Analysis
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max time kernel
95s -
max time network
102s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
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submitted
06-12-2024 12:48
General
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Target
c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
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Size
952KB
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MD5
88da2110432e89c73ed202c4adbec720
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SHA1
e9059a8ba711fe7475bc0de9efe75f758ce6e5e5
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SHA256
c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717
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SHA512
9e4b32ac7c8bde6cf301a7194a91611d7c9fab5ff4d9f4e6ffce88725383452ef7e3336bf4485550f41433068c651f439b0b931e4366f120d8edef0bb1c7a38a
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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 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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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\c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe"C:\Users\Admin\AppData\Local\Temp\c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.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\LKIl6qmA5b.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:\Windows\System32\cabapi\dllhost.exe"C:\Windows\System32\cabapi\dllhost.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 "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\cabapi\dllhost.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 "taskhostw" /sc ONLOGON /tr "'C:\ProgramData\ssh\taskhostw.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 "c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N" /sc ONLOGON /tr "'C:\Program Files\WindowsPowerShell\Modules\c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.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 "TextInputHost" /sc ONLOGON /tr "'C:\Windows\ModemLogs\TextInputHost.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
MD581c783247e4b7667e008945dbf0fdddc
SHA16a929723b9655bb9d08d7de58961be9929b330e0
SHA25637b5ee265a86d9496c4bbc62a1c58d38001a0377b4203d3255a03d0ee1bbd012
SHA5125c2613d0b19d007a0945bd3cf15fa1f12538d8dcd8a05d152aebfae3f8586ac0118d1b3fdf3e99a1e614ec394aec559eadd9554da694861f340b36a8414bfa10
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Filesize
202B
MD5ff401e98912a02dfe6218b1d682ecabb
SHA15ea8db27db63ccea861bf357c1c8310e09c004d5
SHA2565998c5422c9dd710d90b528f72daa052c6f74660f210bce5007414f1b8e4ca9d
SHA5128a68e8a1bf991480e275aa8929d673b001a92931168656a42323e87087dbba2e1febe434f27d055379bc6627aeeb67f097417c0886c87e9827deca071fab3b89
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Filesize
952KB
MD588da2110432e89c73ed202c4adbec720
SHA1e9059a8ba711fe7475bc0de9efe75f758ce6e5e5
SHA256c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717
SHA5129e4b32ac7c8bde6cf301a7194a91611d7c9fab5ff4d9f4e6ffce88725383452ef7e3336bf4485550f41433068c651f439b0b931e4366f120d8edef0bb1c7a38a
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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
40KB
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Filesize
48KB
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Filesize
48KB
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Filesize
64KB
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Filesize
10.8MB
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Filesize
10.8MB
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Filesize
976KB