umbral | c2ca7672dcc37f2d7d1d0a9ebbdd714b54558b3159033a60314599060b69b23e

Analysis

max time kernel
94s
max time network
125s
platform
windows10-2004_x64
resource
win10v2004-20250129-en
resource tags

arch:x64arch:x86image:win10v2004-20250129-enlocale:en-usos:windows10-2004-x64system
submitted
02-02-2025 20:54

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General

Target

CrypticBootstrapper.exe
Size

229KB
MD5

756d710e520f1d3ec62b72cf4174718e
SHA1

956450b12e01a5edbecb995d2d284fc3f22f933d
SHA256

c2ca7672dcc37f2d7d1d0a9ebbdd714b54558b3159033a60314599060b69b23e
SHA512

2572e520eac2e4aca7898d944be108f6b6f3b0eb0ccdc895fa6d4071122832d1c5f72c63ee7c9f9b44e89d8b456af17ef4c5042e4f45ac91bd428ba24f781187
SSDEEP

6144:FloZM+rIkd8g+EtXHkv/iD4oJCllTwk7viTlwsJeImlC8e1mUGDi:HoZtL+EP8aCllTwk7viTlwsJ0C0O

Score

10^/10

umbral discovery execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral2/memory/376-1-0x000001B12BA60000-0x000001B12BAA0000-memory.dmp	family_umbral

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

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
4044	powershell.exe
968	powershell.exe
728	powershell.exe
2260	powershell.exe

Drops file in Drivers directory 1 IoCs

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

Reads user/profile data of web browsers 3 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

Credentials from Web Browsers
T1555.003

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

Web Service

T1102

flow	ioc
27	discord.com
28	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
4	ip-api.com

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
3124	cmd.exe
1736	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2056	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1736	PING.EXE

