malware

reGeorg S1187

Type: malware
Platforms: Network Devices, Windows, macOS, Linux
Created: 6 January 2025
Last modified: 15 April 2025

reGeorg is an open-source web shell written in Python that can be used as a proxy to bypass firewall rules and tunnel data in and out of targeted networks.[1][2]

Techniques47th pct

Tactics32nd pct

Threat groupsunranked

CampaignsNone recorded

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

reGeorg MITRE reference S1187

Remote Desktop Protocol T1021.001 ↗

reGeorg can be used to tunnel RDP connections.3

Lateral Movement33 detection rules

SMB/Windows Admin Shares T1021.002 ↗

reGeorg has the ability to tunnel SMB sessions.4

Lateral Movement54 detection rules

SSH T1021.004 ↗

reGeorg can communicate using SSH through an HTTP tunnel.5

Lateral Movement15 detection rules

Python T1059.006 ↗

reGeorg is a Python-based web shell.6

Execution15 detection rules

Web Protocols T1071.001 ↗

reGeorg can use HTTP to tunnel connections in and out of targeted networks.7

Command and Control60 detection rules

Proxy T1090 ↗

reGeorg can establish an HTTP or SOCKS proxy to tunnel data in and out of a network.8 9 10

Command and Control30 detection rules

Standing S1187

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.

Reach

Techniques1047th pct

47th percentile · 53% of 825 ATT&CK software entries have more Enterprise techniques.

Tactics432nd pct

32nd percentile · 68% of 825 ATT&CK software entries have more tactics spanned.

Threat groups361% tie · 22 values

61% of the population shares a single value across only 22 distinct values, so a percentile here would rank the tie, not the entity.

Campaigns085% tie · 8 values

85% of the population shares a single value across only 8 distinct values, so a percentile here would rank the tie, not the entity.

Coverage

Rules / technique35medTop 19%

81st percentile · 81% of 825 ATT&CK software entries have this many detection rules per technique or fewer.

Tests / technique4med28th pct

28th percentile · 72% of 825 ATT&CK software entries have more atomic tests per technique.

Data comps / technique5med54% tie · 11 values

54% of the population shares a single value across only 11 distinct values, so a percentile here would rank the tie, not the entity.

Mitigations / technique3medTop 3%

97th percentile · 97% of 825 ATT&CK software entries have this many mitigations per technique or fewer.

5 of 8 axes carry an honest rank on this page. Coverage medians are taken across this malware’s 10 Enterprise techniques.

Range

Technique Campaign use over its cumulative rule count.

