umbral | 91399415beee17d491d473ac161b7ea012308d1003e1977c6d20a97f45f92e8f

Analysis

max time kernel
149s
max time network
153s
platform
windows7_x64
resource
win7-20241010-en
resource tags

arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
submitted
10-11-2024 18:08

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General

Target

RustAnticheat.exe
Size

1.1MB
MD5

4da1cae5b285cef6559d833dfdd47d97
SHA1

b0a10457c591d30b6306cb93ecf78bea8e85c10f
SHA256

c8debc191b353c4acc61bdc8c29df7b236067e8a8b609da656cc503d00fe1e25
SHA512

f55526f2d77077f7dfec9d963170277aa947d1f07edf96f2846dc373c7349b9362d3d1b3b157bf34729746c9038f41a164c72e293501e66ce6cb40db875c7243
SSDEEP

24576:r4feY2fpThsGUC+Krr90PvaOEO6ibCsBh0bpquR:0fp2fp1ZB+K0PvNEICvb

Score

10^/10

umbral xworm discovery execution persistence rat stealer trojan

Malware Config

Extracted

Family

xworm

web-amend.gl.at.ply.gg:59501

Attributes

Install_directory
%Userprofile%
install_file
RuntimeBroker.exe

Extracted

Family

umbral

https://discord.com/api/webhooks/1293267568387297385/WnO2JpSDfCRQ711ulFEFqRGEAxQtGu6PY1WvGbXedBOHjDSr2YGy9Y9KUdqEG9zICeAa

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral1/files/0x0008000000019515-11.dat	family_umbral
behavioral1/memory/2804-15-0x0000000000EA0000-0x0000000000EE0000-memory.dmp	family_umbral

Detect Xworm Payload 3 IoCs

resource	yara_rule
behavioral1/files/0x0003000000018334-5.dat	family_xworm
behavioral1/memory/2200-9-0x0000000000D30000-0x0000000000D4A000-memory.dmp	family_xworm
behavioral1/memory/3040-61-0x0000000001210000-0x000000000122A000-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
3060	powershell.exe
1776	powershell.exe
2144	powershell.exe
2460	powershell.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 5 IoCs

pid	Process
2200	RuntimeBroker.exe
2804	Umbral.exe
2832	Loader (1).exe
3040	RuntimeBroker.exe
1648	RuntimeBroker.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-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "C:\\Users\\Admin\\RuntimeBroker.exe"	RuntimeBroker.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

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 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	Loader (1).exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
2104	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
3060	powershell.exe
1776	powershell.exe
2144	powershell.exe
2460	powershell.exe
2200	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 49 IoCs

