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Analysis
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max time kernel
15s -
max time network
16s -
platform
windows7_x64 -
resource
win7-20240708-en -
resource tags
arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system -
submitted
13/01/2025, 19:47
Behavioral task
behavioral1
Sample
891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe
Resource
win7-20240708-en
Behavioral task
behavioral2
Sample
891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe
Resource
win10v2004-20241007-en
General
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Target
891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe
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Size
783KB
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MD5
2dec334a3f065bc25c47a22de6a51b50
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SHA1
2d8ea87b76172f1b112445067a4109b9b5d23cc7
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SHA256
891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476
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SHA512
4264fa67d68d0f942128117e8883f7f8e2715fb65a3fbe550ae1b0e095d57cd79acf8437ede86bfe233d78f14ac200967671461555797356e37f4b0914626549
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SSDEEP
12288:GqnOYxdAgpoNeF91rg5iFdr0yQ9gYx+EIpakCYJRU7Q9bWoFzqK:G+OQbpbgsFdAyQvzSqaq8q
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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Process spawned unexpected child process 5 IoCs
This typically indicates the parent process was compromised via an exploit or macro.
description pid pid_target Process procid_target Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2876 2804 schtasks.exe 30 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2628 2804 schtasks.exe 30 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2864 2804 schtasks.exe 30 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2596 2804 schtasks.exe 30 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2720 2804 schtasks.exe 30 -
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0" 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe -
resource yara_rule behavioral1/memory/2368-1-0x0000000000960000-0x0000000000A2A000-memory.dmp dcrat behavioral1/files/0x0006000000016d71-32.dat dcrat behavioral1/memory/2960-87-0x0000000001280000-0x000000000134A000-memory.dmp dcrat -
Executes dropped EXE 1 IoCs
pid Process 2960 lsm.exe -
Adds Run key to start application 2 TTPs 6 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WmiPrvSE = "\"C:\\Windows\\System32\\wbem\\mpssvc\\WmiPrvSE.exe\"" 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\winlogon = "\"C:\\Program Files\\Microsoft Games\\Mahjong\\ja-JP\\winlogon.exe\"" 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lsm = "\"C:\\Program Files (x86)\\Windows Sidebar\\Gadgets\\Calendar.Gadget\\lsm.exe\"" 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\taskhost = "\"C:\\MSOCache\\All Users\\{90140000-0117-0409-0000-0000000FF1CE}-C\\Access.en-us\\taskhost.exe\"" 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Windows\\Vss\\Writers\\Application\\dwm.exe\"" 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sppsvc = "\"C:\\Users\\Admin\\Local Settings\\sppsvc.exe\"" 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe -
description ioc Process Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe -
Drops file in System32 directory 4 IoCs
description ioc Process File created C:\Windows\System32\wbem\mpssvc\WmiPrvSE.exe 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe File created C:\Windows\System32\wbem\mpssvc\24dbde2999530ef5fd907494bc374d663924116c 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe File opened for modification C:\Windows\System32\wbem\mpssvc\RCXC142.tmp 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe File opened for modification C:\Windows\System32\wbem\mpssvc\WmiPrvSE.exe 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe -
Drops file in Program Files directory 8 IoCs
description ioc Process File created C:\Program Files\Microsoft Games\Mahjong\ja-JP\winlogon.exe 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe File created C:\Program Files\Microsoft Games\Mahjong\ja-JP\cc11b995f2a76da408ea6a601e682e64743153ad 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe File opened for modification C:\Program Files (x86)\Windows Sidebar\Gadgets\Calendar.Gadget\RCXB932.tmp 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe File opened for modification C:\Program Files\Microsoft Games\Mahjong\ja-JP\RCXC345.tmp 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe File opened for modification C:\Program Files\Microsoft Games\Mahjong\ja-JP\winlogon.exe 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe File created C:\Program Files (x86)\Windows Sidebar\Gadgets\Calendar.Gadget\lsm.exe 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe File opened for modification C:\Program Files (x86)\Windows Sidebar\Gadgets\Calendar.Gadget\lsm.exe 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe File created C:\Program Files (x86)\Windows Sidebar\Gadgets\Calendar.Gadget\101b941d020240259ca4912829b53995ad543df6 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe -
Drops file in Windows directory 4 IoCs
description ioc Process File created C:\Windows\Vss\Writers\Application\dwm.exe 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe File created C:\Windows\Vss\Writers\Application\6cb0b6c459d5d3455a3da700e713f2e2529862ff 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe File opened for modification C:\Windows\Vss\Writers\Application\RCXBD3A.tmp 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe File opened for modification C:\Windows\Vss\Writers\Application\dwm.exe 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.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 6 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 2864 schtasks.exe 2596 schtasks.exe 2720 schtasks.exe 2800 schtasks.exe 2876 schtasks.exe 2628 schtasks.exe -
Suspicious behavior: EnumeratesProcesses 10 IoCs
pid Process 2368 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe 2368 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe 2368 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe 2368 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe 2368 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe 2368 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe 2368 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe 2368 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe 2368 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe 2368 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2368 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe Token: SeDebugPrivilege 2960 lsm.exe -
Suspicious use of WriteProcessMemory 3 IoCs
description pid Process procid_target PID 2368 wrote to memory of 2960 2368 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe 37 PID 2368 wrote to memory of 2960 2368 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe 37 PID 2368 wrote to memory of 2960 2368 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe 37 -
System policy modification 1 TTPs 3 IoCs
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0" 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" 891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.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\891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe"C:\Users\Admin\AppData\Local\Temp\891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476N.exe"1⤵
- UAC bypass
- 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
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:2368 -
C:\Program Files (x86)\Windows Sidebar\Gadgets\Calendar.Gadget\lsm.exe"C:\Program Files (x86)\Windows Sidebar\Gadgets\Calendar.Gadget\lsm.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2960
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "lsm" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Sidebar\Gadgets\Calendar.Gadget\lsm.exe'" /rl HIGHEST /f1⤵
- Scheduled Task/Job: Scheduled Task
PID:2800
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0117-0409-0000-0000000FF1CE}-C\Access.en-us\taskhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2876
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\Vss\Writers\Application\dwm.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2628
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Users\Admin\Local Settings\sppsvc.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2864
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Windows\System32\wbem\mpssvc\WmiPrvSE.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2596
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Program Files\Microsoft Games\Mahjong\ja-JP\winlogon.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2720
Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Scheduled Task
1Privilege Escalation
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Scheduled Task
1Replay Monitor
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Downloads
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Filesize
783KB
MD52dec334a3f065bc25c47a22de6a51b50
SHA12d8ea87b76172f1b112445067a4109b9b5d23cc7
SHA256891606919ee03cfd0b194f6ca30e3937312ba92c7225057763bc6f8980484476
SHA5124264fa67d68d0f942128117e8883f7f8e2715fb65a3fbe550ae1b0e095d57cd79acf8437ede86bfe233d78f14ac200967671461555797356e37f4b0914626549