Campaigns · 0Sigma rules (cumulative) · 271Splunk ESCU (cumulative) · 132

Standing S1187

Select	Description	Category	Status	Event	OS	Product	MITRE ATT&CK	CVEs	Severity	Author	Created	Updated	ID	Refs
	Detects access to ADMIN$ network share	Generic	test	network_connection	windows	WinEventLog Security	Lateral Movement Remote Services SMB/Windows Admin Shares	-	low	Florian Roth (Nextron Systems)	2017-03-04	2024-01-16	098d7118-55bc-4912-a836-dc6483a8d150
Splunk	The following analytic detects suspicious modifications to firewall rule registry settings that allow inbound traffic on specific ports with a public profile. (...)	Generic	stable	registry_event	windows	Sysmon	Lateral Movement Remote Services Remote Desktop Protocol	-	medium	Teoderick Contreras, Splunk, Steven Dick	2021-05-26	2026-05-13	0a46537c-be02-11eb-92ca-acde48001122
Splunk	The following analytic detects a suspicious PowerShell command that allows inbound traffic to a specific local port within the public profile. (...)	Generic	stable	ps_script	windows	PowerShell	Lateral Movement Remote Services Remote Desktop Protocol	-	medium	Teoderick Contreras, Splunk	2021-05-19	2026-05-13	a5d85486-b89c-11eb-8267-acde48001122
	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 when AppLocker "Audit only" enforcement mode reports that an Application, DLL, Script, MSI, or Packaged-App would have been blocked if AppLocker "Enforce rules" enforcement mode was enabled.	Generic	experimental	-	windows	AppLocker	Execution Command and Scripting Interpreter PowerShell Windows Command Shell Visual Basic Python Execution User Execution Malicious File	-	medium	heyyanu	2026-03-26	—	557e3bd3-7f21-495d-8d50-7c8bdfb8041c
	Detects when AppLocker prevents the execution of an Application, DLL, Script, MSI, or Packaged-App from running.	Generic	test	-	windows	AppLocker	Execution Command and Scripting Interpreter PowerShell Windows Command Shell Visual Basic Python Execution User Execution Malicious File	-	medium	Pushkarev Dmitry	2020-06-28	2025-12-03	401e5d00-b944-11ea-8f9a-00163ecd60ae
	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
	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
	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
	Detects Bitbucket global SSH access configuration changes.	Generic	test	cloud_audit	-	Bitbucket Audit · Bitbucket	Defense Impairment Disable or Modify Tools Lateral Movement Remote Services SSH	-	medium	Muhammad Faisal (@faisalusuf)	2024-02-25	—	16ab6143-510a-44e2-a615-bdb80b8317fc
	Detects SSH user login access failures. (...)	Generic	test	cloud_audit	-	Bitbucket Audit · Bitbucket	Credential Access Brute Force Lateral Movement Remote Services SSH	-	medium	Muhammad Faisal (@faisalusuf)	2024-02-25	—	d3f90469-fb05-42ce-b67d-0fded91bbef3
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 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 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
	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 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 provides comprehensive monitoring of configuration changes on Cisco devices by analyzing archive logs. (...)	Hunting	stable	configuration_change	-	Cisco IOS · Cisco	Persistence, Privilege Escalation Account Manipulation Defense Impairment Disable or Modify Tools Persistence Server Software Component Web Shell	CVE-2018-0171	medium	Bhavin Patel, Michael Haag, Splunk	2025-08-21	2026-05-13	f52d5c0b-d45d-4304-b300-a4f6a1130dec
Splunk	This analytic detects bursts of ping, SSH, and Telnet commands issued from Cisco IOS or NX-OS devices. (...)	Anomaly	stable	network_device	-	Cisco IOS · Cisco	Discovery Network Service Discovery Lateral Movement Remote Services SSH Discovery Remote System Discovery	-	medium	Nasreddine Bencherchali	2026-05-19	2026-05-20	efb20922-17bc-4fb0-880c-be50cfc100dd
Splunk	This analytic detects creation of a Cisco IOS-XE tunnel interface with tunnel source, tunnel destination, and an IP address in the 10.10.12.0 network. (...)	Anomaly	stable	network_device	-	Cisco IOS · Cisco	Command and Control Protocol Tunneling Command and Control Proxy	-	medium	Nasreddine Bencherchali	2026-05-19	2026-05-20	8654314d-8e4d-4971-9f35-b9d477bf668e
