Analysis
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max time kernel
120s -
max time network
121s -
platform
windows7_x64 -
resource
win7-20240903-en -
resource tags
arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system -
submitted
28-01-2025 01:47
Behavioral task
behavioral1
Sample
a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe
Resource
win7-20240903-en
Behavioral task
behavioral2
Sample
a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe
Resource
win10v2004-20241007-en
General
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Target
a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe
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Size
783KB
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MD5
3b3c2d80c5a454a147432307689450cd
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SHA1
6ae70ec700709b860d6c9a501f953e98b2b614e5
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SHA256
a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48
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SHA512
e1f626becf40260dc90559383e95eff8f8d4d2a447a41118b01a6a02002d98d0be2389f4c9030dbc3f4f8bab1d1ec4dc5daa31755b55c6d09d0c6f3f054443a0
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SSDEEP
12288:mqnOYxdAgpoNeF91rg5iFdr0yQ9gYx+EIpakCYJRU7Q9bWoFzqK:m+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 6 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 1968 2812 schtasks.exe 30 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2804 2812 schtasks.exe 30 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2748 2812 schtasks.exe 30 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2724 2812 schtasks.exe 30 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2656 2812 schtasks.exe 30 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2676 2812 schtasks.exe 30 -
UAC bypass 3 TTPs 6 IoCs
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" csrss.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" csrss.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0" csrss.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0" a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe -
resource yara_rule behavioral1/memory/2012-1-0x0000000000CA0000-0x0000000000D6A000-memory.dmp dcrat behavioral1/files/0x000500000001a455-32.dat dcrat behavioral1/files/0x000600000001a41c-85.dat dcrat behavioral1/memory/1144-87-0x0000000000DD0000-0x0000000000E9A000-memory.dmp dcrat -
Executes dropped EXE 1 IoCs
pid Process 1144 csrss.exe -
Adds Run key to start application 2 TTPs 6 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\PerfLogs\\Admin\\csrss.exe\"" a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WmiPrvSE = "\"C:\\Windows\\System32\\wbem\\partmgr\\WmiPrvSE.exe\"" a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dllhost = "\"C:\\Windows\\System32\\C_737\\dllhost.exe\"" a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Windows\\System32\\DWWIN\\dwm.exe\"" a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Program Files\\Windows Media Player\\es-ES\\csrss.exe\"" a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WmiPrvSE = "\"C:\\Windows\\System32\\wbem\\irda\\WmiPrvSE.exe\"" a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe -
Checks whether UAC is enabled 1 TTPs 4 IoCs
description ioc Process Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA csrss.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" csrss.exe -
Drops file in System32 directory 16 IoCs
description ioc Process File created C:\Windows\System32\C_737\dllhost.exe a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe File created C:\Windows\System32\wbem\partmgr\24dbde2999530ef5fd907494bc374d663924116c a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe File created C:\Windows\System32\DWWIN\6cb0b6c459d5d3455a3da700e713f2e2529862ff a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe File created C:\Windows\System32\wbem\irda\24dbde2999530ef5fd907494bc374d663924116c a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe File opened for modification C:\Windows\System32\C_737\RCXB4A2.tmp a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe File created C:\Windows\System32\wbem\partmgr\WmiPrvSE.exe a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe File created C:\Windows\System32\DWWIN\dwm.exe a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe File opened for modification C:\Windows\System32\wbem\partmgr\RCXB29F.tmp a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe File opened for modification C:\Windows\System32\DWWIN\RCXB6A6.tmp a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe File opened for modification C:\Windows\System32\DWWIN\dwm.exe a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe File opened for modification C:\Windows\System32\wbem\irda\WmiPrvSE.exe a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe File created C:\Windows\System32\C_737\5940a34987c99120d96dace90a3f93f329dcad63 a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe File created C:\Windows\System32\wbem\irda\WmiPrvSE.exe a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe File opened for modification C:\Windows\System32\wbem\partmgr\WmiPrvSE.exe a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe File opened for modification C:\Windows\System32\C_737\dllhost.exe a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe File opened for modification C:\Windows\System32\wbem\irda\RCXBB88.tmp a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe -
Drops file in Program Files directory 4 IoCs
