umbral | c2ca7672dcc37f2d7d1d0a9ebbdd714b54558b3159033a60314599060b69b23e

Analysis

max time kernel
93s
max time network
115s
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 20:08

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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/628-1-0x000001C55B7C0000-0x000001C55B800000-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
2340	powershell.exe
320	powershell.exe
4888	powershell.exe
4292	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
25	discord.com
26	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
3	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
1052	cmd.exe
4672	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2796	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4672	PING.EXE

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
628	CrypticBootstrapper.exe
2340	powershell.exe
2340	powershell.exe
320	powershell.exe
320	powershell.exe
4888	powershell.exe
4888	powershell.exe
1892	powershell.exe
1892	powershell.exe
4292	powershell.exe
4292	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	628	CrypticBootstrapper.exe
Token: SeIncreaseQuotaPrivilege	4204	wmic.exe
Token: SeSecurityPrivilege	4204	wmic.exe
Token: SeTakeOwnershipPrivilege	4204	wmic.exe
Token: SeLoadDriverPrivilege	4204	wmic.exe
Token: SeSystemProfilePrivilege	4204	wmic.exe
Token: SeSystemtimePrivilege	4204	wmic.exe
Token: SeProfSingleProcessPrivilege	4204	wmic.exe
Token: SeIncBasePriorityPrivilege	4204	wmic.exe
Token: SeCreatePagefilePrivilege	4204	wmic.exe
Token: SeBackupPrivilege	4204	wmic.exe
Token: SeRestorePrivilege	4204	wmic.exe
Token: SeShutdownPrivilege	4204	wmic.exe
Token: SeDebugPrivilege	4204	wmic.exe
Token: SeSystemEnvironmentPrivilege	4204	wmic.exe
Token: SeRemoteShutdownPrivilege	4204	wmic.exe
Token: SeUndockPrivilege	4204	wmic.exe
Token: SeManageVolumePrivilege	4204	wmic.exe
Token: 33	4204	wmic.exe
Token: 34	4204	wmic.exe
Token: 35	4204	wmic.exe
Token: 36	4204	wmic.exe
Token: SeIncreaseQuotaPrivilege	4204	wmic.exe
Token: SeSecurityPrivilege	4204	wmic.exe
Token: SeTakeOwnershipPrivilege	4204	wmic.exe
Token: SeLoadDriverPrivilege	4204	wmic.exe
Token: SeSystemProfilePrivilege	4204	wmic.exe
Token: SeSystemtimePrivilege	4204	wmic.exe
Token: SeProfSingleProcessPrivilege	4204	wmic.exe
Token: SeIncBasePriorityPrivilege	4204	wmic.exe
Token: SeCreatePagefilePrivilege	4204	wmic.exe
Token: SeBackupPrivilege	4204	wmic.exe
Token: SeRestorePrivilege	4204	wmic.exe
Token: SeShutdownPrivilege	4204	wmic.exe
Token: SeDebugPrivilege	4204	wmic.exe
Token: SeSystemEnvironmentPrivilege	4204	wmic.exe
Token: SeRemoteShutdownPrivilege	4204	wmic.exe
Token: SeUndockPrivilege	4204	wmic.exe
Token: SeManageVolumePrivilege	4204	wmic.exe
Token: 33	4204	wmic.exe
Token: 34	4204	wmic.exe
Token: 35	4204	wmic.exe
Token: 36	4204	wmic.exe
Token: SeDebugPrivilege	2340	powershell.exe
Token: SeDebugPrivilege	320	powershell.exe
Token: SeDebugPrivilege	4888	powershell.exe
Token: SeDebugPrivilege	1892	powershell.exe
Token: SeIncreaseQuotaPrivilege	4676	wmic.exe
Token: SeSecurityPrivilege	4676	wmic.exe
Token: SeTakeOwnershipPrivilege	4676	wmic.exe
Token: SeLoadDriverPrivilege	4676	wmic.exe
Token: SeSystemProfilePrivilege	4676	wmic.exe
Token: SeSystemtimePrivilege	4676	wmic.exe
Token: SeProfSingleProcessPrivilege	4676	wmic.exe
Token: SeIncBasePriorityPrivilege	4676	wmic.exe
Token: SeCreatePagefilePrivilege	4676	wmic.exe
Token: SeBackupPrivilege	4676	wmic.exe
Token: SeRestorePrivilege	4676	wmic.exe
Token: SeShutdownPrivilege	4676	wmic.exe
Token: SeDebugPrivilege	4676	wmic.exe
Token: SeSystemEnvironmentPrivilege	4676	wmic.exe
Token: SeRemoteShutdownPrivilege	4676	wmic.exe
Token: SeUndockPrivilege	4676	wmic.exe
Token: SeManageVolumePrivilege	4676	wmic.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 628 wrote to memory of 4204	628	CrypticBootstrapper.exe	84
PID 628 wrote to memory of 4204	628	CrypticBootstrapper.exe	84
PID 628 wrote to memory of 3260	628	CrypticBootstrapper.exe	90
PID 628 wrote to memory of 3260	628	CrypticBootstrapper.exe	90
PID 628 wrote to memory of 2340	628	CrypticBootstrapper.exe	92
PID 628 wrote to memory of 2340	628	CrypticBootstrapper.exe	92
PID 628 wrote to memory of 320	628	CrypticBootstrapper.exe	94
PID 628 wrote to memory of 320	628	CrypticBootstrapper.exe	94
PID 628 wrote to memory of 4888	628	CrypticBootstrapper.exe	96
PID 628 wrote to memory of 4888	628	CrypticBootstrapper.exe	96
PID 628 wrote to memory of 1892	628	CrypticBootstrapper.exe	98
PID 628 wrote to memory of 1892	628	CrypticBootstrapper.exe	98
PID 628 wrote to memory of 4676	628	CrypticBootstrapper.exe	100
PID 628 wrote to memory of 4676	628	CrypticBootstrapper.exe	100
PID 628 wrote to memory of 3448	628	CrypticBootstrapper.exe	102
PID 628 wrote to memory of 3448	628	CrypticBootstrapper.exe	102
PID 628 wrote to memory of 4944	628	CrypticBootstrapper.exe	104
PID 628 wrote to memory of 4944	628	CrypticBootstrapper.exe	104
PID 628 wrote to memory of 4292	628	CrypticBootstrapper.exe	106
PID 628 wrote to memory of 4292	628	CrypticBootstrapper.exe	106
PID 628 wrote to memory of 2796	628	CrypticBootstrapper.exe	108
PID 628 wrote to memory of 2796	628	CrypticBootstrapper.exe	108
PID 628 wrote to memory of 1052	628	CrypticBootstrapper.exe	110
PID 628 wrote to memory of 1052	628	CrypticBootstrapper.exe	110
PID 1052 wrote to memory of 4672	1052	cmd.exe	112
PID 1052 wrote to memory of 4672	1052	cmd.exe	112

