umbral | 73207e68fd2611a51968b6903020cedf7d6c07eeb7e8570de6ac533d93d31e25

Analysis

max time kernel
451s
max time network
1172s
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 16:14

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General

Target

C37boot/C37Bootstrapper.exe
Size

405KB
MD5

c8294556e29920bfcc619529da141096
SHA1

7dad1b482c1d3baeade911400027e615e2ea52ff
SHA256

26deb9a0264cccfdef387610235e9e9032144c8e73561c3d0007c248a6c84dc3
SHA512

1ac29a6ecdf761d85d3b1b64910f7edd865238d1d6b159532efb8260fa9af35c7db06892359ba9efe7bd571ec2bd259a0621721666fd5b085e92f68848f63af6
SSDEEP

6144:nloZM+rIkd8g+EtXHkv/iD4w85EFzQEb3CzFQMpFlb8e1mBiEqkRH:loZtL+EP8w85EFzQEb3CzFQMpfvEJ

Score

10^/10

umbral execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral2/memory/2084-1-0x0000021F14B30000-0x0000021F14B9C000-memory.dmp	family_umbral

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer 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.

execution

PowerShell

T1059.001

pid	Process
4856	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.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

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.

System Information Discovery

T1082

pid	Process
3704	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
3096	PING.EXE

