Add rules for BRATA#78
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* Adds rule #00276 "Acquire a wake lock to keep the device awake", generated from analysis of BRATA samples. The rule pairs Context.getSystemService() (to obtain the PowerManager) with PowerManager.WakeLock.acquire(). BRATA is a remote-access trojan whose background service holds a wake lock so the OS does not suspend the device while it is being remotely controlled; Quark observed this at Level 5 inside the malware's own service (e.g. Lcom/vera/GeneralService) across several samples. Wake locks are a dual-use API, so after training this rule carries a near-zero score (-0.14) — it is a weak supporting signal, not a standalone indicator. * Re-tunes the existing 275 rules' scores from the score-adjustment training pass run with the BRATA sample set added to the corpus (recall=1.0 over 432 malware samples, precision=0.77). 272 rules changed score; 4 were unchanged. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Closing — analysis showed BRATA does not need a new rule. The candidate rule (#00276, "Acquire a wake lock to keep the device awake") provides no detection value:
BRATA's detectable malicious behaviors are already covered by existing rules (screen capture #00210, contact reads #00187/#00212/#00215, security-software discovery #00265). The rule pool is effectively saturated for this family, so no new rule is warranted. The BRATA analysis report (quark-engine PR #917) stands on the existing rules and is unaffected. |
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close #77