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MITRE ATT&CK® Technique

T1557: Adversary-in-the-Middle

Adversaries may attempt to position themselves between two or more networked devices using an adversary-in-the-middle (AiTM) technique to support follow-on behaviors such as Network Sniffing, Transmitted Data Manipulation, or replay attacks (Exploitation for Credential Access). By abusing features of common networking protocols that can determine the flow of network traffic (e.g. ARP, DNS, LLMNR, etc.), adversaries may force a device to communicate through an adversary controlled system so they can collect information or perform additional actions.[1]

For example, adversaries may manipulate victim DNS settings to enable other malicious activities such as preventing/redirecting users from accessing legitimate sites and/or pushing additional malware.[2][3][4] Adversaries may also manipulate DNS and leverage their position in order to intercept user credentials, including access tokens (Steal Application Access Token) and session cookies (Steal Web Session Cookie).[5][6] Downgrade Attacks can also be used to establish an AiTM position, such as by negotiating a less secure, deprecated, or weaker version of communication protocol (SSL/TLS) or encryption algorithm.[7][8][9]

Adversaries may also leverage the AiTM position to attempt to monitor and/or modify traffic, such as in Transmitted Data Manipulation. Adversaries can setup a position similar to AiTM to prevent traffic from flowing to the appropriate destination, potentially to impair defenses and/or in support of a Network Denial of Service.

EnterpriseT1557TechniqueObject v2.5Modified
Glexia's Take · Automated analysis

Security context for executives and security teams

Automation confidenceHigh

Adversary-in-the-Middle matters because it can turn ordinary network connectivity into a credential, token, session, or traffic-manipulation exposure. If an attacker can influence DNS, ARP, DHCP, name resolution, Wi-Fi, TLS negotiation, or similar traffic paths, they may collect information, redirect users, intercept credentials or access tokens, modify transmitted data, or disrupt traffic flows. For leaders, this is not only a network issue: it affects identity assurance, cloud/session security, SOC visibility, and the reliability of critical communications.

Executive priority

Prioritize this technique where business operations depend on trusted network paths, remote access, cloud identity sessions, Wi-Fi access, DNS integrity, or network devices. Executives should ask whether the organization can prove that sensitive traffic is encrypted, name resolution is controlled, legacy or weak protocols are reduced, and network changes are monitored. This is also relevant to audit and resilience discussions because AiTM can undermine authentication, data integrity, and incident scoping if telemetry is incomplete.

Technical view

ATT&CK lists this technique under credential access and collection across Linux, macOS, Windows, and network devices. Defensive validation should focus on whether teams can detect network and configuration anomalies associated with the related sub-techniques: Name Resolution Poisoning and SMB Relay, ARP Cache Poisoning, DHCP Spoofing, and Evil Twin. Since ATT&CK provides no official detection text for T1557, use the related detection strategy DET0296 as direction: validate visibility into network path changes, suspicious name resolution responses, unexpected DHCP behavior, ARP anomalies, Wi-Fi impersonation indicators, DNS manipulation, and TLS downgrade or weak-protocol negotiation where observable. IR teams should treat suspected AiTM as both a network investigation and an identity/session exposure assessment, especially where credentials, access tokens, or session cookies may have traversed the affected path.

Likely telemetry

  • DNS query/response logs, resolver configuration changes, and unexpected DNS redirection evidence
  • ARP table changes, duplicate IP/MAC observations, and local network switching telemetry where available
  • DHCP server, lease, option, and rogue DHCP indicators
  • LLMNR, NBT-NS, and mDNS traffic observations, especially on Windows segments
  • Wireless access point inventory, SSID/BSSID observations, and client association logs for Evil Twin scenarios

Detection direction

  • Map coverage by sub-technique rather than treating AiTM as one alert: Windows name-resolution abuse, ARP poisoning, DHCP spoofing, and Evil Twin require different sensors and baselines.
  • Validate that DET0296-style network and configuration anomaly detection is supported by actual telemetry, not assumed from endpoint logs alone.
  • Tune for environment-specific false positives such as legitimate network reconfiguration, DHCP failover, DNS migrations, proxy changes, wireless testing, or vulnerability assessments.
  • Correlate network anomalies with credential-access and collection outcomes, including suspicious authentication events after traffic redirection or token/session exposure concerns.
  • Review blind spots on unmanaged networks, guest Wi-Fi, remote sites, network devices, and segments where packet/flow visibility is limited.