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
2084	C37Bootstrapper.exe
4856	powershell.exe
4856	powershell.exe
1708	powershell.exe
1708	powershell.exe
564	powershell.exe
564	powershell.exe
2780	powershell.exe
2780	powershell.exe
3840	powershell.exe
3840	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2084	C37Bootstrapper.exe
Token: SeIncreaseQuotaPrivilege	1536	wmic.exe
Token: SeSecurityPrivilege	1536	wmic.exe
Token: SeTakeOwnershipPrivilege	1536	wmic.exe
Token: SeLoadDriverPrivilege	1536	wmic.exe
Token: SeSystemProfilePrivilege	1536	wmic.exe
Token: SeSystemtimePrivilege	1536	wmic.exe
Token: SeProfSingleProcessPrivilege	1536	wmic.exe
Token: SeIncBasePriorityPrivilege	1536	wmic.exe
Token: SeCreatePagefilePrivilege	1536	wmic.exe
Token: SeBackupPrivilege	1536	wmic.exe
Token: SeRestorePrivilege	1536	wmic.exe
Token: SeShutdownPrivilege	1536	wmic.exe
Token: SeDebugPrivilege	1536	wmic.exe
Token: SeSystemEnvironmentPrivilege	1536	wmic.exe
Token: SeRemoteShutdownPrivilege	1536	wmic.exe
Token: SeUndockPrivilege	1536	wmic.exe
Token: SeManageVolumePrivilege	1536	wmic.exe
Token: 33	1536	wmic.exe
Token: 34	1536	wmic.exe
Token: 35	1536	wmic.exe
Token: 36	1536	wmic.exe
Token: SeIncreaseQuotaPrivilege	1536	wmic.exe
Token: SeSecurityPrivilege	1536	wmic.exe
Token: SeTakeOwnershipPrivilege	1536	wmic.exe
Token: SeLoadDriverPrivilege	1536	wmic.exe
Token: SeSystemProfilePrivilege	1536	wmic.exe
Token: SeSystemtimePrivilege	1536	wmic.exe
Token: SeProfSingleProcessPrivilege	1536	wmic.exe
Token: SeIncBasePriorityPrivilege	1536	wmic.exe
Token: SeCreatePagefilePrivilege	1536	wmic.exe
Token: SeBackupPrivilege	1536	wmic.exe
Token: SeRestorePrivilege	1536	wmic.exe
Token: SeShutdownPrivilege	1536	wmic.exe
Token: SeDebugPrivilege	1536	wmic.exe
Token: SeSystemEnvironmentPrivilege	1536	wmic.exe
Token: SeRemoteShutdownPrivilege	1536	wmic.exe
Token: SeUndockPrivilege	1536	wmic.exe
Token: SeManageVolumePrivilege	1536	wmic.exe
Token: 33	1536	wmic.exe
Token: 34	1536	wmic.exe
Token: 35	1536	wmic.exe
Token: 36	1536	wmic.exe
Token: SeDebugPrivilege	4856	powershell.exe
Token: SeDebugPrivilege	1708	powershell.exe
Token: SeDebugPrivilege	564	powershell.exe
Token: SeDebugPrivilege	2780	powershell.exe
Token: SeIncreaseQuotaPrivilege	4224	wmic.exe
Token: SeSecurityPrivilege	4224	wmic.exe
Token: SeTakeOwnershipPrivilege	4224	wmic.exe
Token: SeLoadDriverPrivilege	4224	wmic.exe
Token: SeSystemProfilePrivilege	4224	wmic.exe
Token: SeSystemtimePrivilege	4224	wmic.exe
Token: SeProfSingleProcessPrivilege	4224	wmic.exe
Token: SeIncBasePriorityPrivilege	4224	wmic.exe
Token: SeCreatePagefilePrivilege	4224	wmic.exe
Token: SeBackupPrivilege	4224	wmic.exe
Token: SeRestorePrivilege	4224	wmic.exe
Token: SeShutdownPrivilege	4224	wmic.exe
Token: SeDebugPrivilege	4224	wmic.exe
Token: SeSystemEnvironmentPrivilege	4224	wmic.exe
Token: SeRemoteShutdownPrivilege	4224	wmic.exe
Token: SeUndockPrivilege	4224	wmic.exe
Token: SeManageVolumePrivilege	4224	wmic.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 2084 wrote to memory of 1536	2084	C37Bootstrapper.exe	77
PID 2084 wrote to memory of 1536	2084	C37Bootstrapper.exe	77
PID 2084 wrote to memory of 1976	2084	C37Bootstrapper.exe	80
PID 2084 wrote to memory of 1976	2084	C37Bootstrapper.exe	80
PID 2084 wrote to memory of 4856	2084	C37Bootstrapper.exe	82
PID 2084 wrote to memory of 4856	2084	C37Bootstrapper.exe	82
PID 2084 wrote to memory of 1708	2084	C37Bootstrapper.exe	84
PID 2084 wrote to memory of 1708	2084	C37Bootstrapper.exe	84
PID 2084 wrote to memory of 564	2084	C37Bootstrapper.exe	86
PID 2084 wrote to memory of 564	2084	C37Bootstrapper.exe	86
PID 2084 wrote to memory of 2780	2084	C37Bootstrapper.exe	88
PID 2084 wrote to memory of 2780	2084	C37Bootstrapper.exe	88
PID 2084 wrote to memory of 4224	2084	C37Bootstrapper.exe	90
PID 2084 wrote to memory of 4224	2084	C37Bootstrapper.exe	90
PID 2084 wrote to memory of 4544	2084	C37Bootstrapper.exe	92
PID 2084 wrote to memory of 4544	2084	C37Bootstrapper.exe	92
PID 2084 wrote to memory of 1652	2084	C37Bootstrapper.exe	94
PID 2084 wrote to memory of 1652	2084	C37Bootstrapper.exe	94
PID 2084 wrote to memory of 3840	2084	C37Bootstrapper.exe	96
PID 2084 wrote to memory of 3840	2084	C37Bootstrapper.exe	96
PID 2084 wrote to memory of 3704	2084	C37Bootstrapper.exe	98
PID 2084 wrote to memory of 3704	2084	C37Bootstrapper.exe	98
PID 2084 wrote to memory of 1936	2084	C37Bootstrapper.exe	100
PID 2084 wrote to memory of 1936	2084	C37Bootstrapper.exe	100
PID 1936 wrote to memory of 3096	1936	cmd.exe	102
PID 1936 wrote to memory of 3096	1936	cmd.exe	102

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
1976	attrib.exe

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:2084
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1536
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\C37boot\C37Bootstrapper.exe"
  2⤵
  - Views/modifies file attributes
  PID:1976
- 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:4856
- 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 2
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1708
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:564
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2780
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4224
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:4544
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1652
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:3840
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:3704
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\C37boot\C37Bootstrapper.exe" && pause
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1936
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - Runs ping.exe
    PID:3096

