umbral | 4cc1f9f24687b31979df108d1cb40b332b2b867aa004314b3844fc9388051d10

Analysis

max time kernel
121s
max time network
138s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-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

Extracted

Family

umbral

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

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral1/files/0x0008000000003683-16.dat	family_umbral
behavioral1/memory/2732-27-0x0000000000C10000-0x0000000000C50000-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
2732	Umbral.exe
2752	KRX Client.exe

Loads dropped DLL 2 IoCs

pid	Process
2884	KRX Client.exe
2884	KRX Client.exe

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

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
2832	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
2704	ipconfig.exe

Suspicious behavior: CmdExeWriteProcessMemorySpam 1 IoCs

pid	Process
2884	KRX Client.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2832	powershell.exe

Suspicious use of AdjustPrivilegeToken 42 IoCs

description	pid	Process
Token: SeDebugPrivilege	2832	powershell.exe
Token: SeDebugPrivilege	2732	Umbral.exe
Token: SeIncreaseQuotaPrivilege	112	wmic.exe
Token: SeSecurityPrivilege	112	wmic.exe
Token: SeTakeOwnershipPrivilege	112	wmic.exe
Token: SeLoadDriverPrivilege	112	wmic.exe
Token: SeSystemProfilePrivilege	112	wmic.exe
Token: SeSystemtimePrivilege	112	wmic.exe
Token: SeProfSingleProcessPrivilege	112	wmic.exe
Token: SeIncBasePriorityPrivilege	112	wmic.exe
Token: SeCreatePagefilePrivilege	112	wmic.exe
Token: SeBackupPrivilege	112	wmic.exe
Token: SeRestorePrivilege	112	wmic.exe
Token: SeShutdownPrivilege	112	wmic.exe
Token: SeDebugPrivilege	112	wmic.exe
Token: SeSystemEnvironmentPrivilege	112	wmic.exe
Token: SeRemoteShutdownPrivilege	112	wmic.exe
Token: SeUndockPrivilege	112	wmic.exe
Token: SeManageVolumePrivilege	112	wmic.exe
Token: 33	112	wmic.exe
Token: 34	112	wmic.exe
Token: 35	112	wmic.exe
Token: SeIncreaseQuotaPrivilege	112	wmic.exe
Token: SeSecurityPrivilege	112	wmic.exe
Token: SeTakeOwnershipPrivilege	112	wmic.exe
Token: SeLoadDriverPrivilege	112	wmic.exe
Token: SeSystemProfilePrivilege	112	wmic.exe
Token: SeSystemtimePrivilege	112	wmic.exe
Token: SeProfSingleProcessPrivilege	112	wmic.exe
Token: SeIncBasePriorityPrivilege	112	wmic.exe
Token: SeCreatePagefilePrivilege	112	wmic.exe
Token: SeBackupPrivilege	112	wmic.exe
Token: SeRestorePrivilege	112	wmic.exe
Token: SeShutdownPrivilege	112	wmic.exe
Token: SeDebugPrivilege	112	wmic.exe
Token: SeSystemEnvironmentPrivilege	112	wmic.exe
Token: SeRemoteShutdownPrivilege	112	wmic.exe
Token: SeUndockPrivilege	112	wmic.exe
Token: SeManageVolumePrivilege	112	wmic.exe
Token: 33	112	wmic.exe
Token: 34	112	wmic.exe
Token: 35	112	wmic.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 2352 wrote to memory of 2168	2352	cmd.exe	31
PID 2352 wrote to memory of 2168	2352	cmd.exe	31
PID 2352 wrote to memory of 2168	2352	cmd.exe	31
PID 2352 wrote to memory of 2832	2352	cmd.exe	32
PID 2352 wrote to memory of 2832	2352	cmd.exe	32
PID 2352 wrote to memory of 2832	2352	cmd.exe	32
PID 2352 wrote to memory of 2704	2352	cmd.exe	33
PID 2352 wrote to memory of 2704	2352	cmd.exe	33
PID 2352 wrote to memory of 2704	2352	cmd.exe	33
PID 2352 wrote to memory of 2884	2352	cmd.exe	34
PID 2352 wrote to memory of 2884	2352	cmd.exe	34
PID 2352 wrote to memory of 2884	2352	cmd.exe	34
PID 2352 wrote to memory of 2884	2352	cmd.exe	34
PID 2884 wrote to memory of 2732	2884	KRX Client.exe	35
PID 2884 wrote to memory of 2732	2884	KRX Client.exe	35
PID 2884 wrote to memory of 2732	2884	KRX Client.exe	35
PID 2884 wrote to memory of 2732	2884	KRX Client.exe	35
PID 2884 wrote to memory of 2752	2884	KRX Client.exe	36
PID 2884 wrote to memory of 2752	2884	KRX Client.exe	36
PID 2884 wrote to memory of 2752	2884	KRX Client.exe	36
PID 2884 wrote to memory of 2752	2884	KRX Client.exe	36
PID 2732 wrote to memory of 112	2732	Umbral.exe	37
PID 2732 wrote to memory of 112	2732	Umbral.exe	37
PID 2732 wrote to memory of 112	2732	Umbral.exe	37

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:2352
- C:\Windows\system32\openfiles.exe
  openfiles
  2⤵
  PID:2168
- 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:2832
- C:\Windows\system32\ipconfig.exe
  ipconfig /flushdns
  2⤵
  - Gathers network information
  PID:2704
- 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:2884
- - C:\Users\Admin\AppData\Local\Temp\Umbral.exe
    "C:\Users\Admin\AppData\Local\Temp\Umbral.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2732
  - - C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      4⤵
      Suspicious use of AdjustPrivilegeToken
      PID:112
- - C:\Users\Admin\AppData\Local\Temp\KRX Client.exe
    "C:\Users\Admin\AppData\Local\Temp\KRX Client.exe"
    3⤵
    - Executes dropped EXE
    PID:2752

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

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Downloads

\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/2732-27-0x0000000000C10000-0x0000000000C50000-memory.dmp

Filesize
256KB

Download
memory/2752-26-0x0000000140000000-0x0000000142086000-memory.dmp

Filesize
32.5MB

Download
memory/2832-6-0x0000000002410000-0x0000000002418000-memory.dmp

Filesize
32KB

Download
memory/2832-9-0x000007FEF6260000-0x000007FEF6BFD000-memory.dmp

Filesize
9.6MB

Download
memory/2832-10-0x000007FEF6260000-0x000007FEF6BFD000-memory.dmp

Filesize
9.6MB

Download
memory/2832-11-0x000007FEF6260000-0x000007FEF6BFD000-memory.dmp

Filesize
9.6MB

Download
memory/2832-12-0x000007FEF6260000-0x000007FEF6BFD000-memory.dmp

Filesize
9.6MB

Download
memory/2832-8-0x000007FEF6260000-0x000007FEF6BFD000-memory.dmp

Filesize
9.6MB

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memory/2832-4-0x000007FEF651E000-0x000007FEF651F000-memory.dmp

Filesize
4KB

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memory/2832-7-0x000007FEF6260000-0x000007FEF6BFD000-memory.dmp

Filesize
9.6MB

Download
memory/2832-5-0x000000001B310000-0x000000001B5F2000-memory.dmp

Filesize
2.9MB

Download
memory/2884-29-0x0000000003280000-0x0000000005306000-memory.dmp

Filesize
32.5MB

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