Mitigation priorities

  • Start with encryption of sensitive information in transit and reduction of weak or deprecated protocol negotiation where feasible, aligning with M1041.
  • Reduce exploitable network paths through segmentation, traffic filtering, and restricted access to network resources, aligning with M1030, M1037, and M1035.
  • Use network intrusion prevention or detection signatures at appropriate boundaries where traffic patterns are observable, aligning with M1031.
  • Disable or remove unnecessary legacy features, services, or protocols that increase exposure to name-resolution, downgrade, or traffic-redirection abuse, aligning with M1042.
  • Include user training for reporting suspicious Wi-Fi, certificate warnings, unexpected redirects, or authentication prompts, aligning with M1017, but do not rely on training as the primary control.
Additional notes and limits

ATT&CK relationships show use by several groups, software, and a campaign, and identify specific sub-techniques that make this behavior operationally meaningful. The most useful defensive framing is coverage validation: can the organization see and investigate manipulation of traffic direction and name resolution before it becomes credential theft, token theft, data manipulation, or disruption? Network device and identity teams should be included in tabletop and detection-engineering work because AiTM can cross traditional SOC ownership boundaries.

The supplied ATT&CK object does not include official detection text, and the relationship descriptions are not sufficient to claim local exposure, active exploitation, or guaranteed detection. This take is based only on the provided ATT&CK fields, external references, and relationships. Actual priority depends on local network architecture, wireless use, identity provider/session controls, encryption posture, sensor placement, and retained logs.

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Official MITRE ATT&CK definition

Adversary-in-the-Middle

Adversaries may attempt to position themselves between two or more networked devices using an adversary-in-the-middle (AiTM) technique to support follow-on behaviors such as Network Sniffing, Transmitted Data Manipulation, or replay attacks (Exploitation for Credential Access). By abusing features of common networking protocols that can determine the flow of network traffic (e.g. ARP, DNS, LLMNR, etc.), adversaries may force a device to communicate through an adversary controlled system so they can collect information or perform additional actions.[1]

For example, adversaries may manipulate victim DNS settings to enable other malicious activities such as preventing/redirecting users from accessing legitimate sites and/or pushing additional malware.[2][3][4] Adversaries may also manipulate DNS and leverage their position in order to intercept user credentials, including access tokens (Steal Application Access Token) and session cookies (Steal Web Session Cookie).[5][6] Downgrade Attacks can also be used to establish an AiTM position, such as by negotiating a less secure, deprecated, or weaker version of communication protocol (SSL/TLS) or encryption algorithm.[7][8][9]

Adversaries may also leverage the AiTM position to attempt to monitor and/or modify traffic, such as in Transmitted Data Manipulation. Adversaries can setup a position similar to AiTM to prevent traffic from flowing to the appropriate destination, potentially to impair defenses and/or in support of a Network Denial of Service.

View the same entry on attack.mitre.org (MITRE-hosted reference; in-page links above use the Glexia ATT&CK library.)

Glexia analysis

How security teams should use this page

Treat this object as behavior context, not an attribution claim. Validate the related groups, software, data sources, and mitigations against official ATT&CK relationships and your own telemetry before making control-coverage decisions.

ATT&CK relationship table

Related techniques

This mirrors the MITRE pattern of making group, software, campaign, and technique relationships scannable. Relationship notes come from mirrored ATT&CK relationship text when available.

