General
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Target
AtomClient.exe
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Size
2.3MB
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Sample
240715-ks8wns1crg
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MD5
a9dd17ba223ce69553957c20f4c9ca74
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SHA1
61d11d0b938a90caf7e5f26fc9bdbe22b036f189
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SHA256
c521271b3c3655b0e7f64da3c8e6410fd83b74c896d7f61f2e48fc68ec821b1c
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SHA512
c1f4075a06be5ad506a0ec16d35db99f6fb648cd8569bf791eb56e7fec5fb3b08e3c163856f9b6b473e0107a5b7afb305a3be8fa72a7c4513a0932af935b5d20
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SSDEEP
24576:h2G/nvxW3WX01Ox/1zDxWnK/5RYaILeborzV3Cs6KJuwmDK8VOIvLy/G9iUUfKDa:hbA3xo3mKnk/VVg/K86G9gfu+0by
Behavioral task
behavioral1
Sample
AtomClient.exe
Resource
win7-20240705-en
Behavioral task
behavioral2
Sample
AtomClient.exe
Resource
win10v2004-20240709-en
Malware Config
Targets
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Target
AtomClient.exe
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Size
2.3MB
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MD5
a9dd17ba223ce69553957c20f4c9ca74
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SHA1
61d11d0b938a90caf7e5f26fc9bdbe22b036f189
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SHA256
c521271b3c3655b0e7f64da3c8e6410fd83b74c896d7f61f2e48fc68ec821b1c
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SHA512
c1f4075a06be5ad506a0ec16d35db99f6fb648cd8569bf791eb56e7fec5fb3b08e3c163856f9b6b473e0107a5b7afb305a3be8fa72a7c4513a0932af935b5d20
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SSDEEP
24576:h2G/nvxW3WX01Ox/1zDxWnK/5RYaILeborzV3Cs6KJuwmDK8VOIvLy/G9iUUfKDa:hbA3xo3mKnk/VVg/K86G9gfu+0by
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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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Modifies WinLogon for persistence
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Process spawned unexpected child process
This typically indicates the parent process was compromised via an exploit or macro.
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Boot or Logon Autostart Execution: Active Setup
Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.
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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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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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MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
3Active Setup
1Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Scheduled Task/Job
1Scheduled Task
1Privilege Escalation
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Boot or Logon Autostart Execution
3Active Setup
1Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Scheduled Task/Job
1Scheduled Task
1