S1039: Bumblebee

Bumblebee matters because ATT&CK describes it as a Windows C++ loader used to download and execute additional payloads, with links in reporting to ransomware operations and possible initial access broker activity. For leaders, the practical issue is not the loader name itself, but whether the organization can quickly prove which Windows hosts executed suspicious loaders, what follow-on payloads were fetched, what data may have been collected or exfiltrated, and whether ransomware-prevention controls would interrupt the chain.

Executive priority

Treat this as a validation case for ransomware readiness and incident triage on Windows endpoints. Ask whether SOC and IR teams can correlate endpoint execution, persistence, process injection, PowerShell/cmd/WMI use, scheduled tasks, registry queries, outbound web/C2 traffic, downloaded tools, file deletion, and potential data exfiltration into a single investigation timeline. This supports business continuity planning, audit evidence for endpoint monitoring, and prioritization of controls that reduce loader-to-ransomware escalation risk.

Technical view

ATT&CK provides no dedicated detection text for Bumblebee, so defenders should build coverage from the related behaviors: execution via PowerShell, Windows Command Shell, Visual Basic, WMI, Native API, and shared modules; persistence/execution through Scheduled Task; evasion through obfuscation, masquerading, process injection, DLL injection, APC injection, and file deletion; discovery through registry, process, user, and system information queries; and command-and-control through fallback channels, web services, ingress tool transfer, standard encoding, and exfiltration over C2. Because the malware object is Windows-scoped, prioritize Windows endpoint, identity, and network telemetry while avoiding assumptions about guaranteed detection from any single signal.

Likely telemetry

Windows endpoint process creation and command-line logs
PowerShell script block/module/transcription logs where enabled
WMI activity and remote/local execution telemetry
Scheduled task creation, modification, and execution events
Windows Registry query and modification telemetry

Detection direction

Validate correlation across loader-like execution followed by discovery, persistence, C2, tool transfer, and file deletion rather than relying on a single Bumblebee indicator.
Tune detections for suspicious use of PowerShell, cmd, WMI, scheduled tasks, and registry queries in user workstations where administrative or automation activity is uncommon.
Review process injection, DLL injection, APC injection, and unusual module-loading alerts with parent/child process context to reduce false positives from legitimate security and management tools.
Inspect outbound web service usage, fallback-channel behavior, encoded traffic, and downloads from Windows hosts, accounting for high noise from normal web and cloud-service traffic.
Ensure IR playbooks preserve volatile endpoint and network evidence because file deletion and obfuscation can reduce post-incident visibility.

Mitigation priorities

Prioritize endpoint hardening and monitoring on Windows systems, especially script interpreters, WMI, scheduled tasks, and unauthorized module execution.
Restrict and monitor administrative scripting and remote management paths with least privilege and strong identity controls.
Apply application control or allow-listing where operationally feasible to reduce unauthorized loaders, scripts, and shared-module execution.
Improve egress governance with proxy/DNS logging and policy controls so unusual web-service C2, fallback channels, and tool downloads are reviewable and containable.
Maintain ransomware-oriented IR readiness: rapid host isolation, payload scoping, credential review, backup validation, and evidence preservation.

Analyst notes and limits

The most useful defensive framing is loader behavior leading to follow-on payload execution. ATT&CK links Bumblebee to multiple techniques across execution, discovery, evasion, command-and-control, collection, and exfiltration, and notes reporting associations with ransomware operations and possible initial access broker use. Those relationships justify prioritizing it for ransomware-readiness validation, but local telemetry is required to determine exposure or incident impact.

Official ATT&CK detection guidance is not provided for this object, tactics are not specified on the malware object itself, and no aliases or labels are supplied. Platform support for the malware object is Windows; some related techniques list broader platforms, but that should not be treated as Bumblebee platform coverage. The supplied data does not prove current activity, attribution, exploitation against any organization, or guaranteed detection by any control.

Official MITRE ATT&CK definition

Bumblebee

Bumblebee is a custom loader written in C++ that has been used by multiple threat actors, including possible initial access brokers, to download and execute additional payloads since at least March 2022. Bumblebee has been linked to ransomware operations including Conti, Quantum, and Mountlocker and derived its name from the appearance of "bumblebee" in the user-agent.[1][2][3]

View the same entry on attack.mitre.org (MITRE-hosted reference; in-page links above use the Glexia ATT&CK library.)

Glexia analysis

How security teams should use this page

Treat this object as behavior context, not an attribution claim. Validate the related groups, software, data sources, and mitigations against official ATT&CK relationships and your own telemetry before making control-coverage decisions.

ATT&CK relationship table

Techniques used

This mirrors the MITRE pattern of making group, software, campaign, and technique relationships scannable. Relationship notes come from mirrored ATT&CK relationship text when available.

