General
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Target
https://cdn.fastly.steamstatic.com/client/installer/SteamSetup.exe
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Sample
250109-bc5pms1lg1
Static task
static1
URLScan task
urlscan1
Behavioral task
behavioral1
Sample
https://cdn.fastly.steamstatic.com/client/installer/SteamSetup.exe
Resource
win10v2004-20241007-en
windows10-2004-x64
30 signatures
900 seconds
Malware Config
Targets
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Target
https://cdn.fastly.steamstatic.com/client/installer/SteamSetup.exe
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Downloads MZ/PE file
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Checks computer location settings
Looks up country code configured in the registry, likely geofence.
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Executes dropped EXE
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Loads dropped DLL
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Adds Run key to start application
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Checks installed software on the system
Looks up Uninstall key entries in the registry to enumerate software on the system.
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Legitimate hosting services abused for malware hosting/C2
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Drops file in System32 directory
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MITRE ATT&CK Enterprise v15
Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Defense Evasion
Modify Registry
3Subvert Trust Controls
1Install Root Certificate
1