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PULSECHECK

PULSECHECK is a web shell written in Perl that was used by APT5 as early as 2020 including against Pulse Secure VPNs at US Defense Industrial Base (DIB) companies.[1]

ID: S1108
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Type: MALWARE
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Platforms: Network, Linux
Version: 1.0
Created: 08 February 2024
Last Modified: 10 April 2024
Enterprise Layer
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Techniques Used

Domain ID Name Use
Enterprise T1059 .004 命令与脚本解释器: Unix Shell

PULSECHECK can use Unix shell script for command execution.[1]
Enterprise T1071 .001 应用层协议: Web Protocols

PULSECHECK can check HTTP request headers for a specific backdoor key and if found will output the result of the command in the variable HTTP_X_CMD.[1]
Enterprise T1132 .001 数据编码: Standard Encoding

PULSECHECK can base-64 encode encrypted data sent through C2.[1]
Enterprise T1505 .003 服务器软件组件: Web Shell

PULSECHECK is a web shell that can enable command execution on compromised servers.[1]

Groups That Use This Software

ID Name References
G1023 APT5

[1]

References

  1. Perez, D. et al. (2021, April 20). Check Your Pulse: Suspected APT Actors Leverage Authentication Bypass Techniques and Pulse Secure Zero-Day. Retrieved February 5, 2024.