4 rows
DomainIDNameRelationship / procedure
EnterpriseT1557.003DHCP SpoofingSub-techniqueDHCP Spoofing subtechnique of this object.
EnterpriseT1557.002ARP Cache PoisoningSub-techniqueARP Cache Poisoning subtechnique of this object.
EnterpriseT1557.001Name Resolution Poisoning and SMB RelaySub-techniqueName Resolution Poisoning and SMB Relay subtechnique of this object.
EnterpriseT1557.004Evil TwinSub-techniqueEvil Twin subtechnique of this object.
Associated objects

Groups, software, and campaigns

GroupEnterprise

G0129: Mustang Panda

Mustang Panda is a China-based cyber espionage threat actor that has been conducting operations since at least 2012. Mustang Panda has been known to use tailored phishing lures and decoy documents to deliver malicious payloads. Mustang Panda has targeted government, diplomatic, and non-governmental organizations, including think tanks, religious institutions, and research entities, across the United States, Europe, and Asia, with notable activity in Russia, Mongolia, Myanmar, Pakistan, and Vietnam. [1][2][3][4][5][6][7][8][9][10][11][12][13]

GroupEnterprise

G0094: Kimsuky

Kimsuky is a Democratic People's Republic of Korea (DPRK)-based cyber espionage group that has been active since at least 2012. The group initially targeted South Korean government agencies, think tanks, and subject-matter experts in various fields. Its operations expanded to include the United Nations and organizations in the government, education, business services, and manufacturing sectors across the United States, Japan, Russia, and Europe. Kimsuky has focused collection on foreign policy and national security issues tied to the Korean Peninsula, nuclear policy, and sanctions. Kimsuky operations have overlapped with those of other North Korean state-sponsored cyber espionage actors as a result of ad hoc collaborations or other limited resource sharing.[1][2][3][4][5][6]

Kimsuky was assessed to be responsible for the 2014 Korea Hydro & Nuclear Power Co. compromise; other notable campaigns include Operation STOLEN PENCIL (2018), Operation Kabar Cobra (2019), and Operation Smoke Screen (2019).[7][8][9] In 2023, Kimsuky was observed using commercial large language models (LLMs) to assist with vulnerability research, scripting, social engineering and reconnaissance.[10]

DPRK threat actor cluster boundaries overlap in open source reporting, with some security researchers consolidating all attributed North Korean state-sponsored cyber activity under Lazarus Group, rather than tracking operationally distinct subgroups.

GroupEnterprise

G1041: Sea Turtle

Sea Turtle is a Türkiye-linked threat actor active since at least 2017 performing espionage and service provider compromise operations against victims in Asia, Europe, and North America. Sea Turtle is notable for targeting registrars managing ccTLDs and complex DNS-based intrusions where the threat actor compromised DNS providers to hijack DNS resolution for ultimate victims, enabling Sea Turtle to spoof log in portals and other applications for credential collection.[1][2][3][4]

ToolEnterprise

S9003: evilginx2

evilginx2 is an open-source adversary-in-the-middle (AiTM) attack framework based on the open-source nginx web server. evilginx2 can be used as a reverse proxy between victims and legitimate web services to intercept and capture credentials, authentication tokens, and session cookies.[1][2][3]

IaaSIdentity ProviderOffice Suite
ToolEnterprise

S1131: NPPSPY

NPPSPY is an implementation of a theoretical mechanism first presented in 2004 for capturing credentials submitted to a Windows system via a rogue Network Provider API item. NPPSPY captures credentials following submission and writes them to a file on the victim system for follow-on exfiltration.[1][2]

Windows
CampaignEnterprise

C0046: ArcaneDoor

ArcaneDoor is a campaign targeting networking devices from Cisco and other vendors between July 2023 and April 2024, primarily focused on government and critical infrastructure networks. ArcaneDoor is associated with the deployment of the custom backdoors Line Runner and Line Dancer. ArcaneDoor is attributed to a group referred to as UAT4356 or STORM-1849, and is assessed to be a state-sponsored campaign.[1][2]

Relationship explorer

All related ATT&CK context

Mitigations

Mitigation direction

Change history

Object version and sync metadata

The fields below describe the current mirrored snapshot. When Glexia retains multiple ATT&CK source imports, you can open the table to compare the same object across releases (hashes and MITRE timestamps). For MITRE’s own release notes and roadmap, see ATT&CK resources — Updates.

