umbral | b1256cc222fc9da457e57ce11a874e59d5c731c2aa3f55cc02cf47a9786fc775

Analysis

max time kernel
119s
max time network
120s
platform
windows7_x64
resource
win7-20240704-en
resource tags

arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system
submitted
24-08-2024 21:49

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General

Target

CVW3NAX.exe
Size

428KB
MD5

11710cd62e4fb19bb1932e06d0d64d07
SHA1

807d0d38932792b545ff9fb6fe0d84ddd7094cd8
SHA256

b1256cc222fc9da457e57ce11a874e59d5c731c2aa3f55cc02cf47a9786fc775
SHA512

5a9745ac347c742ea065b9754646dbc718ad6b8e940727c6d7d6632202c1b56649c646ad549cb1406b7c57901aa9ed574ac97e8a47abf63befa3bbebc35f17e5
SSDEEP

12288:noZetlRk83MlSFLPMS1Nmezus9x4FM+H5X:r5r3VLPMS1Nmezus9x4FX

Score

10^/10

umbral credential_access execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/2520-1-0x0000000000860000-0x00000000008D0000-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
2868	powershell.exe
2628	powershell.exe
3048	powershell.exe
1236	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	CVW3NAX.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
756	wmic.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2520	CVW3NAX.exe
2868	powershell.exe
2628	powershell.exe
3048	powershell.exe
380	powershell.exe
1236	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2520	CVW3NAX.exe
Token: SeIncreaseQuotaPrivilege	2932	wmic.exe
Token: SeSecurityPrivilege	2932	wmic.exe
Token: SeTakeOwnershipPrivilege	2932	wmic.exe
Token: SeLoadDriverPrivilege	2932	wmic.exe
Token: SeSystemProfilePrivilege	2932	wmic.exe
Token: SeSystemtimePrivilege	2932	wmic.exe
Token: SeProfSingleProcessPrivilege	2932	wmic.exe
Token: SeIncBasePriorityPrivilege	2932	wmic.exe
Token: SeCreatePagefilePrivilege	2932	wmic.exe
Token: SeBackupPrivilege	2932	wmic.exe
Token: SeRestorePrivilege	2932	wmic.exe
Token: SeShutdownPrivilege	2932	wmic.exe
Token: SeDebugPrivilege	2932	wmic.exe
Token: SeSystemEnvironmentPrivilege	2932	wmic.exe
Token: SeRemoteShutdownPrivilege	2932	wmic.exe
Token: SeUndockPrivilege	2932	wmic.exe
Token: SeManageVolumePrivilege	2932	wmic.exe
Token: 33	2932	wmic.exe
Token: 34	2932	wmic.exe
Token: 35	2932	wmic.exe
Token: SeIncreaseQuotaPrivilege	2932	wmic.exe
Token: SeSecurityPrivilege	2932	wmic.exe
Token: SeTakeOwnershipPrivilege	2932	wmic.exe
Token: SeLoadDriverPrivilege	2932	wmic.exe
Token: SeSystemProfilePrivilege	2932	wmic.exe
Token: SeSystemtimePrivilege	2932	wmic.exe
Token: SeProfSingleProcessPrivilege	2932	wmic.exe
Token: SeIncBasePriorityPrivilege	2932	wmic.exe
Token: SeCreatePagefilePrivilege	2932	wmic.exe
Token: SeBackupPrivilege	2932	wmic.exe
Token: SeRestorePrivilege	2932	wmic.exe
Token: SeShutdownPrivilege	2932	wmic.exe
Token: SeDebugPrivilege	2932	wmic.exe
Token: SeSystemEnvironmentPrivilege	2932	wmic.exe
Token: SeRemoteShutdownPrivilege	2932	wmic.exe
Token: SeUndockPrivilege	2932	wmic.exe
Token: SeManageVolumePrivilege	2932	wmic.exe
Token: 33	2932	wmic.exe
Token: 34	2932	wmic.exe
Token: 35	2932	wmic.exe
Token: SeDebugPrivilege	2868	powershell.exe
Token: SeDebugPrivilege	2628	powershell.exe
Token: SeDebugPrivilege	3048	powershell.exe
Token: SeDebugPrivilege	380	powershell.exe
Token: SeIncreaseQuotaPrivilege	1940	wmic.exe
Token: SeSecurityPrivilege	1940	wmic.exe
Token: SeTakeOwnershipPrivilege	1940	wmic.exe
Token: SeLoadDriverPrivilege	1940	wmic.exe
Token: SeSystemProfilePrivilege	1940	wmic.exe
Token: SeSystemtimePrivilege	1940	wmic.exe
Token: SeProfSingleProcessPrivilege	1940	wmic.exe
Token: SeIncBasePriorityPrivilege	1940	wmic.exe
Token: SeCreatePagefilePrivilege	1940	wmic.exe
Token: SeBackupPrivilege	1940	wmic.exe
Token: SeRestorePrivilege	1940	wmic.exe
Token: SeShutdownPrivilege	1940	wmic.exe
Token: SeDebugPrivilege	1940	wmic.exe
Token: SeSystemEnvironmentPrivilege	1940	wmic.exe
Token: SeRemoteShutdownPrivilege	1940	wmic.exe
Token: SeUndockPrivilege	1940	wmic.exe
Token: SeManageVolumePrivilege	1940	wmic.exe
Token: 33	1940	wmic.exe
Token: 34	1940	wmic.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2520 wrote to memory of 2932	2520	CVW3NAX.exe	30
PID 2520 wrote to memory of 2932	2520	CVW3NAX.exe	30
PID 2520 wrote to memory of 2932	2520	CVW3NAX.exe	30
PID 2520 wrote to memory of 2868	2520	CVW3NAX.exe	33
PID 2520 wrote to memory of 2868	2520	CVW3NAX.exe	33
PID 2520 wrote to memory of 2868	2520	CVW3NAX.exe	33
PID 2520 wrote to memory of 2628	2520	CVW3NAX.exe	35
PID 2520 wrote to memory of 2628	2520	CVW3NAX.exe	35
PID 2520 wrote to memory of 2628	2520	CVW3NAX.exe	35
PID 2520 wrote to memory of 3048	2520	CVW3NAX.exe	37
PID 2520 wrote to memory of 3048	2520	CVW3NAX.exe	37
PID 2520 wrote to memory of 3048	2520	CVW3NAX.exe	37
PID 2520 wrote to memory of 380	2520	CVW3NAX.exe	39
PID 2520 wrote to memory of 380	2520	CVW3NAX.exe	39
PID 2520 wrote to memory of 380	2520	CVW3NAX.exe	39
PID 2520 wrote to memory of 1940	2520	CVW3NAX.exe	41
PID 2520 wrote to memory of 1940	2520	CVW3NAX.exe	41
PID 2520 wrote to memory of 1940	2520	CVW3NAX.exe	41
PID 2520 wrote to memory of 2968	2520	CVW3NAX.exe	43
PID 2520 wrote to memory of 2968	2520	CVW3NAX.exe	43
PID 2520 wrote to memory of 2968	2520	CVW3NAX.exe	43
PID 2520 wrote to memory of 2376	2520	CVW3NAX.exe	45
PID 2520 wrote to memory of 2376	2520	CVW3NAX.exe	45
PID 2520 wrote to memory of 2376	2520	CVW3NAX.exe	45
PID 2520 wrote to memory of 1236	2520	CVW3NAX.exe	47
PID 2520 wrote to memory of 1236	2520	CVW3NAX.exe	47
PID 2520 wrote to memory of 1236	2520	CVW3NAX.exe	47
PID 2520 wrote to memory of 756	2520	CVW3NAX.exe	49
PID 2520 wrote to memory of 756	2520	CVW3NAX.exe	49
PID 2520 wrote to memory of 756	2520	CVW3NAX.exe	49