Filter related techniques 39 rows

Domain	ID	Name	Relationship / procedure
Enterprise	T1082	System Information Discovery	Bumblebee can enumerate the OS version and domain on a targeted system.[1][2][3]
Enterprise	T1033	System Owner/User Discovery	Bumblebee has the ability to identify the user name.[1]
Enterprise	T1047	Windows Management Instrumentation	Bumblebee can use WMI to gather system information and to spawn processes for code injection.[1][2]CitationCybereason Bumblebee August 2022
Enterprise	T1041	Exfiltration Over C2 Channel	Bumblebee can send collected data in JSON format to C2.[1]
Enterprise	T1059.003	Windows Command Shell Sub-technique	Bumblebee can use `cmd.exe` to drop and run files.[1][2]
Enterprise	T1497.001	System Checks Sub-technique	Bumblebee has the ability to search for designated file paths and Registry keys that indicate a virtualized environment from multiple products.CitationMedium Ali Salem Bumblebee April 2022
Enterprise	T1140	Deobfuscate/Decode Files or Information	Bumblebee can deobfuscate C2 server responses and unpack its code on targeted hosts.[2]CitationMedium Ali Salem Bumblebee April 2022
Enterprise	T1055.001	Dynamic-link Library Injection Sub-technique	The Bumblebee loader can support the `Dij` command which gives it the ability to inject DLLs into the memory of other processes.[2][3]
Enterprise	T1560	Archive Collected Data	Bumblebee can compress data stolen from the Registry and volume shadow copies prior to exfiltration.CitationCybereason Bumblebee August 2022
Enterprise	T1497.003	Time Based Checks Sub-technique	Bumblebee has the ability to set a hardcoded and randomized sleep interval.[2]
Enterprise	T1218.008	Odbcconf Sub-technique	Bumblebee can use `odbcconf.exe` to run DLLs on targeted hosts.CitationCybereason Bumblebee August 2022
Enterprise	T1005	Data from Local System	Bumblebee can capture and compress stolen credentials from the Registry and volume shadow copies.CitationCybereason Bumblebee August 2022
Enterprise	T1518.001	Security Software Discovery Sub-technique	Bumblebee can identify specific analytical tools based on running processes.[2][3]CitationMedium Ali Salem Bumblebee April 2022
Enterprise	T1055.004	Asynchronous Procedure Call Sub-technique	Bumblebee can use asynchronous procedure call (APC) injection to execute commands received from C2.[2]
Enterprise	T1059.005	Visual Basic Sub-technique	Bumblebee can create a Visual Basic script to enable persistence.[2][3]
Enterprise	T1102	Web Service	Bumblebee has been downloaded to victim's machines from OneDrive.[2]
Enterprise	T1497	Virtualization/Sandbox Evasion	Bumblebee has the ability to perform anti-virtualization checks.[2]
Enterprise	T1105	Ingress Tool Transfer	Bumblebee can download and execute additional payloads including through the use of a `Dex` command.[1][2][3]
Enterprise	T1008	Fallback Channels	Bumblebee can use backup C2 servers if the primary server fails.[2]
Enterprise	T1566.002	Spearphishing Link Sub-technique	Bumblebee has been spread through e-mail campaigns with malicious links.[2]CitationCybereason Bumblebee August 2022
Enterprise	T1132.001	Standard Encoding Sub-technique	Bumblebee has the ability to base64 encode C2 server responses.[2]
Enterprise	T1218.011	Rundll32 Sub-technique	Bumblebee has used `rundll32` for execution of the loader component.[2][3]
Enterprise	T1036.005	Match Legitimate Resource Name or Location Sub-technique	Bumblebee has named component DLLs "RapportGP.dll" to match those used by the security company Trusteer.CitationMedium Ali Salem Bumblebee April 2022
Enterprise	T1055	Process Injection	Bumblebee can inject code into multiple processes on infected endpoints.CitationCybereason Bumblebee August 2022
Enterprise	T1106	Native API	Bumblebee can use multiple Native APIs.[2]CitationMedium Ali Salem Bumblebee April 2022
Enterprise	T1027	Obfuscated Files or Information	Bumblebee has been delivered as password-protected zipped ISO files and used control-flow-flattening to obfuscate the flow of functions.[2]CitationCybereason Bumblebee August 2022CitationMedium Ali Salem Bumblebee April 2022
Enterprise	T1129	Shared Modules	Bumblebee can use `LoadLibrary` to attempt to execute GdiPlus.dll.CitationMedium Ali Salem Bumblebee April 2022
Enterprise	T1012	Query Registry	Bumblebee can check the Registry for specific keys.CitationMedium Ali Salem Bumblebee April 2022
Enterprise	T1573.001	Symmetric Cryptography Sub-technique	Bumblebee can encrypt C2 requests and responses with RC4[2]
Enterprise	T1548.002	Bypass User Account Control Sub-technique	Bumblebee has the ability to bypass UAC to deploy post exploitation tools with elevated privileges.CitationCybereason Bumblebee August 2022
Enterprise	T1057	Process Discovery	Bumblebee can identify processes associated with analytical tools.[2][3]CitationMedium Ali Salem Bumblebee April 2022
Enterprise	T1204.001	Malicious Link Sub-technique	Bumblebee has relied upon a user downloading a file from a OneDrive link for execution.[2]CitationCybereason Bumblebee August 2022
Enterprise	T1566.001	Spearphishing Attachment Sub-technique	Bumblebee has gained execution through luring users into opening malicious attachments.[2][3]CitationCybereason Bumblebee August 2022CitationMedium Ali Salem Bumblebee April 2022
Enterprise	T1053.005	Scheduled Task Sub-technique	Bumblebee can achieve persistence by copying its DLL to a subdirectory of %APPDATA% and creating a Visual Basic Script that will load the DLL via a scheduled task.[2][3]
Enterprise	T1204.002	Malicious File Sub-technique	Bumblebee has relied upon a user opening an ISO file to enable execution of malicious shortcut files and DLLs.[2][3]CitationCybereason Bumblebee August 2022CitationMedium Ali Salem Bumblebee April 2022
Enterprise	T1059.001	PowerShell Sub-technique	Bumblebee can use PowerShell for execution.CitationMedium Ali Salem Bumblebee April 2022
Enterprise	T1559.001	Component Object Model Sub-technique	Bumblebee can use a COM object to execute queries to gather system information.[2]
Enterprise	T1622	Debugger Evasion	Bumblebee can search for tools used in static analysis.CitationMedium Ali Salem Bumblebee April 2022
Enterprise	T1070.004	File Deletion Sub-technique	Bumblebee can uninstall its loader through the use of a `Sdl` command.[2]

