Analysis
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max time kernel
93s -
max time network
144s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
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submitted
23-12-2024 00:00
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 6 IoCs
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Process spawned unexpected child process 6 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 12 IoCs
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Checks whether UAC is enabled 1 TTPs 4 IoCs
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Drops file in System32 directory 15 IoCs
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Drops file in Windows directory 1 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 6 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 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\etHSLN8dTB.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:\Users\All Users\Adobe\RuntimeBroker.exe"C:\Users\All Users\Adobe\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:\Users\All Users\Adobe\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 "winlogon" /sc ONLOGON /tr "'C:\Windows\System32\vss_ps\winlogon.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\PeerDistHttpTrans\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 "MusNotification" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\MusNotification.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 "fontdrvhost" /sc ONLOGON /tr "'C:\Documents and Settings\fontdrvhost.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 "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\pcwum\dllhost.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
206B
MD5ecc523ceabd5f1a1c1a41bd99390fa6d
SHA1178cec830e86c04e0a5d7f467a264a21e811db37
SHA256203d9a7abdca8c86001fb4961ef9db27ad1a7e35289952f2b298103fb2ae6c33
SHA512138c66fae203415c80b6a082024b64e9862a738348aa093f7b7fb64f12d359f670ccbb8cc198508f88d3e15c630985c800ebdd966dce677a1f85bb31871e23a1
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Filesize
952KB
MD5066ac67ff4803f8053decd2f83d5834e
SHA14f9a371bbbb0d601d36eb150134397c8e2fb4b06
SHA256771f3bc23da9c40adfb3ba5869ecde3890681af6cb8ff9a0c9104b04be3307b3
SHA5129ffaf8455c3b36c6c06bd1fd7dd63544376ee5699769b14041186152a428a213be6174c55531cdd46896038d20297e27ccb90a167c1d1537bb73ec4bf516c305
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Filesize
952KB
MD53fb8b34216deb5eb692e0db487f57b1e
SHA1047a9ec59ed3bf61be3c76e1305fe2cb5b239d35
SHA25652e0947a7e23f4567d909e99d5a58416bf81aae4a973d1a2be6039af00cd1896
SHA512b8607dec67ab3bc7a5ad0ae9c4c4a8749ef9ada9caf76c7732b801d7ca25bf07b388f1cf5668fc2c5e4925519e95613a06f0cfee75eb61559ae45ad1b20078eb
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Filesize
64KB
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Filesize
8KB
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Filesize
40KB
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Filesize
48KB
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Filesize
40KB
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Filesize
32KB
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Filesize
48KB
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Filesize
40KB
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Filesize
48KB
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Filesize
64KB
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Filesize
10.8MB
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Filesize
976KB
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Filesize
10.8MB