Analysis
- max time kernel
149s - max time network
150s - platform
windows11-21h2_x64 - resource
win11-20260130-en - resource tags
arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows - submitted
15/04/2026, 15:19
Behavioral task
behavioral1
Sample
xb1a6d71916f5cad89bc5c4d0a341f19727cd5d2db16349bfadee20a583c01947.exe
Resource
win10v2004-20260130-en
Behavioral task
behavioral2
Sample
xb1a6d71916f5cad89bc5c4d0a341f19727cd5d2db16349bfadee20a583c01947.exe
Resource
win11-20260130-en
General
- Target xb1a6d71916f5cad89bc5c4d0a341f19727cd5d2db16349bfadee20a583c01947.exe
- Size 1.2MB
- Sample260415-sqcdpabw5n
- SHA256 b1a6d71916f5cad89bc5c4d0a341f19727cd5d2db16349bfadee20a583c01947
- MD5 66e2b3a125c4c7cc53917a89d0c24fc0
- SHA1 faa931044b211396a8eb382c8fad21e8a6e180d4
- SHA512 ebe2a09903a1e9e90e4f0b2f53108f017502a91e32646e621e44c8743b717fa2e32d40d84c34b37b3fef264df87a07236548b57aa4d19b1595a9adb4fbc6f554
- SSDEEP 24576:a2G/nvxW3Ww0txrfXmj7OBhtEcVtB4jD/2fB:abA301VTtEaWy
- TLSH T129456B017E44CA51F0581633C2FF95044BB4AC512AA6E72B7EF9336E58123A37D1EADB
- MD5 SHA1 SHA512 SSDEEP TLSH
Malware Config
Signatures
- Family: DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
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resource yara_rule behavioral2/files/0x001a00000002b45d-11.dat dcrat behavioral2/memory/4252-13-0x0000000000CB0000-0x0000000000D86000-memory.dmp dcrat - Process spawned unexpected child process 21 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 1852 2928 schtasks.exe 83 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2156 2928 schtasks.exe 83 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2188 2928 schtasks.exe 83 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3888 2928 schtasks.exe 83 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 5040 2928 schtasks.exe 83 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3388 2928 schtasks.exe 83 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3796 2928 schtasks.exe 83 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2148 2928 schtasks.exe 83 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3940 2928 schtasks.exe 83 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4284 2928 schtasks.exe 83 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2480 2928 schtasks.exe 83 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1520 2928 schtasks.exe 83 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2764 2928 schtasks.exe 83 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2496 2928 schtasks.exe 83 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4236 2928 schtasks.exe 83 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2232 2928 schtasks.exe 83 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 436 2928 schtasks.exe 83 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3004 2928 schtasks.exe 83 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3216 2928 schtasks.exe 83 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2672 2928 schtasks.exe 83 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 448 2928 schtasks.exe 83 - Executes dropped EXE 8 IoCs
pid Process 4252 surrogatemonitorDll.exe 1436 sihost.exe 1212 System.exe 2976 csrss.exe 2684 SearchHost.exe 3864 fontdrvhost.exe 2564 Idle.exe 3812 RuntimeBroker.exe - Drops file in Program Files directory 7 IoCs
description ioc Process File created C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.5\System.exe surrogatemonitorDll.exe File opened for modification C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.5\System.exe surrogatemonitorDll.exe File created C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.5\27d1bcfc3c54e0 surrogatemonitorDll.exe File created C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\Idle.exe surrogatemonitorDll.exe File created C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\6ccacd8608530f surrogatemonitorDll.exe File created C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\fontdrvhost.exe surrogatemonitorDll.exe File created C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\5b884080fd4f94 surrogatemonitorDll.exe - Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- System Location Discovery: System Language Discovery 1 TTPs 3 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
