ksapi64_del.sys - Malicious (88/100) - DriverShield Analysis

Analysis of ksapi64_del.sys: malicious verdict, risk score 88/100. 3 YARA matches, 3/75 multi-engine detections. SHA256 26ed45461e62d733. Kernel imports, IOCTL codes, MITRE ATT&CK, and code-signing details.

ksapi64_del.sys - Analysis Report

DriverShield analyzed the Windows kernel driver ksapi64_del.sys and assigned a verdict of Malicious with a composite risk score of 88/100, indicating malicious indicators (80-100 band).

Verdict	Malicious (88/100)
YARA matches	3
Multi-engine detections	3 / 75
File size	89776 bytes
Code-signing signer	Symantec Time Stamping Services CA - G2
Analyzed	2026-09-06
SHA256	26ed45461e62d733f33671bfd0724399d866ee7606f3f112c90896ce8355392e
SHA1	38ce6a9e00b059c1710b728af9454a3e9f45e579
MD5	6d5fbbb446b119cb151c97b8e16be822

Driver identity

Version resource data embedded in the ksapi64_del.sys PE header, as extracted by the analysis engine.

File description	Kingsoft KSAPI Module
Product	Kingsoft Antivirus Security System
Company	Kingsoft Corporation
Original filename	ksapi.sys
Internal name	ksapi.sys
File version	2017,12,06,132
Copyright	Copyright (C) 1998-2017 Kingsoft Corporation

How the 88/100 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	100 / 100
Dangerous kernel imports	100 / 100
IOCTL dispatch surface	100 / 100
Known-vulnerable corpus	100 / 100
Code-signing state	80 / 100
Packing and entropy	0 / 100
Dynamic behaviour	0 / 100
CVE cross-reference	0 / 100

Kernel imports (33)

Kernel-mode APIs resolved from the Import Address Table of ksapi64_del.sys, ranked by exploitation relevance.

API	Risk	Why it matters
ZwMapViewOfSection	critical	Highly dangerous - potential for arbitrary code execution, memory corruption, or process termination
ZwTerminateProcess	critical	Highly dangerous - potential for arbitrary code execution, memory corruption, or process termination
ZwOpenProcess	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
MmGetSystemRoutineAddress	high	Potentially dangerous - could be used for privilege escalation or security bypass
ZwCreateKey	medium	Moderate risk - system modification capability
ZwSetValueKey	medium	Moderate risk - system modification capability
ZwSetInformationFile	medium	Moderate risk - system modification capability
IoGetDeviceObjectPointer	medium	Moderate risk - system modification capability
ObOpenObjectByPointer	medium	Moderate risk - system modification capability
ZwDeleteKey	medium	Moderate risk - system modification capability
ObReferenceObjectByHandle	medium	Moderate risk - system modification capability
ZwQuerySystemInformation	medium	Moderate risk - system modification capability
KeBugCheckEx	medium	Moderate risk - system modification capability
ExAllocatePoolWithTag	low	Standard kernel API - generally benign
ProbeForWrite	low	Standard kernel API - generally benign
KeInitializeEvent	low	Standard kernel API - generally benign
IoCreateSymbolicLink	low	Standard kernel API - generally benign
RtlInitUnicodeString	low	Standard kernel API - generally benign
IoDeleteDevice	low	Standard kernel API - generally benign
ZwReadFile	low	Standard kernel API - generally benign
ZwQueryValueKey	low	Standard kernel API - generally benign
ZwOpenKey	low	Standard kernel API - generally benign
ZwClose	low	Standard kernel API - generally benign
KeSetEvent	low	Standard kernel API - generally benign
DbgPrint	low	Standard kernel API - generally benign
KeWaitForSingleObject	low	Standard kernel API - generally benign
ZwOpenFile	low	Standard kernel API - generally benign

Showing the 28 highest-relevance imports of 33 resolved.

IOCTL dispatch codes (14)

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
0x0022201C	critical (known exploit)	METHOD_BUFFERED	Process termination by PID (wsftprm)
0x00222000	medium (known exploit)	METHOD_BUFFERED	Driver communication init
0x00347E83	high	METHOD_NEITHER	FILE_DEVICE_DISK Function #4000
0x0022010F	high	METHOD_NEITHER	FILE_DEVICE_UNKNOWN Function #67
0x0022240C	medium	METHOD_BUFFERED	FILE_DEVICE_UNKNOWN Function #2307
0x00222208	medium	METHOD_BUFFERED	FILE_DEVICE_UNKNOWN Function #2178
0x00802484	medium	METHOD_BUFFERED	FILE_DEVICE_CUSTOM Function #2337
0x0080249C	medium	METHOD_BUFFERED	FILE_DEVICE_CUSTOM Function #2343
0x00802824	medium	METHOD_BUFFERED	FILE_DEVICE_CUSTOM Function #2569
0x0080248C	medium	METHOD_BUFFERED	FILE_DEVICE_CUSTOM Function #2339
0x00802494	medium	METHOD_BUFFERED	FILE_DEVICE_CUSTOM Function #2341
0x00229DE8	medium	METHOD_BUFFERED	FILE_DEVICE_UNKNOWN Function #1914
0x0034CB15	medium	METHOD_IN_DIRECT	FILE_DEVICE_DISK Function #709
0x00340350	medium	METHOD_BUFFERED	FILE_DEVICE_DISK Function #212

