Analysis
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max time kernel
421s -
max time network
425s -
platform
windows11-21h2_x64 -
resource
win11-20240709-en -
resource tags
arch:x64arch:x86image:win11-20240709-enlocale:en-usos:windows11-21h2-x64system -
submitted
20-07-2024 15:41
Behavioral task
behavioral1
Sample
5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe
Resource
win10v2004-20240709-en
Behavioral task
behavioral2
Sample
5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe
Resource
win11-20240709-en
General
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Target
5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe
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Size
2.0MB
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MD5
6e4e01af6b88116f0c7331bba5e7b782
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SHA1
756c0a5ea8aac86f41d118166452a011a608043c
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SHA256
5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147
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SHA512
f49b6146f313624606a9eb80287c23c68aaefcf7ffafacba83a87b333b4388dd38a423a179b7bcb0e1d555873681b405c781faf68e2d7169fa7bcefe4a73874b
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SSDEEP
24576:jYe7C5QSBzoU/n15NuQtG+7IwzwT2wLqq12OBOa2WYO3QFSBztYSqEEU5oZUSzTO:jYemPM0tvmwGBF223ZztBqEqx9v
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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Modifies WinLogon for persistence 2 TTPs 3 IoCs
Processes:
5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exedescription ioc process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Program Files (x86)\\WindowsPowerShell\\Modules\\backgroundTaskHost.exe\"" 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Program Files (x86)\\WindowsPowerShell\\Modules\\backgroundTaskHost.exe\", \"C:\\Windows\\BrowserCore\\en-US\\RuntimeBroker.exe\"" 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Program Files (x86)\\WindowsPowerShell\\Modules\\backgroundTaskHost.exe\", \"C:\\Windows\\BrowserCore\\en-US\\RuntimeBroker.exe\", \"C:\\Users\\Public\\Libraries\\dllhost.exe\"" 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe -
Process spawned unexpected child process 9 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
Processes:
schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exedescription pid pid_target process target process Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1952 2764 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1512 2764 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2440 2764 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 580 2764 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4468 2764 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2188 2764 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1608 2764 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4692 2764 schtasks.exe Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4544 2764 schtasks.exe -
Processes:
resource yara_rule behavioral2/memory/1484-1-0x0000000000EA0000-0x00000000010AE000-memory.dmp dcrat C:\Users\Public\Libraries\dllhost.exe dcrat -
Executes dropped EXE 1 IoCs
Processes:
dllhost.exepid process 4812 dllhost.exe -
Adds Run key to start application 2 TTPs 6 IoCs
Processes:
5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exedescription ioc process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dllhost = "\"C:\\Users\\Public\\Libraries\\dllhost.exe\"" 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe Set value (str) \REGISTRY\USER\S-1-5-21-514081398-208714212-3319599467-1000\Software\Microsoft\Windows\CurrentVersion\Run\backgroundTaskHost = "\"C:\\Program Files (x86)\\WindowsPowerShell\\Modules\\backgroundTaskHost.exe\"" 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\backgroundTaskHost = "\"C:\\Program Files (x86)\\WindowsPowerShell\\Modules\\backgroundTaskHost.exe\"" 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe Set value (str) \REGISTRY\USER\S-1-5-21-514081398-208714212-3319599467-1000\Software\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Windows\\BrowserCore\\en-US\\RuntimeBroker.exe\"" 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Windows\\BrowserCore\\en-US\\RuntimeBroker.exe\"" 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe Set value (str) \REGISTRY\USER\S-1-5-21-514081398-208714212-3319599467-1000\Software\Microsoft\Windows\CurrentVersion\Run\dllhost = "\"C:\\Users\\Public\\Libraries\\dllhost.exe\"" 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe -
Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
Processes:
flow ioc 1 ip-api.com -
Drops file in Program Files directory 3 IoCs
Processes:
5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exedescription ioc process File created C:\Program Files (x86)\WindowsPowerShell\Modules\backgroundTaskHost.exe 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe File opened for modification C:\Program Files (x86)\WindowsPowerShell\Modules\backgroundTaskHost.exe 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe File created C:\Program Files (x86)\WindowsPowerShell\Modules\eddb19405b7ce1 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe -
Drops file in Windows directory 2 IoCs
Processes:
5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exedescription ioc process File created C:\Windows\BrowserCore\en-US\RuntimeBroker.exe 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe File created C:\Windows\BrowserCore\en-US\9e8d7a4ca61bd9 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe -
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 9 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
Processes:
schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exepid process 1512 schtasks.exe 580 schtasks.exe 4544 schtasks.exe 1952 schtasks.exe 2440 schtasks.exe 4468 schtasks.exe 2188 schtasks.exe 1608 schtasks.exe 4692 schtasks.exe -
Suspicious behavior: EnumeratesProcesses 18 IoCs
Processes:
5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exedllhost.exepid process 1484 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe 1484 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe 1484 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe 1484 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe 1484 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe 1484 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe 4812 dllhost.exe 4812 dllhost.exe 4812 dllhost.exe 4812 dllhost.exe 4812 dllhost.exe 4812 dllhost.exe 4812 dllhost.exe 4812 dllhost.exe 4812 dllhost.exe 4812 dllhost.exe 4812 dllhost.exe 4812 dllhost.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exedllhost.exedescription pid process Token: SeDebugPrivilege 1484 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe Token: SeDebugPrivilege 4812 dllhost.exe -
Suspicious use of WriteProcessMemory 2 IoCs
Processes:
5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exedescription pid process target process PID 1484 wrote to memory of 4812 1484 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe dllhost.exe PID 1484 wrote to memory of 4812 1484 5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe dllhost.exe -
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\5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe"C:\Users\Admin\AppData\Local\Temp\5a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147.exe"1⤵
- Modifies WinLogon for persistence
- Adds Run key to start application
- Drops file in Program Files directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1484 -
C:\Users\Public\Libraries\dllhost.exe"C:\Users\Public\Libraries\dllhost.exe"2⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4812
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\WindowsPowerShell\Modules\backgroundTaskHost.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1952
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Program Files (x86)\WindowsPowerShell\Modules\backgroundTaskHost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1512
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\WindowsPowerShell\Modules\backgroundTaskHost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2440
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 13 /tr "'C:\Windows\BrowserCore\en-US\RuntimeBroker.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:580
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\BrowserCore\en-US\RuntimeBroker.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4468
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 7 /tr "'C:\Windows\BrowserCore\en-US\RuntimeBroker.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2188
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 8 /tr "'C:\Users\Public\Libraries\dllhost.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1608
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Users\Public\Libraries\dllhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4692
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 11 /tr "'C:\Users\Public\Libraries\dllhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4544
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
1Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
2.0MB
MD56e4e01af6b88116f0c7331bba5e7b782
SHA1756c0a5ea8aac86f41d118166452a011a608043c
SHA2565a335f4ea90b29144cf268dccdc8f8e1757e57cccc941cc7334b8f4bd7999147
SHA512f49b6146f313624606a9eb80287c23c68aaefcf7ffafacba83a87b333b4388dd38a423a179b7bcb0e1d555873681b405c781faf68e2d7169fa7bcefe4a73874b