umbral | 82079439ea37f00ae94dd9c3b525fe70c7df25f1958bcb480a59a50cabd8f45e

Analysis

max time kernel
14s
max time network
16s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-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
behavioral1/files/0x0029000000045050-8.dat	family_umbral
behavioral1/memory/1876-32-0x000001C07D010000-0x000001C07D050000-memory.dmp	family_umbral

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral1/files/0x0028000000045057-19.dat	family_xworm
behavioral1/memory/2156-35-0x0000000000370000-0x0000000000388000-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
3400	powershell.exe
700	powershell.exe
1932	powershell.exe
2164	powershell.exe

Checks computer location settings 2 TTPs 2 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-1-5-21-3495501434-311648039-2993076821-1000\Control Panel\International\Geo\Nation	External_setup.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3495501434-311648039-2993076821-1000\Control Panel\International\Geo\Nation	EXTERNAL..exe

Drops startup file 2 IoCs

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

Executes dropped EXE 2 IoCs

pid	Process
1876	external.exe
2156	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-1-5-21-3495501434-311648039-2993076821-1000\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
17	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 13 IoCs

pid	Process
3840	wmic.exe
3840	wmic.exe
3840	wmic.exe
3840	wmic.exe
3400	powershell.exe
3400	powershell.exe
700	powershell.exe
700	powershell.exe
1932	powershell.exe
1932	powershell.exe
2164	powershell.exe
2164	powershell.exe
2156	EXTERNAL..exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2156	EXTERNAL..exe
Token: SeDebugPrivilege	1876	external.exe
Token: SeIncreaseQuotaPrivilege	3840	wmic.exe
Token: SeSecurityPrivilege	3840	wmic.exe
Token: SeTakeOwnershipPrivilege	3840	wmic.exe
Token: SeLoadDriverPrivilege	3840	wmic.exe
Token: SeSystemProfilePrivilege	3840	wmic.exe
Token: SeSystemtimePrivilege	3840	wmic.exe
Token: SeProfSingleProcessPrivilege	3840	wmic.exe
Token: SeIncBasePriorityPrivilege	3840	wmic.exe
Token: SeCreatePagefilePrivilege	3840	wmic.exe
Token: SeBackupPrivilege	3840	wmic.exe
Token: SeRestorePrivilege	3840	wmic.exe
Token: SeShutdownPrivilege	3840	wmic.exe
Token: SeDebugPrivilege	3840	wmic.exe
Token: SeSystemEnvironmentPrivilege	3840	wmic.exe
Token: SeRemoteShutdownPrivilege	3840	wmic.exe
Token: SeUndockPrivilege	3840	wmic.exe
Token: SeManageVolumePrivilege	3840	wmic.exe
Token: 33	3840	wmic.exe
Token: 34	3840	wmic.exe
Token: 35	3840	wmic.exe
Token: 36	3840	wmic.exe
Token: SeIncreaseQuotaPrivilege	3840	wmic.exe
Token: SeSecurityPrivilege	3840	wmic.exe
Token: SeTakeOwnershipPrivilege	3840	wmic.exe
Token: SeLoadDriverPrivilege	3840	wmic.exe
Token: SeSystemProfilePrivilege	3840	wmic.exe
Token: SeSystemtimePrivilege	3840	wmic.exe
Token: SeProfSingleProcessPrivilege	3840	wmic.exe
Token: SeIncBasePriorityPrivilege	3840	wmic.exe
Token: SeCreatePagefilePrivilege	3840	wmic.exe
Token: SeBackupPrivilege	3840	wmic.exe
Token: SeRestorePrivilege	3840	wmic.exe
Token: SeShutdownPrivilege	3840	wmic.exe
Token: SeDebugPrivilege	3840	wmic.exe
Token: SeSystemEnvironmentPrivilege	3840	wmic.exe
Token: SeRemoteShutdownPrivilege	3840	wmic.exe
Token: SeUndockPrivilege	3840	wmic.exe
Token: SeManageVolumePrivilege	3840	wmic.exe
Token: 33	3840	wmic.exe
Token: 34	3840	wmic.exe
Token: 35	3840	wmic.exe
Token: 36	3840	wmic.exe
Token: SeDebugPrivilege	3400	powershell.exe
Token: SeIncreaseQuotaPrivilege	3400	powershell.exe
Token: SeSecurityPrivilege	3400	powershell.exe
Token: SeTakeOwnershipPrivilege	3400	powershell.exe
Token: SeLoadDriverPrivilege	3400	powershell.exe
Token: SeSystemProfilePrivilege	3400	powershell.exe
Token: SeSystemtimePrivilege	3400	powershell.exe
Token: SeProfSingleProcessPrivilege	3400	powershell.exe
Token: SeIncBasePriorityPrivilege	3400	powershell.exe
Token: SeCreatePagefilePrivilege	3400	powershell.exe
Token: SeBackupPrivilege	3400	powershell.exe
Token: SeRestorePrivilege	3400	powershell.exe
Token: SeShutdownPrivilege	3400	powershell.exe
Token: SeDebugPrivilege	3400	powershell.exe
Token: SeSystemEnvironmentPrivilege	3400	powershell.exe
Token: SeRemoteShutdownPrivilege	3400	powershell.exe
Token: SeUndockPrivilege	3400	powershell.exe
Token: SeManageVolumePrivilege	3400	powershell.exe
Token: 33	3400	powershell.exe
Token: 34	3400	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2156	EXTERNAL..exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3644 wrote to memory of 1876	3644	External_setup.exe	82
PID 3644 wrote to memory of 1876	3644	External_setup.exe	82
PID 3644 wrote to memory of 2156	3644	External_setup.exe	83
PID 3644 wrote to memory of 2156	3644	External_setup.exe	83
PID 1876 wrote to memory of 3840	1876	external.exe	84
PID 1876 wrote to memory of 3840	1876	external.exe	84
PID 2156 wrote to memory of 3400	2156	EXTERNAL..exe	90
PID 2156 wrote to memory of 3400	2156	EXTERNAL..exe	90
PID 2156 wrote to memory of 700	2156	EXTERNAL..exe	93
PID 2156 wrote to memory of 700	2156	EXTERNAL..exe	93
PID 2156 wrote to memory of 1932	2156	EXTERNAL..exe	95
PID 2156 wrote to memory of 1932	2156	EXTERNAL..exe	95
PID 2156 wrote to memory of 2164	2156	EXTERNAL..exe	98
PID 2156 wrote to memory of 2164	2156	EXTERNAL..exe	98