Associated objects

Groups, software, and campaigns

G1038: TA578

TA578 is a threat actor that has used contact forms and email to initiate communications with victims and to distribute malware including Latrodectus, IcedID, and Bumblebee.[1][2]

G1011: EXOTIC LILY

EXOTIC LILY is a financially motivated group that has been closely linked with Wizard Spider and the deployment of ransomware including Conti and Diavol. EXOTIC LILY may be acting as an initial access broker for other malicious actors, and has targeted a wide range of industries including IT, cybersecurity, and healthcare since at least September 2021.[1]

Relationship explorer

All related ATT&CK context

Change history

Object version and sync metadata

The fields below describe the current mirrored snapshot. When Glexia retains multiple ATT&CK source imports, you can open the table to compare the same object across releases (hashes and MITRE timestamps). For MITRE’s own release notes and roadmap, see ATT&CK resources — Updates .

ATT&CK release: 19.1
Object version: 1.1
Created: Aug 19, 2022, 20:28 UTC (UTC+00:00)
Modified: Sep 17, 2024, 17:58 UTC (UTC+00:00)
Raw hash: 9abedb58ac1d9e8f...

Imported snapshots across ATT&CK releases (1)

Release	Bundle imported	Object version	Modified	Status	Raw hash
19.1	Jun 3, 2026, 07:54 UTC (UTC+00:00)	1.1	Sep 17, 2024, 17:58 UTC (UTC+00:00)	Current bundle	`9abedb58ac1d…`

Raw source

Mirrored ATT&CK source object

The raw object is retained through the mirrored ATT&CK source bundle and object hash. The raw endpoint returns the exact object from the mirrored bundle when available.

Open mirrored raw JSON Open MITRE-hosted copy

Source references

External references and citations

MITRE external references are preserved separately from Glexia analysis so citations remain traceable to their original source records.

[1]
Google EXOTIC LILY March 2022

Stolyarov, V. (2022, March 17). Exposing initial access broker with ties to Conti. Retrieved August 18, 2022.
Open source URL
[2]
Proofpoint Bumblebee April 2022

Merriman, K. and Trouerbach, P. (2022, April 28). This isn't Optimus Prime's Bumblebee but it's Still Transforming. Retrieved August 22, 2022.
Open source URL
[3]
Symantec Bumblebee June 2022

Kamble, V. (2022, June 28). Bumblebee: New Loader Rapidly Assuming Central Position in Cyber-crime Ecosystem. Retrieved August 24, 2022.
Open source URL
[4]
mitre-attack S1039
Open source URL

Source and licensing

Source: MITRE ATT&CK®. © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. MITRE ATT&CK and ATT&CK are registered trademarks of The MITRE Corporation. Glexia is not affiliated with or endorsed by MITRE.

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Analyst context for executives and security teams