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.(Citation: Trend Micro When Phishing Starts from the Inside 2017) 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.(Citation: Trend Micro When Phishing Starts from the Inside 2017) 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.(Citation: THE FINANCIAL TIMES LTD 2019.)
Procedure Examples |
|
Name | Description |
---|---|
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.(Citation: ESET Gamaredon June 2020) |
Kimsuky |
Kimsuky has sent internal spearphishing emails for lateral movement after stealing victim information.(Citation: KISA Operation Muzabi) |
Lazarus Group |
Lazarus Group has conducted internal spearphishing from within a compromised organization.(Citation: ClearSky Lazarus Aug 2020) |
Leviathan |
Leviathan has conducted internal spearphishing within the victim's environment for lateral movement.(Citation: CISA AA21-200A APT40 July 2021) |
HEXANE |
HEXANE has conducted internal spearphishing attacks against executives, HR, and IT personnel to gain information and access.(Citation: SecureWorks August 2019) |
Detection
Network intrusion detection systems and email gateways usually do not scan internal email, but an organization can leverage the journaling-based solution which sends a copy of emails to a security service for offline analysis or incorporate service-integrated solutions using on-premise or API-based integrations to help detect internal spearphishing campaigns.(Citation: Trend Micro When Phishing Starts from the Inside 2017)
References
- THE FINANCIAL TIMES. (2019, September 2). A sobering day. Retrieved October 8, 2019.
- Chris Taylor. (2017, October 5). When Phishing Starts from the Inside. Retrieved October 8, 2019.
- ClearSky Research Team. (2020, August 13). Operation 'Dream Job' Widespread North Korean Espionage Campaign. Retrieved December 20, 2021.
- SecureWorks 2019, August 27 LYCEUM Takes Center Stage in Middle East Campaign Retrieved. 2019/11/19
- Boutin, J. (2020, June 11). Gamaredon group grows its game. Retrieved June 16, 2020.
- CISA. (2021, July 19). (AA21-200A) Joint Cybersecurity Advisory – Tactics, Techniques, and Procedures of Indicted APT40 Actors Associated with China’s MSS Hainan State Security Department. Retrieved August 12, 2021.
- KISA. (n.d.). Phishing Target Reconnaissance and Attack Resource Analysis Operation Muzabi. Retrieved March 7, 2022.
Связанные риски
Риск | Связи | |
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Боковое перемещение злоумышленника по локальной сети из-за
реагирования на мошеннические, фишинговые письма и сообщения у работника
Конфиденциальность
Целостность
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Каталоги
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