umbral | 4cc1f9f24687b31979df108d1cb40b332b2b867aa004314b3844fc9388051d10

Analysis

max time kernel
80s
max time network
129s
platform
windows10-2004_x64
resource
win10v2004-20250207-en
resource tags

arch:x64arch:x86image:win10v2004-20250207-enlocale:en-usos:windows10-2004-x64system
submitted
07-02-2025 18:39

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

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

1KB
MD5

4c86e93d580bdd34d6a789b0f46afab7
SHA1

d6598b1ea15eefba1316a52a8ba721c77152f20c
SHA256

cd531534cc3454ff81864230d94c8aa26952be3fe6e34dab128c23f71c3e5d56
SHA512

fdfba0de21c8e65b59ebe2e0b96c97adb02da9766b8a30fb9bb1ce1a5ee46335e03f7b4c13a590351670638042b5a8d5065fe9c21fe2ce3108a39d53432d353a

Score

10^/10

umbral discovery execution stealer

Malware Config

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral6/files/0x000d000000023cd2-23.dat	family_umbral
behavioral6/memory/224-31-0x00000202A6730000-0x00000202A6770000-memory.dmp	family_umbral

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral
Umbral family
umbral

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1639772215-809007892-4072230623-1000\Control Panel\International\Geo\Nation	cmd.exe

Executes dropped EXE 2 IoCs

pid	Process
224	Umbral.exe
1448	KRX Client.exe

Unexpected DNS network traffic destination 20 IoCs

Network traffic to other servers than the configured DNS servers was detected on the DNS port.

description	flow	ioc	pid	Process
Destination IP	10	192.227.173.56	224	Umbral.exe
Destination IP	15	41.204.224.38	1856	Process not Found
Destination IP	18	41.204.224.38	1856	Process not Found
Destination IP	20	41.204.224.38	1856	Process not Found
Destination IP	25	192.227.173.56	1856	Process not Found
Destination IP	27	192.227.173.56	1856	Process not Found
Destination IP	13	41.204.224.38	1856	Process not Found
Destination IP	14	192.227.173.56	1856	Process not Found
Destination IP	16	192.227.173.56	1856	Process not Found
Destination IP	22	192.227.173.56	1856	Process not Found
Destination IP	23	41.204.224.38	1856	Process not Found
Destination IP	11	192.227.173.56	1856	Process not Found
Destination IP	17	41.204.224.38	1856	Process not Found
Destination IP	19	192.227.173.56	1856	Process not Found
Destination IP	21	41.204.224.38	1856	Process not Found
Destination IP	29	192.227.173.56	224	Umbral.exe
Destination IP	12	41.204.224.38	224	Umbral.exe
Destination IP	24	192.227.173.56	1856	Process not Found
Destination IP	26	41.204.224.38	1856	Process not Found
Destination IP	28	41.204.224.38	224	Umbral.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
3480	powershell.exe

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 2 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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MicrosoftEdgeUpdate.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
228	ipconfig.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1639772215-809007892-4072230623-1000_Classes\Local Settings	cmd.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3480	powershell.exe
3480	powershell.exe
1468	MicrosoftEdgeUpdate.exe
1468	MicrosoftEdgeUpdate.exe
1468	MicrosoftEdgeUpdate.exe
1468	MicrosoftEdgeUpdate.exe

