Malware

CALENDAR

CALENDAR is malware that uses Google Calendar as its command-and-control channel, communicating through events in Google Calendar. The provided content also states that CALENDAR includes a command to run cmd.exe to execute commands on a compromised host. This indicates a design focused on blending C2 traffic with legitimate Google service activity while enabling command execution via the Windows command shell. No specific threat actor, infection vector, targeted industries, or indicators of compromise are provided in the available content.

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MITRE ATT&CK

Techniques & procedures

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

Execution

1 technique

T1059.003Windows Command ShellEvidence4

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.

Command and Control

2 techniques

T1102Web ServiceEvidence2

The adversaries had communicated to both Dropbox and Pastebin. APT28 has used Google Drive for C2. APT37 leverages social networking sites and cloud platforms (AOL, Twitter, Yandex, Mediafire, pCloud, Dropbox, and Box) for C2.

T1102.002Bidirectional CommunicationEvidence2

"APT39 has communicated with C2 through files uploaded to and downloaded from DropBox."; "RIFLESPINE can retrieve C2 commands from an encrypted file on Google Drive then upload the results ... back to Google Drive."; "CloudDuke uses a Microsoft OneDrive account to exchange commands and stolen data"

ACTIVITY FEED

Recent activity

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

3 SOURCESView more in app

mitre attack websiteNews

Oct 1, 2019

Web Service: Bidirectional Communication, Sub-technique T1102.002 - Enterprise | MITRE ATT&CK®

Malware that uses Google Calendar events as a covert command-and-control mechanism.

mitre attack websiteNews

Oct 1, 2019

Web Service: Bidirectional Communication, Sub-technique T1102.002 - Enterprise | MITRE ATT&CK®

Malware that communicates through Google Calendar events for command and control.

mitre attackNews

Jan 25, 2026

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

Malware/tool that can invoke cmd.exe to execute commands.

What this page doesn’t show

The version that knows your environment.

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IOC matching

Match every observed IP, domain, and hash against your live telemetry.

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 mapping3

Every documented technique, ranked by evidence weight.

Researcher chatter

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

CALENDAR