MalwareBazaar Database

c4ffeine

Foxveil 'cc2' build Mach-O, the TWELFTH payload served from this one unchanged URL (fat x86_64+arm64, 871,872 B), fetched via Tor 2026-09-21 01:47:57 UTC, origin build time 01:02:53, 1 hour 1 minute after the previous build. The origin is nginx, so each build time is readable from the ETag: the payloads served behind this URL were stamped 2026-09-20 07:02:41, 09:02:47, 11:03:28, 14:01:46, 15:02:41, 16:02:02, 20:05:52, 21:01:38 and 2026-09-21 00:01:43 and 01:02:53 UTC. The job skips hours rather than running on a fixed interval, and the gaps measured so far run from 55 minutes to 4 hours 3 minutes. Hash sequence on the same URL: a3dabccd14492f4c70658ece96a3ed7b4e275ff9d70c434298bd6f863d1e24b9 (987,264 B, 2026-09-18), ec780ca8df9d10df905f3f77641f88ece7651303843802c37a57c484c6251a42, 610ae82d0d872334ba68718030bdeb0c2d23ce592b4c9022fbb225b0208b884a, 233fd2c05865e6fc7034e61bf98e64f7afeb24c1b3e88539895eeff764ebb740, 336f4bf8eb4d76c91f936beabe3a061b43db46d2cc85e6dc82dd22f9194191fc, 8e7d88f5adef0f2706fbc6df433e3c76d81c4b799389319e60a4639fc1c088a1, f03b8beef33330786b3f3f12e2bf2c352d4f14b8e6d5a78180205c7cccdcefb7, 6f994814774412107510aede65422e66c1e825f57bd3ae5d0f173aa2c54893d5, a2da9aba412172006b2ba30e2168ec030dabcdf8c46e6895ffba1c26834251a6, 382a3e22d91b93c67de463fde451870620e661b8e96f40a4ece80a2d3543a03f, c254bf1cd9ab1496ad01785ed181bd6e314534bb1f079a4bc4616b40a8fd62ee (905,200 B, 2026-09-21 00:01:43), then this one. The stage-1 zsh dropper at the same host has stayed byte-identical since 2026-09-18 12:56:51 (sha256 6e753133e537264247a08587d87b30b8d9a96caea1d6cc92d41fc8058073b8f7) and was re-checked unchanged at this fetch: the delivery chain is fixed and only the payload rotates, which is why every build in this series arrives at 0 detections. Earlier builds in the series were unpacked statically and each held the same AMOS AppleScript stealer, with the same 47 handlers, hosts and persistence, decrypted with a key derived from the SHA-256 of the loader's own __text section, so each repack rekeys itself. What rotates is the wrapper: obfuscation volume, PBKDF2 iteration count, encrypted item count and table layout, tokens and the ad-hoc code signing identity. This build is the closest wrapper match yet measured in the series: 40 __text functions against the previous build's 40, 23 of them hashing identically, and a TLSH comparison of __text scoring 29 where earlier consecutive pairs scored in the 50s. The encrypted payload table holds 78 items totalling 195,218 bytes of plaintext against 66 items and 195,928 bytes in the previous build, a 0.4 percent move: the same script re-chunked. Host answers HTTP 200 only to a curl User-Agent; browser User-Agents get a Cloudflare 520 on every path including the root. Not executed.