C:\Users\Admin\AppData\Local\Temp\CVW3NAX.exe
"C:\Users\Admin\AppData\Local\Temp\CVW3NAX.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2520
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2932
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\CVW3NAX.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2868
- 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:2628
- 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:3048
- 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:380
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1940
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:2968
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:2376
- 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:1236
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:756

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\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
d7dc368abf02c89e4178c8a6a205a538

SHA1
237554eb677cf85b46d30380453e289cede111c4

SHA256
63c621a256c39f698eb75f64823582649268fb94f0b5cae801d7a942431d46c1

SHA512
01aea2ee587c2190c3848e31c297e2615e3d7697574e1bd9172d8c6ee1922d03ae923276ee824f3a33af4b382b2a6131ceb344891a68bbe854c1f30c72e32aea

Download Submit
memory/1236-46-0x0000000001D90000-0x0000000001D98000-memory.dmp

Filesize
32KB

Download
memory/2520-0-0x000007FEF4CD3000-0x000007FEF4CD4000-memory.dmp

Filesize
4KB

Download
memory/2520-1-0x0000000000860000-0x00000000008D0000-memory.dmp

Filesize
448KB

Download
memory/2520-2-0x000007FEF4CD0000-0x000007FEF56BC000-memory.dmp

Filesize
9.9MB

Download
memory/2520-3-0x000007FEF4CD3000-0x000007FEF4CD4000-memory.dmp

Filesize
4KB

Download
memory/2520-4-0x000007FEF4CD0000-0x000007FEF56BC000-memory.dmp

Filesize
9.9MB

Download
memory/2520-50-0x000007FEF4CD0000-0x000007FEF56BC000-memory.dmp

Filesize
9.9MB

Download
memory/2628-17-0x0000000002250000-0x0000000002258000-memory.dmp

Filesize
32KB

Download
memory/2628-16-0x000000001B6E0000-0x000000001B9C2000-memory.dmp

Filesize
2.9MB

Download
memory/2868-10-0x0000000002720000-0x0000000002728000-memory.dmp

Filesize
32KB

Download
memory/2868-9-0x000000001B4D0000-0x000000001B7B2000-memory.dmp

Filesize
2.9MB

Download