Splunk	The following analytic detects the execution of curl commands with insecure flags within the Cisco Isovalent environment. (...)	Anomaly	stable	process_creation	-	Cisco	Command and Control Ingress Tool Transfer	-	medium	Bhavin Patel, Splunk	2026-01-05	2026-10-02	c16c4899-d3f7-461b-92c2-cc0ef5758855
Splunk	This analytic detects the usage of the Utility osascript on a macOS device initiated a network connection lasting longer than 10 minutes (600 seconds). (...)	Anomaly	stable	network_connection	-	Cisco NVM · Cisco	Command and Control Application Layer Protocol Web Protocols Execution Command and Scripting Interpreter AppleScript	-	medium	Radka Viskova, Splunk	2026-09-18	2026-09-22	6bc88a9d-f7de-4257-b526-acf15bc5a517
Splunk	This analytic identifies the use of Chromium-based browsers (like Microsoft Edge) running in headless mode with the `--dump-dom` argument. (...)	Generic	stable	network_connection	-	Cisco NVM · Cisco	Execution Command and Scripting Interpreter Command and Control Ingress Tool Transfer	-	medium	Nasreddine Bencherchali, Splunk	2025-07-01	2026-09-22	cd0e816f-f67d-4dbe-a153-480b546e867e
Splunk	This analytic detects unexpected outbound network connections initiated by known webserver processes such as `httpd.exe`, `nginx.exe`, or `tomcat.exe` to common file sharing or public content hosting services like GitHub, Discord CDN, Transfer.sh, or Pastebin. (...)	Generic	stable	network_connection	-	Cisco NVM · Cisco	Initial Access Exploit Public-Facing Application Command and Control Ingress Tool Transfer	-	medium	Nasreddine Bencherchali, Splunk	2025-07-01	2026-09-22	1984f997-3b49-4d4b-a7e9-dc5dbf88370e
Splunk	This analytic correlates risk events between privileged account creation on Cisco IOS devices and HTTP requests to privileged execution paths such as `/level/15/exec/-/*`. (...)	Correlation	stable	-	-	Cisco	Persistence Create Account Lateral Movement Remote Services SSH Initial Access, Persistence, Privilege Escalation, Stealth Valid Accounts	-	medium	Nasreddine Bencherchali, Splunk	2026-01-12	2026-05-13	2c9d4f5a-8b6e-4c7f-9d8e-1a2b3c4d5e6f
Splunk	This analytic detects a correlation between privileged account creation on Cisco IOS devices and sub (...)	Correlation	stable	-	-	Cisco	Persistence Create Account Lateral Movement Remote Services SSH Initial Access, Persistence, Privilege Escalation, Stealth Valid Accounts	-	medium	Nasreddine Bencherchali, Splunk	2026-01-12	2026-05-13	7f8e2b4c-9a3d-4e1f-8c5b-6d7e8f9a0b1c
Splunk	The following analytic detects the use of known suspicious SSL certificates in any observed event where the SSL_CertFingerprint field is present. (...)	Generic	stable	firewall	-	Cisco Secure Firewall · Cisco	Command and Control Application Layer Protocol Web Protocols Resource Development Develop Capabilities Code Signing Certificates Command and Control Encrypted Channel Asymmetric Cryptography Resource Development Obtain Capabilities Digital Certificates	-	medium	Nasreddine Bencherchali, Splunk	2025-04-03	2026-09-22	c43f7b49-2dab-4e76-892e-7f971c2f20f1
Splunk	The following analytic detects potential reverse shell activity by identifying connections involving ports commonly associated with remote access tools, shell listeners, or tunneling utilities. (...)	Anomaly	stable	firewall	-	Cisco Secure Firewall · Cisco	Execution Command and Scripting Interpreter PowerShell Command and Control Ingress Tool Transfer Command and Control Non-Standard Port Privilege Escalation, Stealth Process Injection Command and Control Remote Access Tools Lateral Movement Remote Services	-	medium	Nasreddine Bencherchali, Splunk	2025-04-03	2026-05-13	d85c05c8-42c0-4e4a-87e7-4e1bb3e844e3
Splunk	The following analytic detects outbound connections to commonly abused file sharing and pastebin-style hosting domains. (...)	Anomaly	stable	firewall	-	Cisco Secure Firewall · Cisco	Command and Control Application Layer Protocol Web Protocols Exfiltration Exfiltration Over Web Service Exfiltration to Cloud Storage Command and Control Ingress Tool Transfer Resource Development Obtain Capabilities Tool Command and Control Proxy External Proxy	-	medium	Nasreddine Bencherchali, Splunk	2025-04-03	2026-05-13	f7e5e792-d907-46c1-a58e-4ff974dc462a
