umbral | 95898a7768f940dafb72443fae1572a25a631acb5e7481e0940939f4016db636

Analysis

max time kernel
144s
max time network
149s
platform
windows11-21h2_x64
resource
win11-20240709-en
resource tags

arch:x64arch:x86image:win11-20240709-enlocale:en-usos:windows11-21h2-x64system
submitted
25-07-2024 02:03

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General

Target

Umbral.exe
Size

231KB
MD5

967320916645d064c55bbb046526df05
SHA1

c1a16294e93796b74ec339f4824ca52ed8168bc1
SHA256

95898a7768f940dafb72443fae1572a25a631acb5e7481e0940939f4016db636
SHA512

f9284986eb87df0995311c97a7983988d927379b9403ee01a8db65482a1f457f73b5ae3eb916b42fb4e0bb0496ae52454146d69098b9141dd507f8a82dbd3bdd
SSDEEP

6144:RloZM3rIkd8g+EtXHkv/iD4VVnRLxCqVhQhTuOLzRMb8e1mvii:joZIL+EP8VVnRLxCqVhQhTuOL283

Score

10^/10

umbral execution stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/4652-1-0x00000155B1610000-0x00000155B1650000-memory.dmp	family_umbral

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

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

execution

PowerShell

T1059.001

pid	Process
3164	powershell.exe
2904	powershell.exe
2768	powershell.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
18	discord.com
22	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
7	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
1496	wmic.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3164	powershell.exe
3164	powershell.exe
2904	powershell.exe
2904	powershell.exe
2768	powershell.exe
2768	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	4652	Umbral.exe
Token: SeDebugPrivilege	3164	powershell.exe
Token: SeDebugPrivilege	2904	powershell.exe
Token: SeIncreaseQuotaPrivilege	3364	wmic.exe
Token: SeSecurityPrivilege	3364	wmic.exe
Token: SeTakeOwnershipPrivilege	3364	wmic.exe
Token: SeLoadDriverPrivilege	3364	wmic.exe
Token: SeSystemProfilePrivilege	3364	wmic.exe
Token: SeSystemtimePrivilege	3364	wmic.exe
Token: SeProfSingleProcessPrivilege	3364	wmic.exe
Token: SeIncBasePriorityPrivilege	3364	wmic.exe
Token: SeCreatePagefilePrivilege	3364	wmic.exe
Token: SeBackupPrivilege	3364	wmic.exe
Token: SeRestorePrivilege	3364	wmic.exe
Token: SeShutdownPrivilege	3364	wmic.exe
Token: SeDebugPrivilege	3364	wmic.exe
Token: SeSystemEnvironmentPrivilege	3364	wmic.exe
Token: SeRemoteShutdownPrivilege	3364	wmic.exe
Token: SeUndockPrivilege	3364	wmic.exe
Token: SeManageVolumePrivilege	3364	wmic.exe
Token: 33	3364	wmic.exe
Token: 34	3364	wmic.exe
Token: 35	3364	wmic.exe
Token: 36	3364	wmic.exe
Token: SeIncreaseQuotaPrivilege	3364	wmic.exe
Token: SeSecurityPrivilege	3364	wmic.exe
Token: SeTakeOwnershipPrivilege	3364	wmic.exe
Token: SeLoadDriverPrivilege	3364	wmic.exe
Token: SeSystemProfilePrivilege	3364	wmic.exe
Token: SeSystemtimePrivilege	3364	wmic.exe
Token: SeProfSingleProcessPrivilege	3364	wmic.exe
Token: SeIncBasePriorityPrivilege	3364	wmic.exe
Token: SeCreatePagefilePrivilege	3364	wmic.exe
Token: SeBackupPrivilege	3364	wmic.exe
Token: SeRestorePrivilege	3364	wmic.exe
Token: SeShutdownPrivilege	3364	wmic.exe
Token: SeDebugPrivilege	3364	wmic.exe
Token: SeSystemEnvironmentPrivilege	3364	wmic.exe
Token: SeRemoteShutdownPrivilege	3364	wmic.exe
Token: SeUndockPrivilege	3364	wmic.exe
Token: SeManageVolumePrivilege	3364	wmic.exe
Token: 33	3364	wmic.exe
Token: 34	3364	wmic.exe
Token: 35	3364	wmic.exe
Token: 36	3364	wmic.exe
Token: SeIncreaseQuotaPrivilege	1592	wmic.exe
Token: SeSecurityPrivilege	1592	wmic.exe
Token: SeTakeOwnershipPrivilege	1592	wmic.exe
Token: SeLoadDriverPrivilege	1592	wmic.exe
Token: SeSystemProfilePrivilege	1592	wmic.exe
Token: SeSystemtimePrivilege	1592	wmic.exe
Token: SeProfSingleProcessPrivilege	1592	wmic.exe
Token: SeIncBasePriorityPrivilege	1592	wmic.exe
Token: SeCreatePagefilePrivilege	1592	wmic.exe
Token: SeBackupPrivilege	1592	wmic.exe
Token: SeRestorePrivilege	1592	wmic.exe
Token: SeShutdownPrivilege	1592	wmic.exe
Token: SeDebugPrivilege	1592	wmic.exe
Token: SeSystemEnvironmentPrivilege	1592	wmic.exe
Token: SeRemoteShutdownPrivilege	1592	wmic.exe
Token: SeUndockPrivilege	1592	wmic.exe
Token: SeManageVolumePrivilege	1592	wmic.exe
Token: 33	1592	wmic.exe
Token: 34	1592	wmic.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 4652 wrote to memory of 3164	4652	Umbral.exe	82
PID 4652 wrote to memory of 3164	4652	Umbral.exe	82
PID 4652 wrote to memory of 2904	4652	Umbral.exe	84
PID 4652 wrote to memory of 2904	4652	Umbral.exe	84
PID 4652 wrote to memory of 3364	4652	Umbral.exe	86
PID 4652 wrote to memory of 3364	4652	Umbral.exe	86
PID 4652 wrote to memory of 1592	4652	Umbral.exe	89
PID 4652 wrote to memory of 1592	4652	Umbral.exe	89
PID 4652 wrote to memory of 1772	4652	Umbral.exe	91
PID 4652 wrote to memory of 1772	4652	Umbral.exe	91
PID 4652 wrote to memory of 2768	4652	Umbral.exe	93
PID 4652 wrote to memory of 2768	4652	Umbral.exe	93
PID 4652 wrote to memory of 1496	4652	Umbral.exe	95
PID 4652 wrote to memory of 1496	4652	Umbral.exe	95

