Analysis
- max time kernel
149s - max time network
127s - platform
windows11-21h2_x64 - resource
win11-20260130-en - resource tags
arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows - submitted
24/04/2026, 22:38
Behavioral task
behavioral1
Sample
DCRatBuild.exe
Resource
win10v2004-20260130-en
Behavioral task
behavioral2
Sample
DCRatBuild.exe
Resource
win11-20260130-en
General
- Target DCRatBuild.exe
- Size 1.1MB
- Sample260424-2kr2maew3p
- SHA256 165b1c1b49febea0873894eeb6c808170943d02da8cb7fc3fffa636528b339b2
- MD5 5aa3659d8379d7df25723ec91b4c4948
- SHA1 b50864141b0c726b0b4b805d2807a641c16ccf17
- SHA512 f08e14eaaa724c5bc76ba2855e40fca85c03fb1f017e44f38e981f7e3c8411dfcf6554a627deced2e3000992d2040756c63d20ba8963f54fb0672a241cda8998
- SSDEEP 24576:U2G/nvxW3Ww0t4bzRah02RQ530uBDduu7bcEry:UbA304bN+ROCuL+
- TLSH T16B4549017E448A12F0191633C2FF464847B9AC516AA6E32FBEB9376D55123E37D0DACB
- 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/0x001a00000002b3dd-12.dat dcrat behavioral2/memory/5324-14-0x00000000003C0000-0x0000000000496000-memory.dmp dcrat - Process spawned unexpected child process 15 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 2968 5084 schtasks.exe 82 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2712 5084 schtasks.exe 82 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3636 5084 schtasks.exe 82 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3856 5084 schtasks.exe 82 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 5176 5084 schtasks.exe 82 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3148 5084 schtasks.exe 82 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2104 5084 schtasks.exe 82 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4372 5084 schtasks.exe 82 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1308 5084 schtasks.exe 82 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 5856 5084 schtasks.exe 82 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 5836 5084 schtasks.exe 82 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4084 5084 schtasks.exe 82 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4004 5084 schtasks.exe 82 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1036 5084 schtasks.exe 82 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 4460 5084 schtasks.exe 82 - Executes dropped EXE 7 IoCs
pid Process 5324 msChain.exe 4012 cmd.exe 2780 services.exe 1072 msChain.exe 644 Registry.exe 5320 lsass.exe 5540 cmd.exe - Contacts third-party web service commonly abused for C2 1 TTPs 2 IoCs
Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.
flow ioc 5 pastebin.com 1 pastebin.com - Drops file in Program Files directory 7 IoCs
description ioc Process File created C:\Program Files\Uninstall Information\7905950199d6cf msChain.exe File created C:\Program Files\Microsoft Office 15\ClientX64\services.exe msChain.exe File opened for modification C:\Program Files\Microsoft Office 15\ClientX64\services.exe msChain.exe File created C:\Program Files\Microsoft Office 15\ClientX64\c5b4cb5e9653cc msChain.exe File created C:\Program Files\Windows Media Player\Registry.exe msChain.exe File created C:\Program Files\Windows Media Player\ee2ad38f3d4382 msChain.exe File created C:\Program Files\Uninstall Information\msChain.exe msChain.exe - Drops file in Windows directory 1 IoCs
description ioc Process File created C:\Windows\WUModels\msChain.exe msChain.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 cmd.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language DCRatBuild.exe Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language WScript.exe - Modifies registry class 2 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-2397528088-2630719772-1129911217-1000_Classes\Local Settings DCRatBuild.exe Key created \REGISTRY\USER\S-1-5-21-2397528088-2630719772-1129911217-1000_Classes\Local Settings cmd.exe - Scheduled Task/Job: Scheduled Task 1 TTPs 15 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
pid Process 3148 schtasks.exe 5836 schtasks.exe 4460 schtasks.exe 2712 schtasks.exe 3856 schtasks.exe 5176 schtasks.exe 4372 schtasks.exe 4084 schtasks.exe 1036 schtasks.exe 2104 schtasks.exe 1308 schtasks.exe 5856 schtasks.exe 4004 schtasks.exe 2968 schtasks.exe 3636 schtasks.exe - Suspicious behavior: EnumeratesProcesses 13 IoCs