Splunk	The following analytic detects file transfers flagged as malware that occurred over non-standard ports (other than 80 and 443). (...)	Anomaly	stable	firewall	-	Cisco Secure Firewall · Cisco	Command and Control Ingress Tool Transfer Command and Control Non-Standard Port	-	medium	Nasreddine Bencherchali, Splunk	2025-04-09	2026-09-22	f26445a8-a6a2-4855-bec0-0c39e52e5b8f
Splunk	The following analytic detects connections with a high Encrypted Visibility Engine (EVE) threat confidence score, indicating potentially malicious behavior within encrypted traffic. (...)	Anomaly	stable	firewall	-	Cisco Secure Firewall · Cisco	Command and Control Application Layer Protocol Web Protocols Command and Control Encrypted Channel Asymmetric Cryptography Exfiltration Exfiltration Over C2 Channel Command and Control Ingress Tool Transfer	-	medium	Nasreddine Bencherchali, Splunk	2025-04-03	2026-05-13	8c15183e-2e70-4db4-86c3-88f8d9129b66
Splunk	The following analytic detects file downloads that were classified as malware by Cisco Secure Firewall Threat Defense. (...)	Anomaly	stable	firewall	-	Cisco Secure Firewall · Cisco	Execution Exploitation for Client Execution Command and Control Ingress Tool Transfer	-	medium	Nasreddine Bencherchali, Splunk	2025-04-09	2026-09-22	3cc93f52-5aa6-4b7f-83b9-3430b1436813
Splunk	This analytic detects HTTP requests to privileged execution paths on Cisco routers, specifically targeting the `/level/15/exec/-/*` endpoint using Cisco Secure Firewall Intrusion Events. (...)	Anomaly	stable	firewall	-	Cisco Secure Firewall · Cisco	Execution Command and Scripting Interpreter Persistence Server Software Component Web Shell	-	medium	Nasreddine Bencherchali, Michael Haag, Splunk	2026-01-12	2026-05-13	0c1d2e3f-4a5b-6c7d-8e9f-0a1b2c3d4e5f
Splunk	The following analytic detects repeated malware file downloads initiated by the same internal host (src) within a short time window. (...)	Anomaly	stable	firewall	-	Cisco Secure Firewall · Cisco	Command and Control Ingress Tool Transfer Stealth Obfuscated Files or Information	-	medium	Nasreddine Bencherchali, Splunk	2025-04-09	2026-09-22	aeff2bb5-3483-48d4-9be8-c8976194be1e
Splunk	This analytic identifies Snort intrusion signatures that have been triggered by ten or more distinct internal IP addresses within a one-hour window. (...)	Anomaly	stable	firewall	-	Cisco Secure Firewall · Cisco	Command and Control Ingress Tool Transfer Stealth Obfuscated Files or Information	-	medium	Nasreddine Bencherchali, Splunk	2025-04-16	2026-05-13	a4c76d0a-56b6-44be-814b-939746c4d406
Splunk	This analytic detects inbound SSH connections to non-standard ports on network devices using Cisco Secure Firewall Intrusion Events. (...)	Anomaly	stable	firewall	-	Cisco Secure Firewall · Cisco	Lateral Movement Remote Services SSH	-	medium	Nasreddine Bencherchali, Michael Haag, Splunk	2026-01-12	2026-05-13	9b0c2d3e-4f5a-6b7c-8d9e-0f1a2b3c4d5e
Splunk	This analytic detects inbound SSH connections to the sshd_operns service on network devices using Cisco Secure Firewall Intrusion Events. (...)	Anomaly	stable	firewall	-	Cisco Secure Firewall · Cisco	Lateral Movement Remote Services SSH	-	medium	Nasreddine Bencherchali, Splunk	2026-01-12	2026-05-13	8a9c1d2e-3f4b-5c6d-7e8f-9a0b1c2d3e4f
Splunk	The following analytic detects outbound connections initiated by command-line tools such as curl or wget. (...)	Anomaly	stable	firewall	-	Cisco Secure Firewall · Cisco	Command and Control Application Layer Protocol Web Protocols Execution Command and Scripting Interpreter Command and Control Ingress Tool Transfer Execution, Persistence, Privilege Escalation Scheduled Task/Job Cron	-	medium	Nasreddine Bencherchali, Splunk	2025-04-03	2026-05-13	173a1cb9-1814-4128-a9dc-f29dade89957
	Various protocols maybe used to put data on the device for exfil or infil	Generic	test	authentication	-	Cisco AAA · Cisco	Collection Archive Collected Data Archive via Utility Collection Data Staged Command and Control Ingress Tool Transfer	-	low	Austin Clark	2019-08-12	2023-01-04	5e51acb2-bcbe-435b-99c6-0e3cd5e2aa59	-
	Detects execution of the "cloudflared" tool with the tunnel "cleanup" flag in order to cleanup tunnel connections.	Generic	test	process_creation	windows	Sysmon · WinEventLog Security	Command and Control Protocol Tunneling Command and Control Proxy Command and Control Web Service	-	medium	Nasreddine Bencherchali (Nextron Systems)	2023-05-17	2023-12-21	7050bba1-1aed-454e-8f73-3f46f09ce56a