C:\Users\Admin\AppData\Local\Temp\Umbral.exe
"C:\Users\Admin\AppData\Local\Temp\Umbral.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4652
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Umbral.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3164
- 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:2904
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3364
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1592
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1772
- 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:2768
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:1496

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

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
627073ee3ca9676911bee35548eff2b8

SHA1
4c4b68c65e2cab9864b51167d710aa29ebdcff2e

SHA256
85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

SHA512
3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

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

Filesize
944B

MD5
1a9fa92a4f2e2ec9e244d43a6a4f8fb9

SHA1
9910190edfaccece1dfcc1d92e357772f5dae8f7

SHA256
0ee052d5333fd5fd86bc84856fec98e045f077a7ac8051651bf7c521b9706888

SHA512
5d2361476fa22200e6f83883efe7dcb8c3fe7dae8d56e04e28a36e9ae1270c327b6aa161d92b239593da7661289d002c574446ecfd6bd19928209aae25e3ef64

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

Filesize
948B

MD5
6bddc96a32b9ed8fc70b141ccf4a39b2

SHA1
0f33c0699da40a5eadcec646791cf21cdb0dd7c6

SHA256
cb3853abe77eb0da8a1caccb49e97a573b6f35570722eb759116a645d724c132

SHA512
e41f1597b4129b759e4199db195df1c24e47cc47dc9850fab2d48e44bc3d37dc3658fbfbb62332a0b93c552587d7fab09de1634f605faa2209b8470c2a6eaca6

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_u54t1g0t.m1z.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/3164-15-0x00007FF950550000-0x00007FF951012000-memory.dmp

Filesize
10.8MB

Download
memory/3164-11-0x000001CAF6F30000-0x000001CAF6F52000-memory.dmp

Filesize
136KB

Download
memory/3164-13-0x00007FF950550000-0x00007FF951012000-memory.dmp

Filesize
10.8MB

Download
memory/3164-14-0x00007FF950550000-0x00007FF951012000-memory.dmp

Filesize
10.8MB

Download
memory/3164-12-0x00007FF950550000-0x00007FF951012000-memory.dmp

Filesize
10.8MB

Download
memory/3164-18-0x00007FF950550000-0x00007FF951012000-memory.dmp

Filesize
10.8MB

Download
memory/4652-2-0x00007FF950550000-0x00007FF951012000-memory.dmp

Filesize
10.8MB

Download
memory/4652-0-0x00007FF950553000-0x00007FF950555000-memory.dmp

Filesize
8KB

Download
memory/4652-31-0x00000155CBDF0000-0x00000155CBE02000-memory.dmp

Filesize
72KB

Download
memory/4652-30-0x00000155CBDB0000-0x00000155CBDBA000-memory.dmp

Filesize
40KB

Download
memory/4652-33-0x00000155CBE90000-0x00000155CBF06000-memory.dmp

Filesize
472KB

Download
memory/4652-34-0x00000155CBE10000-0x00000155CBE2E000-memory.dmp

Filesize
120KB

Download
memory/4652-1-0x00000155B1610000-0x00000155B1650000-memory.dmp

Filesize
256KB

Download
memory/4652-46-0x00007FF950550000-0x00007FF951012000-memory.dmp

Filesize
10.8MB

Download
memory/4652-49-0x00007FF950550000-0x00007FF951012000-memory.dmp

Filesize
10.8MB

Download