description ioc Process File opened for modification C:\Program Files\Windows Media Player\es-ES\csrss.exe a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe File created C:\Program Files\Windows Media Player\es-ES\csrss.exe a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe File created C:\Program Files\Windows Media Player\es-ES\886983d96e3d3e31032c679b2d4ea91b6c05afef a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe File opened for modification C:\Program Files\Windows Media Player\es-ES\RCXB917.tmp a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.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 2748 schtasks.exe 2724 schtasks.exe 2656 schtasks.exe 2676 schtasks.exe 1968 schtasks.exe 2804 schtasks.exe -
Suspicious behavior: EnumeratesProcesses 64 IoCs
pid Process 2012 a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe 2012 a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe 2012 a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe 2012 a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe 2012 a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe 2012 a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe 2012 a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe 2012 a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe 2012 a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe 2012 a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe 2012 a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe 2012 a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe 2012 a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe 2012 a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe 2012 a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe 1144 csrss.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 2012 a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe Token: SeDebugPrivilege 1144 csrss.exe -
Suspicious use of WriteProcessMemory 9 IoCs
description pid Process procid_target PID 2012 wrote to memory of 2596 2012 a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe 37 PID 2012 wrote to memory of 2596 2012 a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe 37 PID 2012 wrote to memory of 2596 2012 a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe 37 PID 2596 wrote to memory of 1700 2596 cmd.exe 39 PID 2596 wrote to memory of 1700 2596 cmd.exe 39 PID 2596 wrote to memory of 1700 2596 cmd.exe 39 PID 2596 wrote to memory of 1144 2596 cmd.exe 41 PID 2596 wrote to memory of 1144 2596 cmd.exe 41 PID 2596 wrote to memory of 1144 2596 cmd.exe 41 -
System policy modification 1 TTPs 6 IoCs
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0" a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" csrss.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" csrss.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0" csrss.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\a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.exe"C:\Users\Admin\AppData\Local\Temp\a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48.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
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:2012 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\9tQXMSwgDC.bat"2⤵
- Suspicious use of WriteProcessMemory
PID:2596 -
C:\Windows\system32\w32tm.exew32tm /stripchart /computer:localhost /period:5 /dataonly /samples:23⤵PID:1700
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C:\Program Files\Windows Media Player\es-ES\csrss.exe"C:\Program Files\Windows Media Player\es-ES\csrss.exe"3⤵
- UAC bypass
- Executes dropped EXE
- Checks whether UAC is enabled
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- System policy modification
PID:1144
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\PerfLogs\Admin\csrss.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1968
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Windows\System32\wbem\partmgr\WmiPrvSE.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2804
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\C_737\dllhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2748
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\System32\DWWIN\dwm.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2724
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files\Windows Media Player\es-ES\csrss.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2656
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Windows\System32\wbem\irda\WmiPrvSE.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2676
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
Loading Replay Monitor...
Downloads
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Filesize
783KB
MD53b3c2d80c5a454a147432307689450cd
SHA16ae70ec700709b860d6c9a501f953e98b2b614e5
SHA256a86128295c56770cca66fc90ae4b45ee074c7748f0a61e76cecb50975d0a5d48
SHA512e1f626becf40260dc90559383e95eff8f8d4d2a447a41118b01a6a02002d98d0be2389f4c9030dbc3f4f8bab1d1ec4dc5daa31755b55c6d09d0c6f3f054443a0
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Filesize
783KB
MD561c49dd397ca043cec66d4a3321bacfa
SHA1f36a1a01cbce1ab5a71b222c1a61bdde6511ab3e
SHA256e43ae6e220cb612d8a47e6757e4eafcde9c8ff1f04052a242f83ea68b3128546
SHA512bbad143ef7f294b99bee289e760ff4723823e5769fd21a5c0e329a8a02a8981bc415dd8b5e1355d21c95be43b478c30f654c207e2d02045ffcc1d0e07c35b839
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Filesize
217B
MD5410f2d2f5cbd179893d68abf3c5b4ddd
SHA16e9a010a5865ce83c681f637886560fccc714016
SHA256f34e2e361905b35c4a0e9304ad5d9177c0cde20912c4ca6ed6089b7e85ce422e
SHA512d9ec33568b7cd1f203928f47c1071265968d6f5b1bf372b7de8f421ef2e1650dbc65909dc6d3dbcc445194ddb4c574c7c3c9cab7142636470e3c3b7a6ff02d52