malware

P.A.S. Webshell S0598

Type: malware
Platforms: Linux, Windows
Created: 13 April 2021
Last modified: 25 April 2025

P.A.S. Webshell is a publicly available multifunctional PHP webshell in use since at least 2016 that provides remote access and execution on target web servers.[1]

Techniques66th pct

TacticsTop 20%

Threat groupsunranked

CampaignsNone recorded

Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.

Standing S0598

Reach is how much of ATT&CK this malware touches. Coverage is how well defended each thing it does is, as a median per technique rather than a total — a total would just restate the reach. Each figure is ranked against all 825 ATT&CK software entries only where that population actually spreads. Where most of the population shares one value, a percentile would rank the tie instead of the entity, so the raw value is shown and no rank is claimed.

Select	Description	Category	Status	Event	OS	Product	MITRE ATT&CK	CVEs	Severity	Author	Created	Updated	ID
	Detects potential DLL sideloading of DLLs that are known to be abused from suspicious locations	Generic	test	image_load	windows	Sysmon	Execution Command and Scripting Interpreter	-	high	X__Junior (Nextron Systems)	2023-07-11	—	799a5f48-0ac1-4e0f-9152-71d137d48c2a
	Detects usage of winget to add a new insecure (http) download source. (...)	Generic	test	process_creation	windows	Sysmon · WinEventLog Security	Execution Command and Scripting Interpreter	-	high	Nasreddine Bencherchali (Nextron Systems)	2023-04-17	—	81a0ecb5-0a41-4ba1-b2ba-c944eb92bfa2
	Detects usage of winget to add new additional download sources	Generic	test	process_creation	windows	Sysmon · WinEventLog Security	Execution Command and Scripting Interpreter	-	medium	Nasreddine Bencherchali (Nextron Systems)	2023-04-17	—	05ebafc8-7aa2-4bcd-a269-2aec93f9e842
	Detects usage of winget to add new potentially suspicious download sources	Generic	test	process_creation	windows	Sysmon · WinEventLog Security	Execution Command and Scripting Interpreter	-	medium	Nasreddine Bencherchali (Nextron Systems)	2023-04-17	2023-12-04	c15a46a0-07d4-4c87-b4b6-89207835a83b
	Detects suspicious local connections via a named pipe to the AD FS configuration database (Windows Internal Database). (...)	Generic	test	pipe_created	windows	Sysmon	Collection Data from Local System	-	medium	Roberto Rodriguez @Cyb3rWard0g	2021-10-08	2023-11-30	1ea13e8c-03ea-409b-877d-ce5c3d2c1cb3
	Detects the deletion of the "Zone.Identifier" ADS. (...)	Hunting	test	file_delete	windows	Sysmon	Stealth Indicator Removal File Deletion	-	low	frack113	2023-09-04	—	7eac0a16-5832-4e81-865f-0268a6d19e4b
	Detects the deletion of the "Zone.Identifier" ADS by an uncommon process. (...)	Generic	test	file_delete	windows	Sysmon	Stealth Indicator Removal File Deletion	-	medium	Nasreddine Bencherchali (Nextron Systems)	2023-09-04	2025-07-04	3109530e-ab47-4cc6-a953-cac5ebcc93ae
Splunk	The following analytic detects the execution of network scanning utilities such as Advanced IP Scanner or Advanced Port Scanner. (...)	Anomaly	stable	process_creation	windows	Sysmon · WinEventLog Security · CrowdStrike	Discovery Network Service Discovery Discovery Network Share Discovery	-	medium	Nasreddine Bencherchali, Splunk	2025-10-24	2026-05-13	9a4e50c7-5b62-4d52-93b4-f2b61332e9a5
	Detects the use of Advanced IP Scanner. (...)	Generic	test	file_event	windows	Sysmon	Discovery Network Service Discovery	-	medium	@ROxPinTeddy	2020-05-12	2022-11-29	fed85bf9-e075-4280-9159-fbe8a023d6fa
