umbral | b8e51135b2e0a124ac1103a9c4a6f2353d289ffe99611d990c291ae356950ecf

Analysis

max time kernel
148s
max time network
151s
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 04:38

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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/2420-1-0x000002801A350000-0x000002801A390000-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
2976	powershell.exe
1452	powershell.exe
4568	powershell.exe
2912	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
14	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
3184	wmic.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
2976	powershell.exe
2976	powershell.exe
1452	powershell.exe
1452	powershell.exe
4568	powershell.exe
4568	powershell.exe
4892	powershell.exe
4892	powershell.exe
2912	powershell.exe
2912	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2420	umbralstealer.exe
Token: SeDebugPrivilege	2976	powershell.exe
Token: SeDebugPrivilege	1452	powershell.exe
Token: SeDebugPrivilege	4568	powershell.exe
Token: SeDebugPrivilege	4892	powershell.exe
Token: SeIncreaseQuotaPrivilege	2652	wmic.exe
Token: SeSecurityPrivilege	2652	wmic.exe
Token: SeTakeOwnershipPrivilege	2652	wmic.exe
Token: SeLoadDriverPrivilege	2652	wmic.exe
Token: SeSystemProfilePrivilege	2652	wmic.exe
Token: SeSystemtimePrivilege	2652	wmic.exe
Token: SeProfSingleProcessPrivilege	2652	wmic.exe
Token: SeIncBasePriorityPrivilege	2652	wmic.exe
Token: SeCreatePagefilePrivilege	2652	wmic.exe
Token: SeBackupPrivilege	2652	wmic.exe
Token: SeRestorePrivilege	2652	wmic.exe
Token: SeShutdownPrivilege	2652	wmic.exe
Token: SeDebugPrivilege	2652	wmic.exe
Token: SeSystemEnvironmentPrivilege	2652	wmic.exe
Token: SeRemoteShutdownPrivilege	2652	wmic.exe
Token: SeUndockPrivilege	2652	wmic.exe
Token: SeManageVolumePrivilege	2652	wmic.exe
Token: 33	2652	wmic.exe
Token: 34	2652	wmic.exe
Token: 35	2652	wmic.exe
Token: 36	2652	wmic.exe
Token: SeIncreaseQuotaPrivilege	2652	wmic.exe
Token: SeSecurityPrivilege	2652	wmic.exe
Token: SeTakeOwnershipPrivilege	2652	wmic.exe
Token: SeLoadDriverPrivilege	2652	wmic.exe
Token: SeSystemProfilePrivilege	2652	wmic.exe
Token: SeSystemtimePrivilege	2652	wmic.exe
Token: SeProfSingleProcessPrivilege	2652	wmic.exe
Token: SeIncBasePriorityPrivilege	2652	wmic.exe
Token: SeCreatePagefilePrivilege	2652	wmic.exe
Token: SeBackupPrivilege	2652	wmic.exe
Token: SeRestorePrivilege	2652	wmic.exe
Token: SeShutdownPrivilege	2652	wmic.exe
Token: SeDebugPrivilege	2652	wmic.exe
Token: SeSystemEnvironmentPrivilege	2652	wmic.exe
Token: SeRemoteShutdownPrivilege	2652	wmic.exe
Token: SeUndockPrivilege	2652	wmic.exe
Token: SeManageVolumePrivilege	2652	wmic.exe
Token: 33	2652	wmic.exe
Token: 34	2652	wmic.exe
Token: 35	2652	wmic.exe
Token: 36	2652	wmic.exe
Token: SeIncreaseQuotaPrivilege	1392	wmic.exe
Token: SeSecurityPrivilege	1392	wmic.exe
Token: SeTakeOwnershipPrivilege	1392	wmic.exe
Token: SeLoadDriverPrivilege	1392	wmic.exe
Token: SeSystemProfilePrivilege	1392	wmic.exe
Token: SeSystemtimePrivilege	1392	wmic.exe
Token: SeProfSingleProcessPrivilege	1392	wmic.exe
Token: SeIncBasePriorityPrivilege	1392	wmic.exe
Token: SeCreatePagefilePrivilege	1392	wmic.exe
Token: SeBackupPrivilege	1392	wmic.exe
Token: SeRestorePrivilege	1392	wmic.exe
Token: SeShutdownPrivilege	1392	wmic.exe
Token: SeDebugPrivilege	1392	wmic.exe
Token: SeSystemEnvironmentPrivilege	1392	wmic.exe
Token: SeRemoteShutdownPrivilege	1392	wmic.exe
Token: SeUndockPrivilege	1392	wmic.exe
Token: SeManageVolumePrivilege	1392	wmic.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 2420 wrote to memory of 2976	2420	umbralstealer.exe	85
PID 2420 wrote to memory of 2976	2420	umbralstealer.exe	85
PID 2420 wrote to memory of 1452	2420	umbralstealer.exe	88
PID 2420 wrote to memory of 1452	2420	umbralstealer.exe	88
PID 2420 wrote to memory of 4568	2420	umbralstealer.exe	90
PID 2420 wrote to memory of 4568	2420	umbralstealer.exe	90
PID 2420 wrote to memory of 4892	2420	umbralstealer.exe	92
PID 2420 wrote to memory of 4892	2420	umbralstealer.exe	92
PID 2420 wrote to memory of 2652	2420	umbralstealer.exe	94
PID 2420 wrote to memory of 2652	2420	umbralstealer.exe	94
PID 2420 wrote to memory of 1392	2420	umbralstealer.exe	97
PID 2420 wrote to memory of 1392	2420	umbralstealer.exe	97
PID 2420 wrote to memory of 4440	2420	umbralstealer.exe	99
PID 2420 wrote to memory of 4440	2420	umbralstealer.exe	99
PID 2420 wrote to memory of 2912	2420	umbralstealer.exe	101
PID 2420 wrote to memory of 2912	2420	umbralstealer.exe	101
PID 2420 wrote to memory of 3184	2420	umbralstealer.exe	105
PID 2420 wrote to memory of 3184	2420	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:2420
- 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:2976
- 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:1452
- 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:4568
- 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:4892
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2652
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1392
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:4440
- 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:3184