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
376	CrypticBootstrapper.exe
4044	powershell.exe
4044	powershell.exe
968	powershell.exe
968	powershell.exe
728	powershell.exe
728	powershell.exe
1208	powershell.exe
1208	powershell.exe
2260	powershell.exe
2260	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	376	CrypticBootstrapper.exe
Token: SeIncreaseQuotaPrivilege	4876	wmic.exe
Token: SeSecurityPrivilege	4876	wmic.exe
Token: SeTakeOwnershipPrivilege	4876	wmic.exe
Token: SeLoadDriverPrivilege	4876	wmic.exe
Token: SeSystemProfilePrivilege	4876	wmic.exe
Token: SeSystemtimePrivilege	4876	wmic.exe
Token: SeProfSingleProcessPrivilege	4876	wmic.exe
Token: SeIncBasePriorityPrivilege	4876	wmic.exe
Token: SeCreatePagefilePrivilege	4876	wmic.exe
Token: SeBackupPrivilege	4876	wmic.exe
Token: SeRestorePrivilege	4876	wmic.exe
Token: SeShutdownPrivilege	4876	wmic.exe
Token: SeDebugPrivilege	4876	wmic.exe
Token: SeSystemEnvironmentPrivilege	4876	wmic.exe
Token: SeRemoteShutdownPrivilege	4876	wmic.exe
Token: SeUndockPrivilege	4876	wmic.exe
Token: SeManageVolumePrivilege	4876	wmic.exe
Token: 33	4876	wmic.exe
Token: 34	4876	wmic.exe
Token: 35	4876	wmic.exe
Token: 36	4876	wmic.exe
Token: SeIncreaseQuotaPrivilege	4876	wmic.exe
Token: SeSecurityPrivilege	4876	wmic.exe
Token: SeTakeOwnershipPrivilege	4876	wmic.exe
Token: SeLoadDriverPrivilege	4876	wmic.exe
Token: SeSystemProfilePrivilege	4876	wmic.exe
Token: SeSystemtimePrivilege	4876	wmic.exe
Token: SeProfSingleProcessPrivilege	4876	wmic.exe
Token: SeIncBasePriorityPrivilege	4876	wmic.exe
Token: SeCreatePagefilePrivilege	4876	wmic.exe
Token: SeBackupPrivilege	4876	wmic.exe
Token: SeRestorePrivilege	4876	wmic.exe
Token: SeShutdownPrivilege	4876	wmic.exe
Token: SeDebugPrivilege	4876	wmic.exe
Token: SeSystemEnvironmentPrivilege	4876	wmic.exe
Token: SeRemoteShutdownPrivilege	4876	wmic.exe
Token: SeUndockPrivilege	4876	wmic.exe
Token: SeManageVolumePrivilege	4876	wmic.exe
Token: 33	4876	wmic.exe
Token: 34	4876	wmic.exe
Token: 35	4876	wmic.exe
Token: 36	4876	wmic.exe
Token: SeDebugPrivilege	4044	powershell.exe
Token: SeDebugPrivilege	968	powershell.exe
Token: SeDebugPrivilege	728	powershell.exe
Token: SeDebugPrivilege	1208	powershell.exe
Token: SeIncreaseQuotaPrivilege	2132	wmic.exe
Token: SeSecurityPrivilege	2132	wmic.exe
Token: SeTakeOwnershipPrivilege	2132	wmic.exe
Token: SeLoadDriverPrivilege	2132	wmic.exe
Token: SeSystemProfilePrivilege	2132	wmic.exe
Token: SeSystemtimePrivilege	2132	wmic.exe
Token: SeProfSingleProcessPrivilege	2132	wmic.exe
Token: SeIncBasePriorityPrivilege	2132	wmic.exe
Token: SeCreatePagefilePrivilege	2132	wmic.exe
Token: SeBackupPrivilege	2132	wmic.exe
Token: SeRestorePrivilege	2132	wmic.exe
Token: SeShutdownPrivilege	2132	wmic.exe
Token: SeDebugPrivilege	2132	wmic.exe
Token: SeSystemEnvironmentPrivilege	2132	wmic.exe
Token: SeRemoteShutdownPrivilege	2132	wmic.exe
Token: SeUndockPrivilege	2132	wmic.exe
Token: SeManageVolumePrivilege	2132	wmic.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 376 wrote to memory of 4876	376	CrypticBootstrapper.exe	85
PID 376 wrote to memory of 4876	376	CrypticBootstrapper.exe	85
PID 376 wrote to memory of 3124	376	CrypticBootstrapper.exe	112
PID 376 wrote to memory of 3124	376	CrypticBootstrapper.exe	112
PID 376 wrote to memory of 4044	376	CrypticBootstrapper.exe	92
PID 376 wrote to memory of 4044	376	CrypticBootstrapper.exe	92
PID 376 wrote to memory of 968	376	CrypticBootstrapper.exe	94
PID 376 wrote to memory of 968	376	CrypticBootstrapper.exe	94
PID 376 wrote to memory of 728	376	CrypticBootstrapper.exe	96
PID 376 wrote to memory of 728	376	CrypticBootstrapper.exe	96
PID 376 wrote to memory of 1208	376	CrypticBootstrapper.exe	98
PID 376 wrote to memory of 1208	376	CrypticBootstrapper.exe	98
PID 376 wrote to memory of 2132	376	CrypticBootstrapper.exe	101
PID 376 wrote to memory of 2132	376	CrypticBootstrapper.exe	101
PID 376 wrote to memory of 4124	376	CrypticBootstrapper.exe	103
PID 376 wrote to memory of 4124	376	CrypticBootstrapper.exe	103
PID 376 wrote to memory of 1840	376	CrypticBootstrapper.exe	105
PID 376 wrote to memory of 1840	376	CrypticBootstrapper.exe	105
PID 376 wrote to memory of 2260	376	CrypticBootstrapper.exe	107
PID 376 wrote to memory of 2260	376	CrypticBootstrapper.exe	107
PID 376 wrote to memory of 2056	376	CrypticBootstrapper.exe	109
PID 376 wrote to memory of 2056	376	CrypticBootstrapper.exe	109
PID 376 wrote to memory of 3124	376	CrypticBootstrapper.exe	112
PID 376 wrote to memory of 3124	376	CrypticBootstrapper.exe	112
PID 3124 wrote to memory of 1736	3124	cmd.exe	114
PID 3124 wrote to memory of 1736	3124	cmd.exe	114

