Malware

WEBC2

WEBC2 is a Windows backdoor associated with APT1 activity. It has been documented in multiple variants and is notable for providing interactive command shell access on compromised systems, enabling remote command execution as a post-compromise capability. WEBC2 variants have also used DLL search order hijacking for persistence, including placement of a malicious library in a location that causes it to be loaded by the operating system during normal execution. The malware is commonly discussed in the context of long-term intrusion operations and malware-family clustering, including import-hash-based tracking of related samples and variants. High-confidence reporting supports WEBC2 as a Windows-focused backdoor used in targeted intrusions rather than commodity crimeware.

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MITRE ATT&CK

Techniques & procedures

5 distinct techniques documented for this family, organized by ATT&CK tactic.

Execution

2 techniques

T1059.003Windows Command ShellEvidence4

Numerous entries state malware can create a remote shell or reverse shell, for example 4H RAT, BLACKCOFFEE, DarkComet, PlugX, QuasarRAT, and others. | The content repeatedly describes threat actors and malware using cmd.exe, the Windows command shell, to execute commands, launch payloads, run batch files, and automate actions on compromised hosts.

T1574.001DLLEvidence3

APT41 has used search order hijacking to execute malicious payloads, such as Winnti for Windows. Aquatic Panda has used DLL search-order hijacking to load exe, dll, and dat files into memory. Astaroth can launch itself via DLL Search Order Hijacking.

Stealth

1 technique

T1574.001DLLEvidence3

Command and Control

3 techniques

T1071.001Web ProtocolsEvidence1

"HTTPBrowser"; "httpclient"; "WEBC2"

T1105Ingress Tool TransferEvidence2

The content repeatedly describes malware and threat actors that can "download files from C2," "download additional payloads," "upload and download files," "retrieve payloads from the C2 server," and "copy files to remote machines."

T1219Remote Access ToolsEvidence1

4H RAT has the capability to create a remote shell. AuditCred can open a reverse shell on the system to execute commands. PlugX allows actors to spawn a reverse shell on a victim. QuasarRAT can launch a remote shell to execute commands on the victim’s machine.

ACTIVITY FEED

Recent activity

5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

5 SOURCESView more in app

mitre attack websiteNews

May 1, 2016

Hijack Execution Flow: DLL, Sub-technique T1574.001 - Enterprise | MITRE ATT&CK®

Backdoor malware whose variants persist via DLL search order hijacking.

mitre attackNews

Jan 25, 2026

Command and Scripting Interpreter: Windows Command Shell, Sub-technique T1059.003 - Enterprise | MITRE ATT&CK®

Malware/tool capable of opening an interactive command shell.

mitre attack websiteNews

Feb 3, 2026

Hijack Execution Flow: DLL, Sub-technique T1574.001 - Enterprise | MITRE ATT&CK®

Persistence via DLL search-order hijacking (e.g., planting ntshrui.dll).

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IOC matching

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Threat actor attribution

Named campaigns wielding this family, with evidence pinned to each claim.

Exploited vulnerabilities

CVEs this family uses for access and lateral movement.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

MITRE ATT&CK mapping5

Every documented technique, ranked by evidence weight.

Researcher chatter

Reddit, Mastodon, and CTI community discussion around this family.

WEBC2