umbral | 2c00e70fba3fc1ba12f7651d73a23c1294c684c507742c754f9460ecdcdf5fc6

Analysis

max time kernel
118s
max time network
118s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
03-02-2025 16:50

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General

Target

CrypticBootstrapper.exe
Size

235KB
MD5

6ead93b6a9556b1fb06864131b2f5593
SHA1

fa1b1a247aa197036c94667e9f3c0ed8d79a22bc
SHA256

2c00e70fba3fc1ba12f7651d73a23c1294c684c507742c754f9460ecdcdf5fc6
SHA512

8a388cdcb275afd74b1f7320f8d0882847ae88a949924603022e7e7c6dd855f8004166119f7f3a9aff54ff83ce0264dd25d17338071e4137e6a25a5ce2764202
SSDEEP

6144:rloZMLrIkd8g+EtXHkv/iD4HbmedLocDXabtIExfHb8e1mILKpi:poZ0L+EP8HbmedLocDXabtIExrfKw

Score

10^/10

umbral execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/1980-1-0x0000000000A80000-0x0000000000AC0000-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
1908	powershell.exe
2880	powershell.exe
2824	powershell.exe
2804	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
2104	wmic.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1980	CrypticBootstrapper.exe
1908	powershell.exe
2880	powershell.exe
2824	powershell.exe
572	powershell.exe
2804	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	1980	CrypticBootstrapper.exe
Token: SeIncreaseQuotaPrivilege	2516	wmic.exe
Token: SeSecurityPrivilege	2516	wmic.exe
Token: SeTakeOwnershipPrivilege	2516	wmic.exe
Token: SeLoadDriverPrivilege	2516	wmic.exe
Token: SeSystemProfilePrivilege	2516	wmic.exe
Token: SeSystemtimePrivilege	2516	wmic.exe
Token: SeProfSingleProcessPrivilege	2516	wmic.exe
Token: SeIncBasePriorityPrivilege	2516	wmic.exe
Token: SeCreatePagefilePrivilege	2516	wmic.exe
Token: SeBackupPrivilege	2516	wmic.exe
Token: SeRestorePrivilege	2516	wmic.exe
Token: SeShutdownPrivilege	2516	wmic.exe
Token: SeDebugPrivilege	2516	wmic.exe
Token: SeSystemEnvironmentPrivilege	2516	wmic.exe
Token: SeRemoteShutdownPrivilege	2516	wmic.exe
Token: SeUndockPrivilege	2516	wmic.exe
Token: SeManageVolumePrivilege	2516	wmic.exe
Token: 33	2516	wmic.exe
Token: 34	2516	wmic.exe
Token: 35	2516	wmic.exe
Token: SeIncreaseQuotaPrivilege	2516	wmic.exe
Token: SeSecurityPrivilege	2516	wmic.exe
Token: SeTakeOwnershipPrivilege	2516	wmic.exe
Token: SeLoadDriverPrivilege	2516	wmic.exe
Token: SeSystemProfilePrivilege	2516	wmic.exe
Token: SeSystemtimePrivilege	2516	wmic.exe
Token: SeProfSingleProcessPrivilege	2516	wmic.exe
Token: SeIncBasePriorityPrivilege	2516	wmic.exe
Token: SeCreatePagefilePrivilege	2516	wmic.exe
Token: SeBackupPrivilege	2516	wmic.exe
Token: SeRestorePrivilege	2516	wmic.exe
Token: SeShutdownPrivilege	2516	wmic.exe
Token: SeDebugPrivilege	2516	wmic.exe
Token: SeSystemEnvironmentPrivilege	2516	wmic.exe
Token: SeRemoteShutdownPrivilege	2516	wmic.exe
Token: SeUndockPrivilege	2516	wmic.exe
Token: SeManageVolumePrivilege	2516	wmic.exe
Token: 33	2516	wmic.exe
Token: 34	2516	wmic.exe
Token: 35	2516	wmic.exe
Token: SeDebugPrivilege	1908	powershell.exe
Token: SeDebugPrivilege	2880	powershell.exe
Token: SeDebugPrivilege	2824	powershell.exe
Token: SeDebugPrivilege	572	powershell.exe
Token: SeIncreaseQuotaPrivilege	3036	wmic.exe
Token: SeSecurityPrivilege	3036	wmic.exe
Token: SeTakeOwnershipPrivilege	3036	wmic.exe
Token: SeLoadDriverPrivilege	3036	wmic.exe
Token: SeSystemProfilePrivilege	3036	wmic.exe
Token: SeSystemtimePrivilege	3036	wmic.exe
Token: SeProfSingleProcessPrivilege	3036	wmic.exe
Token: SeIncBasePriorityPrivilege	3036	wmic.exe
Token: SeCreatePagefilePrivilege	3036	wmic.exe
Token: SeBackupPrivilege	3036	wmic.exe
Token: SeRestorePrivilege	3036	wmic.exe
Token: SeShutdownPrivilege	3036	wmic.exe
Token: SeDebugPrivilege	3036	wmic.exe
Token: SeSystemEnvironmentPrivilege	3036	wmic.exe
Token: SeRemoteShutdownPrivilege	3036	wmic.exe
Token: SeUndockPrivilege	3036	wmic.exe
Token: SeManageVolumePrivilege	3036	wmic.exe
Token: 33	3036	wmic.exe
Token: 34	3036	wmic.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1980 wrote to memory of 2516	1980	CrypticBootstrapper.exe	30
PID 1980 wrote to memory of 2516	1980	CrypticBootstrapper.exe	30
PID 1980 wrote to memory of 2516	1980	CrypticBootstrapper.exe	30
PID 1980 wrote to memory of 1908	1980	CrypticBootstrapper.exe	33
PID 1980 wrote to memory of 1908	1980	CrypticBootstrapper.exe	33
PID 1980 wrote to memory of 1908	1980	CrypticBootstrapper.exe	33
PID 1980 wrote to memory of 2880	1980	CrypticBootstrapper.exe	35
PID 1980 wrote to memory of 2880	1980	CrypticBootstrapper.exe	35
PID 1980 wrote to memory of 2880	1980	CrypticBootstrapper.exe	35
PID 1980 wrote to memory of 2824	1980	CrypticBootstrapper.exe	37
PID 1980 wrote to memory of 2824	1980	CrypticBootstrapper.exe	37
PID 1980 wrote to memory of 2824	1980	CrypticBootstrapper.exe	37
PID 1980 wrote to memory of 572	1980	CrypticBootstrapper.exe	39
PID 1980 wrote to memory of 572	1980	CrypticBootstrapper.exe	39
PID 1980 wrote to memory of 572	1980	CrypticBootstrapper.exe	39
PID 1980 wrote to memory of 3036	1980	CrypticBootstrapper.exe	41
PID 1980 wrote to memory of 3036	1980	CrypticBootstrapper.exe	41
PID 1980 wrote to memory of 3036	1980	CrypticBootstrapper.exe	41
PID 1980 wrote to memory of 2192	1980	CrypticBootstrapper.exe	43
PID 1980 wrote to memory of 2192	1980	CrypticBootstrapper.exe	43
PID 1980 wrote to memory of 2192	1980	CrypticBootstrapper.exe	43
PID 1980 wrote to memory of 2932	1980	CrypticBootstrapper.exe	45
PID 1980 wrote to memory of 2932	1980	CrypticBootstrapper.exe	45
PID 1980 wrote to memory of 2932	1980	CrypticBootstrapper.exe	45
PID 1980 wrote to memory of 2804	1980	CrypticBootstrapper.exe	47
PID 1980 wrote to memory of 2804	1980	CrypticBootstrapper.exe	47
PID 1980 wrote to memory of 2804	1980	CrypticBootstrapper.exe	47
PID 1980 wrote to memory of 2104	1980	CrypticBootstrapper.exe	49
PID 1980 wrote to memory of 2104	1980	CrypticBootstrapper.exe	49
PID 1980 wrote to memory of 2104	1980	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:1980
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2516
- 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:1908
- 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:2880
- 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:2824
- 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:572
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3036
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:2192
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:2932
- 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:2804
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:2104

