umbral | 3a1b731d964fa9378d37657812ded01ae6a97b15eb114063555045334eee4c26

Analysis

max time kernel
16s
max time network
17s
platform
windows7_x64
resource
win7-20240705-en
resource tags

arch:x64arch:x86image:win7-20240705-enlocale:en-usos:windows7-x64system
submitted
31-07-2024 15:06

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General

Target

Bootstrapper.exe
Size

494KB
MD5

b80c04df4f7fd690ce34cf65b30ab204
SHA1

c9348af979d56319086f1448d0681def08da6430
SHA256

3a1b731d964fa9378d37657812ded01ae6a97b15eb114063555045334eee4c26
SHA512

04d0f4399141e44a9ba9579e7d161678f5f9ce8f9b9011ed95e5b239256765ea8fbc989bafb75bc428e330e815359633c8b7438cca603b9849da2cc27eb82fc7
SSDEEP

12288:VoZ0L+EP8N6zJW0b3cQNImHHmr0HcPTywWQ+Ples:QI8MzJW0b3cQNImHHmr0iOwWL

Score

10^/10

umbral credential_access execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/2604-1-0x0000000001140000-0x00000000011C2000-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
2900	powershell.exe
2528	powershell.exe
2400	powershell.exe
2016	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	Bootstrapper.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
9	discord.com
10	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
6	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2340	wmic.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2604	Bootstrapper.exe
2900	powershell.exe
2528	powershell.exe
2400	powershell.exe
3008	powershell.exe
2016	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2604	Bootstrapper.exe
Token: SeIncreaseQuotaPrivilege	2668	wmic.exe
Token: SeSecurityPrivilege	2668	wmic.exe
Token: SeTakeOwnershipPrivilege	2668	wmic.exe
Token: SeLoadDriverPrivilege	2668	wmic.exe
Token: SeSystemProfilePrivilege	2668	wmic.exe
Token: SeSystemtimePrivilege	2668	wmic.exe
Token: SeProfSingleProcessPrivilege	2668	wmic.exe
Token: SeIncBasePriorityPrivilege	2668	wmic.exe
Token: SeCreatePagefilePrivilege	2668	wmic.exe
Token: SeBackupPrivilege	2668	wmic.exe
Token: SeRestorePrivilege	2668	wmic.exe
Token: SeShutdownPrivilege	2668	wmic.exe
Token: SeDebugPrivilege	2668	wmic.exe
Token: SeSystemEnvironmentPrivilege	2668	wmic.exe
Token: SeRemoteShutdownPrivilege	2668	wmic.exe
Token: SeUndockPrivilege	2668	wmic.exe
Token: SeManageVolumePrivilege	2668	wmic.exe
Token: 33	2668	wmic.exe
Token: 34	2668	wmic.exe
Token: 35	2668	wmic.exe
Token: SeIncreaseQuotaPrivilege	2668	wmic.exe
Token: SeSecurityPrivilege	2668	wmic.exe
Token: SeTakeOwnershipPrivilege	2668	wmic.exe
Token: SeLoadDriverPrivilege	2668	wmic.exe
Token: SeSystemProfilePrivilege	2668	wmic.exe
Token: SeSystemtimePrivilege	2668	wmic.exe
Token: SeProfSingleProcessPrivilege	2668	wmic.exe
Token: SeIncBasePriorityPrivilege	2668	wmic.exe
Token: SeCreatePagefilePrivilege	2668	wmic.exe
Token: SeBackupPrivilege	2668	wmic.exe
Token: SeRestorePrivilege	2668	wmic.exe
Token: SeShutdownPrivilege	2668	wmic.exe
Token: SeDebugPrivilege	2668	wmic.exe
Token: SeSystemEnvironmentPrivilege	2668	wmic.exe
Token: SeRemoteShutdownPrivilege	2668	wmic.exe
Token: SeUndockPrivilege	2668	wmic.exe
Token: SeManageVolumePrivilege	2668	wmic.exe
Token: 33	2668	wmic.exe
Token: 34	2668	wmic.exe
Token: 35	2668	wmic.exe
Token: SeDebugPrivilege	2900	powershell.exe
Token: SeDebugPrivilege	2528	powershell.exe
Token: SeDebugPrivilege	2400	powershell.exe
Token: SeDebugPrivilege	3008	powershell.exe
Token: SeIncreaseQuotaPrivilege	2752	wmic.exe
Token: SeSecurityPrivilege	2752	wmic.exe
Token: SeTakeOwnershipPrivilege	2752	wmic.exe
Token: SeLoadDriverPrivilege	2752	wmic.exe
Token: SeSystemProfilePrivilege	2752	wmic.exe
Token: SeSystemtimePrivilege	2752	wmic.exe
Token: SeProfSingleProcessPrivilege	2752	wmic.exe
Token: SeIncBasePriorityPrivilege	2752	wmic.exe
Token: SeCreatePagefilePrivilege	2752	wmic.exe
Token: SeBackupPrivilege	2752	wmic.exe
Token: SeRestorePrivilege	2752	wmic.exe
Token: SeShutdownPrivilege	2752	wmic.exe
Token: SeDebugPrivilege	2752	wmic.exe
Token: SeSystemEnvironmentPrivilege	2752	wmic.exe
Token: SeRemoteShutdownPrivilege	2752	wmic.exe
Token: SeUndockPrivilege	2752	wmic.exe
Token: SeManageVolumePrivilege	2752	wmic.exe
Token: 33	2752	wmic.exe
Token: 34	2752	wmic.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2604 wrote to memory of 2668	2604	Bootstrapper.exe	30
PID 2604 wrote to memory of 2668	2604	Bootstrapper.exe	30
PID 2604 wrote to memory of 2668	2604	Bootstrapper.exe	30
PID 2604 wrote to memory of 2900	2604	Bootstrapper.exe	33
PID 2604 wrote to memory of 2900	2604	Bootstrapper.exe	33
PID 2604 wrote to memory of 2900	2604	Bootstrapper.exe	33
PID 2604 wrote to memory of 2528	2604	Bootstrapper.exe	35
PID 2604 wrote to memory of 2528	2604	Bootstrapper.exe	35
PID 2604 wrote to memory of 2528	2604	Bootstrapper.exe	35
PID 2604 wrote to memory of 2400	2604	Bootstrapper.exe	37
PID 2604 wrote to memory of 2400	2604	Bootstrapper.exe	37
PID 2604 wrote to memory of 2400	2604	Bootstrapper.exe	37
PID 2604 wrote to memory of 3008	2604	Bootstrapper.exe	39
PID 2604 wrote to memory of 3008	2604	Bootstrapper.exe	39
PID 2604 wrote to memory of 3008	2604	Bootstrapper.exe	39
PID 2604 wrote to memory of 2752	2604	Bootstrapper.exe	41
PID 2604 wrote to memory of 2752	2604	Bootstrapper.exe	41
PID 2604 wrote to memory of 2752	2604	Bootstrapper.exe	41
PID 2604 wrote to memory of 2804	2604	Bootstrapper.exe	43
PID 2604 wrote to memory of 2804	2604	Bootstrapper.exe	43
PID 2604 wrote to memory of 2804	2604	Bootstrapper.exe	43
PID 2604 wrote to memory of 1148	2604	Bootstrapper.exe	45
PID 2604 wrote to memory of 1148	2604	Bootstrapper.exe	45
PID 2604 wrote to memory of 1148	2604	Bootstrapper.exe	45
PID 2604 wrote to memory of 2016	2604	Bootstrapper.exe	47
PID 2604 wrote to memory of 2016	2604	Bootstrapper.exe	47
PID 2604 wrote to memory of 2016	2604	Bootstrapper.exe	47
PID 2604 wrote to memory of 2340	2604	Bootstrapper.exe	49
PID 2604 wrote to memory of 2340	2604	Bootstrapper.exe	49
PID 2604 wrote to memory of 2340	2604	Bootstrapper.exe	49

