umbral | 1d2764e360259d54a4685745c8264295be898a4d208f405702ff2f8a2200114f

Analysis

max time kernel
121s
max time network
121s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
03-02-2025 14:15

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General

Target

CrypticBootstrapper.exe
Size

234KB
MD5

e8ad07562f0bc1b8d7f48f6d5bd40bfc
SHA1

9aec9c702c4a697885edee682fc8602c73da9fa7
SHA256

1d2764e360259d54a4685745c8264295be898a4d208f405702ff2f8a2200114f
SHA512

1c874371239a5e90c35311cbead9474348dbaf3d548c2273c0b2a65e171cd93cc1c8e4f52c3f9c60f3af89dbf2f73743d0fc32980fff0bc0869957fa4670a870
SSDEEP

6144:TloZMLrIkd8g+EtXHkv/iD4AAMXdLocDFabtIExslb8e1mwdIi:RoZ0L+EP8AAMXdLocDFabtIEx4z

Score

10^/10

umbral execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/2396-1-0x0000000001210000-0x0000000001250000-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
2824	powershell.exe
2876	powershell.exe
2672	powershell.exe
1796	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
9	discord.com
10	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
6	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2936	wmic.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2396	CrypticBootstrapper.exe
2824	powershell.exe
2876	powershell.exe
2672	powershell.exe
660	powershell.exe
1796	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2396	CrypticBootstrapper.exe
Token: SeIncreaseQuotaPrivilege	2140	wmic.exe
Token: SeSecurityPrivilege	2140	wmic.exe
Token: SeTakeOwnershipPrivilege	2140	wmic.exe
Token: SeLoadDriverPrivilege	2140	wmic.exe
Token: SeSystemProfilePrivilege	2140	wmic.exe
Token: SeSystemtimePrivilege	2140	wmic.exe
Token: SeProfSingleProcessPrivilege	2140	wmic.exe
Token: SeIncBasePriorityPrivilege	2140	wmic.exe
Token: SeCreatePagefilePrivilege	2140	wmic.exe
Token: SeBackupPrivilege	2140	wmic.exe
Token: SeRestorePrivilege	2140	wmic.exe
Token: SeShutdownPrivilege	2140	wmic.exe
Token: SeDebugPrivilege	2140	wmic.exe
Token: SeSystemEnvironmentPrivilege	2140	wmic.exe
Token: SeRemoteShutdownPrivilege	2140	wmic.exe
Token: SeUndockPrivilege	2140	wmic.exe
Token: SeManageVolumePrivilege	2140	wmic.exe
Token: 33	2140	wmic.exe
Token: 34	2140	wmic.exe
Token: 35	2140	wmic.exe
Token: SeIncreaseQuotaPrivilege	2140	wmic.exe
Token: SeSecurityPrivilege	2140	wmic.exe
Token: SeTakeOwnershipPrivilege	2140	wmic.exe
Token: SeLoadDriverPrivilege	2140	wmic.exe
Token: SeSystemProfilePrivilege	2140	wmic.exe
Token: SeSystemtimePrivilege	2140	wmic.exe
Token: SeProfSingleProcessPrivilege	2140	wmic.exe
Token: SeIncBasePriorityPrivilege	2140	wmic.exe
Token: SeCreatePagefilePrivilege	2140	wmic.exe
Token: SeBackupPrivilege	2140	wmic.exe
Token: SeRestorePrivilege	2140	wmic.exe
Token: SeShutdownPrivilege	2140	wmic.exe
Token: SeDebugPrivilege	2140	wmic.exe
Token: SeSystemEnvironmentPrivilege	2140	wmic.exe
Token: SeRemoteShutdownPrivilege	2140	wmic.exe
Token: SeUndockPrivilege	2140	wmic.exe
Token: SeManageVolumePrivilege	2140	wmic.exe
Token: 33	2140	wmic.exe
Token: 34	2140	wmic.exe
Token: 35	2140	wmic.exe
Token: SeDebugPrivilege	2824	powershell.exe
Token: SeDebugPrivilege	2876	powershell.exe
Token: SeDebugPrivilege	2672	powershell.exe
Token: SeDebugPrivilege	660	powershell.exe
Token: SeIncreaseQuotaPrivilege	1084	wmic.exe
Token: SeSecurityPrivilege	1084	wmic.exe
Token: SeTakeOwnershipPrivilege	1084	wmic.exe
Token: SeLoadDriverPrivilege	1084	wmic.exe
Token: SeSystemProfilePrivilege	1084	wmic.exe
Token: SeSystemtimePrivilege	1084	wmic.exe
Token: SeProfSingleProcessPrivilege	1084	wmic.exe
Token: SeIncBasePriorityPrivilege	1084	wmic.exe
Token: SeCreatePagefilePrivilege	1084	wmic.exe
Token: SeBackupPrivilege	1084	wmic.exe
Token: SeRestorePrivilege	1084	wmic.exe
Token: SeShutdownPrivilege	1084	wmic.exe
Token: SeDebugPrivilege	1084	wmic.exe
Token: SeSystemEnvironmentPrivilege	1084	wmic.exe
Token: SeRemoteShutdownPrivilege	1084	wmic.exe
Token: SeUndockPrivilege	1084	wmic.exe
Token: SeManageVolumePrivilege	1084	wmic.exe
Token: 33	1084	wmic.exe
Token: 34	1084	wmic.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2396 wrote to memory of 2140	2396	CrypticBootstrapper.exe	30
PID 2396 wrote to memory of 2140	2396	CrypticBootstrapper.exe	30
PID 2396 wrote to memory of 2140	2396	CrypticBootstrapper.exe	30
PID 2396 wrote to memory of 2824	2396	CrypticBootstrapper.exe	33
PID 2396 wrote to memory of 2824	2396	CrypticBootstrapper.exe	33
PID 2396 wrote to memory of 2824	2396	CrypticBootstrapper.exe	33
PID 2396 wrote to memory of 2876	2396	CrypticBootstrapper.exe	35
PID 2396 wrote to memory of 2876	2396	CrypticBootstrapper.exe	35
PID 2396 wrote to memory of 2876	2396	CrypticBootstrapper.exe	35
PID 2396 wrote to memory of 2672	2396	CrypticBootstrapper.exe	37
PID 2396 wrote to memory of 2672	2396	CrypticBootstrapper.exe	37
PID 2396 wrote to memory of 2672	2396	CrypticBootstrapper.exe	37
PID 2396 wrote to memory of 660	2396	CrypticBootstrapper.exe	39
PID 2396 wrote to memory of 660	2396	CrypticBootstrapper.exe	39
PID 2396 wrote to memory of 660	2396	CrypticBootstrapper.exe	39
PID 2396 wrote to memory of 1084	2396	CrypticBootstrapper.exe	41
PID 2396 wrote to memory of 1084	2396	CrypticBootstrapper.exe	41
PID 2396 wrote to memory of 1084	2396	CrypticBootstrapper.exe	41
PID 2396 wrote to memory of 376	2396	CrypticBootstrapper.exe	43
PID 2396 wrote to memory of 376	2396	CrypticBootstrapper.exe	43
PID 2396 wrote to memory of 376	2396	CrypticBootstrapper.exe	43
PID 2396 wrote to memory of 2336	2396	CrypticBootstrapper.exe	45
PID 2396 wrote to memory of 2336	2396	CrypticBootstrapper.exe	45
PID 2396 wrote to memory of 2336	2396	CrypticBootstrapper.exe	45
PID 2396 wrote to memory of 1796	2396	CrypticBootstrapper.exe	47
PID 2396 wrote to memory of 1796	2396	CrypticBootstrapper.exe	47
PID 2396 wrote to memory of 1796	2396	CrypticBootstrapper.exe	47
PID 2396 wrote to memory of 2936	2396	CrypticBootstrapper.exe	49
PID 2396 wrote to memory of 2936	2396	CrypticBootstrapper.exe	49
PID 2396 wrote to memory of 2936	2396	CrypticBootstrapper.exe	49

