umbral | 4cc1f9f24687b31979df108d1cb40b332b2b867aa004314b3844fc9388051d10

Analysis

max time kernel
132s
max time network
147s
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

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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 stealer

Malware Config

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral2/files/0x000d000000023d20-22.dat	family_umbral
behavioral2/memory/2472-30-0x00000232733D0000-0x0000023273410000-memory.dmp	family_umbral

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

Executes dropped EXE 2 IoCs

pid	Process
2472	Umbral.exe
4376	KRX Client.exe

Unexpected DNS network traffic destination 24 IoCs

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

description	flow	ioc	pid	Process
Destination IP	20	192.227.173.56	2008	Process not Found
Destination IP	23	41.204.224.38	2008	Process not Found
Destination IP	7	41.204.224.38	2472	Umbral.exe
Destination IP	11	192.227.173.56	2008	Process not Found
Destination IP	12	41.204.224.38	2008	Process not Found
Destination IP	14	192.227.173.56	2008	Process not Found
Destination IP	17	192.227.173.56	2008	Process not Found
Destination IP	5	192.227.173.56	2472	Umbral.exe
Destination IP	10	41.204.224.38	2008	Process not Found
Destination IP	15	41.204.224.38	2008	Process not Found
Destination IP	18	192.227.173.56	2008	Process not Found
Destination IP	19	41.204.224.38	2008	Process not Found
Destination IP	6	192.227.173.56	2008	Process not Found
Destination IP	8	41.204.224.38	2008	Process not Found
Destination IP	13	41.204.224.38	2008	Process not Found
Destination IP	16	41.204.224.38	2008	Process not Found
Destination IP	22	192.227.173.56	2008	Process not Found
Destination IP	27	41.204.224.38	2008	Process not Found
Destination IP	28	192.227.173.56	2008	Process not Found
Destination IP	9	192.227.173.56	2008	Process not Found
Destination IP	21	41.204.224.38	2008	Process not Found
Destination IP	24	192.227.173.56	2008	Process not Found
Destination IP	25	41.204.224.38	2472	Umbral.exe
Destination IP	26	192.227.173.56	2472	Umbral.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
1660	powershell.exe

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

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
2228	ipconfig.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1660	powershell.exe
1660	powershell.exe

Suspicious use of AdjustPrivilegeToken 44 IoCs

description	pid	Process
Token: SeDebugPrivilege	1660	powershell.exe
Token: SeIncreaseQuotaPrivilege	1660	powershell.exe
Token: SeSecurityPrivilege	1660	powershell.exe
Token: SeTakeOwnershipPrivilege	1660	powershell.exe
Token: SeLoadDriverPrivilege	1660	powershell.exe
Token: SeSystemProfilePrivilege	1660	powershell.exe
Token: SeSystemtimePrivilege	1660	powershell.exe
Token: SeProfSingleProcessPrivilege	1660	powershell.exe
Token: SeIncBasePriorityPrivilege	1660	powershell.exe
Token: SeCreatePagefilePrivilege	1660	powershell.exe
Token: SeBackupPrivilege	1660	powershell.exe
Token: SeRestorePrivilege	1660	powershell.exe
Token: SeShutdownPrivilege	1660	powershell.exe
Token: SeDebugPrivilege	1660	powershell.exe
Token: SeSystemEnvironmentPrivilege	1660	powershell.exe
Token: SeRemoteShutdownPrivilege	1660	powershell.exe
Token: SeUndockPrivilege	1660	powershell.exe
Token: SeManageVolumePrivilege	1660	powershell.exe
Token: 33	1660	powershell.exe
Token: 34	1660	powershell.exe
Token: 35	1660	powershell.exe
Token: 36	1660	powershell.exe
Token: SeIncreaseQuotaPrivilege	1660	powershell.exe
Token: SeSecurityPrivilege	1660	powershell.exe
Token: SeTakeOwnershipPrivilege	1660	powershell.exe
Token: SeLoadDriverPrivilege	1660	powershell.exe
Token: SeSystemProfilePrivilege	1660	powershell.exe
Token: SeSystemtimePrivilege	1660	powershell.exe
Token: SeProfSingleProcessPrivilege	1660	powershell.exe
Token: SeIncBasePriorityPrivilege	1660	powershell.exe
Token: SeCreatePagefilePrivilege	1660	powershell.exe
Token: SeBackupPrivilege	1660	powershell.exe
Token: SeRestorePrivilege	1660	powershell.exe
Token: SeShutdownPrivilege	1660	powershell.exe
Token: SeDebugPrivilege	1660	powershell.exe
Token: SeSystemEnvironmentPrivilege	1660	powershell.exe
Token: SeRemoteShutdownPrivilege	1660	powershell.exe
Token: SeUndockPrivilege	1660	powershell.exe
Token: SeManageVolumePrivilege	1660	powershell.exe
Token: 33	1660	powershell.exe
Token: 34	1660	powershell.exe
Token: 35	1660	powershell.exe
Token: 36	1660	powershell.exe
Token: SeDebugPrivilege	2472	Umbral.exe