Suspicious use of AdjustPrivilegeToken 45 IoCs

description	pid	Process
Token: SeDebugPrivilege	3480	powershell.exe
Token: SeIncreaseQuotaPrivilege	3480	powershell.exe
Token: SeSecurityPrivilege	3480	powershell.exe
Token: SeTakeOwnershipPrivilege	3480	powershell.exe
Token: SeLoadDriverPrivilege	3480	powershell.exe
Token: SeSystemProfilePrivilege	3480	powershell.exe
Token: SeSystemtimePrivilege	3480	powershell.exe
Token: SeProfSingleProcessPrivilege	3480	powershell.exe
Token: SeIncBasePriorityPrivilege	3480	powershell.exe
Token: SeCreatePagefilePrivilege	3480	powershell.exe
Token: SeBackupPrivilege	3480	powershell.exe
Token: SeRestorePrivilege	3480	powershell.exe
Token: SeShutdownPrivilege	3480	powershell.exe
Token: SeDebugPrivilege	3480	powershell.exe
Token: SeSystemEnvironmentPrivilege	3480	powershell.exe
Token: SeRemoteShutdownPrivilege	3480	powershell.exe
Token: SeUndockPrivilege	3480	powershell.exe
Token: SeManageVolumePrivilege	3480	powershell.exe
Token: 33	3480	powershell.exe
Token: 34	3480	powershell.exe
Token: 35	3480	powershell.exe
Token: 36	3480	powershell.exe
Token: SeIncreaseQuotaPrivilege	3480	powershell.exe
Token: SeSecurityPrivilege	3480	powershell.exe
Token: SeTakeOwnershipPrivilege	3480	powershell.exe
Token: SeLoadDriverPrivilege	3480	powershell.exe
Token: SeSystemProfilePrivilege	3480	powershell.exe
Token: SeSystemtimePrivilege	3480	powershell.exe
Token: SeProfSingleProcessPrivilege	3480	powershell.exe
Token: SeIncBasePriorityPrivilege	3480	powershell.exe
Token: SeCreatePagefilePrivilege	3480	powershell.exe
Token: SeBackupPrivilege	3480	powershell.exe
Token: SeRestorePrivilege	3480	powershell.exe
Token: SeShutdownPrivilege	3480	powershell.exe
Token: SeDebugPrivilege	3480	powershell.exe
Token: SeSystemEnvironmentPrivilege	3480	powershell.exe
Token: SeRemoteShutdownPrivilege	3480	powershell.exe
Token: SeUndockPrivilege	3480	powershell.exe
Token: SeManageVolumePrivilege	3480	powershell.exe
Token: 33	3480	powershell.exe
Token: 34	3480	powershell.exe
Token: 35	3480	powershell.exe
Token: 36	3480	powershell.exe
Token: SeDebugPrivilege	224	Umbral.exe
Token: SeDebugPrivilege	1468	MicrosoftEdgeUpdate.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4308 wrote to memory of 4932	4308	cmd.exe	82
PID 4308 wrote to memory of 4932	4308	cmd.exe	82
PID 4932 wrote to memory of 888	4932	cmd.exe	83
PID 4932 wrote to memory of 888	4932	cmd.exe	83
PID 4932 wrote to memory of 3480	4932	cmd.exe	84
PID 4932 wrote to memory of 3480	4932	cmd.exe	84
PID 4932 wrote to memory of 228	4932	cmd.exe	88
PID 4932 wrote to memory of 228	4932	cmd.exe	88
PID 4932 wrote to memory of 2260	4932	cmd.exe	89
PID 4932 wrote to memory of 2260	4932	cmd.exe	89
PID 4932 wrote to memory of 2260	4932	cmd.exe	89
PID 2260 wrote to memory of 224	2260	KRX Client.exe	90
PID 2260 wrote to memory of 224	2260	KRX Client.exe	90
PID 2260 wrote to memory of 1448	2260	KRX Client.exe	91
PID 2260 wrote to memory of 1448	2260	KRX Client.exe	91

C:\Windows\system32\cmd.exe
cmd /c "C:\Users\Admin\AppData\Local\Temp\krx\RUN THIS SCRIPT TO START KRX.bat.lnk"
1⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4308
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\krx\.RUN THIS SCRIPT TO START KRX.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4932
- - C:\Windows\system32\openfiles.exe
    openfiles
    3⤵
    PID:888
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell -ExecutionPolicy Bypass -NoProfile -File "C:\Users\Admin\AppData\Local\Temp\krx\.crack.ps1"
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3480
- - C:\Windows\system32\ipconfig.exe
    ipconfig /flushdns
    3⤵
    - Gathers network information
    PID:228
- - C:\Users\Admin\AppData\Local\Temp\krx\krx\KRX Client.exe
    "C:\Users\Admin\AppData\Local\Temp\krx\krx/KRX Client.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2260
  - - C:\Users\Admin\AppData\Local\Temp\Umbral.exe
      "C:\Users\Admin\AppData\Local\Temp\Umbral.exe"
      4⤵
      Executes dropped EXE
      Unexpected DNS network traffic destination
      Suspicious use of AdjustPrivilegeToken
      PID:224
  - - C:\Users\Admin\AppData\Local\Temp\KRX Client.exe
      "C:\Users\Admin\AppData\Local\Temp\KRX Client.exe"
      4⤵
      Executes dropped EXE
      PID:1448

C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
"C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ua /installsource scheduler
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1468

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

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

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\Local\Temp\__PSScriptPolicyTest_skylladp.x04.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/224-31-0x00000202A6730000-0x00000202A6770000-memory.dmp

Filesize
256KB

Download
memory/1448-41-0x0000000140000000-0x0000000142086000-memory.dmp

Filesize
32.5MB

Download
memory/3480-2-0x00007FF8A6323000-0x00007FF8A6325000-memory.dmp

Filesize
8KB

Download
memory/3480-3-0x000002483CE90000-0x000002483CEB2000-memory.dmp

Filesize
136KB

Download
memory/3480-13-0x00007FF8A6320000-0x00007FF8A6DE1000-memory.dmp

Filesize
10.8MB

Download
memory/3480-14-0x00007FF8A6320000-0x00007FF8A6DE1000-memory.dmp

Filesize
10.8MB

Download
memory/3480-16-0x000002483D370000-0x000002483D38A000-memory.dmp

Filesize
104KB

Download
memory/3480-15-0x0000024822900000-0x0000024822910000-memory.dmp

Filesize
64KB

Download
memory/3480-18-0x00007FF8A6320000-0x00007FF8A6DE1000-memory.dmp

Filesize
10.8MB

Download