CSPY Downloader

CSPY Downloader is a tool designed to evade analysis and download additional payloads used by Kimsuky.[1]

ID: S0527
Type: TOOL
Platforms: Windows
Version: 1.0
Created: 09 November 2020
Last Modified: 18 October 2022

Techniques Used

Domain ID Name Use
Enterprise T1548 .002 Abuse Elevation Control Mechanism: Bypass User Account Control

CSPY Downloader can bypass UAC using the SilentCleanup task to execute the binary with elevated privileges.[1]

Enterprise T1071 .001 Application Layer Protocol: Web Protocols

CSPY Downloader can use GET requests to download additional payloads from C2.[1]

Enterprise T1070 Indicator Removal

CSPY Downloader has the ability to remove values it writes to the Registry.[1]

.004 File Deletion

CSPY Downloader has the ability to self delete.[1]

Enterprise T1105 Ingress Tool Transfer

CSPY Downloader can download additional tools to a compromised host.[1]

Enterprise T1036 .004 Masquerading: Masquerade Task or Service

CSPY Downloader has attempted to appear as a legitimate Windows service with a fake description claiming it is used to support packed applications.[1]

Enterprise T1112 Modify Registry

CSPY Downloader can write to the Registry under the %windir% variable to execute tasks.[1]

Enterprise T1027 .002 Obfuscated Files or Information: Software Packing

CSPY Downloader has been packed with UPX.[1]

Enterprise T1053 .005 Scheduled Task/Job: Scheduled Task

CSPY Downloader can use the schtasks utility to bypass UAC.[1]

Enterprise T1553 .002 Subvert Trust Controls: Code Signing

CSPY Downloader has come signed with revoked certificates.[1]

Enterprise T1204 .002 User Execution: Malicious File

CSPY Downloader has been delivered via malicious documents with embedded macros.[1]

Enterprise T1497 .001 Virtualization/Sandbox Evasion: System Checks

CSPY Downloader can search loaded modules, PEB structure, file paths, Registry keys, and memory to determine if it is being debugged or running in a virtual environment.[1]

Groups That Use This Software

ID Name References
G0094 Kimsuky