	Detects a highly relevant Antivirus alert that reports a web shell. (...)	Generic	test	antivirus	-	-	Persistence Server Software Component Web Shell	-	high	Florian Roth (Nextron Systems), Arnim Rupp	2018-09-09	2026-06-29	fdf135a2-9241-4f96-a114-bb404948f736
	Detects DNS queries made by "AppInstaller.EXE". (...)	Generic	test	dns	windows	Sysmon	Command and Control Ingress Tool Transfer	-	medium	frack113	2021-11-24	2023-11-09	7cff77e1-9663-46a3-8260-17f2e1aa9d0a
	Detects suspicious user agent strings used in APT malware in proxy logs	Generic	test	proxy	-	-	Command and Control Application Layer Protocol Web Protocols	-	high	Florian Roth (Nextron Systems), Markus Neis	2019-11-12	2024-02-15	6ec820f2-e963-4801-9127-d8b2dce4d31b
	Detects suspicious user agent string of APT40 Dropbox tool	Emerging	test	proxy	-	-	Command and Control Application Layer Protocol Web Protocols Exfiltration Exfiltration Over Web Service Exfiltration to Cloud Storage	-	high	Thomas Patzke	2019-11-12	2023-05-18	5ba715b6-71b7-44fd-8245-f66893e81b3d
	Detects execution of GfxDownloadWrapper.exe with a URL as an argument to download file.	Generic	test	process_creation	windows	Sysmon · WinEventLog Security	Command and Control Ingress Tool Transfer	-	medium	Victor Sergeev, oscd.community	2020-10-09	2023-10-18	eee00933-a761-4cd0-be70-c42fe91731e7
Splunk	The following analytic identifiesGetPasswordData API calls in your AWS account. (...)	Anomaly	stable	cloud_audit	-	AWS CloudTrail · AWS	Credential Access Brute Force Password Guessing Resource Development Compromise Accounts Cloud Accounts	-	medium	Patrick Bareiss, Splunk	2022-08-10	2026-05-13	a79b607a-50cc-4704-bb9d-eff280cb78c2
	Detects spawning of suspicious child processes by Atlassian Confluence server which may indicate suc (...)	Emerging	test	process_creation	linux	Sysmon	Execution Command and Scripting Interpreter Initial Access Exploit Public-Facing Application	CVE-2022-26134	high	Nasreddine Bencherchali (Nextron Systems)	2022-06-03	—	7fb14105-530e-4e2e-8cfb-99f7d8700b66
	Detects automated lateral movement by Turla group	Unsupported	unsupported	process_creation	windows	Sysmon · WinEventLog Security	Execution Command and Scripting Interpreter Discovery File and Directory Discovery Discovery Network Share Discovery Lateral Movement Remote Services SMB/Windows Admin Shares	-	medium	Markus Neis	2017-11-07	2023-02-24	75925535-ca97-4e0a-a850-00b5c00779dc
Splunk	The following analytic identifies unsuccessful login attempts to the AWS Management Console using a specific user identity. (...)	Generic	stable	authentication	-	AWS CloudTrail · AWS	Credential Access Brute Force Password Guessing Resource Development Compromise Accounts Cloud Accounts	-	medium	Gowthamaraj Rajendran, Bhavin Patel, Splunk	2022-08-07	2026-05-13	a19b354d-0d7f-47f3-8ea6-1a7c36434968
Splunk	The following analytic identifies more than 10 GetPasswordData API calls within a 5-minute window in your AWS account. (...)	Anomaly	stable	authentication	-	AWS CloudTrail · AWS	Credential Access Brute Force Password Guessing Resource Development Compromise Accounts Cloud Accounts	-	medium	Bhavin Patel, Splunk	2022-08-10	2026-05-13	4d347c4a-306e-41db-8d10-b46baf71b3e2
	An attempt to export an AWS EC2 instance has been detected. (...)	Generic	test	cloud_audit	-	AWS CloudTrail · AWS	Collection Data from Local System Exfiltration Transfer Data to Cloud Account	-	low	Diogo Braz	2020-04-16	2022-10-05	54b9a76a-3c71-4673-b4b3-2edb4566ea7b
	Detects file creation events linked to the Axios NPM supply chain compromise. (...)	Emerging	experimental	file_event	linux	Sysmon	Command and Control Ingress Tool Transfer Initial Access Supply Chain Compromise Compromise Software Supply Chain	-	high	Swachchhanda Shrawan Poudel (Nextron Systems)	2026-04-01	—	b7cb840c-11f6-47f7-b3ef-5524739c9077
