General
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Target
3b7485ad0c468862f394dd4d1dd0448382020431ba01760b0745e3c256926d0a
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Size
230KB
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Sample
231208-vr8vdsbcfp
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MD5
f047d4dd986b3dc6f374f56dcfc60c6a
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SHA1
b65b66ae8a9a76a7e2546f608d40ddede15954af
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SHA256
3b7485ad0c468862f394dd4d1dd0448382020431ba01760b0745e3c256926d0a
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SHA512
aa04c9ca14b5a791343af6e74b266f70e711e6b78d9037f7e53c198ed244aa681e456df0bcb02e0d11f65530ca4ecf22105e29b74fd36b08439ae1753a9639ab
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SSDEEP
3072:dYbOTP4PXcLEiCZdpuoFOUeGpSx0lnwJ7XgRNUL0oGiWHCK:LTPaXmcyoFOGzwVABH
Static task
static1
Behavioral task
behavioral1
Sample
3b7485ad0c468862f394dd4d1dd0448382020431ba01760b0745e3c256926d0a.exe
Resource
win10v2004-20231130-en
Malware Config
Extracted
smokeloader
up3
Extracted
smokeloader
2020
http://host-file-host6.com/
http://host-host-file8.com/
Extracted
djvu
http://zexeq.com/test1/get.php
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extension
.nbzi
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offline_id
csCsb6cUvy0iMa6NgGCGH0hSfXQlGjZVEmFVkgt1
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payload_url
http://brusuax.com/dl/build2.exe
http://zexeq.com/files/1/build3.exe
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ransomnote
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Targets
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Target
3b7485ad0c468862f394dd4d1dd0448382020431ba01760b0745e3c256926d0a
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Size
230KB
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MD5
f047d4dd986b3dc6f374f56dcfc60c6a
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SHA1
b65b66ae8a9a76a7e2546f608d40ddede15954af
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SHA256
3b7485ad0c468862f394dd4d1dd0448382020431ba01760b0745e3c256926d0a
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SHA512
aa04c9ca14b5a791343af6e74b266f70e711e6b78d9037f7e53c198ed244aa681e456df0bcb02e0d11f65530ca4ecf22105e29b74fd36b08439ae1753a9639ab
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SSDEEP
3072:dYbOTP4PXcLEiCZdpuoFOUeGpSx0lnwJ7XgRNUL0oGiWHCK:LTPaXmcyoFOGzwVABH
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DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
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Detect ZGRat V1
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Detected Djvu ransomware
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Identifies VirtualBox via ACPI registry values (likely anti-VM)
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Downloads MZ/PE file
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Checks BIOS information in registry
BIOS information is often read in order to detect sandboxing environments.
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Checks computer location settings
Looks up country code configured in the registry, likely geofence.
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Deletes itself
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Drops startup file
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Executes dropped EXE
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Modifies file permissions
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Adds Run key to start application
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Looks up external IP address via web service
Uses a legitimate IP lookup service to find the infected system's external IP.
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Drops file in System32 directory
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Suspicious use of NtSetInformationThreadHideFromDebugger
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Suspicious use of SetThreadContext
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MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Privilege Escalation
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Defense Evasion
File and Directory Permissions Modification
1Modify Registry
1Virtualization/Sandbox Evasion
1