umbral | c2ca7672dcc37f2d7d1d0a9ebbdd714b54558b3159033a60314599060b69b23e

Analysis

max time kernel
122s
max time network
122s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-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
behavioral1/memory/2452-1-0x0000000001140000-0x0000000001180000-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
2832	powershell.exe
2820	powershell.exe
2588	powershell.exe
1716	powershell.exe

Drops file in Drivers directory 1 IoCs

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

Deletes itself 1 IoCs

pid	Process
2392	cmd.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

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
2392	cmd.exe
2888	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2760	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2888	PING.EXE

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2452	CrypticBootstrapper.exe
2832	powershell.exe
2820	powershell.exe
2588	powershell.exe
2296	powershell.exe
1716	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2452	CrypticBootstrapper.exe
Token: SeIncreaseQuotaPrivilege	3056	wmic.exe
Token: SeSecurityPrivilege	3056	wmic.exe
Token: SeTakeOwnershipPrivilege	3056	wmic.exe
Token: SeLoadDriverPrivilege	3056	wmic.exe
Token: SeSystemProfilePrivilege	3056	wmic.exe
Token: SeSystemtimePrivilege	3056	wmic.exe
Token: SeProfSingleProcessPrivilege	3056	wmic.exe
Token: SeIncBasePriorityPrivilege	3056	wmic.exe
Token: SeCreatePagefilePrivilege	3056	wmic.exe
Token: SeBackupPrivilege	3056	wmic.exe
Token: SeRestorePrivilege	3056	wmic.exe
Token: SeShutdownPrivilege	3056	wmic.exe
Token: SeDebugPrivilege	3056	wmic.exe
Token: SeSystemEnvironmentPrivilege	3056	wmic.exe
Token: SeRemoteShutdownPrivilege	3056	wmic.exe
Token: SeUndockPrivilege	3056	wmic.exe
Token: SeManageVolumePrivilege	3056	wmic.exe
Token: 33	3056	wmic.exe
Token: 34	3056	wmic.exe
Token: 35	3056	wmic.exe
Token: SeIncreaseQuotaPrivilege	3056	wmic.exe
Token: SeSecurityPrivilege	3056	wmic.exe
Token: SeTakeOwnershipPrivilege	3056	wmic.exe
Token: SeLoadDriverPrivilege	3056	wmic.exe
Token: SeSystemProfilePrivilege	3056	wmic.exe
Token: SeSystemtimePrivilege	3056	wmic.exe
Token: SeProfSingleProcessPrivilege	3056	wmic.exe
Token: SeIncBasePriorityPrivilege	3056	wmic.exe
Token: SeCreatePagefilePrivilege	3056	wmic.exe
Token: SeBackupPrivilege	3056	wmic.exe
Token: SeRestorePrivilege	3056	wmic.exe
Token: SeShutdownPrivilege	3056	wmic.exe
Token: SeDebugPrivilege	3056	wmic.exe
Token: SeSystemEnvironmentPrivilege	3056	wmic.exe
Token: SeRemoteShutdownPrivilege	3056	wmic.exe
Token: SeUndockPrivilege	3056	wmic.exe
Token: SeManageVolumePrivilege	3056	wmic.exe
Token: 33	3056	wmic.exe
Token: 34	3056	wmic.exe
Token: 35	3056	wmic.exe
Token: SeDebugPrivilege	2832	powershell.exe
Token: SeDebugPrivilege	2820	powershell.exe
Token: SeDebugPrivilege	2588	powershell.exe
Token: SeDebugPrivilege	2296	powershell.exe
Token: SeIncreaseQuotaPrivilege	2364	wmic.exe
Token: SeSecurityPrivilege	2364	wmic.exe
Token: SeTakeOwnershipPrivilege	2364	wmic.exe
Token: SeLoadDriverPrivilege	2364	wmic.exe
Token: SeSystemProfilePrivilege	2364	wmic.exe
Token: SeSystemtimePrivilege	2364	wmic.exe
Token: SeProfSingleProcessPrivilege	2364	wmic.exe
Token: SeIncBasePriorityPrivilege	2364	wmic.exe
Token: SeCreatePagefilePrivilege	2364	wmic.exe
Token: SeBackupPrivilege	2364	wmic.exe
Token: SeRestorePrivilege	2364	wmic.exe
Token: SeShutdownPrivilege	2364	wmic.exe
Token: SeDebugPrivilege	2364	wmic.exe
Token: SeSystemEnvironmentPrivilege	2364	wmic.exe
Token: SeRemoteShutdownPrivilege	2364	wmic.exe
Token: SeUndockPrivilege	2364	wmic.exe
Token: SeManageVolumePrivilege	2364	wmic.exe
Token: 33	2364	wmic.exe
Token: 34	2364	wmic.exe

