Analysis
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max time kernel
456s -
max time network
1179s -
platform
windows11-21h2_x64 -
resource
win11-20240426-en -
resource tags
arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system -
submitted
05-06-2024 16:03
Behavioral task
behavioral1
Sample
C37boot/C37Bootstrapper.exe
Resource
win10v2004-20240226-en
General
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Target
C37boot/C37Bootstrapper.exe
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Size
405KB
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MD5
c8294556e29920bfcc619529da141096
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SHA1
7dad1b482c1d3baeade911400027e615e2ea52ff
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SHA256
26deb9a0264cccfdef387610235e9e9032144c8e73561c3d0007c248a6c84dc3
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SHA512
1ac29a6ecdf761d85d3b1b64910f7edd865238d1d6b159532efb8260fa9af35c7db06892359ba9efe7bd571ec2bd259a0621721666fd5b085e92f68848f63af6
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SSDEEP
6144:nloZM+rIkd8g+EtXHkv/iD4w85EFzQEb3CzFQMpFlb8e1mBiEqkRH:loZtL+EP8w85EFzQEb3CzFQMpfvEJ
Malware Config
Signatures
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Detect Umbral payload 1 IoCs
resource yara_rule behavioral2/memory/1732-1-0x0000012A29D80000-0x0000012A29DEC000-memory.dmp family_umbral -
Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs
Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.
pid Process 3420 powershell.exe -
Drops file in Drivers directory 1 IoCs
description ioc Process File opened for modification C:\Windows\System32\drivers\etc\hosts C37Bootstrapper.exe -
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs
flow ioc 1 discord.com 6 discord.com -
Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.
flow ioc 1 ip-api.com -
Detects videocard installed 1 TTPs 1 IoCs
Uses WMIC.exe to determine videocard installed.
pid Process 4720 wmic.exe -
Runs ping.exe 1 TTPs 1 IoCs
pid Process 2896 PING.EXE -
Suspicious behavior: EnumeratesProcesses 11 IoCs
pid Process 1732 C37Bootstrapper.exe 3420 powershell.exe 3420 powershell.exe 2084 powershell.exe 2084 powershell.exe 2016 powershell.exe 2016 powershell.exe 680 powershell.exe 680 powershell.exe 2524 powershell.exe 2524 powershell.exe -
Suspicious use of AdjustPrivilegeToken 64 IoCs
description pid Process Token: SeDebugPrivilege 1732 C37Bootstrapper.exe Token: SeIncreaseQuotaPrivilege 3164 wmic.exe Token: SeSecurityPrivilege 3164 wmic.exe Token: SeTakeOwnershipPrivilege 3164 wmic.exe Token: SeLoadDriverPrivilege 3164 wmic.exe Token: SeSystemProfilePrivilege 3164 wmic.exe Token: SeSystemtimePrivilege 3164 wmic.exe Token: SeProfSingleProcessPrivilege 3164 wmic.exe Token: SeIncBasePriorityPrivilege 3164 wmic.exe Token: SeCreatePagefilePrivilege 3164 wmic.exe Token: SeBackupPrivilege 3164 wmic.exe Token: SeRestorePrivilege 3164 wmic.exe Token: SeShutdownPrivilege 3164 wmic.exe Token: SeDebugPrivilege 3164 wmic.exe Token: SeSystemEnvironmentPrivilege 3164 wmic.exe Token: SeRemoteShutdownPrivilege 3164 wmic.exe Token: SeUndockPrivilege 3164 wmic.exe Token: SeManageVolumePrivilege 3164 wmic.exe Token: 33 3164 wmic.exe Token: 34 3164 wmic.exe Token: 35 3164 wmic.exe Token: 36 3164 wmic.exe Token: SeIncreaseQuotaPrivilege 3164 wmic.exe Token: SeSecurityPrivilege 3164 wmic.exe Token: SeTakeOwnershipPrivilege 3164 wmic.exe Token: SeLoadDriverPrivilege 3164 wmic.exe Token: SeSystemProfilePrivilege 3164 wmic.exe Token: SeSystemtimePrivilege 3164 wmic.exe Token: SeProfSingleProcessPrivilege 3164 wmic.exe Token: SeIncBasePriorityPrivilege 3164 wmic.exe Token: SeCreatePagefilePrivilege 