General
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Target
.
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Size
147KB
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Sample
240505-vez2qafc8w
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MD5
07c70cb8992bb928beedaef51f415b70
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SHA1
989e419cf2535041ea1083cdccbccc15d15082e0
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SHA256
91f02f293457b12fde79dddb793c2f1bce044af2ffab70ae67d2fa6e53a79de1
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SHA512
f1727d689656dbad05d748e21007f5dfc063e3c8ef3a568f7bb13d328dc23de4b853ebe07de94295ff8f61ec2ee1167b2a6fe5bcb6ff546079e59f371025b824
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SSDEEP
1536:ockaad8mvVqeK4DyxRR4Dpll0WlI130vD9328s4DDHhqiS:/k+ml6jUllvI4dHhqiS
Static task
static1
Behavioral task
behavioral1
Sample
.html
Resource
win10v2004-20240419-en
Malware Config
Extracted
crimsonrat
185.136.161.124
Targets
-
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Target
.
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Size
147KB
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MD5
07c70cb8992bb928beedaef51f415b70
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SHA1
989e419cf2535041ea1083cdccbccc15d15082e0
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SHA256
91f02f293457b12fde79dddb793c2f1bce044af2ffab70ae67d2fa6e53a79de1
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SHA512
f1727d689656dbad05d748e21007f5dfc063e3c8ef3a568f7bb13d328dc23de4b853ebe07de94295ff8f61ec2ee1167b2a6fe5bcb6ff546079e59f371025b824
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SSDEEP
1536:ockaad8mvVqeK4DyxRR4Dpll0WlI130vD9328s4DDHhqiS:/k+ml6jUllvI4dHhqiS
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CrimsonRAT main payload
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PrivateLoader
PrivateLoader is a downloader sold as a pay-per-install malware distribution service.
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Suspicious use of NtCreateProcessExOtherParentProcess
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Downloads MZ/PE file
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Drops file in Drivers directory
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Modifies Installed Components in the registry
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Sets file execution options in registry
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Sets service image path in registry
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Uses Session Manager for persistence
Creates Session Manager registry key to run executable early in system boot.
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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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Registers COM server for autorun
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Adds Run key to start application
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Checks for any installed AV software in registry
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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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Enumerates connected drives
Attempts to read the root path of hard drives other than the default C: drive.
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Legitimate hosting services abused for malware hosting/C2
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Writes to the Master Boot Record (MBR)
Bootkits write to the MBR to gain persistence at a level below the operating system.
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Checks system information in the registry
System information is often read in order to detect sandboxing environments.
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Drops file in System32 directory
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MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
6Registry Run Keys / Startup Folder
6Pre-OS Boot
1Bootkit
1Privilege Escalation
Boot or Logon Autostart Execution
6Registry Run Keys / Startup Folder
6Defense Evasion
Impair Defenses
1Disable or Modify Tools
1Modify Registry
7Pre-OS Boot
1Bootkit
1