pid Process 5324 msChain.exe 5324 msChain.exe 5324 msChain.exe 5324 msChain.exe 5324 msChain.exe 5324 msChain.exe 5324 msChain.exe 5324 msChain.exe 5324 msChain.exe 5324 msChain.exe 5324 msChain.exe 4012 cmd.exe 5540 cmd.exe - Suspicious use of AdjustPrivilegeToken 7 IoCs
description pid Process Token: SeDebugPrivilege 5324 msChain.exe Token: SeDebugPrivilege 4012 cmd.exe Token: SeDebugPrivilege 2780 services.exe Token: SeDebugPrivilege 1072 msChain.exe Token: SeDebugPrivilege 644 Registry.exe Token: SeDebugPrivilege 5320 lsass.exe Token: SeDebugPrivilege 5540 cmd.exe - Suspicious use of WriteProcessMemory 7 IoCs
description pid Process procid_target PID 4708 wrote to memory of 3464 4708 DCRatBuild.exe 78 PID 3464 wrote to memory of 460 3464 WScript.exe 79 PID 460 wrote to memory of 5324 460 cmd.exe 81 PID 5324 wrote to memory of 4012 5324 msChain.exe 98 PID 4012 wrote to memory of 324 4012 cmd.exe 107 PID 324 wrote to memory of 5168 324 cmd.exe 109 PID 324 wrote to memory of 5540 324 cmd.exe 110 - 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\DCRatBuild.exe"C:\Users\Admin\AppData\Local\Temp\DCRatBuild.exe"1⤵
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4708 -
C:\Windows\SysWOW64\WScript.exe"C:\Windows\System32\WScript.exe" "C:\SurrogateRefbrokercrt\TJIPXZ1yt.vbe"2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3464 -
C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\SurrogateRefbrokercrt\jt8xO24p5NQDb5Q9aCeJAGLTHcI6x.bat" "3⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:460 -
C:\SurrogateRefbrokercrt\msChain.exe"C:\SurrogateRefbrokercrt\msChain.exe"4⤵
- Executes dropped EXE
- Drops file in Program Files directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5324 -
C:\SurrogateRefbrokercrt\cmd.exe"C:\SurrogateRefbrokercrt\cmd.exe"5⤵
- Executes dropped EXE
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4012 -
C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\gJVLZ7RDs3.bat"6⤵
- Suspicious use of WriteProcessMemory
PID:324 -
C:\Windows\system32\w32tm.exew32tm /stripchart /computer:localhost /period:5 /dataonly /samples:27⤵PID:5168
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C:\SurrogateRefbrokercrt\cmd.exe"C:\SurrogateRefbrokercrt\cmd.exe"7⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:5540
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "servicess" /sc MINUTE /mo 7 /tr "'C:\Program Files\Microsoft Office 15\ClientX64\services.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2712
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Program Files\Microsoft Office 15\ClientX64\services.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2968
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "servicess" /sc MINUTE /mo 8 /tr "'C:\Program Files\Microsoft Office 15\ClientX64\services.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3636
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "cmdc" /sc MINUTE /mo 9 /tr "'C:\SurrogateRefbrokercrt\cmd.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3856
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "cmd" /sc ONLOGON /tr "'C:\SurrogateRefbrokercrt\cmd.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5176
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "cmdc" /sc MINUTE /mo 6 /tr "'C:\SurrogateRefbrokercrt\cmd.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3148
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 7 /tr "'C:\Program Files\Windows Media Player\Registry.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2104
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Program Files\Windows Media Player\Registry.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4372
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 11 /tr "'C:\Program Files\Windows Media Player\Registry.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1308
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "msChainm" /sc MINUTE /mo 11 /tr "'C:\Program Files\Uninstall Information\msChain.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5856
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "msChain" /sc ONLOGON /tr "'C:\Program Files\Uninstall Information\msChain.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5836
