umbral | c2ca7672dcc37f2d7d1d0a9ebbdd714b54558b3159033a60314599060b69b23e

Analysis

max time kernel
9s
max time network
7s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
02/02/2025, 20:45

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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/2248-1-0x000001E8C4ED0000-0x000001E8C4F10000-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
3856	powershell.exe
2464	powershell.exe
3516	powershell.exe
3616	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
4	discord.com
6	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
1	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
3436	cmd.exe
792	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2136	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
792	PING.EXE

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
2248	CrypticBootstrapper.exe
3856	powershell.exe
3856	powershell.exe
2464	powershell.exe
2464	powershell.exe
3516	powershell.exe
3516	powershell.exe
2160	powershell.exe
2160	powershell.exe
3616	powershell.exe
3616	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2248	CrypticBootstrapper.exe
Token: SeIncreaseQuotaPrivilege	3636	wmic.exe
Token: SeSecurityPrivilege	3636	wmic.exe
Token: SeTakeOwnershipPrivilege	3636	wmic.exe
Token: SeLoadDriverPrivilege	3636	wmic.exe
Token: SeSystemProfilePrivilege	3636	wmic.exe
Token: SeSystemtimePrivilege	3636	wmic.exe
Token: SeProfSingleProcessPrivilege	3636	wmic.exe
Token: SeIncBasePriorityPrivilege	3636	wmic.exe
Token: SeCreatePagefilePrivilege	3636	wmic.exe
Token: SeBackupPrivilege	3636	wmic.exe
Token: SeRestorePrivilege	3636	wmic.exe
Token: SeShutdownPrivilege	3636	wmic.exe
Token: SeDebugPrivilege	3636	wmic.exe
Token: SeSystemEnvironmentPrivilege	3636	wmic.exe
Token: SeRemoteShutdownPrivilege	3636	wmic.exe
Token: SeUndockPrivilege	3636	wmic.exe
Token: SeManageVolumePrivilege	3636	wmic.exe
Token: 33	3636	wmic.exe
Token: 34	3636	wmic.exe
Token: 35	3636	wmic.exe
Token: 36	3636	wmic.exe
Token: SeIncreaseQuotaPrivilege	3636	wmic.exe
Token: SeSecurityPrivilege	3636	wmic.exe
Token: SeTakeOwnershipPrivilege	3636	wmic.exe
Token: SeLoadDriverPrivilege	3636	wmic.exe
Token: SeSystemProfilePrivilege	3636	wmic.exe
Token: SeSystemtimePrivilege	3636	wmic.exe
Token: SeProfSingleProcessPrivilege	3636	wmic.exe
Token: SeIncBasePriorityPrivilege	3636	wmic.exe
Token: SeCreatePagefilePrivilege	3636	wmic.exe
Token: SeBackupPrivilege	3636	wmic.exe
Token: SeRestorePrivilege	3636	wmic.exe
Token: SeShutdownPrivilege	3636	wmic.exe
Token: SeDebugPrivilege	3636	wmic.exe
Token: SeSystemEnvironmentPrivilege	3636	wmic.exe
Token: SeRemoteShutdownPrivilege	3636	wmic.exe
Token: SeUndockPrivilege	3636	wmic.exe
Token: SeManageVolumePrivilege	3636	wmic.exe
Token: 33	3636	wmic.exe
Token: 34	3636	wmic.exe
Token: 35	3636	wmic.exe
Token: 36	3636	wmic.exe
Token: SeDebugPrivilege	3856	powershell.exe
Token: SeDebugPrivilege	2464	powershell.exe
Token: SeDebugPrivilege	3516	powershell.exe
Token: SeDebugPrivilege	2160	powershell.exe
Token: SeIncreaseQuotaPrivilege	4668	wmic.exe
Token: SeSecurityPrivilege	4668	wmic.exe
Token: SeTakeOwnershipPrivilege	4668	wmic.exe
Token: SeLoadDriverPrivilege	4668	wmic.exe
Token: SeSystemProfilePrivilege	4668	wmic.exe
Token: SeSystemtimePrivilege	4668	wmic.exe
Token: SeProfSingleProcessPrivilege	4668	wmic.exe
Token: SeIncBasePriorityPrivilege	4668	wmic.exe
Token: SeCreatePagefilePrivilege	4668	wmic.exe
Token: SeBackupPrivilege	4668	wmic.exe
Token: SeRestorePrivilege	4668	wmic.exe
Token: SeShutdownPrivilege	4668	wmic.exe
Token: SeDebugPrivilege	4668	wmic.exe
Token: SeSystemEnvironmentPrivilege	4668	wmic.exe
Token: SeRemoteShutdownPrivilege	4668	wmic.exe
Token: SeUndockPrivilege	4668	wmic.exe
Token: SeManageVolumePrivilege	4668	wmic.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 2248 wrote to memory of 3636	2248	CrypticBootstrapper.exe	77
PID 2248 wrote to memory of 3636	2248	CrypticBootstrapper.exe	77
PID 2248 wrote to memory of 2848	2248	CrypticBootstrapper.exe	80
PID 2248 wrote to memory of 2848	2248	CrypticBootstrapper.exe	80
PID 2248 wrote to memory of 3856	2248	CrypticBootstrapper.exe	82
PID 2248 wrote to memory of 3856	2248	CrypticBootstrapper.exe	82
PID 2248 wrote to memory of 2464	2248	CrypticBootstrapper.exe	84
PID 2248 wrote to memory of 2464	2248	CrypticBootstrapper.exe	84
PID 2248 wrote to memory of 3516	2248	CrypticBootstrapper.exe	86
PID 2248 wrote to memory of 3516	2248	CrypticBootstrapper.exe	86
PID 2248 wrote to memory of 2160	2248	CrypticBootstrapper.exe	88
PID 2248 wrote to memory of 2160	2248	CrypticBootstrapper.exe	88
PID 2248 wrote to memory of 4668	2248	CrypticBootstrapper.exe	90
PID 2248 wrote to memory of 4668	2248	CrypticBootstrapper.exe	90
PID 2248 wrote to memory of 720	2248	CrypticBootstrapper.exe	92
PID 2248 wrote to memory of 720	2248	CrypticBootstrapper.exe	92
PID 2248 wrote to memory of 3828	2248	CrypticBootstrapper.exe	94
PID 2248 wrote to memory of 3828	2248	CrypticBootstrapper.exe	94
PID 2248 wrote to memory of 3616	2248	CrypticBootstrapper.exe	96
PID 2248 wrote to memory of 3616	2248	CrypticBootstrapper.exe	96
PID 2248 wrote to memory of 2136	2248	CrypticBootstrapper.exe	98
PID 2248 wrote to memory of 2136	2248	CrypticBootstrapper.exe	98
PID 2248 wrote to memory of 3436	2248	CrypticBootstrapper.exe	100
PID 2248 wrote to memory of 3436	2248	CrypticBootstrapper.exe	100
PID 3436 wrote to memory of 792	3436	cmd.exe	102
PID 3436 wrote to memory of 792	3436	cmd.exe	102

