umbral | b8e51135b2e0a124ac1103a9c4a6f2353d289ffe99611d990c291ae356950ecf

Analysis

max time kernel
95s
max time network
134s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-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
behavioral2/memory/2560-1-0x000002A415A00000-0x000002A415A40000-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
2020	powershell.exe
1096	powershell.exe
216	powershell.exe
4248	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
18	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
64	wmic.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
2020	powershell.exe
2020	powershell.exe
1096	powershell.exe
1096	powershell.exe
216	powershell.exe
216	powershell.exe
3688	powershell.exe
3688	powershell.exe
4248	powershell.exe
4248	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2560	umbralstealer.exe
Token: SeDebugPrivilege	2020	powershell.exe
Token: SeDebugPrivilege	1096	powershell.exe
Token: SeDebugPrivilege	216	powershell.exe
Token: SeDebugPrivilege	3688	powershell.exe
Token: SeIncreaseQuotaPrivilege	3544	wmic.exe
Token: SeSecurityPrivilege	3544	wmic.exe
Token: SeTakeOwnershipPrivilege	3544	wmic.exe
Token: SeLoadDriverPrivilege	3544	wmic.exe
Token: SeSystemProfilePrivilege	3544	wmic.exe
Token: SeSystemtimePrivilege	3544	wmic.exe
Token: SeProfSingleProcessPrivilege	3544	wmic.exe
Token: SeIncBasePriorityPrivilege	3544	wmic.exe
Token: SeCreatePagefilePrivilege	3544	wmic.exe
Token: SeBackupPrivilege	3544	wmic.exe
Token: SeRestorePrivilege	3544	wmic.exe
Token: SeShutdownPrivilege	3544	wmic.exe
Token: SeDebugPrivilege	3544	wmic.exe
Token: SeSystemEnvironmentPrivilege	3544	wmic.exe
Token: SeRemoteShutdownPrivilege	3544	wmic.exe
Token: SeUndockPrivilege	3544	wmic.exe
Token: SeManageVolumePrivilege	3544	wmic.exe
Token: 33	3544	wmic.exe
Token: 34	3544	wmic.exe
Token: 35	3544	wmic.exe
Token: 36	3544	wmic.exe
Token: SeIncreaseQuotaPrivilege	3544	wmic.exe
Token: SeSecurityPrivilege	3544	wmic.exe
Token: SeTakeOwnershipPrivilege	3544	wmic.exe
Token: SeLoadDriverPrivilege	3544	wmic.exe
Token: SeSystemProfilePrivilege	3544	wmic.exe
Token: SeSystemtimePrivilege	3544	wmic.exe
Token: SeProfSingleProcessPrivilege	3544	wmic.exe
Token: SeIncBasePriorityPrivilege	3544	wmic.exe
Token: SeCreatePagefilePrivilege	3544	wmic.exe
Token: SeBackupPrivilege	3544	wmic.exe
Token: SeRestorePrivilege	3544	wmic.exe
Token: SeShutdownPrivilege	3544	wmic.exe
Token: SeDebugPrivilege	3544	wmic.exe
Token: SeSystemEnvironmentPrivilege	3544	wmic.exe
Token: SeRemoteShutdownPrivilege	3544	wmic.exe
Token: SeUndockPrivilege	3544	wmic.exe
Token: SeManageVolumePrivilege	3544	wmic.exe
Token: 33	3544	wmic.exe
Token: 34	3544	wmic.exe
Token: 35	3544	wmic.exe
Token: 36	3544	wmic.exe
Token: SeIncreaseQuotaPrivilege	1424	wmic.exe
Token: SeSecurityPrivilege	1424	wmic.exe
Token: SeTakeOwnershipPrivilege	1424	wmic.exe
Token: SeLoadDriverPrivilege	1424	wmic.exe
Token: SeSystemProfilePrivilege	1424	wmic.exe
Token: SeSystemtimePrivilege	1424	wmic.exe
Token: SeProfSingleProcessPrivilege	1424	wmic.exe
Token: SeIncBasePriorityPrivilege	1424	wmic.exe
Token: SeCreatePagefilePrivilege	1424	wmic.exe
Token: SeBackupPrivilege	1424	wmic.exe
Token: SeRestorePrivilege	1424	wmic.exe
Token: SeShutdownPrivilege	1424	wmic.exe
Token: SeDebugPrivilege	1424	wmic.exe
Token: SeSystemEnvironmentPrivilege	1424	wmic.exe
Token: SeRemoteShutdownPrivilege	1424	wmic.exe
Token: SeUndockPrivilege	1424	wmic.exe
Token: SeManageVolumePrivilege	1424	wmic.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 2560 wrote to memory of 2020	2560	umbralstealer.exe	83
PID 2560 wrote to memory of 2020	2560	umbralstealer.exe	83
PID 2560 wrote to memory of 1096	2560	umbralstealer.exe	86
PID 2560 wrote to memory of 1096	2560	umbralstealer.exe	86
PID 2560 wrote to memory of 216	2560	umbralstealer.exe	90
PID 2560 wrote to memory of 216	2560	umbralstealer.exe	90
PID 2560 wrote to memory of 3688	2560	umbralstealer.exe	92
PID 2560 wrote to memory of 3688	2560	umbralstealer.exe	92
PID 2560 wrote to memory of 3544	2560	umbralstealer.exe	94
PID 2560 wrote to memory of 3544	2560	umbralstealer.exe	94
PID 2560 wrote to memory of 1424	2560	umbralstealer.exe	97
PID 2560 wrote to memory of 1424	2560	umbralstealer.exe	97
PID 2560 wrote to memory of 1184	2560	umbralstealer.exe	101
PID 2560 wrote to memory of 1184	2560	umbralstealer.exe	101
PID 2560 wrote to memory of 4248	2560	umbralstealer.exe	103
PID 2560 wrote to memory of 4248	2560	umbralstealer.exe	103
PID 2560 wrote to memory of 64	2560	umbralstealer.exe	105
PID 2560 wrote to memory of 64	2560	umbralstealer.exe	105

