Analysis
- max time kernel
91s - max time network
140s - platform
windows10-2004_x64 - resource
win10v2004-20240426-en - resource tags
- submitted
29/05/2024, 18:46
General
- Target 119a68034c34af185b41be35067f1851.exe
- Size 1.9MB
- Sample240529-xelkfaee75
- SHA256 88ca97ed664243845afb3693bcbe5150e3628039e34f99b49df865442b60b4f1
Malware Config
Signatures
- DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
- Modifies WinLogon for persistence 2 TTPs 2 IoCs
- Process spawned unexpected child process 6 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
- DCRat payload 3 IoCs
Detects payload of DCRat, commonly dropped by NSIS installers.
- Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs
Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 1 IoCs
- Adds Run key to start application 2 TTPs 4 IoCs
- Drops file in System32 directory 4 IoCs
- Drops file in Program Files directory 4 IoCs
- Drops file in Windows directory 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Creates scheduled task(s) 1 TTPs 6 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: EnumeratesProcesses 63 IoCs
- Suspicious use of AdjustPrivilegeToken 5 IoCs
- Suspicious use of WriteProcessMemory 8 IoCs
- Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
Processes
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C:\Users\Admin\AppData\Local\Temp\119a68034c34af185b41be35067f1851.exe"C:\Users\Admin\AppData\Local\Temp\119a68034c34af185b41be35067f1851.exe"1⤵
- Modifies WinLogon for persistence
- Checks computer location settings
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Program Files directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\119a68034c34af185b41be35067f1851.exe'2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"powershell" -Command Add-MpPreference -ExclusionPath 'C:\Program Files (x86)\Google\Temp\MusNotification.exe'2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\SysWOW64\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\dllhost.exe'2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\SysWOW64\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\dllhost.exe"C:\Windows\SysWOW64\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\dllhost.exe"2⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "MusNotificationM" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Google\Temp\MusNotification.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "MusNotification" /sc ONLOGON /tr "'C:\Program Files (x86)\Google\Temp\MusNotification.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "MusNotificationM" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Google\Temp\MusNotification.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 11 /tr "'C:\Windows\SysWOW64\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\dllhost.exe'" /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\SysWOW64\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\dllhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 6 /tr "'C:\Windows\SysWOW64\catroot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE}\dllhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Scheduled Task/Job
1Replay Monitor
Loading Replay Monitor...
Downloads
RCX6E2C.tmp
powershell.exe.log
StartupProfileData-NonInteractive
StartupProfileData-NonInteractive
__PSScriptPolicyTest_kgx25wze.dow.ps1
dllhost.exe
memory/928-16-0x000000001B7F0000-0x000000001B7FC000-memory.dmp
memory/928-21-0x000000001B970000-0x000000001B97C000-memory.dmp
memory/928-8-0x000000001AFF0000-0x000000001B006000-memory.dmp
memory/928-9-0x000000001B010000-0x000000001B020000-memory.dmp
memory/928-11-0x000000001B640000-0x000000001B652000-memory.dmp
memory/928-10-0x000000001B020000-0x000000001B02C000-memory.dmp
memory/928-12-0x000000001BC10000-0x000000001C138000-memory.dmp
memory/928-13-0x000000001B670000-0x000000001B67C000-memory.dmp
memory/928-14-0x000000001B680000-0x000000001B68C000-memory.dmp
memory/928-15-0x000000001B7E0000-0x000000001B7E8000-memory.dmp
memory/928-0-0x00007FFAE48B3000-0x00007FFAE48B5000-memory.dmp
memory/928-20-0x00007FFAE48B0000-0x00007FFAE5371000-memory.dmp
memory/928-17-0x000000001B800000-0x000000001B80E000-memory.dmp
memory/928-7-0x000000001AEB0000-0x000000001AEC0000-memory.dmp
memory/928-19-0x000000001B960000-0x000000001B96E000-memory.dmp
memory/928-24-0x00007FFAE48B0000-0x00007FFAE5371000-memory.dmp
memory/928-23-0x000000001B990000-0x000000001B99C000-memory.dmp
memory/928-22-0x000000001B980000-0x000000001B98A000-memory.dmp
memory/928-18-0x000000001B950000-0x000000001B958000-memory.dmp
memory/928-6-0x000000001B690000-0x000000001B6E0000-memory.dmp
memory/928-5-0x000000001AFD0000-0x000000001AFEC000-memory.dmp
memory/928-1-0x00000000000A0000-0x000000000029A000-memory.dmp
memory/928-4-0x000000001AEA0000-0x000000001AEA8000-memory.dmp
memory/928-3-0x0000000002420000-0x000000000242E000-memory.dmp
memory/928-2-0x00007FFAE48B0000-0x00007FFAE5371000-memory.dmp
memory/928-114-0x00007FFAE48B0000-0x00007FFAE5371000-memory.dmp
memory/3800-117-0x000000001C320000-0x000000001C332000-memory.dmp
memory/4440-79-0x000001FBAA620000-0x000001FBAA642000-memory.dmp