umbral | b8e51135b2e0a124ac1103a9c4a6f2353d289ffe99611d990c291ae356950ecf

Analysis

max time kernel
120s
max time network
121s
platform
windows7_x64
resource
win7-20240708-en
resource tags

arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
submitted
03-09-2024 13:05

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General

Target

umbralstealer.exe
Size

229KB
MD5

83b81dda82a62350b52ee97a12d3163a
SHA1

3e7c9d5eda676771071fa77ce8f357b0c32673fa
SHA256

b8e51135b2e0a124ac1103a9c4a6f2353d289ffe99611d990c291ae356950ecf
SHA512

e0d0d47479b19287dbb731b0025c458623fa17e77d506756a7e90289abf0c04faa5e655bd2f521ead68d3c8530cb4ecaf1cb1c48e1fe2e03759affe8c0c4ca04
SSDEEP

6144:lloZM9fsXtioRkts/cnnK6cMlxDKxX8il927De8NhoREb8e1muoi:noZXtlRk83MlxDKxX8il927De8NhoOJ

Score

10^/10

umbral credential_access execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/2568-1-0x0000000000070000-0x00000000000B0000-memory.dmp	family_umbral

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral
Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
credential_access stealer

Credentials from Web Browsers
T1555.003

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
2388	powershell.exe
2656	powershell.exe
2912	powershell.exe
2860	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	umbralstealer.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

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
6	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
1280	wmic.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2388	powershell.exe
2860	powershell.exe
2656	powershell.exe
2692	powershell.exe
2912	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2568	umbralstealer.exe
Token: SeDebugPrivilege	2388	powershell.exe
Token: SeDebugPrivilege	2860	powershell.exe
Token: SeDebugPrivilege	2656	powershell.exe
Token: SeDebugPrivilege	2692	powershell.exe
Token: SeIncreaseQuotaPrivilege	1700	wmic.exe
Token: SeSecurityPrivilege	1700	wmic.exe
Token: SeTakeOwnershipPrivilege	1700	wmic.exe
Token: SeLoadDriverPrivilege	1700	wmic.exe
Token: SeSystemProfilePrivilege	1700	wmic.exe
Token: SeSystemtimePrivilege	1700	wmic.exe
Token: SeProfSingleProcessPrivilege	1700	wmic.exe
Token: SeIncBasePriorityPrivilege	1700	wmic.exe
Token: SeCreatePagefilePrivilege	1700	wmic.exe
Token: SeBackupPrivilege	1700	wmic.exe
Token: SeRestorePrivilege	1700	wmic.exe
Token: SeShutdownPrivilege	1700	wmic.exe
Token: SeDebugPrivilege	1700	wmic.exe
Token: SeSystemEnvironmentPrivilege	1700	wmic.exe
Token: SeRemoteShutdownPrivilege	1700	wmic.exe
Token: SeUndockPrivilege	1700	wmic.exe
Token: SeManageVolumePrivilege	1700	wmic.exe
Token: 33	1700	wmic.exe
Token: 34	1700	wmic.exe
Token: 35	1700	wmic.exe
Token: SeIncreaseQuotaPrivilege	1700	wmic.exe
Token: SeSecurityPrivilege	1700	wmic.exe
Token: SeTakeOwnershipPrivilege	1700	wmic.exe
Token: SeLoadDriverPrivilege	1700	wmic.exe
Token: SeSystemProfilePrivilege	1700	wmic.exe
Token: SeSystemtimePrivilege	1700	wmic.exe
Token: SeProfSingleProcessPrivilege	1700	wmic.exe
Token: SeIncBasePriorityPrivilege	1700	wmic.exe
Token: SeCreatePagefilePrivilege	1700	wmic.exe
Token: SeBackupPrivilege	1700	wmic.exe
Token: SeRestorePrivilege	1700	wmic.exe
Token: SeShutdownPrivilege	1700	wmic.exe
Token: SeDebugPrivilege	1700	wmic.exe
Token: SeSystemEnvironmentPrivilege	1700	wmic.exe
Token: SeRemoteShutdownPrivilege	1700	wmic.exe
Token: SeUndockPrivilege	1700	wmic.exe
Token: SeManageVolumePrivilege	1700	wmic.exe
Token: 33	1700	wmic.exe
Token: 34	1700	wmic.exe
Token: 35	1700	wmic.exe
Token: SeIncreaseQuotaPrivilege	1252	wmic.exe
Token: SeSecurityPrivilege	1252	wmic.exe
Token: SeTakeOwnershipPrivilege	1252	wmic.exe
Token: SeLoadDriverPrivilege	1252	wmic.exe
Token: SeSystemProfilePrivilege	1252	wmic.exe
Token: SeSystemtimePrivilege	1252	wmic.exe
Token: SeProfSingleProcessPrivilege	1252	wmic.exe
Token: SeIncBasePriorityPrivilege	1252	wmic.exe
Token: SeCreatePagefilePrivilege	1252	wmic.exe
Token: SeBackupPrivilege	1252	wmic.exe
Token: SeRestorePrivilege	1252	wmic.exe
Token: SeShutdownPrivilege	1252	wmic.exe
Token: SeDebugPrivilege	1252	wmic.exe
Token: SeSystemEnvironmentPrivilege	1252	wmic.exe
Token: SeRemoteShutdownPrivilege	1252	wmic.exe
Token: SeUndockPrivilege	1252	wmic.exe
Token: SeManageVolumePrivilege	1252	wmic.exe
Token: 33	1252	wmic.exe
Token: 34	1252	wmic.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 2568 wrote to memory of 2388	2568	umbralstealer.exe	30
PID 2568 wrote to memory of 2388	2568	umbralstealer.exe	30
PID 2568 wrote to memory of 2388	2568	umbralstealer.exe	30
PID 2568 wrote to memory of 2860	2568	umbralstealer.exe	32
PID 2568 wrote to memory of 2860	2568	umbralstealer.exe	32
PID 2568 wrote to memory of 2860	2568	umbralstealer.exe	32
PID 2568 wrote to memory of 2656	2568	umbralstealer.exe	34
PID 2568 wrote to memory of 2656	2568	umbralstealer.exe	34
PID 2568 wrote to memory of 2656	2568	umbralstealer.exe	34
PID 2568 wrote to memory of 2692	2568	umbralstealer.exe	36
PID 2568 wrote to memory of 2692	2568	umbralstealer.exe	36
PID 2568 wrote to memory of 2692	2568	umbralstealer.exe	36
PID 2568 wrote to memory of 1700	2568	umbralstealer.exe	38
PID 2568 wrote to memory of 1700	2568	umbralstealer.exe	38
PID 2568 wrote to memory of 1700	2568	umbralstealer.exe	38
PID 2568 wrote to memory of 1252	2568	umbralstealer.exe	41
PID 2568 wrote to memory of 1252	2568	umbralstealer.exe	41
PID 2568 wrote to memory of 1252	2568	umbralstealer.exe	41
PID 2568 wrote to memory of 696	2568	umbralstealer.exe	43
PID 2568 wrote to memory of 696	2568	umbralstealer.exe	43
PID 2568 wrote to memory of 696	2568	umbralstealer.exe	43
PID 2568 wrote to memory of 2912	2568	umbralstealer.exe	45
PID 2568 wrote to memory of 2912	2568	umbralstealer.exe	45
PID 2568 wrote to memory of 2912	2568	umbralstealer.exe	45
PID 2568 wrote to memory of 1280	2568	umbralstealer.exe	47
PID 2568 wrote to memory of 1280	2568	umbralstealer.exe	47
PID 2568 wrote to memory of 1280	2568	umbralstealer.exe	47