3164 wmic.exe Token: SeBackupPrivilege 3164 wmic.exe Token: SeRestorePrivilege 3164 wmic.exe Token: SeShutdownPrivilege 3164 wmic.exe Token: SeDebugPrivilege 3164 wmic.exe Token: SeSystemEnvironmentPrivilege 3164 wmic.exe Token: SeRemoteShutdownPrivilege 3164 wmic.exe Token: SeUndockPrivilege 3164 wmic.exe Token: SeManageVolumePrivilege 3164 wmic.exe Token: 33 3164 wmic.exe Token: 34 3164 wmic.exe Token: 35 3164 wmic.exe Token: 36 3164 wmic.exe Token: SeDebugPrivilege 3420 powershell.exe Token: SeDebugPrivilege 2084 powershell.exe Token: SeDebugPrivilege 2016 powershell.exe Token: SeDebugPrivilege 680 powershell.exe Token: SeIncreaseQuotaPrivilege 2656 wmic.exe Token: SeSecurityPrivilege 2656 wmic.exe Token: SeTakeOwnershipPrivilege 2656 wmic.exe Token: SeLoadDriverPrivilege 2656 wmic.exe Token: SeSystemProfilePrivilege 2656 wmic.exe Token: SeSystemtimePrivilege 2656 wmic.exe Token: SeProfSingleProcessPrivilege 2656 wmic.exe Token: SeIncBasePriorityPrivilege 2656 wmic.exe Token: SeCreatePagefilePrivilege 2656 wmic.exe Token: SeBackupPrivilege 2656 wmic.exe Token: SeRestorePrivilege 2656 wmic.exe Token: SeShutdownPrivilege 2656 wmic.exe Token: SeDebugPrivilege 2656 wmic.exe Token: SeSystemEnvironmentPrivilege 2656 wmic.exe Token: SeRemoteShutdownPrivilege 2656 wmic.exe Token: SeUndockPrivilege 2656 wmic.exe Token: SeManageVolumePrivilege 2656 wmic.exe -
Suspicious use of WriteProcessMemory 26 IoCs
description pid Process procid_target PID 1732 wrote to memory of 3164 1732 C37Bootstrapper.exe 76 PID 1732 wrote to memory of 3164 1732 C37Bootstrapper.exe 76 PID 1732 wrote to memory of 4160 1732 C37Bootstrapper.exe 79 PID 1732 wrote to memory of 4160 1732 C37Bootstrapper.exe 79 PID 1732 wrote to memory of 3420 1732 C37Bootstrapper.exe 81 PID 1732 wrote to memory of 3420 1732 C37Bootstrapper.exe 81 PID 1732 wrote to memory of 2084 1732 C37Bootstrapper.exe 83 PID 1732 wrote to memory of 2084 1732 C37Bootstrapper.exe 83 PID 1732 wrote to memory of 2016 1732 C37Bootstrapper.exe 85 PID 1732 wrote to memory of 2016 1732 C37Bootstrapper.exe 85 PID 1732 wrote to memory of 680 1732 C37Bootstrapper.exe 87 PID 1732 wrote to memory of 680 1732 C37Bootstrapper.exe 87 PID 1732 wrote to memory of 2656 1732 C37Bootstrapper.exe 89 PID 1732 wrote to memory of 2656 1732 C37Bootstrapper.exe 89 PID 1732 wrote to memory of 416 1732 C37Bootstrapper.exe 91 PID 1732 wrote to memory of 416 1732 C37Bootstrapper.exe 91 PID 1732 wrote to memory of 1656 1732 C37Bootstrapper.exe 93 PID 1732 wrote to memory of 1656 1732 C37Bootstrapper.exe 93 PID 1732 wrote to memory of 2524 1732 C37Bootstrapper.exe 95 PID 1732 wrote to memory of 2524 1732 C37Bootstrapper.exe 95 PID 1732 wrote to memory of 4720 1732 C37Bootstrapper.exe 97 PID 1732 wrote to memory of 4720 1732 C37Bootstrapper.exe 97 PID 1732 wrote to memory of 2828 1732 C37Bootstrapper.exe 99 PID 1732 wrote to memory of 2828 1732 C37Bootstrapper.exe 99 PID 2828 wrote to memory of 2896 2828 cmd.exe 101 PID 2828 wrote to memory of 2896 2828 cmd.exe 101 -
Views/modifies file attributes 1 TTPs 1 IoCs
pid Process 4160 attrib.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\C37boot\C37Bootstrapper.exe"C:\Users\Admin\AppData\Local\Temp\C37boot\C37Bootstrapper.exe"1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1732 -
C:\Windows\System32\Wbem\wmic.exe"wmic.exe" csproduct get uuid2⤵
- Suspicious use of AdjustPrivilegeToken
PID:3164
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C:\Windows\SYSTEM32\attrib.exe"attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\C37boot\C37Bootstrapper.exe"2⤵
- Views/modifies file attributes
PID:4160