ATT&CK release
19.1
Object version
2.5
Created
Modified
Raw hash
0dd83b905042903e...
Imported snapshots across ATT&CK releases(1)
ReleaseBundle importedObject versionModifiedStatusRaw hash
19.12.5Current bundle0dd83b905042…
Raw source

Mirrored ATT&CK source object

The raw object is retained through the mirrored ATT&CK source bundle and object hash. The raw endpoint returns the exact object from the mirrored bundle when available.

Source references

External references and citations

MITRE external references are preserved separately from Glexia analysis so citations remain traceable to their original source records.

  1. [1]
    Rapid7 MiTM Basics

    Rapid7. (n.d.). Man-in-the-Middle (MITM) Attacks. Retrieved March 2, 2020.

    Open source URL
  2. [2]
    ttint_rat

    Tu, L. Ma, Y. Ye, G. (2020, October 1). Ttint: An IoT Remote Access Trojan spread through 2 0-day vulnerabilities. Retrieved October 28, 2021.

    Open source URL
  3. [3]
    dns_changer_trojans

    Abendan, O. (2012, June 14). How DNS Changer Trojans Direct Users to Threats. Retrieved October 28, 2021.

    Open source URL
  4. [4]
    ad_blocker_with_miner

    Kuzmenko, A.. (2021, March 10). Ad blocker with miner included. Retrieved October 28, 2021.

    Open source URL
  5. [5]
    volexity_0day_sophos_FW

    Adair, S., Lancaster, T., Volexity Threat Research. (2022, June 15). DriftingCloud: Zero-Day Sophos Firewall Exploitation and an Insidious Breach. Retrieved July 1, 2022.

    Open source URL
  6. [6]
    Token tactics

    Microsoft Incident Response. (2022, November 16). Token tactics: How to prevent, detect, and respond to cloud token theft. Retrieved December 26, 2023.

    Open source URL
  7. [7]
    mitm_tls_downgrade_att

    praetorian Editorial Team. (2014, August 19). Man-in-the-Middle TLS Protocol Downgrade Attack. Retrieved December 8, 2021.

    Open source URL
  8. [8]
    taxonomy_downgrade_att_tls

    Alashwali, E. S., Rasmussen, K. (2019, January 26). What's in a Downgrade? A Taxonomy of Downgrade Attacks in the TLS Protocol and Application Protocols Using TLS. Retrieved December 7, 2021.

    Open source URL
  9. [9]
    tlseminar_downgrade_att

    Team Cinnamon. (2017, February 3). Downgrade Attacks. Retrieved December 9, 2021.

    Open source URL
  10. [10]
    objsee mac malware 2017

    Patrick Wardle. (n.d.). Mac Malware of 2017. Retrieved September 21, 2018.

    Open source URL
  11. [11]
    CheckPoint Dok

    Ofer Caspi. (2017, May 4). OSX Malware is Catching Up, and it wants to Read Your HTTPS Traffic. Retrieved October 5, 2021.

    Open source URL
  12. [12]
    Google Threat Intelligence Group MUSTANG PANDA PLUGX August 2025

    Patrick Whitsell. (2025, August 25). Deception in Depth: PRC-Nexus Espionage Campaign Hijacks Web Traffic to Target Diplomats. Retrieved September 9, 2025.

    Open source URL
  13. [13]
    Evilginx 2 July 2018

    Gretzky, K.. (2018, July 26). Evilginx 2 - Next Generation of Phishing 2FA Tokens. Retrieved October 14, 2019.

    Open source URL
  14. [14]
    Breakdev Evilginx 3.0 May 2023

    Gretzky, K. (2023, May 10). Evilginx 3.0 + Evilginx Mastery. Retrieved January 27, 2026.

    Open source URL
  15. [15]
    Breakdev Evilginx 3.2 AUG 2023

    Gretzky, K. (2023, August 24). Evilginx 3.2 - Swimming With The Phishes. Retrieved January 27, 2026.

    Open source URL
  16. [16]
    Sophos Evilginx MAR 2025

    Everts, M. (2025, March 28). Stealing user credentials with evilginx. Retrieved January 27, 2026.

