Skip to content

T1534 Internal Spearphishing

Adversaries may use internal spearphishing to gain access to additional information or exploit other users within the same organization after they already have access to accounts or systems within the environment. Internal spearphishing is multi-staged campaign where an email account is owned either by controlling the user’s device with previously installed malware or by compromising the account credentials of the user. Adversaries attempt to take advantage of a trusted internal account to increase the likelihood of tricking the target into falling for the phish attempt.1

Adversaries may leverage Spearphishing Attachment or Spearphishing Link as part of internal spearphishing to deliver a payload or redirect to an external site to capture credentials through Input Capture on sites that mimic email login interfaces.

There have been notable incidents where internal spearphishing has been used. The Eye Pyramid campaign used phishing emails with malicious attachments for lateral movement between victims, compromising nearly 18,000 email accounts in the process.1 The Syrian Electronic Army (SEA) compromised email accounts at the Financial Times (FT) to steal additional account credentials. Once FT learned of the campaign and began warning employees of the threat, the SEA sent phishing emails mimicking the Financial Times IT department and were able to compromise even more users.2

Item Value
ID T1534
Tactics TA0008
Platforms Google Workspace, Linux, Office 365, SaaS, Windows, macOS
Permissions required User
Version 1.2
Created 04 September 2019
Last Modified 08 March 2022

Procedure Examples

ID Name Description
G0047 Gamaredon Group Gamaredon Group has used an Outlook VBA module on infected systems to send phishing emails with malicious attachments to other employees within the organization.6
G1001 HEXANE HEXANE has conducted internal spearphishing attacks against executives, HR, and IT personnel to gain information and access.4
G0094 Kimsuky Kimsuky has sent internal spearphishing emails for lateral movement after stealing victim information.3
G0065 Leviathan Leviathan has conducted internal spearphishing within the victim’s environment for lateral movement.5
C0022 Operation Dream Job During Operation Dream Job, Lazarus Group conducted internal spearphishing from within a compromised organization.7


ID Data Source Data Component
DS0015 Application Log Application Log Content
DS0029 Network Traffic Network Traffic Content