Suspicious use of WriteProcessMemory 39 IoCs

description	pid	Process	procid_target
PID 2452 wrote to memory of 3056	2452	CrypticBootstrapper.exe	31
PID 2452 wrote to memory of 3056	2452	CrypticBootstrapper.exe	31
PID 2452 wrote to memory of 3056	2452	CrypticBootstrapper.exe	31
PID 2452 wrote to memory of 2804	2452	CrypticBootstrapper.exe	34
PID 2452 wrote to memory of 2804	2452	CrypticBootstrapper.exe	34
PID 2452 wrote to memory of 2804	2452	CrypticBootstrapper.exe	34
PID 2452 wrote to memory of 2832	2452	CrypticBootstrapper.exe	36
PID 2452 wrote to memory of 2832	2452	CrypticBootstrapper.exe	36
PID 2452 wrote to memory of 2832	2452	CrypticBootstrapper.exe	36
PID 2452 wrote to memory of 2820	2452	CrypticBootstrapper.exe	38
PID 2452 wrote to memory of 2820	2452	CrypticBootstrapper.exe	38
PID 2452 wrote to memory of 2820	2452	CrypticBootstrapper.exe	38
PID 2452 wrote to memory of 2588	2452	CrypticBootstrapper.exe	40
PID 2452 wrote to memory of 2588	2452	CrypticBootstrapper.exe	40
PID 2452 wrote to memory of 2588	2452	CrypticBootstrapper.exe	40
PID 2452 wrote to memory of 2296	2452	CrypticBootstrapper.exe	42
PID 2452 wrote to memory of 2296	2452	CrypticBootstrapper.exe	42
PID 2452 wrote to memory of 2296	2452	CrypticBootstrapper.exe	42
PID 2452 wrote to memory of 2364	2452	CrypticBootstrapper.exe	44
PID 2452 wrote to memory of 2364	2452	CrypticBootstrapper.exe	44
PID 2452 wrote to memory of 2364	2452	CrypticBootstrapper.exe	44
PID 2452 wrote to memory of 2520	2452	CrypticBootstrapper.exe	46
PID 2452 wrote to memory of 2520	2452	CrypticBootstrapper.exe	46
PID 2452 wrote to memory of 2520	2452	CrypticBootstrapper.exe	46
PID 2452 wrote to memory of 1696	2452	CrypticBootstrapper.exe	48
PID 2452 wrote to memory of 1696	2452	CrypticBootstrapper.exe	48
PID 2452 wrote to memory of 1696	2452	CrypticBootstrapper.exe	48
PID 2452 wrote to memory of 1716	2452	CrypticBootstrapper.exe	50
PID 2452 wrote to memory of 1716	2452	CrypticBootstrapper.exe	50
PID 2452 wrote to memory of 1716	2452	CrypticBootstrapper.exe	50
PID 2452 wrote to memory of 2760	2452	CrypticBootstrapper.exe	52
PID 2452 wrote to memory of 2760	2452	CrypticBootstrapper.exe	52
PID 2452 wrote to memory of 2760	2452	CrypticBootstrapper.exe	52
PID 2452 wrote to memory of 2392	2452	CrypticBootstrapper.exe	54
PID 2452 wrote to memory of 2392	2452	CrypticBootstrapper.exe	54
PID 2452 wrote to memory of 2392	2452	CrypticBootstrapper.exe	54
PID 2392 wrote to memory of 2888	2392	cmd.exe	56
PID 2392 wrote to memory of 2888	2392	cmd.exe	56
PID 2392 wrote to memory of 2888	2392	cmd.exe	56

Views/modifies file attributes 1 TTPs 1 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
2804	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:2452
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3056
- C:\Windows\system32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\CrypticBootstrapper.exe"
  2⤵
  - Views/modifies file attributes
  PID:2804
- 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:2832
- 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:2820
- 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:2588
- 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:2296
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2364
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:2520
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1696
- 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:1716
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:2760
- C:\Windows\system32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\CrypticBootstrapper.exe" && pause
  2⤵
  - Deletes itself
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:2392
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:2888

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\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
3de458e1b9fe641ebcc18d0fccfef9d6

SHA1
3f9f5ea29caf3179465a0275420125400585dbad

SHA256
43c5c03df5625218ea8f226e162779876ed8c8f657e5e879bc1452f2bd805a73

SHA512
994c47bd3aa67080faf0b32ccdbe720e56853d27cfb0e67aa02452d6ef5ca0cc2fae6f0e32e6e53f66708652fcd0d0cd4fbfdf84f8bdf8f4502afd4031103ae4

Download Submit
memory/1716-42-0x0000000002080000-0x0000000002088000-memory.dmp

Filesize
32KB

Download
memory/2452-0-0x000007FEF5733000-0x000007FEF5734000-memory.dmp

Filesize
4KB

Download
memory/2452-1-0x0000000001140000-0x0000000001180000-memory.dmp

Filesize
256KB

Download
memory/2452-2-0x000007FEF5730000-0x000007FEF611C000-memory.dmp

Filesize
9.9MB

Download
memory/2452-46-0x000007FEF5730000-0x000007FEF611C000-memory.dmp

Filesize
9.9MB

Download
memory/2820-14-0x000000001B530000-0x000000001B812000-memory.dmp

Filesize
2.9MB

Download
memory/2820-15-0x0000000002870000-0x0000000002878000-memory.dmp

Filesize
32KB

Download
memory/2832-7-0x000000001B630000-0x000000001B912000-memory.dmp

Filesize
2.9MB

Download
memory/2832-8-0x0000000002040000-0x0000000002048000-memory.dmp

Filesize
32KB

Download