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "msChainm" /sc MINUTE /mo 7 /tr "'C:\Program Files\Uninstall Information\msChain.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4084
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "lsassl" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\lsass.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4004
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\lsass.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1036
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "lsassl" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\lsass.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4460
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C:\Program Files\Microsoft Office 15\ClientX64\services.exe"C:\Program Files\Microsoft Office 15\ClientX64\services.exe"1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2780
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C:\Program Files\Uninstall Information\msChain.exe"C:\Program Files\Uninstall Information\msChain.exe"1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1072
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C:\Program Files\Windows Media Player\Registry.exe"C:\Program Files\Windows Media Player\Registry.exe"1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:644
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C:\Recovery\WindowsRE\lsass.exe"C:\Recovery\WindowsRE\lsass.exe"1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:5320
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
- Path C:\SurrogateRefbrokercrt\TJIPXZ1yt.vbe
- Size 227B
- SHA256 936d5f829b602372e59c4573a5f994438c331663ccd053c37929f5a346690dcb
- MD5 6a651bb43f9a0b8e2aa2a424c3148500
- SHA1 6b4299ec860a2e7b5dc058f63b05379cd606649e
- SHA512 b3b71cbecd573c0de4671a9e805a3e10e3848142a32a8f5e537d12b03b298b28e6f553528eeb536499326aee9d68063ac3993d2b2e6674fba078b3e79b981be4
- TLSH T139D023A82031A2E0CF0C8483CA82D82C2DD0AF25C6841BC3C0E4D103D24242E302E3C9
- MD5 SHA1 SHA512 TLSH
- Path C:\SurrogateRefbrokercrt\jt8xO24p5NQDb5Q9aCeJAGLTHcI6x.bat
- Size 38B
- SHA256 1b75ab2792d0fed0d38d14470fd1dafd02374be28646d10cc8bfb19ff844d576
- MD5 b65a6e2b419464093cc095c96f2a1110
- SHA1 f798604cd9142de24773acc4fa6cead4952b4961
- SHA512 d8d3b50fd0f7d63cb476e29ca88cc2a7e618424001f75d83d9d4b141defd1273c95a8c6ff7cd3cfa20b4d18551fefb9a4eb43b532df444afe0b455b8496ca9e4
- MD5 SHA1 SHA512
- Path C:\SurrogateRefbrokercrt\msChain.exe
- Size 827KB
- SHA256 3f3e54accb490183056af560213747d3ece4f140b7e40047a7095753ccc894b2
- MD5 f2a152310592363457262a142ca15851
- SHA1 f3ca49f1b23a37c4dca6662b2a479c608c54d4f7
- SHA512 4cf5418dd482f8abce7dc66c50caa3319638e9d76bb3fa9a9562e492db484135dce497f518bfade6fb04babf4ad63afdefa5f647529a07136a2fd947dcff4ff2
- SSDEEP 12288:UbxRep5n0DYsah0DYSn+CU6tVdKzRlW5i+mRFfuBK5C91ndpM6P7bcEUi:UbzRah02RQ530uBDduu7bcEr
- TLSH T11A05F6027E44CE12F0091233C2EF454887B9995166A6E32FBDBA376E55523E77C0DACB
- MD5 SHA1 SHA512 SSDEEP TLSH
- Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\cmd.exe.log
- Size 1KB
- SHA256 5d8af3c7519874ed42a0d74ee559ae30d9cc6930aef213079347e2b47092c210
- MD5 b4e91d2e5f40d5e2586a86cf3bb4df24
- SHA1 31920b3a41aa4400d4a0230a7622848789b38672
- SHA512 968751b79a98961f145de48d425ea820fd1875bae79a725adf35fc8f4706c103ee0c7babd4838166d8a0dda9fbce3728c0265a04c4b37f335ec4eaa110a2b319
- TLSH T1BF219A722372B1D489163F83085D568827FF8329B550ED0CB999724EED2B01B5B223F7
- MD5 SHA1 SHA512 TLSH
- Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\msChain.exe.log
- Size 1KB
- SHA256 28e57db6d7535775b5e65c90ab208c7fe392e373056db5d35e76854270ecd05d
- MD5 400b532c938aca538f01c5616cf318cd
- SHA1 598a59a9434e51a6416f91a4c83bd02505ecb846
- SHA512 b15583323c457d389b873eb31b8e59fef450c0c0e684b0f797231e8d0abace9227b15d4e45b45f4c79ad044a28cc3d79f9f7c2a81bd38e43b0c09f07aaa95b73
- TLSH T16331AB7123B2B0D4891A3F471C2D56C813FF8329B550EE4CB998A25EE92741B5F222F3
- MD5 SHA1 SHA512 TLSH
- Path C:\Users\Admin\AppData\Local\Temp\gJVLZ7RDs3.bat
- Size 197B
- SHA256 4ae9c5d14a93a950ece76a8bc4a130588a5277ca67780ac14cec31cc29e292a4
- MD5 bea0bfa8c9558abc19c02478e2a309ae
- SHA1 8cc6dc83e8635ca167622ddd0e508668e2be454c
- SHA512 c0faa0d0e7b751fdc8747f343dcc556064bab9dec9f051976e5226d1ef55d922c65e1bd5c95d75a3712d5a14814c7a132f5c92435889175b57fcda3ea71eeb2d
- TLSH T195D022029002C718088308631ACA1A8CB013288D7AC1B5A00B960C6826DB47AF29E6C1
- MD5 SHA1 SHA512 TLSH