    Open source URL
  17. [17]
    CISA AA20-301A Kimsuky

    CISA, FBI, CNMF. (2020, October 27). https://us-cert.cisa.gov/ncas/alerts/aa20-301a. Retrieved November 4, 2020.

    Open source URL
  18. [18]
    Cisco ArcaneDoor 2024

    Cisco Talos. (2024, April 24). ArcaneDoor - New espionage-focused campaign found targeting perimeter network devices. Retrieved January 6, 2025.

    Open source URL
  19. [19]
    Huntress NPPSPY 2022

    Dray Agha. (2022, August 16). Cleartext Shenanigans: Gifting User Passwords to Adversaries With NPPSPY. Retrieved May 17, 2024.

    Open source URL
  20. [20]
    Talos Sea Turtle 2019

    Cisco Talos. (2019, April 17). Sea Turtle: DNS Hijacking Abuses Trust In Core Internet Service. Retrieved November 20, 2024.

    Open source URL
  21. [21]
    Talos Sea Turtle 2019_2

    Paul Rascagneres. (2019, July 9). Sea Turtle keeps on swimming, finds new victims, DNS hijacking techniques. Retrieved November 20, 2024.

    Open source URL
  22. [22]
    Rapid7 MiTM Basics

    Rapid7. (n.d.). Man-in-the-Middle (MITM) Attacks. Retrieved March 2, 2020.

    Open source URL
  23. [23]
    Rapid7 MiTM Basics

    Rapid7. (n.d.). Man-in-the-Middle (MITM) Attacks. Retrieved March 2, 2020.

    Open source URL
  24. [24]
    Token tactics

    Microsoft Incident Response. (2022, November 16). Token tactics: How to prevent, detect, and respond to cloud token theft. Retrieved December 26, 2023.

    Open source URL
  25. [25]
    Token tactics

    Microsoft Incident Response. (2022, November 16). Token tactics: How to prevent, detect, and respond to cloud token theft. Retrieved December 26, 2023.

    Open source URL
  26. [26]
    ad_blocker_with_miner

    Kuzmenko, A.. (2021, March 10). Ad blocker with miner included. Retrieved October 28, 2021.

    Open source URL
  27. [27]
    ad_blocker_with_miner

    Kuzmenko, A.. (2021, March 10). Ad blocker with miner included. Retrieved October 28, 2021.

    Open source URL
  28. [28]
    dns_changer_trojans

    Abendan, O. (2012, June 14). How DNS Changer Trojans Direct Users to Threats. Retrieved October 28, 2021.

    Open source URL
  29. [29]
    dns_changer_trojans

    Abendan, O. (2012, June 14). How DNS Changer Trojans Direct Users to Threats. Retrieved October 28, 2021.

    Open source URL
  30. [30]
    mitm_tls_downgrade_att

    praetorian Editorial Team. (2014, August 19). Man-in-the-Middle TLS Protocol Downgrade Attack. Retrieved December 8, 2021.

    Open source URL
  31. [31]
    mitm_tls_downgrade_att

    praetorian Editorial Team. (2014, August 19). Man-in-the-Middle TLS Protocol Downgrade Attack. Retrieved December 8, 2021.

    Open source URL
  32. [32]
    mitre-attackT1557
    Open source URL
  33. [33]
    mitre-attackT1557
    Open source URL
  34. [34]
    mitre-attackT1557
    Open source URL
  35. [35]
    taxonomy_downgrade_att_tls

    Alashwali, E. S., Rasmussen, K. (2019, January 26). What's in a Downgrade? A Taxonomy of Downgrade Attacks in the TLS Protocol and Application Protocols Using TLS. Retrieved December 7, 2021.

    Open source URL
  36. [36]
    taxonomy_downgrade_att_tls

    Alashwali, E. S., Rasmussen, K. (2019, January 26). What's in a Downgrade? A Taxonomy of Downgrade Attacks in the TLS Protocol and Application Protocols Using TLS. Retrieved December 7, 2021.

    Open source URL
  37. [37]
    tlseminar_downgrade_att

    Team Cinnamon. (2017, February 3). Downgrade Attacks. Retrieved December 9, 2021.