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
627073ee3ca9676911bee35548eff2b8

SHA1
4c4b68c65e2cab9864b51167d710aa29ebdcff2e

SHA256
85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

SHA512
3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
e3840d9bcedfe7017e49ee5d05bd1c46

SHA1
272620fb2605bd196df471d62db4b2d280a363c6

SHA256
3ac83e70415b9701ee71a4560232d7998e00c3db020fde669eb01b8821d2746f

SHA512
76adc88ab3930acc6b8b7668e2de797b8c00edcfc41660ee4485259c72a8adf162db62c2621ead5a9950f12bfe8a76ccab79d02fda11860afb0e217812cac376

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
948B

MD5
4b92d741d003e8d1f0394874017a6fe9

SHA1
1a4bebc2637bce160dae38d4d0bfdeb6b398059d

SHA256
8c8532230d71f0818daebff0d2ab496b02c25bdaa7156701f663b5474ad876fc

SHA512
5c2e84b072314aaae414f98f7dbeb13e030561b53270803d0cf7a8c6ed59368dcfdc4666e69abef39fcac5b75968a1174aca501023297a276a219ed0464612c6

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
1KB

MD5
7332074ae2b01262736b6fbd9e100dac

SHA1
22f992165065107cc9417fa4117240d84414a13c

SHA256
baea84fda6c1f13090b8cbd91c920848946f10ce155ef31a1df4cd453ee7e4aa

SHA512
4ae6f0e012c31ac1fc2ff4a8877ce2b4667c45b6e651de798318a39a2b6fd39a6f72dffa8b0b89b7a045a27d724d195656faa25a9fec79b22f37ddebb5d22da2

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
1KB

MD5
00b5dac0faabd946e46411c68c4e4b54

SHA1
ebffe4f7312c6a3ea1a5bfb8e36e3716b73a71de

SHA256
ba0bccd5b683d96eda6d4000424147e0dddaa1e6c87dd65566721f4552397133

SHA512
25a291425f8ac169440d5a6250b2eae67261d599bd35aa3e02c742deed5aedea7d4e88910947116068759e3b8cb5fd82c29b6360d86b663fc536b09bd69ac9c0

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ar3ti4fj.env.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2084-68-0x0000021F2F400000-0x0000021F2F412000-memory.dmp

Filesize
72KB

Download
memory/2084-33-0x0000021F2F350000-0x0000021F2F36E000-memory.dmp

Filesize
120KB

Download
memory/2084-85-0x00007FF863370000-0x00007FF863E32000-memory.dmp

Filesize
10.8MB

Download
memory/2084-67-0x0000021F2F2C0000-0x0000021F2F2CA000-memory.dmp

Filesize
40KB

Download
memory/2084-2-0x00007FF863370000-0x00007FF863E32000-memory.dmp

Filesize
10.8MB

Download
memory/2084-31-0x0000021F2F380000-0x0000021F2F3F6000-memory.dmp

Filesize
472KB

Download
memory/2084-32-0x0000021F2F300000-0x0000021F2F350000-memory.dmp

Filesize
320KB

Download
memory/2084-0-0x00007FF863373000-0x00007FF863375000-memory.dmp

Filesize
8KB

Download
memory/2084-1-0x0000021F14B30000-0x0000021F14B9C000-memory.dmp

Filesize
432KB

Download
memory/4856-14-0x00007FF863370000-0x00007FF863E32000-memory.dmp

Filesize
10.8MB

Download
memory/4856-6-0x0000026D47D00000-0x0000026D47D22000-memory.dmp

Filesize
136KB

Download
memory/4856-3-0x00007FF863370000-0x00007FF863E32000-memory.dmp

Filesize
10.8MB

Download
memory/4856-13-0x00007FF863370000-0x00007FF863E32000-memory.dmp

Filesize
10.8MB

Download
memory/4856-17-0x00007FF863370000-0x00007FF863E32000-memory.dmp

Filesize
10.8MB

Download