C:\Users\Admin\AppData\Local\Temp\External_setup.exe
"C:\Users\Admin\AppData\Local\Temp\External_setup.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3644
- 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:1876
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3840
- C:\Users\Admin\AppData\Local\Temp\EXTERNAL..exe
  "C:\Users\Admin\AppData\Local\Temp\EXTERNAL..exe"
  2⤵
  - Checks computer location settings
  - 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:2156
- - 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:3400
- - 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
    PID:700
- - 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
    PID:1932
- - 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
    PID:2164

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

Query Registry

T1012

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
3KB

MD5
3eb3833f769dd890afc295b977eab4b4

SHA1
e857649b037939602c72ad003e5d3698695f436f

SHA256
c485a6e2fd17c342fca60060f47d6a5655a65a412e35e001bb5bf88d96e6e485

SHA512
c24bbc8f278478d43756807b8c584d4e3fb2289db468bc92986a489f74a8da386a667a758360a397e77e018e363be8912ac260072fa3e31117ad0599ac749e72

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

Filesize
1KB

MD5
c67441dfa09f61bca500bb43407c56b8

SHA1
5a56cf7cbeb48c109e2128c31b681fac3959157b

SHA256
63082da456c124d0bc516d2161d1613db5f3008d903e4066d2c7b4e90b435f33

SHA512
325de8b718b3a01df05e20e028c5882240e5fd2e96c771361b776312923ff178f27494a1f5249bf6d7365a99155eb8735a51366e85597008e6a10462e63ee0e8

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

Filesize
1KB

MD5
eb34f2910d4089a120743cb42e36d6b3

SHA1
dba916392147a6338eb152ae439c2a70fedeb857

SHA256
a60141d790f2dbb58eaa48c492c25d6d49a56601b666c1d1badf9699e145c8b9

SHA512
beefe6f86761fae17fd3383114201da575322e95360299f9197b38077f83d96f7b3544085caf860c94b8879b303d44b8a981ed012a758e648dd78840a835463d

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

Filesize
1KB

MD5
7c158abde411c60baf274b566956a725

SHA1
84d36e6f76a317a292be6f5abb45de73a7d514a7

SHA256
e7d7cba34e0cde8d1df91ffafef520c9cb06671a12f1cf605f1398be35dc5370

SHA512
f5681e485d8f95dadd0eb1a0b4e279965101ff0eb26ff298ac497bb6f9cb45d172ef241706a3d0237301c254e7cc821d65b041a35937e4aff3c455c972b8bb6f

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_c2l5vnw2.jnf.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/1876-40-0x00007FFD12EE0000-0x00007FFD139A2000-memory.dmp

Filesize
10.8MB

Download
memory/1876-32-0x000001C07D010000-0x000001C07D050000-memory.dmp

Filesize
256KB

Download
memory/1876-34-0x00007FFD12EE0000-0x00007FFD139A2000-memory.dmp

Filesize
10.8MB

Download
memory/2156-36-0x00007FFD12EE0000-0x00007FFD139A2000-memory.dmp

Filesize
10.8MB

Download
memory/2156-35-0x0000000000370000-0x0000000000388000-memory.dmp

Filesize
96KB

Download
memory/2156-91-0x00007FFD12EE0000-0x00007FFD139A2000-memory.dmp

Filesize
10.8MB

Download
memory/3400-50-0x00000228EFF20000-0x00000228EFF42000-memory.dmp

Filesize
136KB

Download
memory/3644-38-0x00007FFD12EE0000-0x00007FFD139A2000-memory.dmp

Filesize
10.8MB

Download
memory/3644-0-0x00007FFD12EE3000-0x00007FFD12EE5000-memory.dmp

Filesize
8KB

Download
memory/3644-3-0x00007FFD12EE0000-0x00007FFD139A2000-memory.dmp

Filesize
10.8MB

Download
memory/3644-1-0x0000000000370000-0x0000000000398000-memory.dmp

Filesize
160KB

Download