description ioc Process Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language xb1a6d71916f5cad89bc5c4d0a341f19727cd5d2db16349bfadee20a583c01947.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language WScript.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language cmd.exe - Modifies registry class 1 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-3119821332-640943685-2562343641-1000_Classes\Local Settings xb1a6d71916f5cad89bc5c4d0a341f19727cd5d2db16349bfadee20a583c01947.exe - Scheduled Task/Job: Scheduled Task 1 TTPs 21 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 3888 schtasks.exe 5040 schtasks.exe 3388 schtasks.exe 2148 schtasks.exe 2764 schtasks.exe 4236 schtasks.exe 2232 schtasks.exe 3004 schtasks.exe 1852 schtasks.exe 2188 schtasks.exe 2480 schtasks.exe 1520 schtasks.exe 436 schtasks.exe 3216 schtasks.exe 2672 schtasks.exe 2156 schtasks.exe 3796 schtasks.exe 3940 schtasks.exe 4284 schtasks.exe 2496 schtasks.exe 448 schtasks.exe - Suspicious behavior: EnumeratesProcesses 6 IoCs
pid Process 4252 surrogatemonitorDll.exe 4252 surrogatemonitorDll.exe 4252 surrogatemonitorDll.exe 4252 surrogatemonitorDll.exe 4252 surrogatemonitorDll.exe 1436 sihost.exe - Suspicious use of AdjustPrivilegeToken 8 IoCs
description pid Process Token: SeDebugPrivilege 4252 surrogatemonitorDll.exe Token: SeDebugPrivilege 1436 sihost.exe Token: SeDebugPrivilege 1212 System.exe Token: SeDebugPrivilege 2976 csrss.exe Token: SeDebugPrivilege 2684 SearchHost.exe Token: SeDebugPrivilege 3864 fontdrvhost.exe Token: SeDebugPrivilege 3812 RuntimeBroker.exe Token: SeDebugPrivilege 2564 Idle.exe - Suspicious use of WriteProcessMemory 4 IoCs
description pid Process procid_target PID 4380 wrote to memory of 3552 4380 xb1a6d71916f5cad89bc5c4d0a341f19727cd5d2db16349bfadee20a583c01947.exe 79 PID 3552 wrote to memory of 2448 3552 WScript.exe 80 PID 2448 wrote to memory of 4252 2448 cmd.exe 82 PID 4252 wrote to memory of 1436 4252 surrogatemonitorDll.exe 112 - 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\xb1a6d71916f5cad89bc5c4d0a341f19727cd5d2db16349bfadee20a583c01947.exe"C:\Users\Admin\AppData\Local\Temp\xb1a6d71916f5cad89bc5c4d0a341f19727cd5d2db16349bfadee20a583c01947.exe"1⤵
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4380 -
C:\Windows\SysWOW64\WScript.exe"C:\Windows\System32\WScript.exe" "C:\containerServerruntimeBrokercrt\uIY3HQ5y.vbe"2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3552 -
C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\containerServerruntimeBrokercrt\WCtpv9M9MG6RIlnUYWV871.bat" "3⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2448 -
C:\containerServerruntimeBrokercrt\surrogatemonitorDll.exe"C:\containerServerruntimeBrokercrt\surrogatemonitorDll.exe"4⤵
- Executes dropped EXE
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4252 -
C:\containerServerruntimeBrokercrt\sihost.exe"C:\containerServerruntimeBrokercrt\sihost.exe"5⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1436
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "SystemS" /sc MINUTE /mo 10 /tr "'C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.5\System.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1852
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.5\System.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2156
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "SystemS" /sc MINUTE /mo 6 /tr "'C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.5\System.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 "IdleI" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\Idle.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3888
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\Idle.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5040
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "IdleI" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\Idle.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3388
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrssc" /sc MINUTE /mo 6 /tr "'C:\Users\Public\AccountPictures\csrss.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3796
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Users\Public\AccountPictures\csrss.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2148
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "csrssc" /sc MINUTE /mo 5 /tr "'C:\Users\Public\AccountPictures\csrss.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3940
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "SearchHostS" /sc MINUTE /mo 9 /tr "'C:\containerServerruntimeBrokercrt\SearchHost.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4284
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "SearchHost" /sc ONLOGON /tr "'C:\containerServerruntimeBrokercrt\SearchHost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2480
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "SearchHostS" /sc MINUTE /mo 6 /tr "'C:\containerServerruntimeBrokercrt\SearchHost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1520
