or Contagious Interview since 2023.[4][2][3][5] InvisibleFerret has historically been introduced to the victim environment through the use of the BeaverTail malware.[6][1][2][3][5]
35
TechniquesTop 4%
10
TacticsTop 6%
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 S1245
InvisibleFerret has collected the local IP address, and external IP.1516
InvisibleFerret has utilized the XOR and Base64 encoding for each of its modules.17 InvisibleFerret has also obfuscated files with a combination of zlib, Base64 and reverse string order.18 InvisibleFerret has also utilized the XOR and Base64 encoding some of its Python scripts.19
InvisibleFerret has identified the user’s UUID and username through the "pay" module.202122
InvisibleFerret has used HTTP communications to the “/Uploads” URI for file exfiltration.23
InvisibleFerret has used FTP to exfiltrate files and directories using the command ssh_upload which contains with six subcommands of .sdira, sdir, sfile, sfinda, sfindr and sfind that had varying functions.2425 InvisibleFerret has exfiltrated stolen files and data to the C2 servers over ports 1224, 2245 and 8637.26
Standing S1245
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
Techniques35Top 4%
96th percentile · 96% of 825 ATT&CK software entries have this many Enterprise techniques or fewer.
Tactics10Top 6%
94th percentile · 94% of 825 ATT&CK software entries have this many tactics spanned or fewer.
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 / technique14med29th pct
29th percentile · 71% of 825 ATT&CK software entries have more detection rules per technique.
Tests / technique5med
Detection coverage S1245
913 distinct rules cover the 35 techniques recorded for this tool. The 999 technique-to-rule mappings resolve to 913 distinct rules, because one rule can cover several techniques. 645 Sigma · 268 Splunk.
31 covered by at least one rule4 with no coverage913 distinct rules in total
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