Views/modifies file attributes 1 TTPs 1 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
2848	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:2248
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3636
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\CrypticBootstrapper.exe"
  2⤵
  - Views/modifies file attributes
  PID:2848
- 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:3856
- 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:2464
- 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:3516
- 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:2160
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4668
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:720
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:3828
- 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:3616
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:2136
- 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:3436
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:792

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
627073ee3ca9676911bee35548eff2b8

SHA1
4c4b68c65e2cab9864b51167d710aa29ebdcff2e

SHA256
85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

SHA512
3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

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

Filesize
944B

MD5
7d760ca2472bcb9fe9310090d91318ce

SHA1
cb316b8560b38ea16a17626e685d5a501cd31c4a

SHA256
5c362b53c4a4578d8b57c51e1eac15f7f3b2447e43e0dad5102ecd003d5b41d4

SHA512
141e8661d7348ebbc1f74f828df956a0c6e4cdb70f3b9d52623c9a30993bfd91da9ed7d8d284b84f173d3e6f47c876fb4a8295110895f44d97fd6cc4c5659c35

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

Filesize
948B

MD5
fa21dd50b4e64421076f843031c8ccf7

SHA1
2c56e94f130c0d8d77116e939ffee4e37cf982bd

SHA256
e4f21aca1e12aafa8de7af24b79a75526e902c7d4b3fea5bdb6e723976997be3

SHA512
b8de2bfeb7af06c587dd1f424d410cf83471f31a55a3ea4c4481ce07ffd9bf66ddc1f7775ecd6ac65ac33baaec90ba5a208a9aefc84f31125a50dfb919982687

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
b95bea0e645f6de57d24b86919c5043d

SHA1
a618ae57d56da493177bfd7510e1507dce6382a7

SHA256
4d63dbe6465121136a77767bde1ddf6eeff1ce7c792272b9e6dd1732e6a49b1e

SHA512
73b28e62b6ff9eb38f495b3bb1a64812d0800a949b88b32516e3386e70a8ad4127245aa0bf07345950b3b357fc7e54a563ab5f9543e49245b0ec81656f60f0fc

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_mx11ikq0.sko.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2248-68-0x000001E8DF630000-0x000001E8DF63A000-memory.dmp

Filesize
40KB

Download
memory/2248-33-0x000001E8DF640000-0x000001E8DF65E000-memory.dmp

Filesize
120KB

Download
memory/2248-88-0x00007FFC2A030000-0x00007FFC2AAF2000-memory.dmp

Filesize
10.8MB

Download
memory/2248-69-0x000001E8DF680000-0x000001E8DF692000-memory.dmp

Filesize
72KB

Download
memory/2248-2-0x00007FFC2A030000-0x00007FFC2AAF2000-memory.dmp

Filesize
10.8MB

Download
memory/2248-31-0x000001E8DF6A0000-0x000001E8DF716000-memory.dmp

Filesize
472KB

Download
memory/2248-32-0x000001E8DF720000-0x000001E8DF770000-memory.dmp

Filesize
320KB

Download
memory/2248-0-0x00007FFC2A033000-0x00007FFC2A035000-memory.dmp

Filesize
8KB

Download
memory/2248-1-0x000001E8C4ED0000-0x000001E8C4F10000-memory.dmp

Filesize
256KB

Download
memory/3856-14-0x00007FFC2A030000-0x00007FFC2AAF2000-memory.dmp

Filesize
10.8MB

Download
memory/3856-5-0x00007FFC2A030000-0x00007FFC2AAF2000-memory.dmp

Filesize
10.8MB

Download
memory/3856-3-0x00007FFC2A030000-0x00007FFC2AAF2000-memory.dmp

Filesize
10.8MB

Download
memory/3856-4-0x000001FFD8C50000-0x000001FFD8C72000-memory.dmp

Filesize
136KB

Download
memory/3856-17-0x00007FFC2A030000-0x00007FFC2AAF2000-memory.dmp

Filesize
10.8MB

Download