	Detects file creation events linked to the Axios NPM supply chain compromise on macOS devices. (...)	Emerging	experimental	file_event	macos	-	Command and Control Ingress Tool Transfer Initial Access Supply Chain Compromise Compromise Software Supply Chain	-	high	Swachchhanda Shrawan Poudel (Nextron Systems)	2026-04-01	—	2db0458c-05c9-4069-a26f-77becd9c8c13
	Detects the Linux-specific execution chain of the plain-crypto-js malicious npm dependency by Axios NPM package, including payload download via curl and detached execution using nohup and python3. (...)	Emerging	experimental	process_creation	linux	Sysmon	Execution Command and Scripting Interpreter Unix Shell Python Command and Control Ingress Tool Transfer Initial Access Supply Chain Compromise Compromise Software Supply Chain	-	high	Swachchhanda Shrawan Poudel (Nextron Systems)	2026-04-01	—	0a23a62d-c5b3-468b-a072-25064a9a8c87
	Detects the macOS-specific execution chain of the plain-crypto-js malicious npm dependency in Axios NPM Package, including AppleScript execution via osascript, payload download, permission modification, execution, and cleanup.	Emerging	experimental	process_creation	macos	-	Execution Command and Scripting Interpreter AppleScript Unix Shell Command and Control Ingress Tool Transfer Initial Access Supply Chain Compromise Compromise Software Supply Chain	-	high	Swachchhanda Shrawan Poudel (Nextron Systems)	2026-04-01	—	a09ee860-31b3-4586-8a68-0ebd74ce0e5f
	Detects the specific Windows execution chain and process tree associated with the Axios NPM supply chain compromise. (...)	Emerging	experimental	process_creation	windows	Sysmon · WinEventLog Security	Execution Command and Scripting Interpreter Windows Command Shell Visual Basic Command and Control Ingress Tool Transfer Initial Access Supply Chain Compromise Compromise Software Supply Chain	-	high	Swachchhanda Shrawan Poudel (Nextron Systems)	2026-04-01	—	f6c27ecc-d890-4452-80e6-2e274a10e097
	Detects DNS queries for the malicious C2 domain associated with the plain-crypto-js/Axios npm package supply chain compromise. (...)	Emerging	experimental	dns	-	-	Command and Control Application Layer Protocol Web Protocols Command and Control Dynamic Resolution	-	high	Swachchhanda Shrawan Poudel (Nextron Systems)	2026-04-01	—	73e5d24f-493f-4092-bd2f-c72cabda40ee
Splunk	The following analytic identifies an Azure AD account experiencing more than 20 failed authentication attempts within a 10-minute window. (...)	Generic	stable	authentication	-	Microsoft 365	Credential Access Brute Force Password Guessing	-	medium	Mauricio Velazco, Splunk	2023-01-23	2026-05-13	630b1694-210a-48ee-a450-6f79e7679f2c
Splunk	The following analytic detects an IP address with 20 or more failed authentication attempts to an Azure AD tenant within 10 minutes. (...)	Generic	stable	authentication	-	Microsoft 365	Credential Access Brute Force Password Guessing Password Spraying	-	medium	Mauricio Velazco, Bhavin Patel, Splunk	2023-01-23	2026-05-13	e5ab41bf-745d-4f72-a393-2611151afd8e
Splunk	The following analytic detects an Azure AD account successfully authenticating from multiple unique IP addresses within a 30-minute window. (...)	Generic	stable	authentication	-	Microsoft 365	Credential Access Brute Force Password Guessing Password Spraying	-	medium	Mauricio Velazco, Splunk	2023-01-24	2026-05-13	be6d868d-33b6-4aaa-912e-724fb555b11a
