Analysis
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max time kernel
94s -
max time network
95s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
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submitted
07-11-2024 16:04
General
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Target
2c239b6669c4153041e6419d21f83b40bb8da60bb9c1596b8230855669f89e45N.exe
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Size
952KB
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MD5
b6b6b9deddd4eb954adbf89fb10868e0
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SHA1
6def03ac5431eab6aeb6a026b7616576b16eeb68
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SHA256
2c239b6669c4153041e6419d21f83b40bb8da60bb9c1596b8230855669f89e45
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SHA512
ef79a70d058a759bdfa55dd944b65699959b471075e0f1465e5ccc3a163ddcebb2dba7be7fc8a2d8124110e7272c94e860d9de389d31992a03519029dfe5633f
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SSDEEP
24576:u+O7F9smBDJwWmIezBLwsHuWbxR4AK5ZJXX:p8/KfRTK
Malware Config
Signatures
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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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Dcrat family
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Modifies WinLogon for persistence 2 TTPs 4 IoCs
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Process spawned unexpected child process 4 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
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UAC bypass 3 TTPs 6 IoCs
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DCRat payload 3 IoCs
Detects payload of DCRat, commonly dropped by NSIS installers.
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Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
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Executes dropped EXE 1 IoCs
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Adds Run key to start application 2 TTPs 8 IoCs
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Checks whether UAC is enabled 1 TTPs 4 IoCs
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Drops file in System32 directory 5 IoCs
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Drops file in Program Files directory 5 IoCs
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Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Scheduled Task/Job: Scheduled Task 1 TTPs 4 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
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Suspicious behavior: EnumeratesProcesses 3 IoCs
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Suspicious use of AdjustPrivilegeToken 2 IoCs
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Suspicious use of WriteProcessMemory 2 IoCs
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System policy modification 1 TTPs 6 IoCs
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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\2c239b6669c4153041e6419d21f83b40bb8da60bb9c1596b8230855669f89e45N.exe"C:\Users\Admin\AppData\Local\Temp\2c239b6669c4153041e6419d21f83b40bb8da60bb9c1596b8230855669f89e45N.exe"1⤵
- Modifies WinLogon for persistence
- UAC bypass
- Checks computer location settings
- Adds Run key to start application
- Checks whether UAC is enabled
- Drops file in System32 directory
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
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C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\OfficeClickToRun.exe"C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\OfficeClickToRun.exe"2⤵
- UAC bypass
- Executes dropped EXE
- Checks whether UAC is enabled
- Suspicious use of AdjustPrivilegeToken
- System policy modification
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Windows\System32\NAPCRYPT\backgroundTaskHost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\OfficeClickToRun.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "unsecapp" /sc ONLOGON /tr "'C:\PerfLogs\unsecapp.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Users\Public\Downloads\winlogon.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
2Registry 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
2Registry Run Keys / Startup Folder
1Winlogon Helper DLL
1Scheduled Task/Job
1Scheduled Task
1Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
952KB
MD5e4c77151ad98ced70eae630205e93ab9
SHA1a50f55c47257595129b6deee9dcd59c9cb2aa887
SHA25669c6794b6b082beab50213118f052df4c7aecca452d928f2d26410bc36ef0228
SHA51226b90b6b2be43e5323baf45ca95cc51127ac3f3e520dd1b38f36c807db5b793ffb7d754f806dfc8536c0de561876454f85ebec7132d2ce20314bf220e30ba663
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Filesize
952KB
MD5b6b6b9deddd4eb954adbf89fb10868e0
SHA16def03ac5431eab6aeb6a026b7616576b16eeb68
SHA2562c239b6669c4153041e6419d21f83b40bb8da60bb9c1596b8230855669f89e45
SHA512ef79a70d058a759bdfa55dd944b65699959b471075e0f1465e5ccc3a163ddcebb2dba7be7fc8a2d8124110e7272c94e860d9de389d31992a03519029dfe5633f
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Filesize
48KB
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Filesize
64KB
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Filesize
64KB
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Filesize
40KB
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Filesize
8KB
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Filesize
40KB
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Filesize
48KB
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Filesize
48KB
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Filesize
40KB
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Filesize
32KB
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Filesize
10.8MB
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Filesize
976KB
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Filesize
10.8MB