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\C37boot\C37Bootstrapper.exe'2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3420
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"powershell.exe" Set-MpPreference -DisableIntrusionPreventionSystem $true -DisableIOAVProtection $true -DisableRealtimeMonitoring $true -DisableScriptScanning $true -EnableControlledFolderAccess Disabled -EnableNetworkProtection AuditMode -Force -MAPSReporting Disabled -SubmitSamplesConsent NeverSend && powershell Set-MpPreference -SubmitSamplesConsent 22⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2084
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2016
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY2⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:680
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C:\Windows\System32\Wbem\wmic.exe"wmic.exe" os get Caption2⤵
- Suspicious use of AdjustPrivilegeToken
PID:2656
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C:\Windows\System32\Wbem\wmic.exe"wmic.exe" computersystem get totalphysicalmemory2⤵PID:416
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C:\Windows\System32\Wbem\wmic.exe"wmic.exe" csproduct get uuid2⤵PID:1656
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER2⤵
- Suspicious behavior: EnumeratesProcesses
PID:2524
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C:\Windows\System32\Wbem\wmic.exe"wmic" path win32_VideoController get name2⤵
- Detects videocard installed
PID:4720
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C:\Windows\SYSTEM32\cmd.exe"cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\C37boot\C37Bootstrapper.exe" && pause2⤵
- Suspicious use of WriteProcessMemory
PID:2828 -
C:\Windows\system32\PING.EXEping localhost3⤵
- Runs ping.exe
PID:2896
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
2KB
MD5627073ee3ca9676911bee35548eff2b8
SHA14c4b68c65e2cab9864b51167d710aa29ebdcff2e
SHA25685b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c
SHA5123c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb
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Filesize
944B
MD52e8eb51096d6f6781456fef7df731d97
SHA1ec2aaf851a618fb43c3d040a13a71997c25bda43
SHA25696bfd9dd5883329927fe8c08b8956355a1a6ceb30ceeb5d4252b346df32bc864
SHA5120a73dc9a49f92d9dd556c2ca2e36761890b3538f355ee1f013e7cf648d8c4d065f28046cd4a167db3dea304d1fbcbcea68d11ce6e12a3f20f8b6c018a60422d2
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Filesize
948B
MD5ed6f17e13c0654979a4c7673c20ca8ec
SHA10295ab73ec0b415f93206f44e8fef38b1d05059a
SHA25666a90f7beaaa14c629fbd53754873b19ed99db9469566c43d0ca810ca48662f1
SHA5121eb7e9be650cf837d74546f24d62263df4b89c985bd208ed52870afd7726f08c9e7412bb5a2dfae2cae01aeec156a2c28d4dc1398b84a5c7fc4035cb84c697d8
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Filesize
1KB
MD57332074ae2b01262736b6fbd9e100dac
SHA122f992165065107cc9417fa4117240d84414a13c
SHA256baea84fda6c1f13090b8cbd91c920848946f10ce155ef31a1df4cd453ee7e4aa
SHA5124ae6f0e012c31ac1fc2ff4a8877ce2b4667c45b6e651de798318a39a2b6fd39a6f72dffa8b0b89b7a045a27d724d195656faa25a9fec79b22f37ddebb5d22da2
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Filesize
1KB
MD516740a37c1dcd3f409e390608e6b39a1
SHA1f7f5ce20d16e00462fef8bc86b8d2ffabd0b7bf5
SHA256b64860418404e3c1c768e71a9e9523ae0f294f0547b102e749cb880d6556c244
SHA512b081ff8f70c1900eca6ff0322a4502a1746aa542f21d799824f9fcca2470b97c0d560591b304b491492a5db01f8a4a6ca37e2b5895ad1b1c5ad32ad49104e325
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Filesize
60B
MD5d17fe0a3f47be24a6453e9ef58c94641
SHA16ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA25696ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
SHA5125b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82