Views/modifies file attributes 1 TTPs 1 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
3260	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:628
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4204
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\CrypticBootstrapper.exe"
  2⤵
  - Views/modifies file attributes
  PID:3260
- 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:2340
- 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:320
- 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:4888
- 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:1892
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4676
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:3448
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:4944
- 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:4292
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:2796
- 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:1052
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:4672

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
c9b6705519e1eef08f86c4ba5f4286f3

SHA1
6c6b179e452ecee2673a1d4fe128f1c06f70577f

SHA256
0f9cad44a79126871580e19b01dc3f880c5173b1faaf8b9018d5d1f829714705

SHA512
6d8f85a7a8b0b124530f36a157cd0441b5c1eacdc35e274af9fbf0569d03d1d5e468651a5b2425f0215c282ecfa7b1ffeaeeaf18612822f00bd14306d30640c7

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

Filesize
1KB

MD5
276798eeb29a49dc6e199768bc9c2e71

SHA1
5fdc8ccb897ac2df7476fbb07517aca5b7a6205b

SHA256
cd0a1056e8f1b6cb5cb328532239d802f4e2aa8f8fcdc0fcb487684bd68e0dcc

SHA512
0d34fce64bbefc57d64fa6e03ca886952263d5f24df9c1c4cce6a1e8f5a47a9a21e9820f8d38caa7f7b43a52336ce00b738ea18419aaa7c788b72e04ce19e4f2

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

Filesize
1KB

MD5
ec1ba4a995d866b282087b26a0539bbc

SHA1
c4aeae2bc3fa9a898680648b20102f01e8a811cf

SHA256
469da678c3c0364b1b511962cffd44cbfc10aab5c1c528c0c09fd952f08d8a2c

SHA512
07bf757ec9d0d368d3ef1bfc2b562895e2708757f8fefa04fa50beaa6fb38af1018ea0cfccf5666c5c8baa4c894deead9652c53e0608aa6a83ef5b396dba43e9

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_v5nsaw1n.cuc.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/628-71-0x000001C575D70000-0x000001C575D7A000-memory.dmp

Filesize
40KB

Download
memory/628-35-0x000001C575DA0000-0x000001C575DBE000-memory.dmp

Filesize
120KB

Download
memory/628-90-0x00007FFBD6370000-0x00007FFBD6E31000-memory.dmp

Filesize
10.8MB

Download
memory/628-72-0x000001C575F20000-0x000001C575F32000-memory.dmp

Filesize
72KB

Download
memory/628-2-0x00007FFBD6370000-0x00007FFBD6E31000-memory.dmp

Filesize
10.8MB

Download
memory/628-33-0x000001C575F50000-0x000001C575FC6000-memory.dmp

Filesize
472KB

Download
memory/628-34-0x000001C575ED0000-0x000001C575F20000-memory.dmp

Filesize
320KB

Download
memory/628-0-0x00007FFBD6373000-0x00007FFBD6375000-memory.dmp

Filesize
8KB

Download
memory/628-1-0x000001C55B7C0000-0x000001C55B800000-memory.dmp

Filesize
256KB

Download
memory/2340-15-0x00007FFBD6370000-0x00007FFBD6E31000-memory.dmp

Filesize
10.8MB

Download
memory/2340-4-0x00007FFBD6370000-0x00007FFBD6E31000-memory.dmp

Filesize
10.8MB

Download
memory/2340-3-0x00007FFBD6370000-0x00007FFBD6E31000-memory.dmp

Filesize
10.8MB

Download
memory/2340-14-0x000001D9FA000000-0x000001D9FA022000-memory.dmp

Filesize
136KB

Download
memory/2340-18-0x00007FFBD6370000-0x00007FFBD6E31000-memory.dmp

Filesize
10.8MB

Download