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Anchor

Anchor is one of a family of backdoor malware that has been used in conjunction with TrickBot on selected high profile targets since at least 2018.[1][2]

ID: S0504
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Associated Software: Anchor_DNS
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Type: MALWARE
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Platforms: Linux, Windows
Contributors: Cybereason Nocturnus, @nocturnus
Version: 1.0
Created: 10 September 2020
Last Modified: 15 December 2021

Associated Software Descriptions

Name Description
Anchor_DNS

[1][2]
Enterprise Layer
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Techniques Used

Domain ID Name Use
Enterprise T1071 .001 Application Layer Protocol: Web Protocols

Anchor has used HTTP and HTTPS in C2 communications.[1]
.004 Application Layer Protocol: DNS

Variants of Anchor can use DNS tunneling to communicate with C2.[1][2]
Enterprise T1059 .003 Command and Scripting Interpreter: Windows Command Shell

Anchor has used cmd.exe to run its self deletion routine.[1]
.004 Command and Scripting Interpreter: Unix Shell

Anchor can execute payloads via shell scripting.[2]
Enterprise T1543 .003 Create or Modify System Process: Windows Service

Anchor can establish persistence by creating a service.[1]

Enterprise T1480 Execution Guardrails

Anchor can terminate itself if specific execution flags are not present.[1]
Enterprise T1008 Fallback Channels

Anchor can use secondary C2 servers for communication after establishing connectivity and relaying victim information to primary C2 servers.[1]
Enterprise T1564 .004 Hide Artifacts: NTFS File Attributes

Anchor has used NTFS to hide files.[1]
Enterprise T1070 .004 Indicator Removal on Host: File Deletion

Anchor can self delete its dropper after the malware is successfully deployed.[1]
Enterprise T1105 Ingress Tool Transfer

Anchor can download additional payloads.[1][2]
Enterprise T1095 Non-Application Layer Protocol

Anchor has used ICMP in C2 communications.[1]
Enterprise T1027 Obfuscated Files or Information

Anchor has obfuscated code with stack strings and string encryption.[1]
.002 Software Packing

Anchor has come with a packed payload.[1]
Enterprise T1021 .002 Remote Services: SMB/Windows Admin Shares

Anchor can support windows execution via SMB shares.[2]
Enterprise T1053 .003 Scheduled Task/Job: Cron

Anchor can install itself as a cron job.[2]
.005 Scheduled Task/Job: Scheduled Task

Anchor can create a scheduled task for persistence.[1]
Enterprise T1553 .002 Subvert Trust Controls: Code Signing

Anchor has been signed with valid certificates to evade detection by security tools.[1]
Enterprise T1082 System Information Discovery

Anchor can determine the hostname and linux version on a compromised host.[2]
Enterprise T1016 System Network Configuration Discovery

Anchor can determine the public IP and location of a compromised host.[2]
Enterprise T1569 .002 System Services: Service Execution

Anchor can create and execute services to load its payload.[1][2]

References

  1. Dahan, A. et al. (2019, December 11). DROPPING ANCHOR: FROM A TRICKBOT INFECTION TO THE DISCOVERY OF THE ANCHOR MALWARE. Retrieved September 10, 2020.
  1. Grange, W. (2020, July 13). Anchor_dns malware goes cross platform. Retrieved September 10, 2020.