C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe
"C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2604
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2668
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2900
- 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:2528
- 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:2400
- 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:3008
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2752
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:2804
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1148
- 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:2016
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:2340

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

Web Service

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
96b321aed29012fb827c35462bea41ee

SHA1
84a40ddf4af69013b04115f690ff7c53eb27c1a3

SHA256
5ce1d7577244bbdb11428fb90ce82a3e3f701b61b69a188c2d750ef30ff370bf

SHA512
1fcf66b619edacdbcc65c6a147a63b255d69376123b27263e8f5b01de2d591316da68ceff1c70276710875f8411b362a3d5a34cdfe4d8cd62608b32a65274f71

Download Submit
memory/2016-44-0x0000000002330000-0x0000000002338000-memory.dmp

Filesize
32KB

Download
memory/2528-14-0x000000001B640000-0x000000001B922000-memory.dmp

Filesize
2.9MB

Download
memory/2528-15-0x0000000002390000-0x0000000002398000-memory.dmp

Filesize
32KB

Download
memory/2604-0-0x000007FEF5783000-0x000007FEF5784000-memory.dmp

Filesize
4KB

Download
memory/2604-1-0x0000000001140000-0x00000000011C2000-memory.dmp

Filesize
520KB

Download
memory/2604-2-0x000007FEF5780000-0x000007FEF616C000-memory.dmp

Filesize
9.9MB

Download
memory/2604-48-0x000007FEF5780000-0x000007FEF616C000-memory.dmp

Filesize
9.9MB

Download
memory/2900-7-0x000000001B680000-0x000000001B962000-memory.dmp

Filesize
2.9MB

Download
memory/2900-8-0x0000000001F40000-0x0000000001F48000-memory.dmp

Filesize
32KB

Download