	Identifies when a new cloudshell is created inside of Azure portal.	Generic	test	cloud_audit	-	Azure Activity Logs · Azure	Execution Command and Scripting Interpreter	-	medium	Austin Songer	2021-09-21	2022-08-23	72af37e2-ec32-47dc-992b-bc288a2708cb
	Detects backup catalog deletions	Generic	test	-	windows	WinEventLog Application	Stealth Indicator Removal File Deletion	-	medium	Florian Roth (Nextron Systems), Tom U. @c_APT_ure (collection)	2017-05-12	2022-12-25	9703792d-fd9a-456d-a672-ff92efe4806a
	Detects usage of the "FromBase64String" function in the commandline which is used to decode a base64 (...)	Generic	test	process_creation	windows	Sysmon · WinEventLog Security	Execution Command and Scripting Interpreter PowerShell Stealth Deobfuscate/Decode Files or Information Stealth Obfuscated Files or Information	-	high	Florian Roth (Nextron Systems)	2020-01-29	2023-01-26	e32d4572-9826-4738-b651-95fa63747e8a
Splunk	The following analytic detects the use of `bitsadmin.exe` with the `transfer` parameter to download a remote object. (...)	Generic	stable	process_creation	windows	Sysmon · WinEventLog Security · CrowdStrike	Execution, Persistence, Stealth BITS Jobs Command and Control Ingress Tool Transfer	-	medium	Michael Haag, Sittikorn S	2021-03-30	2026-10-02	80630ff4-8e4c-11eb-aab5-acde48001122
	Detects Bitsadmin connections to IP addresses instead of FQDN names	Generic	test	proxy	-	-	Command and Control Application Layer Protocol Web Protocols Execution, Persistence, Stealth BITS Jobs	-	high	Florian Roth (Nextron Systems)	2022-06-10	2022-08-24	8ccd35a2-1c7c-468b-b568-ac6cdf80eec3
	Detects Bitsadmin connections to domains with uncommon TLDs	Generic	test	proxy	-	-	Command and Control Application Layer Protocol Web Protocols Execution, Persistence, Stealth BITS Jobs	-	high	Florian Roth (Nextron Systems), Tim Shelton	2019-03-07	2026-09-30	9eb68894-7476-4cd6-8752-23b51f5883a7
	Detects default file names outputted by the BloodHound collection tool SharpHound	Generic	test	file_event	windows	Sysmon	Discovery Account Discovery Local Account Domain Account Execution Command and Scripting Interpreter PowerShell Discovery Domain Trust Discovery Discovery Permission Groups Discovery Local Groups Domain Groups	-	high	C.J. May	2022-08-09	2026-02-19	02773bed-83bf-469f-b7ff-e676e7d78bab
	detects BPFDoor .lock and .pid files access in temporary file storage facility	Generic	test	file_event	linux	Linux Auditd	Execution Command and Scripting Interpreter Execution Native API	-	high	Rafal Piasecki	2022-08-10	2026-03-30	808146b2-9332-4d78-9416-d7e47012d83d
	Detects execution of Chromium based browser in headless mode	Generic	test	process_creation	windows	Sysmon · WinEventLog Security	Stealth Hide Artifacts Hidden Window Command and Control Ingress Tool Transfer	-	low	Nasreddine Bencherchali (Nextron Systems)	2023-09-12	—	ef9dcfed-690c-4c5d-a9d1-482cd422225c
	Detects usage of "getcap" binary. (...)	Generic	test	process_creation	linux	Sysmon	Discovery File and Directory Discovery	-	low	Nasreddine Bencherchali (Nextron Systems)	2022-12-28	2026-01-24	d8d97d51-122d-4cdd-9e2f-01b4b4933530
	Detects the use of the "capsh" utility to invoke a shell.	Generic	test	process_creation	linux	Sysmon	Execution Command and Scripting Interpreter	-	high	Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.)	2024-09-02	—	db1ac3be-f606-4e3a-89e0-9607cbe6b98a
	Detects the execution of the certutil with the "exportPFX" flag which allows the utility to export certificates.	Generic	test	process_creation	windows	Sysmon · WinEventLog Security	Stealth Obfuscated Files or Information	-	medium	Florian Roth (Nextron Systems), Jonhnathan Ribeiro, oscd.community, Nasreddine Bencherchali (Nextron Systems)	2023-02-15	2024-03-05	3ffd6f51-e6c1-47b7-94b4-c1e61d4117c5