C:\Users\Admin\AppData\Local\Temp\umbralstealer.exe
"C:\Users\Admin\AppData\Local\Temp\umbralstealer.exe"
1⤵
- Drops file in Drivers directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2568
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\umbralstealer.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2388
- 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⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2860
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2656
- 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:2692
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1700
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1252
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:696
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  PID:2912
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:1280

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

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\GEZAWL7SZN5Y6TDGD3FR.temp

Filesize
7KB

MD5
8981a3e6b9ced7539ff73bd8be410bc3

SHA1
62dfcd37bf9fbc863d24d3ad4df434d89841a553

SHA256
beca44435b6cfae210f24a147e7467f13de4826d969fb1ddfe7897f6cc10da8b

SHA512
7d83044c04ad9ef97ebe640c0a490154c08bb3c208d33208df15b3b13cad4b451176e3401cc5df3eb99815e6a8c52f99479e3052814b4ef39bdd0602162da3b7

Download Submit
memory/2388-7-0x000007FEED76E000-0x000007FEED76F000-memory.dmp

Filesize
4KB

Download
memory/2388-8-0x000000001B6E0000-0x000000001B9C2000-memory.dmp

Filesize
2.9MB

Download
memory/2388-9-0x0000000002240000-0x0000000002248000-memory.dmp

Filesize
32KB

Download
memory/2388-10-0x0000000002CF4000-0x0000000002CF7000-memory.dmp

Filesize
12KB

Download
memory/2388-12-0x000007FEED4B0000-0x000007FEEDE4D000-memory.dmp

Filesize
9.6MB

Download
memory/2388-11-0x0000000002CFB000-0x0000000002D62000-memory.dmp

Filesize
412KB

Download
memory/2388-52-0x000007FEED4B0000-0x000007FEEDE4D000-memory.dmp

Filesize
9.6MB

Download
memory/2568-0-0x000007FEF5433000-0x000007FEF5434000-memory.dmp

Filesize
4KB

Download
memory/2568-2-0x000007FEF5430000-0x000007FEF5E1C000-memory.dmp

Filesize
9.9MB

Download
memory/2568-1-0x0000000000070000-0x00000000000B0000-memory.dmp

Filesize
256KB

Download
memory/2568-51-0x000007FEF5430000-0x000007FEF5E1C000-memory.dmp

Filesize
9.9MB

Download
memory/2860-18-0x000000001B6F0000-0x000000001B9D2000-memory.dmp

Filesize
2.9MB

Download
memory/2860-19-0x0000000001D80000-0x0000000001D88000-memory.dmp

Filesize
32KB

Download