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 3524 wrote to memory of 1852	3524	cmd.exe	83
PID 3524 wrote to memory of 1852	3524	cmd.exe	83
PID 3524 wrote to memory of 1660	3524	cmd.exe	84
PID 3524 wrote to memory of 1660	3524	cmd.exe	84
PID 3524 wrote to memory of 2228	3524	cmd.exe	88
PID 3524 wrote to memory of 2228	3524	cmd.exe	88
PID 3524 wrote to memory of 4496	3524	cmd.exe	89
PID 3524 wrote to memory of 4496	3524	cmd.exe	89
PID 3524 wrote to memory of 4496	3524	cmd.exe	89
PID 4496 wrote to memory of 2472	4496	KRX Client.exe	90
PID 4496 wrote to memory of 2472	4496	KRX Client.exe	90
PID 4496 wrote to memory of 4376	4496	KRX Client.exe	91
PID 4496 wrote to memory of 4376	4496	KRX Client.exe	91

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"
1⤵
- Suspicious use of WriteProcessMemory
PID:3524
- C:\Windows\system32\openfiles.exe
  openfiles
  2⤵
  PID:1852
- 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:1660
- C:\Windows\system32\ipconfig.exe
  ipconfig /flushdns
  2⤵
  - Gathers network information
  PID:2228
- C:\Users\Admin\AppData\Local\Temp\krx\krx\KRX Client.exe
  "C:\Users\Admin\AppData\Local\Temp\krx\krx/KRX Client.exe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4496
- - C:\Users\Admin\AppData\Local\Temp\Umbral.exe
    "C:\Users\Admin\AppData\Local\Temp\Umbral.exe"
    3⤵
    - Executes dropped EXE
    - Unexpected DNS network traffic destination
    - Suspicious use of AdjustPrivilegeToken
    PID:2472
- - C:\Users\Admin\AppData\Local\Temp\KRX Client.exe
    "C:\Users\Admin\AppData\Local\Temp\KRX Client.exe"
    3⤵
    - Executes dropped EXE
    PID:4376

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

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

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\Local\Temp\__PSScriptPolicyTest_trzae52y.m2z.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1660-10-0x0000015040410000-0x0000015040432000-memory.dmp

Filesize
136KB

Download
memory/1660-12-0x00007FF90FE10000-0x00007FF9108D1000-memory.dmp

Filesize
10.8MB

Download
memory/1660-13-0x00007FF90FE10000-0x00007FF9108D1000-memory.dmp

Filesize
10.8MB

Download
memory/1660-14-0x0000015058800000-0x0000015058810000-memory.dmp

Filesize
64KB

Download
memory/1660-15-0x0000015058830000-0x000001505884A000-memory.dmp

Filesize
104KB

Download
memory/1660-17-0x00007FF90FE10000-0x00007FF9108D1000-memory.dmp

Filesize
10.8MB

Download
memory/1660-0-0x00007FF90FE13000-0x00007FF90FE15000-memory.dmp

Filesize
8KB

Download
memory/1660-11-0x00007FF90FE10000-0x00007FF9108D1000-memory.dmp

Filesize
10.8MB

Download
memory/2472-30-0x00000232733D0000-0x0000023273410000-memory.dmp

Filesize
256KB

Download
memory/4376-40-0x0000000140000000-0x0000000142086000-memory.dmp

Filesize
32.5MB

Download