Views/modifies file attributes 1 TTPs 1 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
3124	attrib.exe

C:\Users\Admin\AppData\Local\Temp\CrypticBootstrapper.exe
"C:\Users\Admin\AppData\Local\Temp\CrypticBootstrapper.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:376
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4876
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\CrypticBootstrapper.exe"
  2⤵
  - Views/modifies file attributes
  PID:3124
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\CrypticBootstrapper.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4044
- 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:968
- 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:728
- 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:1208
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2132
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:4124
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1840
- 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:2260
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:2056
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\CrypticBootstrapper.exe" && pause
  2⤵
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:3124
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:1736

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

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Data from Local System

T1005

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
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
966914e2e771de7a4a57a95b6ecfa8a9

SHA1
7a32282fd51dd032967ed4d9a40cc57e265aeff2

SHA256
98d3c70d7004fa807897317bd6cd3e977b9b6c72d4d2565aca0f9f8b1c315cba

SHA512
dc39c7124a9c7c8d4c7e8e16290c46360b8d9a8f4e43edaacbbeb09bdcf20159a53db54d2b322372001b6a3de52b2f88e9088b5fdbc7638816ae0d122bb015f5

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

Filesize
1KB

MD5
548dd08570d121a65e82abb7171cae1c

SHA1
1a1b5084b3a78f3acd0d811cc79dbcac121217ab

SHA256
cdf17b8532ebcebac3cfe23954a30aa32edd268d040da79c82687e4ccb044adc

SHA512
37b98b09178b51eec9599af90d027d2f1028202efc1633047e16e41f1a95610984af5620baac07db085ccfcb96942aafffad17aa1f44f63233e83869dc9f697b

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

Filesize
1KB

MD5
6317adf4fbc43ea2fd68861fafd57155

SHA1
6b87c718893c83c6eed2767e8d9cbc6443e31913

SHA256
c1ead17eef37b4b461cedc276504a441489e819c7f943037f2001966aeec90af

SHA512
17229aae8622e4bfc3caaac55684f7d4ccd3162af5919c851b1d8ac4060b6bb7b75044ecee116523d05acb55197dcb60780958f629450edef386f1e6f65f49f0

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_a4bdbnyz.sgs.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/376-72-0x000001B146220000-0x000001B146232000-memory.dmp

Filesize
72KB

Download
memory/376-35-0x000001B146280000-0x000001B14629E000-memory.dmp

Filesize
120KB

Download
memory/376-90-0x00007FFAAFBF0000-0x00007FFAB06B1000-memory.dmp

Filesize
10.8MB

Download
memory/376-71-0x000001B146110000-0x000001B14611A000-memory.dmp

Filesize
40KB

Download
memory/376-2-0x00007FFAAFBF0000-0x00007FFAB06B1000-memory.dmp

Filesize
10.8MB

Download
memory/376-33-0x000001B1461A0000-0x000001B146216000-memory.dmp

Filesize
472KB

Download
memory/376-34-0x000001B146140000-0x000001B146190000-memory.dmp

Filesize
320KB

Download
memory/376-0-0x00007FFAAFBF3000-0x00007FFAAFBF5000-memory.dmp

Filesize
8KB

Download
memory/376-1-0x000001B12BA60000-0x000001B12BAA0000-memory.dmp

Filesize
256KB

Download
memory/4044-15-0x00007FFAAFBF0000-0x00007FFAB06B1000-memory.dmp

Filesize
10.8MB

Download
memory/4044-5-0x0000021751940000-0x0000021751962000-memory.dmp

Filesize
136KB

Download
memory/4044-14-0x00007FFAAFBF0000-0x00007FFAB06B1000-memory.dmp

Filesize
10.8MB

Download
memory/4044-13-0x00007FFAAFBF0000-0x00007FFAB06B1000-memory.dmp

Filesize
10.8MB

Download
memory/4044-18-0x00007FFAAFBF0000-0x00007FFAB06B1000-memory.dmp

Filesize
10.8MB

Download