appid.sys - Suspicious (58/100) - DriverShield Analysis

Analysis of appid.sys: suspicious verdict, risk score 58/100. 2 YARA matches, 0/76 multi-engine detections. SHA256 7031fec4cebddad6. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.

appid.sys - Analysis Report

DriverShield analyzed the Windows kernel driver appid.sys and assigned a verdict of Suspicious with a composite risk score of 58/100, indicating some risk signals warranting review (30-59 band).

Verdict	Suspicious (58/100)
YARA matches	2
Multi-engine detections	0 / 76
File size	208696 bytes
Code-signing signer	Microsoft Windows
Analyzed	2026-09-06
SHA256	7031fec4cebddad6e55df0da8d17c1c5eec92899a816130d1f68916bda39e03a
SHA1	719a0abe5f17040a69a604bde633397348c618ee
MD5	48a2317dce7698fada2420608ed15efe

Driver identity

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

File description	AppID Driver
Product	\VarFileInfo\Translation
Company	Microsoft Corporation
Original filename	appid.sys
Internal name	appid.sys
File version	10.0.19041.488 (WinBuild.160101.0800)
Copyright	© Microsoft Corporation. All rights reserved.

How the 58/100 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	55 / 100
Dangerous kernel imports	100 / 100
IOCTL dispatch surface	100 / 100
Known-vulnerable corpus	0 / 100
Code-signing state	80 / 100
Packing and entropy	0 / 100
Dynamic behaviour	0 / 100
CVE cross-reference	0 / 100

Kernel imports (31)

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

API	Risk	Why it matters
MmGetSystemRoutineAddress	high	Potentially dangerous - could be used for privilege escalation or security bypass
PsSetCreateProcessNotifyRoutineEx	high	Potentially dangerous - could be used for privilege escalation or security bypass
PsLookupProcessByProcessId	high	Potentially dangerous - could be used for privilege escalation or security bypass
ZwOpenProcess	high	Potentially dangerous - could be used for privilege escalation or security bypass
ZwDeleteFile	medium	Moderate risk - system modification capability
ObReferenceObjectByHandle	medium	Moderate risk - system modification capability
KeBugCheckEx	medium	Moderate risk - system modification capability
ZwSetValueKey	medium	Moderate risk - system modification capability
ObOpenObjectByPointer	medium	Moderate risk - system modification capability
ZwWriteFile	medium	Moderate risk - system modification capability
ZwCreateKey	medium	Moderate risk - system modification capability
ZwQueryValueKey	low	Standard kernel API - generally benign
SeAccessCheck	low	Standard kernel API - generally benign
ZwQueryInformationFile	low	Standard kernel API - generally benign
IoCreateDevice	low	Standard kernel API - generally benign
ZwClose	low	Standard kernel API - generally benign
ZwOpenKey	low	Standard kernel API - generally benign
KeDelayExecutionThread	low	Standard kernel API - generally benign
IoCreateSymbolicLink	low	Standard kernel API - generally benign
IoDeleteDevice	low	Standard kernel API - generally benign
RtlInitAnsiString	low	Standard kernel API - generally benign
IoDeleteSymbolicLink	low	Standard kernel API - generally benign
KeWaitForSingleObject	low	Standard kernel API - generally benign
ZwCreateFile	low	Standard kernel API - generally benign
ZwReadFile	low	Standard kernel API - generally benign
KeInitializeEvent	low	Standard kernel API - generally benign
IofCompleteRequest	low	Standard kernel API - generally benign
RtlInitUnicodeString	low	Standard kernel API - generally benign

Showing the 28 highest-relevance imports of 31 resolved.

IOCTL dispatch codes (40)

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
0x0080880F	high	METHOD_NEITHER	FILE_DEVICE_CUSTOM Function #515
0x00340063	high	METHOD_NEITHER	FILE_DEVICE_DISK Function #24
0x00340033	high	METHOD_NEITHER	FILE_DEVICE_DISK Function #12
0x0022007B	high	METHOD_NEITHER	FILE_DEVICE_UNKNOWN Function #30
0x00340037	high	METHOD_NEITHER	FILE_DEVICE_DISK Function #13
0x00223417	high	METHOD_NEITHER	FILE_DEVICE_UNKNOWN Function #3333
0x0080860F	high	METHOD_NEITHER	FILE_DEVICE_CUSTOM Function #387
0x008045C7	high	METHOD_NEITHER	FILE_DEVICE_CUSTOM Function #369
0x00808F03	high	METHOD_NEITHER	FILE_DEVICE_CUSTOM Function #960
0x00808F8B	high	METHOD_NEITHER	FILE_DEVICE_CUSTOM Function #994
0x0080840F	high	METHOD_NEITHER	FILE_DEVICE_CUSTOM Function #259
0x0022BB07	high	METHOD_NEITHER	FILE_DEVICE_UNKNOWN Function #3777
0x0022E8CF	high	METHOD_NEITHER	FILE_DEVICE_UNKNOWN Function #2611
0x00806583	high	METHOD_NEITHER	FILE_DEVICE_CUSTOM Function #2400
0x002200F0	medium	METHOD_BUFFERED	FILE_DEVICE_UNKNOWN Function #60
0x0080EF0D	medium	METHOD_IN_DIRECT	FILE_DEVICE_CUSTOM Function #3011
0x00805715	medium	METHOD_IN_DIRECT	FILE_DEVICE_CUSTOM Function #1477
0x00801715	medium	METHOD_IN_DIRECT	FILE_DEVICE_CUSTOM Function #1477
0x00802494	medium	METHOD_BUFFERED	FILE_DEVICE_CUSTOM Function #2341
0x00802484	medium	METHOD_BUFFERED	FILE_DEVICE_CUSTOM Function #2337
0x0080248C	medium	METHOD_BUFFERED	FILE_DEVICE_CUSTOM Function #2339
0x00228348	medium	METHOD_BUFFERED	FILE_DEVICE_UNKNOWN Function #210
0x00228330	medium	METHOD_BUFFERED	FILE_DEVICE_UNKNOWN Function #204
0x00220020	medium	METHOD_BUFFERED	FILE_DEVICE_UNKNOWN Function #8

