In YARA 3.8.1, bytecode in a specially crafted compiled rule can read data from any arbitrary address in memory, in libyara/exec.c. Specifically, OP_COUNT can read a DWORD.
Exploitability
AV:LAC:LPR:NUI:RScope
S:UImpact
C:HI:NA:N5.5/CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N