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\fontdrvhost.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2764
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\fontdrvhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2496
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\fontdrvhost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4236
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sihosts" /sc MINUTE /mo 7 /tr "'C:\containerServerruntimeBrokercrt\sihost.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2232
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\containerServerruntimeBrokercrt\sihost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:436
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "sihosts" /sc MINUTE /mo 5 /tr "'C:\containerServerruntimeBrokercrt\sihost.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3004
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 12 /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3216
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2672
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 10 /tr "'C:\Recovery\WindowsRE\RuntimeBroker.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:448
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C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.5\System.exe"C:\Program Files\MSBuild\Microsoft\Windows Workflow Foundation\v3.5\System.exe"1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1212
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C:\Users\Public\AccountPictures\csrss.exe"C:\Users\Public\AccountPictures\csrss.exe"1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2976
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C:\containerServerruntimeBrokercrt\SearchHost.exe"C:\containerServerruntimeBrokercrt\SearchHost.exe"1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2684
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C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\fontdrvhost.exe"C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\fontdrvhost.exe"1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3864
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C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\Idle.exe"C:\Program Files (x86)\MSBuild\Microsoft\Windows Workflow Foundation\Idle.exe"1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2564
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C:\Recovery\WindowsRE\RuntimeBroker.exe"C:\Recovery\WindowsRE\RuntimeBroker.exe"1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3812
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
- Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\RuntimeBroker.exe.log
- Size 1KB
- SHA256 5d8af3c7519874ed42a0d74ee559ae30d9cc6930aef213079347e2b47092c210
- MD5 b4e91d2e5f40d5e2586a86cf3bb4df24
- SHA1 31920b3a41aa4400d4a0230a7622848789b38672
- SHA512 968751b79a98961f145de48d425ea820fd1875bae79a725adf35fc8f4706c103ee0c7babd4838166d8a0dda9fbce3728c0265a04c4b37f335ec4eaa110a2b319
- TLSH T1BF219A722372B1D489163F83085D568827FF8329B550ED0CB999724EED2B01B5B223F7
- MD5 SHA1 SHA512 TLSH
- Path C:\containerServerruntimeBrokercrt\WCtpv9M9MG6RIlnUYWV871.bat
- Size 60B
- SHA256 262289a07fcf5cddfcb51bd19b3fac41165073fe87c0d15073167caf4265d9d1
- MD5 d709395e57f321a2bfc5a072b0879a0a
- SHA1 ee78daacb6ff9ba5006a56fc3fc262a578540f56
- SHA512 5b7dc4c481082870b20a96c9e7600d51c3caa8568cced0db3f0f3226e9655617b48f06a1c9f91286951986027020d92aeac027914d2dc1b4135c0ab5b73ad2fb
- TLSH T139A022000FC80082E000F028382008C0230EEA002C2020023203E032A0E000A230E200
- MD5 SHA1 SHA512 TLSH
- Path C:\containerServerruntimeBrokercrt\surrogatemonitorDll.exe
- Size 827KB
- SHA256 b41563730b142a24c52759dc817580cf98f0ecfd0a9818eb2fdd429e80758fe4
- MD5 84f95e5c8876127a337fab508bf71c8f
- SHA1 b5eb07195f654dffa9a71d9201e69990e7f6d0ad
- SHA512 d9618c7c6513b5afdaa591ed044ae4434ad47678b01cf6123884e139f0530af7e0271b52131b0079cbf2badc7947f21482c107d6852c91c439ccb5b84eed8523
- SSDEEP 12288:FcZRzcfPvJkj7Oc4d4XFpG4y39E4xrKmoCR/fB1FcjNVvH24q:hfXmj7OBhtEcVtB4jD/2f
- TLSH T1F20508017E44CE11F0491233C2EF99484BB4AD5166A6E31B7DBA37BE65127A73C0E9CB
- MD5 SHA1 SHA512 SSDEEP TLSH
- Path C:\containerServerruntimeBrokercrt\uIY3HQ5y.vbe
- Size 230B
- SHA256 8800b721ab1bd9d8bb493a23d55c84c7787efe249b923dfef7e5252e05ab0092
- MD5 e81cfc2f926063e0578a34828c3fe2ff
- SHA1 f2eb7dd3aeb2db655061774bf60233ddc497cda6
- SHA512 b210a0a649383d6b4bbb14770d48581476f9cd54bf04cd424e8fb060b20187beafe647eb82644bb023c3cb172e444a947938d0fe6a661d97154da7eafcc8e443
- TLSH T1D8D0978E256AA2C09C0468C6C2C0C0380D61AAAC4B408EC18C84FA053040D6A39AC7BA
- MD5 SHA1 SHA512 TLSH