Showing 24 of 40 extracted control codes.

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	0x533F	0x5400	6.27	CODE, EXEC, READ
.rdata	0xE9C0	0xEA00	4.44	IDATA, READ
.data	0x08A8	0x0200	3.04	IDATA, READ, WRITE
.pdata	0x10C8	0x1200	5.15	IDATA, READ
.idata	0x20F4	0x2200	4.88	IDATA, READ
PAGE	0x16CE5	0x16E00	6.31	CODE, EXEC, READ
INIT	0x0D22	0x0E00	6.01	CODE, EXEC, READ, DISCARD
GFIDS	0x009C	0x0200	1.8	IDATA, READ, DISCARD
.rsrc	0x03E0	0x0400	3.28	IDATA, READ, DISCARD
.reloc	0x123C	0x1400	5.85	IDATA, READ, DISCARD

Exploit mitigations

Control Flow Guard	Enabled
ASLR	Enabled
DEP	Enabled
Integrity check	Enforced
Mitigation score	90 / 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.
Expired Certificate - The driver is signed but the certificate has expired. Windows may still load it depending on revocation policy.
Force Integrity - IMAGE_DLLCHARACTERISTICS_FORCE_INTEGRITY is set - the OS validates the signature before loading.

YARA rule matches (2)

Rule	Severity	Detects
SUSP_Callbacks	medium	Kernel callback registration
MAL_DSEBypass	critical	DSE bypass attempt

MITRE ATT&CK techniques (14)

Techniques this driver could enable if loaded by an adversary.

ID	Technique	Tactic
T1014	Rootkit	Defense Evasion
T1055.001	Process Injection: DLL Injection	Defense Evasion
T1071	Application Layer Protocol	Command and Control
T1112	Modify Registry	Defense Evasion
T1211	Exploitation for Defense Evasion	Defense Evasion
T1489	Service Stop	Impact
T1543.003	Windows Service	Persistence
T1547.001	Registry Run Keys	Persistence
T1553.002	Subvert Trust Controls: Code Signing	Defense Evasion
T1562.001	Impair Defenses: Disable/Modify Tools	Defense Evasion
T1562.006	Indicator Blocking	Defense Evasion
T1564.001	Hidden Files and Directories	Defense Evasion
T1569.002	Service Execution	Execution
T1652	Device Driver Discovery	Discovery

Code-signing chain

Signer	Microsoft Windows
Signer organisation	Microsoft Corporation
Issuer	Microsoft Windows Production PCA 2011
Serial	3300000266BD1580EFA75CD6D3000000000266
Valid from	2020-03-04 18:30 UTC
Valid until	2021-03-03 18:30 UTC (expired)
Signature validity	Not verified

Certificate revision: 0x0200
Certificate type: PKCS#7
Chain: Microsoft Windows Production PCA 2011

Symbolic execution

Engine angr, status completed, 46 paths explored at a maximum depth of 46. Vulnerability classes reached: 0. Exploitable paths: 1.

Frequently asked questions about appid.sys

Is appid.sys safe?

Based on DriverShield static and dynamic analysis, appid.sys shows some suspicious signals and warrants manual review. Its composite risk score is 58/100 (verdict: suspicious). Always validate findings independently before acting.

What is the risk score of appid.sys?

appid.sys has a DriverShield composite risk score of 58/100, placing it in the suspicious verdict band. SHA256: 7031fec4cebddad6e55df0da8d17c1c5eec92899a816130d1f68916bda39e03a.

What is appid.sys?

appid.sys is a Windows kernel-mode driver (.sys) analyzed by DriverShield for vulnerabilities, BYOVD abuse potential, and malware indicators. It is code-signed by Microsoft Windows.