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
c65738617888921a153bd9b1ef516ee7

SHA1
5245e71ea3c181d76320c857b639272ac9e079b1

SHA256
4640ba4001fd16a593315299cbdd4988dc2c7075820687f1018aac40aca95c26

SHA512
2e2a0ebd93f9d8dd07a7599054bce232683e9add9a35e77b584618040bcfd84a42545352519ec4736cc379002210b6f3ed2d905591c6925c0981b0392b495bfa

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
f16a793e7740ab2e354b93ee3e4e6b98

SHA1
c7f109bff1b9f2a7998e951da035c935ec9dae30

SHA256
99bf17a06ac3063964c9882644e403a58b012ec298b675c6f76ec1f556ad4fb7

SHA512
3a81428795954b9a69f4cd519db6604cfd916dda8a4af2e36cc9ca041d34c60db5463fcc03b1f29398696cb3ac4dcb681befe50d7d2d60c8e565df4d024069ea

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_yv2ewep0.413.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2420-71-0x0000028034A40000-0x0000028034A4A000-memory.dmp

Filesize
40KB

Download
memory/2420-35-0x0000028034A00000-0x0000028034A1E000-memory.dmp

Filesize
120KB

Download
memory/2420-90-0x00007FFFFF520000-0x00007FFFFFFE1000-memory.dmp

Filesize
10.8MB

Download
memory/2420-72-0x0000028035910000-0x0000028035922000-memory.dmp

Filesize
72KB

Download
memory/2420-2-0x00007FFFFF520000-0x00007FFFFFFE1000-memory.dmp

Filesize
10.8MB

Download
memory/2420-33-0x0000028034A70000-0x0000028034AE6000-memory.dmp

Filesize
472KB

Download
memory/2420-34-0x0000028034AF0000-0x0000028034B40000-memory.dmp

Filesize
320KB

Download
memory/2420-0-0x00007FFFFF523000-0x00007FFFFF525000-memory.dmp

Filesize
8KB

Download
memory/2420-1-0x000002801A350000-0x000002801A390000-memory.dmp

Filesize
256KB

Download
memory/2976-15-0x00007FFFFF520000-0x00007FFFFFFE1000-memory.dmp

Filesize
10.8MB

Download
memory/2976-14-0x00007FFFFF520000-0x00007FFFFFFE1000-memory.dmp

Filesize
10.8MB

Download
memory/2976-12-0x000001FA93B60000-0x000001FA93B82000-memory.dmp

Filesize
136KB

Download
memory/2976-13-0x00007FFFFF520000-0x00007FFFFFFE1000-memory.dmp

Filesize
10.8MB

Download
memory/2976-18-0x00007FFFFF520000-0x00007FFFFFFE1000-memory.dmp

Filesize
10.8MB

Download