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:2560
- 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:2020
- 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:1096
- 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:216
- 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:3688
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3544
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1424
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1184
- 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:4248
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:64

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\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

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

Filesize
944B

MD5
77d622bb1a5b250869a3238b9bc1402b

SHA1
d47f4003c2554b9dfc4c16f22460b331886b191b

SHA256
f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb

SHA512
d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

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

Filesize
948B

MD5
07d142044fb78e359c794180a9c6fdff

SHA1
8a7155f93a53ff1b7f382a4ccb3f58ff2f88808e

SHA256
2af8c3ca529953085ca25f69d9142964e2ce5508665c14f3533a47d254fed3ea

SHA512
356edd3598c09b765c3de325bc47c5c8ae7fcfd87e8c58e12e8bb6437f1d7ce58310e06c4d64336815833e280f2e61c288edb09508c4f29876d28b0d602aeb78

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

Filesize
1KB

MD5
276798eeb29a49dc6e199768bc9c2e71

SHA1
5fdc8ccb897ac2df7476fbb07517aca5b7a6205b

SHA256
cd0a1056e8f1b6cb5cb328532239d802f4e2aa8f8fcdc0fcb487684bd68e0dcc

SHA512
0d34fce64bbefc57d64fa6e03ca886952263d5f24df9c1c4cce6a1e8f5a47a9a21e9820f8d38caa7f7b43a52336ce00b738ea18419aaa7c788b72e04ce19e4f2

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

Filesize
1KB

MD5
ec79fae4e7c09310ebf4f2d85a33a638

SHA1
f2bdd995b12e65e7ed437d228f22223b59e76efb

SHA256
e9c4723a5fe34e081c3d2f548a1d472394cc7aa58056fcf44ca542061381243a

SHA512
af9dda12f6bb388d826fe03a4a8beed9bda23a978aa55a2af6a43271660ee896a7ee3bcf2c4d2f1e6180902791d8c23560f1c2ec097a501d8c6f4f6c49075625

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_zjgyhx3f.dd4.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2020-13-0x00007FFBC6D00000-0x00007FFBC77C1000-memory.dmp

Filesize
10.8MB

Download
memory/2020-14-0x00007FFBC6D00000-0x00007FFBC77C1000-memory.dmp

Filesize
10.8MB

Download
memory/2020-15-0x00007FFBC6D00000-0x00007FFBC77C1000-memory.dmp

Filesize
10.8MB

Download
memory/2020-18-0x00007FFBC6D00000-0x00007FFBC77C1000-memory.dmp

Filesize
10.8MB

Download
memory/2020-3-0x000002127F940000-0x000002127F962000-memory.dmp

Filesize
136KB

Download
memory/2560-34-0x000002A430130000-0x000002A430180000-memory.dmp

Filesize
320KB

Download
memory/2560-33-0x000002A4301A0000-0x000002A430216000-memory.dmp

Filesize
472KB

Download
memory/2560-35-0x000002A417890000-0x000002A4178AE000-memory.dmp

Filesize
120KB

Download
memory/2560-1-0x000002A415A00000-0x000002A415A40000-memory.dmp

Filesize
256KB

Download
memory/2560-0-0x00007FFBC6D03000-0x00007FFBC6D05000-memory.dmp

Filesize
8KB

Download
memory/2560-71-0x000002A4178C0000-0x000002A4178CA000-memory.dmp

Filesize
40KB

Download
memory/2560-72-0x000002A417900000-0x000002A417912000-memory.dmp

Filesize
72KB

Download
memory/2560-2-0x00007FFBC6D00000-0x00007FFBC77C1000-memory.dmp

Filesize
10.8MB

Download
memory/2560-90-0x00007FFBC6D00000-0x00007FFBC77C1000-memory.dmp

Filesize
10.8MB

Download