Analysis
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max time kernel
150s -
max time network
151s -
platform
windows10-2004_x64 -
resource
win10v2004-20241007-en -
resource tags
arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system -
submitted
13-12-2024 22:09
Behavioral task
behavioral1
Sample
2021A9779C45F35A46B1B28F2E9136FA.exe
Resource
win7-20241010-en
General
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Target
2021A9779C45F35A46B1B28F2E9136FA.exe
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Size
2.8MB
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MD5
2021a9779c45f35a46b1b28f2e9136fa
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SHA1
76e03dfcc8732388fad4fd83b72b34cad50786ca
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SHA256
c8ea81ec0afa16e1e7c0bc325396be024c993479765a9e4ad26b29d83bbfb01a
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SHA512
5fc1617b672c308df2116cbfcd08e6d6b1c4969c3399dd9eb4c6d12a08bac23ac897c76de20cb1730fe44b50cf2bb840b11332f01f016ca1d4d6ab1bbdd19116
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SSDEEP
49152:7CFujkASUPVAIsINt8BCt3GSHBZTz0uBHTNS/lhv+8PUkYH4j:GFixPV9s4CqWQbzB+dc8BJj
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 3360 528 schtasks.exe 82 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2020 528 schtasks.exe 82 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 3204 528 schtasks.exe 82 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1492 528 schtasks.exe 82 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 1260 528 schtasks.exe 82 Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process 2912 528 schtasks.exe 82 -
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" 2021A9779C45F35A46B1B28F2E9136FA.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0" 2021A9779C45F35A46B1B28F2E9136FA.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" RuntimeBroker.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" RuntimeBroker.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0" RuntimeBroker.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 2021A9779C45F35A46B1B28F2E9136FA.exe -
resource yara_rule behavioral2/memory/4744-1-0x0000000000960000-0x0000000000C2C000-memory.dmp dcrat behavioral2/files/0x0008000000023c8b-35.dat dcrat -
Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs
Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.
pid Process 3556 powershell.exe 1620 powershell.exe 1636 powershell.exe -
Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
description ioc Process Key value queried \REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation 2021A9779C45F35A46B1B28F2E9136FA.exe Key value queried \REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation RuntimeBroker.exe -
Executes dropped EXE 1 IoCs
pid Process 4460 RuntimeBroker.exe -
description ioc Process Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA 2021A9779C45F35A46B1B28F2E9136FA.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 2021A9779C45F35A46B1B28F2E9136FA.exe Key value queried \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA RuntimeBroker.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" RuntimeBroker.exe -
Drops file in Windows directory 3 IoCs
description ioc Process File created C:\Windows\appcompat\Programs\RuntimeBroker.exe 2021A9779C45F35A46B1B28F2E9136FA.exe File opened for modification C:\Windows\appcompat\Programs\RuntimeBroker.exe 2021A9779C45F35A46B1B28F2E9136FA.exe File created C:\Windows\appcompat\Programs\9e8d7a4ca61bd9 2021A9779C45F35A46B1B28F2E9136FA.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Modifies registry class 1 IoCs
description ioc Process Key created \REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000_Classes\Local Settings RuntimeBroker.exe -
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 1492 schtasks.exe 1260 schtasks.exe 2912 schtasks.exe 3360 schtasks.exe 2020 schtasks.exe 3204 schtasks.exe -
Suspicious behavior: EnumeratesProcesses 64 IoCs
pid Process 4744 2021A9779C45F35A46B1B28F2E9136FA.exe 4744 2021A9779C45F35A46B1B28F2E9136FA.exe 4744 2021A9779C45F35A46B1B28F2E9136FA.exe 4744 2021A9779C45F35A46B1B28F2E9136FA.exe 4744 2021A9779C45F35A46B1B28F2E9136FA.exe 1620 powershell.exe 1636 powershell.exe 3556 powershell.exe 3556 powershell.exe 1620 powershell.exe 1636 powershell.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe 4460 RuntimeBroker.exe -
Suspicious behavior: GetForegroundWindowSpam 1 IoCs
pid Process 4460 RuntimeBroker.exe -
Suspicious use of AdjustPrivilegeToken 5 IoCs
description pid Process Token: SeDebugPrivilege 4744 2021A9779C45F35A46B1B28F2E9136FA.exe Token: SeDebugPrivilege 1620 powershell.exe Token: SeDebugPrivilege 3556 powershell.exe Token: SeDebugPrivilege 1636 powershell.exe Token: SeDebugPrivilege 4460 RuntimeBroker.exe -
Suspicious use of WriteProcessMemory 12 IoCs
description pid Process procid_target PID 4744 wrote to memory of 1636 4744 2021A9779C45F35A46B1B28F2E9136FA.exe 89 PID 4744 wrote to memory of 1636 4744 2021A9779C45F35A46B1B28F2E9136FA.exe 89 PID 4744 wrote to memory of 1620 4744 2021A9779C45F35A46B1B28F2E9136FA.exe 90 PID 4744 wrote to memory of 1620 4744 2021A9779C45F35A46B1B28F2E9136FA.exe 90 PID 4744 wrote to memory of 3556 4744 2021A9779C45F35A46B1B28F2E9136FA.exe 91 PID 4744 wrote to memory of 3556 4744 2021A9779C45F35A46B1B28F2E9136FA.exe 91 PID 4744 wrote to memory of 4460 4744 2021A9779C45F35A46B1B28F2E9136FA.exe 95 PID 4744 wrote to memory of 4460 4744 2021A9779C45F35A46B1B28F2E9136FA.exe 95 PID 4460 wrote to memory of 2508 4460 RuntimeBroker.exe 96 PID 4460 wrote to memory of 2508 4460 RuntimeBroker.exe 96 PID 4460 wrote to memory of 4412 4460 RuntimeBroker.exe 97 PID 4460 wrote to memory of 4412 4460 RuntimeBroker.exe 97 -