	Detects a write of an Exchange CSR to an untypical directory or with aspx name suffix which can be u (...)	Generic	test	-	windows	Exchange	Persistence Server Software Component Web Shell	-	critical	Max Altgelt (Nextron Systems)	2021-08-23	2023-01-23	b7bc7038-638b-4ffd-880c-292c692209ef
Splunk	The following analytic detects the use of CertUtil.exe with the 'decode' argument, which may indicate an attempt to decode a previously encoded file, potentially containing malicious payloads. (...)	Generic	stable	process_creation	windows	Sysmon · WinEventLog Security · CrowdStrike	Stealth Deobfuscate/Decode Files or Information	-	medium	Michael Haag, Splunk	2021-03-25	2026-10-02	bfe94226-8c10-11eb-a4b3-acde48001122
	Detects HTTP request used by Chafer malware to receive data from its C2.	Emerging	test	proxy	-	-	Command and Control Application Layer Protocol Web Protocols	-	high	Florian Roth (Nextron Systems)	2019-01-31	2024-02-15	fb502828-2db0-438e-93e6-801c7548686d
	Adversaries may communicate using application layer protocols associated with web traffic to avoid detection/network filtering by blending in with existing traffic. (...)	Generic	test	ps_script	windows	PowerShell	Command and Control Application Layer Protocol Web Protocols	-	medium	frack113	2022-01-23	2025-07-18	d4488827-73af-4f8d-9244-7b7662ef046e
	Detects chmod targeting files in sensitive directory paths on Linux systems. (...)	Generic	test	process_creation	linux	Sysmon	Defense Impairment File and Directory Permissions Modification Linux and Mac Permissions	-	medium	Christopher Peacock @SecurePeacock, SCYTHE @scythe_io	2022-06-03	2026-03-18	6419afd1-3742-47a5-a7e6-b50386cd15f8
	Detects patterns found in process executions cause by China Chopper like tiny (ASPX) webshells	Generic	test	process_creation	windows	Sysmon · WinEventLog Security	Discovery Account Discovery Discovery Remote System Discovery Persistence Server Software Component Web Shell Discovery System Owner/User Discovery	CVE-2022-41040 CVE-2022-41082	high	Florian Roth (Nextron Systems), MSTI (query)	2022-10-01	—	fa3c117a-bc0d-416e-a31b-0c0e80653efb
Splunk	This analytic detects file copy activity on Cisco ASA devices via CLI or ASDM. (...)	Anomaly	stable	firewall	-	Cisco Secure Firewall · Cisco	Collection Data from Cloud Storage Collection Data from Local System	-	medium	Nasreddine Bencherchali, Splunk	2025-11-21	2026-05-13	4d7e8f3a-9c2b-4e6f-8a1d-5b9c7e2f4a8c
Splunk	This analytic detects file copy operations to remote locations on Cisco ASA devices via CLI or ASDM. (...)	Anomaly	stable	firewall	-	Cisco Secure Firewall · Cisco	Collection Data from Local System Exfiltration Exfiltration Over Alternative Protocol Exfiltration Over Unencrypted Non-C2 Protocol Exfiltration Exfiltration Over C2 Channel	-	medium	Nasreddine Bencherchali, Splunk	2025-11-21	2026-05-13	8a9e5f2b-6d4c-4e7f-9b3a-1c8d7f5e2a9b
Splunk	This analytic detects user account lockouts on Cisco ASA devices resulting from excessive failed authentication attempts. (...)	Anomaly	stable	firewall	-	Cisco Secure Firewall · Cisco	Credential Access Brute Force Password Guessing Password Spraying	-	medium	Nasreddine Bencherchali, Splunk	2025-11-21	2026-05-13	3e8f9c2a-6d4b-4a7e-9c5f-1b8d7e3a9f2c

Title

Description

P.A.S. Webshell S0598

P.A.S. Webshell S0598

P.A.S. Webshell MITRE reference S0598

Standing S0598

Reach

Coverage

P.A.S. Webshell detections S0598