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	0xCEC4	0xD000	6.13	CODE, EXEC, READ
.data	0x06B0	0x0200	0.59	IDATA, READ, WRITE
.pdata	0x096C	0x0A00	4.34	IDATA, READ
PAGE	0x0098	0x0200	2.38	CODE, EXEC, READ
INIT	0x0E88	0x1000	5.38	CODE, EXEC, READ, WRITE, DISCARD
.rsrc	0x03B0	0x0400	3.17	IDATA, READ, DISCARD
.reloc	0x0054	0x0200	0.27	IDATA, READ, DISCARD

Exploit mitigations

Control Flow Guard	Not enabled
ASLR	Not enabled
DEP	Not enabled
Integrity check	Enforced
Mitigation score	10 / 100

• No CFG - Control Flow Guard is not enabled. Indirect call targets are not validated, making the driver susceptible to control flow hijacking via corrupted function pointers or vtables.
• No ASLR - ASLR is disabled. The driver loads at a predictable address, enabling reliable exploitation of memory corruption vulnerabilities.
• No DEP - DEP is disabled. Data pages are executable, allowing shellcode execution from stack/heap buffers.
• 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 (3)

Rule	Severity	Detects
PUA_VULN_Driver_Kingsoftcorporation_Ksapisys_Kingsoftantivirussecuritysystem_26ED	medium	Detects vulnerable driver mentioned in known-vulnerable driver corpus project using VersionInfo values from the PE header - ksapi.sys. Investigate matches in context: expected filenames or standard ve...
BYOVD_ProcKill	critical	Process termination EDR killer
MAL_EDRKiller	critical	Generic EDR killer pattern

MITRE ATT&CK techniques (14)

Techniques this driver could enable if loaded by an adversary.

ID	Technique	Tactic
T1003.001	OS Credential Dumping: LSASS Memory	Credential Access
T1055.001	Process Injection: DLL Injection	Defense Evasion
T1055.012	Process Hollowing	Defense Evasion
T1068	Exploitation for Privilege Escalation	Privilege Escalation
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	Disable/Modify Tools	Defense Evasion
T1569.002	Service Execution	Execution
T1652	Device Driver Discovery	Discovery

Code-signing chain

Signer	Symantec Time Stamping Services CA - G2
Signer organisation	Symantec Corporation
Issuer	Thawte Timestamping CA
Serial	7E93EBFB7CC64E59EA4B9A77D406FC3B
Valid from	2012-12-21 00:00 UTC
Valid until	2020-12-30 23:59 UTC (expired)
Signature validity	Not verified

• Certificate revision: 0x0200
• Certificate type: PKCS#7
• Chain: Symantec Time Stamping Services Signer - G4
• Chain: Beijing Kingsoft Security software Co.,Ltd
• Chain: VeriSign Class 3 Public Primary Certification Authority - G5
• Chain: VeriSign Class 3 Code Signing 2010 CA

Symbolic execution

Engine angr, status completed, 36 paths explored at a maximum depth of 36. Vulnerability classes reached: 0. Exploitable paths: 0.

Corpus match: this hash is present in the known-vulnerable driver corpus DriverShield cross-references during analysis, which is why the score carries a full weighting on that component.

Frequently asked questions about ksapi64_del.sys

Is ksapi64_del.sys safe?

Based on DriverShield static and dynamic analysis, ksapi64_del.sys is flagged as malicious and should be treated as dangerous. Its composite risk score is 88/100 (verdict: malicious). Always validate findings independently before acting.

What is the risk score of ksapi64_del.sys?

ksapi64_del.sys has a DriverShield composite risk score of 88/100, placing it in the malicious verdict band. SHA256: 26ed45461e62d733f33671bfd0724399d866ee7606f3f112c90896ce8355392e.

What is ksapi64_del.sys?

ksapi64_del.sys is a Windows kernel-mode driver (.sys) analyzed by DriverShield for vulnerabilities, BYOVD abuse potential, and malware indicators. It is code-signed by Symantec Time Stamping Services CA - G2.

Related: Other drivers signed by Symantec Time Stamping Services CA - G2 · What an IOCTL dispatch code is · How YARA matching feeds the score · BYOVD research index · full driver database · CVE library · code signing atlas

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