System policy modification 1 TTPs 6 IoCs
description ioc Process Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0" 2021A9779C45F35A46B1B28F2E9136FA.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" RuntimeBroker.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" RuntimeBroker.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0" RuntimeBroker.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0" 2021A9779C45F35A46B1B28F2E9136FA.exe Set value (int) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0" 2021A9779C45F35A46B1B28F2E9136FA.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\2021A9779C45F35A46B1B28F2E9136FA.exe"C:\Users\Admin\AppData\Local\Temp\2021A9779C45F35A46B1B28F2E9136FA.exe"1⤵
- UAC bypass
- Checks computer location settings
- Checks whether UAC is enabled
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:4744 -
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\2021A9779C45F35A46B1B28F2E9136FA.exe'2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1636
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\appcompat\Programs\RuntimeBroker.exe'2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1620
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\taskhostw.exe'2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3556
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C:\Windows\appcompat\Programs\RuntimeBroker.exe"C:\Windows\appcompat\Programs\RuntimeBroker.exe"2⤵
- UAC bypass
- Checks computer location settings
- Executes dropped EXE
- Checks whether UAC is enabled
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:4460 -
C:\Windows\System32\WScript.exe"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\8c0200b8-c64e-4ccd-81c7-bcc27a7a7687.vbs"3⤵PID:2508
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C:\Windows\System32\WScript.exe"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\3e66b920-77fb-457f-94ac-bb78d5ae805c.vbs"3⤵PID:4412
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\Windows\appcompat\Programs\RuntimeBroker.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3360
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\appcompat\Programs\RuntimeBroker.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2020
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 12 /tr "'C:\Windows\appcompat\Programs\RuntimeBroker.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3204
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 12 /tr "'C:\Users\Admin\taskhostw.exe'" /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1492
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "taskhostw" /sc ONLOGON /tr "'C:\Users\Admin\taskhostw.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1260
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C:\Windows\system32\schtasks.exeschtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 9 /tr "'C:\Users\Admin\taskhostw.exe'" /rl HIGHEST /f1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2912
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C:\Windows\system32\wbem\WmiApSrv.exeC:\Windows\system32\wbem\WmiApSrv.exe1⤵PID:4776
Network
MITRE ATT&CK Enterprise v15
Execution
Command and Scripting Interpreter
1PowerShell
1Scheduled Task/Job
1Scheduled Task
1Privilege Escalation
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Scheduled Task/Job
1Scheduled Task
1Replay Monitor
Loading Replay Monitor...
Downloads
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Filesize
2KB
MD5d85ba6ff808d9e5444a4b369f5bc2730
SHA131aa9d96590fff6981b315e0b391b575e4c0804a
SHA25684739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f
SHA5128c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249
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Filesize
944B
MD56d3e9c29fe44e90aae6ed30ccf799ca8
SHA1c7974ef72264bbdf13a2793ccf1aed11bc565dce
SHA2562360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d
SHA51260c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a
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Filesize
944B
MD56d42b6da621e8df5674e26b799c8e2aa
SHA1ab3ce1327ea1eeedb987ec823d5e0cb146bafa48
SHA2565ab6a1726f425c6d0158f55eb8d81754ddedd51e651aa0a899a29b7a58619c4c
SHA51253faffbda8a835bc1143e894c118c15901a5fd09cfc2224dd2f754c06dc794897315049a579b9a8382d4564f071576045aaaf824019b7139d939152dca38ce29
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Filesize
499B
MD5c54c39ad12712f167a5c88df4fd97e58
SHA10d9439fb87b826aafc1710f724a5e477cf83c98e
SHA2567807e356e793c9f06ce8f7dfd90b0942ed8c94a59b3f807b6f31efb91b971b2d
SHA51231892e1f272e77a998b7483a16f4f0d35ae80b6a866e3832173ba6992b6057a6b5a77d561c37dca34710333f563021f5400cbc52b3f148097526bdfe916bb7bb
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Filesize
723B
MD536e24c97e4d32079c32844d7110a2859
SHA1ec7b785f1b6fa8236b075e907b3fbaf01b05181f
SHA256499729eeb3eec1012130481890040a290922c21773f05de0964be04a6cb405e7
SHA512d6ea02457807a6d1f23eb0ce0905dd5b24b0360de06911676116bac8c9faadbc2908ac33f12b851cb9196185c18a8ec1823b496e661e1737ad97a785e289f254
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Filesize
60B
MD5d17fe0a3f47be24a6453e9ef58c94641
SHA16ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA25696ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA5125b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
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Filesize
2.8MB
MD52021a9779c45f35a46b1b28f2e9136fa
SHA176e03dfcc8732388fad4fd83b72b34cad50786ca
SHA256c8ea81ec0afa16e1e7c0bc325396be024c993479765a9e4ad26b29d83bbfb01a
SHA5125fc1617b672c308df2116cbfcd08e6d6b1c4969c3399dd9eb4c6d12a08bac23ac897c76de20cb1730fe44b50cf2bb840b11332f01f016ca1d4d6ab1bbdd19116