umbral | 82079439ea37f00ae94dd9c3b525fe70c7df25f1958bcb480a59a50cabd8f45e

Analysis

max time kernel
15s
max time network
23s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
12-11-2024 11:06

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General

Target

External_setup.exe
Size

9.6MB
MD5

d0198efadc4c80311f0798f2a8bd68bf
SHA1

a8810606f7d910b0c5bccb3a5905e5ef3104cce1
SHA256

82079439ea37f00ae94dd9c3b525fe70c7df25f1958bcb480a59a50cabd8f45e
SHA512

0b098f92965896f8e6a8ab815a85c56c875c34f192b229456a60f30fbd13640e49189f77d0ca6bcb153b14eff6d7c6fd90b217b86a1c176b4640304198a9494a
SSDEEP

3072:lJsued2co1e2ZoL/R6wZ5Oyssuz//C0zrh9L0p:lBN71pi6fyG60Hh9L

Score

10^/10

umbral xworm execution persistence rat stealer trojan

Malware Config

Extracted

Family

xworm

127.0.0.1:4395

19.ip.gl.ply.gg:4395

Attributes

Install_directory
%Public%
install_file
Windows Security Host.exe

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral2/files/0x001a00000002abeb-6.dat	family_umbral
behavioral2/memory/3376-26-0x0000013EB5370000-0x0000013EB53B0000-memory.dmp	family_umbral

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/files/0x001a00000002abec-17.dat	family_xworm
behavioral2/memory/2744-28-0x0000000000B80000-0x0000000000B98000-memory.dmp	family_xworm

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral
Umbral family
umbral
Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Xworm family
xworm

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
2332	powershell.exe
4772	powershell.exe
2296	powershell.exe
2952	powershell.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Windows Security Host.lnk	EXTERNAL..exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Windows Security Host.lnk	EXTERNAL..exe

Executes dropped EXE 2 IoCs

pid	Process
3376	external.exe
2744	EXTERNAL..exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4018527317-446799424-2810249686-1000\Software\Microsoft\Windows\CurrentVersion\Run\Windows Security Host = "C:\\Users\\Public\\Windows Security Host.exe"	EXTERNAL..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
1	ip-api.com

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
2332	powershell.exe
2332	powershell.exe
4772	powershell.exe
4772	powershell.exe
2296	powershell.exe
2296	powershell.exe
2952	powershell.exe
2952	powershell.exe
2744	EXTERNAL..exe

Suspicious use of AdjustPrivilegeToken 49 IoCs

description	pid	Process
Token: SeDebugPrivilege	2744	EXTERNAL..exe
Token: SeDebugPrivilege	3376	external.exe
Token: SeIncreaseQuotaPrivilege	4588	wmic.exe
Token: SeSecurityPrivilege	4588	wmic.exe
Token: SeTakeOwnershipPrivilege	4588	wmic.exe
Token: SeLoadDriverPrivilege	4588	wmic.exe
Token: SeSystemProfilePrivilege	4588	wmic.exe
Token: SeSystemtimePrivilege	4588	wmic.exe
Token: SeProfSingleProcessPrivilege	4588	wmic.exe
Token: SeIncBasePriorityPrivilege	4588	wmic.exe
Token: SeCreatePagefilePrivilege	4588	wmic.exe
Token: SeBackupPrivilege	4588	wmic.exe
Token: SeRestorePrivilege	4588	wmic.exe
Token: SeShutdownPrivilege	4588	wmic.exe
Token: SeDebugPrivilege	4588	wmic.exe
Token: SeSystemEnvironmentPrivilege	4588	wmic.exe
Token: SeRemoteShutdownPrivilege	4588	wmic.exe
Token: SeUndockPrivilege	4588	wmic.exe
Token: SeManageVolumePrivilege	4588	wmic.exe
Token: 33	4588	wmic.exe
Token: 34	4588	wmic.exe
Token: 35	4588	wmic.exe
Token: 36	4588	wmic.exe
Token: SeIncreaseQuotaPrivilege	4588	wmic.exe
Token: SeSecurityPrivilege	4588	wmic.exe
Token: SeTakeOwnershipPrivilege	4588	wmic.exe
Token: SeLoadDriverPrivilege	4588	wmic.exe
Token: SeSystemProfilePrivilege	4588	wmic.exe
Token: SeSystemtimePrivilege	4588	wmic.exe
Token: SeProfSingleProcessPrivilege	4588	wmic.exe
Token: SeIncBasePriorityPrivilege	4588	wmic.exe
Token: SeCreatePagefilePrivilege	4588	wmic.exe
Token: SeBackupPrivilege	4588	wmic.exe
Token: SeRestorePrivilege	4588	wmic.exe
Token: SeShutdownPrivilege	4588	wmic.exe
Token: SeDebugPrivilege	4588	wmic.exe
Token: SeSystemEnvironmentPrivilege	4588	wmic.exe
Token: SeRemoteShutdownPrivilege	4588	wmic.exe
Token: SeUndockPrivilege	4588	wmic.exe
Token: SeManageVolumePrivilege	4588	wmic.exe
Token: 33	4588	wmic.exe
Token: 34	4588	wmic.exe
Token: 35	4588	wmic.exe
Token: 36	4588	wmic.exe
Token: SeDebugPrivilege	2332	powershell.exe
Token: SeDebugPrivilege	4772	powershell.exe
Token: SeDebugPrivilege	2296	powershell.exe
Token: SeDebugPrivilege	2952	powershell.exe
Token: SeDebugPrivilege	2744	EXTERNAL..exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2744	EXTERNAL..exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 1600 wrote to memory of 3376	1600	External_setup.exe	80
PID 1600 wrote to memory of 3376	1600	External_setup.exe	80
PID 1600 wrote to memory of 2744	1600	External_setup.exe	81
PID 1600 wrote to memory of 2744	1600	External_setup.exe	81
PID 3376 wrote to memory of 4588	3376	external.exe	82
PID 3376 wrote to memory of 4588	3376	external.exe	82
PID 2744 wrote to memory of 2332	2744	EXTERNAL..exe	85
PID 2744 wrote to memory of 2332	2744	EXTERNAL..exe	85
PID 2744 wrote to memory of 4772	2744	EXTERNAL..exe	87
PID 2744 wrote to memory of 4772	2744	EXTERNAL..exe	87
PID 2744 wrote to memory of 2296	2744	EXTERNAL..exe	89
PID 2744 wrote to memory of 2296	2744	EXTERNAL..exe	89
PID 2744 wrote to memory of 2952	2744	EXTERNAL..exe	91
PID 2744 wrote to memory of 2952	2744	EXTERNAL..exe	91