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:2396
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2140
- 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:2824
- 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:2876
- 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:2672
- 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:660
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1084
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:376
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:2336
- 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:1796
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:2936

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

Web Service

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
a9207dca20e9cc7ac69fd7463cae59e2

SHA1
f037195ee7ce2072ed13c4e82ea09ded3b3f9703

SHA256
7d77b4b111fb2c87f3c60133260b254071adb34aac414aa0c0a92a0b814a190f

SHA512
ed69c4e8841618032fc702bcd94e5abcc455aed9036fe584e490eed96c9d8d5bd097f8481b516d8fb6b82428fa610b414d2c5b288d27b41f7a678a0948a4e50f

Download Submit
memory/1796-43-0x0000000001E50000-0x0000000001E58000-memory.dmp

Filesize
32KB

Download
memory/2396-0-0x000007FEF6003000-0x000007FEF6004000-memory.dmp

Filesize
4KB

Download
memory/2396-1-0x0000000001210000-0x0000000001250000-memory.dmp

Filesize
256KB

Download
memory/2396-2-0x000007FEF6000000-0x000007FEF69EC000-memory.dmp

Filesize
9.9MB

Download
memory/2396-47-0x000007FEF6000000-0x000007FEF69EC000-memory.dmp

Filesize
9.9MB

Download
memory/2824-7-0x000000001B740000-0x000000001BA22000-memory.dmp

Filesize
2.9MB

Download
memory/2824-8-0x0000000001D80000-0x0000000001D88000-memory.dmp

Filesize
32KB

Download
memory/2876-14-0x000000001B580000-0x000000001B862000-memory.dmp

Filesize
2.9MB

Download
memory/2876-15-0x0000000001E10000-0x0000000001E18000-memory.dmp

Filesize
32KB

Download