Analysis
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max time kernel
94s -
max time network
142s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
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submitted
22-12-2024 23:49
General
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Target
771f3bc23da9c40adfb3ba5869ecde3890681af6cb8ff9a0c9104b04be3307b3.exe
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Size
952KB
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MD5
066ac67ff4803f8053decd2f83d5834e
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SHA1
4f9a371bbbb0d601d36eb150134397c8e2fb4b06
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SHA256
771f3bc23da9c40adfb3ba5869ecde3890681af6cb8ff9a0c9104b04be3307b3
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SHA512
9ffaf8455c3b36c6c06bd1fd7dd63544376ee5699769b14041186152a428a213be6174c55531cdd46896038d20297e27ccb90a167c1d1537bb73ec4bf516c305
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SSDEEP
24576:W+O7F9smBDJwWmIezBLwsHuWbxR4AK5ZJXX:x8/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 4 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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Drops file in Windows 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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Modifies registry class 1 IoCs
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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 1 IoCs
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Suspicious use of AdjustPrivilegeToken 2 IoCs
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Suspicious use of WriteProcessMemory 6 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\771f3bc23da9c40adfb3ba5869ecde3890681af6cb8ff9a0c9104b04be3307b3.exe"C:\Users\Admin\AppData\Local\Temp\771f3bc23da9c40adfb3ba5869ecde3890681af6cb8ff9a0c9104b04be3307b3.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
- Drops file in Windows directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\tBggnM41ZO.bat"2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\w32tm.exew32tm /stripchart /computer:localhost /period:5 /dataonly /samples:23⤵
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C:\Program Files\Crashpad\reports\RuntimeBroker.exe"C:\Program Files\Crashpad\reports\RuntimeBroker.exe"3⤵
- 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 "RuntimeBroker" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\RuntimeBroker.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 "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\Crashpad\reports\RuntimeBroker.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 "dwm" /sc ONLOGON /tr "'C:\Windows\System32\dbnmpntw\dwm.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 "System" /sc ONLOGON /tr "'C:\Windows\AppReadiness\System.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
MD5ba459618d1b52e5467310a60b61b036c
SHA17e0baacc6523a28f9c914729b876584d7f6d1e78
SHA256081b3c4136df4e03c3c4f0e488afbaf29f559ab7b3201954144bd1d8669481bb
SHA51205b512ae2828ef58bac2d8c9c475db7a3172c08c5da6b3ff77b17cc613082e45cc99692ffb481865791df4de0008c137a067ac280a6e65781ee3dbe27020bdfa
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Filesize
952KB
MD5066ac67ff4803f8053decd2f83d5834e
SHA14f9a371bbbb0d601d36eb150134397c8e2fb4b06
SHA256771f3bc23da9c40adfb3ba5869ecde3890681af6cb8ff9a0c9104b04be3307b3
SHA5129ffaf8455c3b36c6c06bd1fd7dd63544376ee5699769b14041186152a428a213be6174c55531cdd46896038d20297e27ccb90a167c1d1537bb73ec4bf516c305
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Filesize
215B
MD54db81c520ff95328f3bb006f06cd87fa
SHA1df5728878e96bd64d982b9261811b3d0b524d33c
SHA25611293cfc56f07577fd43dc178552696079837c752a3e095d1b278bf405fbf4d2
SHA512922ee4eb7ef10302d69db7c514b94c64875285527e73a6aaf6d314d904bd979c6129f6885d610f5653f493b15e08ee4ebb8c52465745498e7285bd53d2add75b
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Filesize
1.0MB
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Filesize
976KB
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Filesize
64KB
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Filesize
48KB
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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
40KB
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Filesize
8KB
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Filesize
10.8MB
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Filesize
64KB
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Filesize
10.8MB
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Filesize
976KB