C:\Users\Admin\AppData\Local\Temp\External_setup.exe
"C:\Users\Admin\AppData\Local\Temp\External_setup.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1600
- C:\Users\Admin\AppData\Local\Temp\external.exe
  "C:\Users\Admin\AppData\Local\Temp\external.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3376
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:4588
- C:\Users\Admin\AppData\Local\Temp\EXTERNAL..exe
  "C:\Users\Admin\AppData\Local\Temp\EXTERNAL..exe"
  2⤵
  - Drops startup file
  - Executes dropped EXE
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2744
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\EXTERNAL..exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2332
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'EXTERNAL..exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4772
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Public\Windows Security Host.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2296
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Windows Security Host.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2952

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
627073ee3ca9676911bee35548eff2b8

SHA1
4c4b68c65e2cab9864b51167d710aa29ebdcff2e

SHA256
85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

SHA512
3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
2e8eb51096d6f6781456fef7df731d97

SHA1
ec2aaf851a618fb43c3d040a13a71997c25bda43

SHA256
96bfd9dd5883329927fe8c08b8956355a1a6ceb30ceeb5d4252b346df32bc864

SHA512
0a73dc9a49f92d9dd556c2ca2e36761890b3538f355ee1f013e7cf648d8c4d065f28046cd4a167db3dea304d1fbcbcea68d11ce6e12a3f20f8b6c018a60422d2

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
6f0e62045515b66d0a0105abc22dbf19

SHA1
894d685122f3f3c9a3457df2f0b12b0e851b394c

SHA256
529811e4d3496c559f3bd92cd877b93b719c3ac4834202aa76ab9e16e25f9319

SHA512
f78426df6032ee77f8c463446ab1c6bb4669ef7a2463dead831ec4ff83a07d7dc702d79372d8bcaf4594bf0fb6e11e9f027f3e0325de9b19be5f51b7b80ed54a

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
80b42fe4c6cf64624e6c31e5d7f2d3b3

SHA1
1f93e7dd83b86cb900810b7e3e43797868bf7d93

SHA256
ee20a5b38a6674366efda276dbbf0b43eb54efd282acfc1033042f6b53a80d4d

SHA512
83c1c744c15a8b427a1d3af677ec3bfd0353875a60fe886c41570981e17467ebbb59619b960ca8c5c3ab1430946b0633ea200b7e7d84ab6dca88b60c50055573

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

Filesize
67KB

MD5
23a1e1ce776f45109f8d83f0b5141289

SHA1
87c6f02ce7377d768f37eab580f28f30d0bf3988

SHA256
9453e6ad365e4000e2b51708260b926b85e9c3ba9cbdf00b113def08e64c9bd1

SHA512
f599b33a0a328ab208e814e20ef74ad926ebc9049911cf95943687a414852efdfb145d561e7dfb0cf378578dad76522a84fb7ffb8839d7a4b29c2c967012305d

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_hssv3rqs.qkb.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

Filesize
227KB

MD5
14710332a8810ef47ae406bdc38ba850

SHA1
fbffc8889614801b02ccd2ee6b0e89157fe45991

SHA256
e85ae204806791461c04de5d19ff512bbd2d3663ebaa0ebe3a9ae5b1faf99407

SHA512
6260ca6c6fd3baa92a86cd5ce0901efa06f2690ed98e0086a126a07d102b2810b192e55c46295805a1e7d261fa3721058ec5c22ba13e60bfa25f28ce6803c22a

Download Submit
memory/1600-0-0x00007FFE07293000-0x00007FFE07295000-memory.dmp

Filesize
8KB

Download
memory/1600-80-0x00007FFE07290000-0x00007FFE07D52000-memory.dmp

Filesize
10.8MB

Download
memory/1600-1-0x0000000000C80000-0x0000000000CA8000-memory.dmp

Filesize
160KB

Download
memory/1600-10-0x00007FFE07290000-0x00007FFE07D52000-memory.dmp

Filesize
10.8MB

Download
memory/2332-39-0x000001FAF98D0000-0x000001FAF98F2000-memory.dmp

Filesize
136KB

Download
memory/2744-30-0x00007FFE07290000-0x00007FFE07D52000-memory.dmp

Filesize
10.8MB

Download
memory/2744-28-0x0000000000B80000-0x0000000000B98000-memory.dmp

Filesize
96KB

Download
memory/2744-81-0x00007FFE07290000-0x00007FFE07D52000-memory.dmp

Filesize
10.8MB

Download
memory/3376-26-0x0000013EB5370000-0x0000013EB53B0000-memory.dmp

Filesize
256KB

Download
memory/3376-33-0x00007FFE07290000-0x00007FFE07D52000-memory.dmp

Filesize
10.8MB

Download
memory/3376-29-0x00007FFE07290000-0x00007FFE07D52000-memory.dmp

Filesize
10.8MB

Download