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
f9ee66662411741bd6baaa2a8c447410

SHA1
c8dbcad9dad3d887c9268ef4360521f7c1422587

SHA256
47186cac0fdb5ddc20479410bedcf5012255e1d531e341861e0c8694c0cee19b

SHA512
2979ae5175c84456dd978da0abf69bb10302f8748f9c754806e402562d8676257d41ad2ed3a8bc19eaf1e438fc77e2cf6f503ec15635d4c019e50ed68b2a3bd0

Download Submit
memory/1908-7-0x000000001B700000-0x000000001B9E2000-memory.dmp

Filesize
2.9MB

Download
memory/1908-8-0x0000000001F00000-0x0000000001F08000-memory.dmp

Filesize
32KB

Download
memory/1980-0-0x000007FEF5C83000-0x000007FEF5C84000-memory.dmp

Filesize
4KB

Download
memory/1980-1-0x0000000000A80000-0x0000000000AC0000-memory.dmp

Filesize
256KB

Download
memory/1980-2-0x000007FEF5C80000-0x000007FEF666C000-memory.dmp

Filesize
9.9MB

Download
memory/1980-40-0x000007FEF5C83000-0x000007FEF5C84000-memory.dmp

Filesize
4KB

Download
memory/1980-52-0x000007FEF5C80000-0x000007FEF666C000-memory.dmp

Filesize
9.9MB

Download
memory/2804-47-0x0000000002400000-0x0000000002408000-memory.dmp

Filesize
32KB

Download
memory/2880-14-0x000000001B770000-0x000000001BA52000-memory.dmp

Filesize
2.9MB

Download
memory/2880-15-0x0000000001EF0000-0x0000000001EF8000-memory.dmp

Filesize
32KB

Download