    Open source URL
  38. [38]
    tlseminar_downgrade_att

    Team Cinnamon. (2017, February 3). Downgrade Attacks. Retrieved December 9, 2021.

    Open source URL
  39. [39]
    ttint_rat

    Tu, L. Ma, Y. Ye, G. (2020, October 1). Ttint: An IoT Remote Access Trojan spread through 2 0-day vulnerabilities. Retrieved October 28, 2021.

    Open source URL
  40. [40]
    ttint_rat

    Tu, L. Ma, Y. Ye, G. (2020, October 1). Ttint: An IoT Remote Access Trojan spread through 2 0-day vulnerabilities. Retrieved October 28, 2021.

    Open source URL
  41. [41]
    volexity_0day_sophos_FW

    Adair, S., Lancaster, T., Volexity Threat Research. (2022, June 15). DriftingCloud: Zero-Day Sophos Firewall Exploitation and an Insidious Breach. Retrieved July 1, 2022.

    Open source URL
  42. [42]
    volexity_0day_sophos_FW

    Adair, S., Lancaster, T., Volexity Threat Research. (2022, June 15). DriftingCloud: Zero-Day Sophos Firewall Exploitation and an Insidious Breach. Retrieved July 1, 2022.

    Open source URL
  43. [43]
    CheckPoint Dok

    Ofer Caspi. (2017, May 4). OSX Malware is Catching Up, and it wants to Read Your HTTPS Traffic. Retrieved October 5, 2021.

    Open source URL
  44. [44]
    objsee mac malware 2017

    Patrick Wardle. (n.d.). Mac Malware of 2017. Retrieved September 21, 2018.

    Open source URL
  45. [45]
    Google Threat Intelligence Group MUSTANG PANDA PLUGX August 2025

    Patrick Whitsell. (2025, August 25). Deception in Depth: PRC-Nexus Espionage Campaign Hijacks Web Traffic to Target Diplomats. Retrieved September 9, 2025.

    Open source URL
  46. [46]
    Breakdev Evilginx 3.0 May 2023

    Gretzky, K. (2023, May 10). Evilginx 3.0 + Evilginx Mastery. Retrieved January 27, 2026.

    Open source URL
  47. [47]
    Breakdev Evilginx 3.2 AUG 2023

    Gretzky, K. (2023, August 24). Evilginx 3.2 - Swimming With The Phishes. Retrieved January 27, 2026.

    Open source URL
  48. [48]
    Evilginx 2 July 2018

    Gretzky, K.. (2018, July 26). Evilginx 2 - Next Generation of Phishing 2FA Tokens. Retrieved October 14, 2019.

    Open source URL
  49. [49]
    Sophos Evilginx MAR 2025

    Everts, M. (2025, March 28). Stealing user credentials with evilginx. Retrieved January 27, 2026.

    Open source URL
  50. [50]
    CISA AA20-301A Kimsuky

    CISA, FBI, CNMF. (2020, October 27). https://us-cert.cisa.gov/ncas/alerts/aa20-301a. Retrieved November 4, 2020.

    Open source URL
  51. [51]
    Cisco ArcaneDoor 2024

    Cisco Talos. (2024, April 24). ArcaneDoor - New espionage-focused campaign found targeting perimeter network devices. Retrieved January 6, 2025.

    Open source URL
  52. [52]
    Huntress NPPSPY 2022

    Dray Agha. (2022, August 16). Cleartext Shenanigans: Gifting User Passwords to Adversaries With NPPSPY. Retrieved May 17, 2024.

    Open source URL
  53. [53]
    Cisco ArcaneDoor 2024

    Cisco Talos. (2024, April 24). ArcaneDoor - New espionage-focused campaign found targeting perimeter network devices. Retrieved January 6, 2025.

    Open source URL
Source and licensing

Source: MITRE ATT&CK®. © 2026 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation. MITRE ATT&CK and ATT&CK are registered trademarks of The MITRE Corporation. Glexia is not affiliated with or endorsed by MITRE.