rasacd.sys - Clean (16/100) - DriverShield Analysis

Analysis of rasacd.sys: clean verdict, risk score 16/100. 0 YARA matches. SHA256 85ccd859a6f587fc. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.

rasacd.sys - Analysis Report

DriverShield analyzed the Windows kernel driver rasacd.sys and assigned a verdict of Clean with a composite risk score of 16/100, indicating no notable risk signals (0-29 band).

Verdict	Clean (16/100)
YARA matches	0
File size	20480 bytes
Analyzed	2026-03-22
SHA256	85ccd859a6f587fcef5c57f8d9ea93907e1247a7956a523b79896bd836fa7649
SHA1	2b11fc1408a61f69879fc215cfe79bacd8a0d56a
MD5	0eca06a818b0bd82e991a6f9f08e58e7

Driver identity

Version resource data embedded in the rasacd.sys PE header, as extracted by the analysis engine.

File description	RAS Automatic Connection Driver
Product	Microsoft® Windows® Operating System
Company	Microsoft Corporation
Original filename	rasacd.sys
Internal name	rasacd.sys
File version	10.0.19041.3636 (WinBuild.160101.0800)
Copyright	© Microsoft Corporation. All rights reserved.

How the 16/100 score breaks down

Each component is scored 0-100 and then weighted into the composite. See the analysis methodology for the exact formula.

Component	Sub-score
Multi-engine consensus	0 / 100
YARA signature matches	0 / 100
Dangerous kernel imports	66 / 100
IOCTL dispatch surface	12 / 100
Known-vulnerable corpus	0 / 100
Code-signing state	50 / 100
Packing and entropy	0 / 100
Dynamic behaviour	0 / 100
CVE cross-reference	0 / 100

Kernel imports (13)

Kernel-mode APIs resolved from the Import Address Table of rasacd.sys, ranked by exploitation relevance.

API	Risk	Why it matters
MmGetSystemRoutineAddress	high	Potentially dangerous - could be used for privilege escalation or security bypass
ObReferenceObjectByHandle	medium	Moderate risk - system modification capability
ExAllocatePoolWithTag	low	Standard kernel API - generally benign
RtlInitUnicodeString	low	Standard kernel API - generally benign
KeWaitForSingleObject	low	Standard kernel API - generally benign
ZwClose	low	Standard kernel API - generally benign
KeSetEvent	low	Standard kernel API - generally benign
IofCompleteRequest	low	Standard kernel API - generally benign
IoDeleteDevice	low	Standard kernel API - generally benign
ExFreePool	low	Standard kernel API - generally benign
IoCreateDevice	low	Standard kernel API - generally benign
KeInitializeEvent	low	Standard kernel API - generally benign
DbgPrint	low	Standard kernel API - generally benign

IOCTL dispatch codes (4)

Control codes reachable through the driver dispatch routine. Codes tied to published exploit code are flagged, since they are the primary Bring Your Own Vulnerable Driver (BYOVD) entry points.

Code	Severity	Transfer	Description
0x0022011B	high	METHOD_NEITHER	FILE_DEVICE_UNKNOWN Function #70
0x002200F0	medium	METHOD_BUFFERED	FILE_DEVICE_UNKNOWN Function #60
0x0080B800	medium	METHOD_BUFFERED	FILE_DEVICE_CUSTOM Function #3584
0x003403A8	medium	METHOD_BUFFERED	FILE_DEVICE_DISK Function #234

PE sections

Section layout and Shannon entropy. High entropy in a code section is a packing or encryption indicator.

Section	Virtual size	Raw size	Entropy	Flags
.text	0x2029	0x2200	5.94	CODE, EXEC, READ
.rdata	0x06E0	0x0800	3.97	IDATA, READ
.data	0x01A0	0x0200	0.28	IDATA, READ, WRITE
.pdata	0x0240	0x0400	2.53	IDATA, READ
.idata	0x0512	0x0600	3.86	IDATA, READ
PAGE	0x0282	0x0400	4.3	CODE, EXEC, READ
INIT	0x04A2	0x0600	4.92	CODE, EXEC, READ, DISCARD
GFIDS	0x003C	0x0200	0.57	IDATA, READ, DISCARD
.rsrc	0x0410	0x0600	2.48	IDATA, READ, DISCARD
.reloc	0x0270	0x0400	3.15	IDATA, READ, DISCARD

Exploit mitigations

Control Flow Guard	Enabled
ASLR	Enabled
DEP	Enabled
Integrity check	Not enforced
Mitigation score	80 / 100

CFG Enabled - Control Flow Guard is active - indirect calls are validated against a bitmap of valid targets at runtime.
ASLR Enabled - Address Space Layout Randomization is active - base address is randomized on each load.
DEP/NX Enabled - Data Execution Prevention is active - non-executable pages cannot be executed.
Unsigned - The driver is not digitally signed. It requires test signing mode or a bootloader exploit to load on 64-bit Windows.

MITRE ATT&CK techniques (6)

Techniques this driver could enable if loaded by an adversary.

ID	Technique	Tactic
T1211	Exploitation for Defense Evasion	Defense Evasion
T1543.003	Windows Service	Persistence
T1553.002	Subvert Trust Controls: Code Signing	Defense Evasion
T1553.006	Code Signing Policy Modification	Defense Evasion
T1569.002	Service Execution	Execution
T1652	Device Driver Discovery	Discovery

Symbolic execution

Engine angr, status no_findings, 0 paths explored at a maximum depth of 0. Vulnerability classes reached: 0. Exploitable paths: 0.

Frequently asked questions about rasacd.sys

Is rasacd.sys safe?

Based on DriverShield static and dynamic analysis, rasacd.sys is assessed as clean, with no notable risk signals. Its composite risk score is 16/100 (verdict: clean). Always validate findings independently before acting.

What is the risk score of rasacd.sys?

rasacd.sys has a DriverShield composite risk score of 16/100, placing it in the clean verdict band. SHA256: 85ccd859a6f587fcef5c57f8d9ea93907e1247a7956a523b79896bd836fa7649.

What is rasacd.sys?

rasacd.sys is a Windows kernel-mode driver (.sys) analyzed by DriverShield for vulnerabilities, BYOVD abuse potential, and malware indicators.