description	pid	Process
Token: SeDebugPrivilege	2200	RuntimeBroker.exe
Token: SeDebugPrivilege	2804	Umbral.exe
Token: SeDebugPrivilege	3060	powershell.exe
Token: SeIncreaseQuotaPrivilege	1028	wmic.exe
Token: SeSecurityPrivilege	1028	wmic.exe
Token: SeTakeOwnershipPrivilege	1028	wmic.exe
Token: SeLoadDriverPrivilege	1028	wmic.exe
Token: SeSystemProfilePrivilege	1028	wmic.exe
Token: SeSystemtimePrivilege	1028	wmic.exe
Token: SeProfSingleProcessPrivilege	1028	wmic.exe
Token: SeIncBasePriorityPrivilege	1028	wmic.exe
Token: SeCreatePagefilePrivilege	1028	wmic.exe
Token: SeBackupPrivilege	1028	wmic.exe
Token: SeRestorePrivilege	1028	wmic.exe
Token: SeShutdownPrivilege	1028	wmic.exe
Token: SeDebugPrivilege	1028	wmic.exe
Token: SeSystemEnvironmentPrivilege	1028	wmic.exe
Token: SeRemoteShutdownPrivilege	1028	wmic.exe
Token: SeUndockPrivilege	1028	wmic.exe
Token: SeManageVolumePrivilege	1028	wmic.exe
Token: 33	1028	wmic.exe
Token: 34	1028	wmic.exe
Token: 35	1028	wmic.exe
Token: SeIncreaseQuotaPrivilege	1028	wmic.exe
Token: SeSecurityPrivilege	1028	wmic.exe
Token: SeTakeOwnershipPrivilege	1028	wmic.exe
Token: SeLoadDriverPrivilege	1028	wmic.exe
Token: SeSystemProfilePrivilege	1028	wmic.exe
Token: SeSystemtimePrivilege	1028	wmic.exe
Token: SeProfSingleProcessPrivilege	1028	wmic.exe
Token: SeIncBasePriorityPrivilege	1028	wmic.exe
Token: SeCreatePagefilePrivilege	1028	wmic.exe
Token: SeBackupPrivilege	1028	wmic.exe
Token: SeRestorePrivilege	1028	wmic.exe
Token: SeShutdownPrivilege	1028	wmic.exe
Token: SeDebugPrivilege	1028	wmic.exe
Token: SeSystemEnvironmentPrivilege	1028	wmic.exe
Token: SeRemoteShutdownPrivilege	1028	wmic.exe
Token: SeUndockPrivilege	1028	wmic.exe
Token: SeManageVolumePrivilege	1028	wmic.exe
Token: 33	1028	wmic.exe
Token: 34	1028	wmic.exe
Token: 35	1028	wmic.exe
Token: SeDebugPrivilege	1776	powershell.exe
Token: SeDebugPrivilege	2144	powershell.exe
Token: SeDebugPrivilege	2460	powershell.exe
Token: SeDebugPrivilege	2200	RuntimeBroker.exe
Token: SeDebugPrivilege	3040	RuntimeBroker.exe
Token: SeDebugPrivilege	1648	RuntimeBroker.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2200	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 34 IoCs

description	pid	Process	procid_target
PID 2536 wrote to memory of 2200	2536	RustAnticheat.exe	30
PID 2536 wrote to memory of 2200	2536	RustAnticheat.exe	30
PID 2536 wrote to memory of 2200	2536	RustAnticheat.exe	30
PID 2536 wrote to memory of 2804	2536	RustAnticheat.exe	31
PID 2536 wrote to memory of 2804	2536	RustAnticheat.exe	31
PID 2536 wrote to memory of 2804	2536	RustAnticheat.exe	31
PID 2536 wrote to memory of 2832	2536	RustAnticheat.exe	32
PID 2536 wrote to memory of 2832	2536	RustAnticheat.exe	32
PID 2536 wrote to memory of 2832	2536	RustAnticheat.exe	32
PID 2536 wrote to memory of 2832	2536	RustAnticheat.exe	32
PID 2200 wrote to memory of 3060	2200	RuntimeBroker.exe	33
PID 2200 wrote to memory of 3060	2200	RuntimeBroker.exe	33
PID 2200 wrote to memory of 3060	2200	RuntimeBroker.exe	33
PID 2804 wrote to memory of 1028	2804	Umbral.exe	36
PID 2804 wrote to memory of 1028	2804	Umbral.exe	36
PID 2804 wrote to memory of 1028	2804	Umbral.exe	36
PID 2200 wrote to memory of 1776	2200	RuntimeBroker.exe	39
PID 2200 wrote to memory of 1776	2200	RuntimeBroker.exe	39
PID 2200 wrote to memory of 1776	2200	RuntimeBroker.exe	39
PID 2200 wrote to memory of 2144	2200	RuntimeBroker.exe	41
PID 2200 wrote to memory of 2144	2200	RuntimeBroker.exe	41
PID 2200 wrote to memory of 2144	2200	RuntimeBroker.exe	41
PID 2200 wrote to memory of 2460	2200	RuntimeBroker.exe	43
PID 2200 wrote to memory of 2460	2200	RuntimeBroker.exe	43
PID 2200 wrote to memory of 2460	2200	RuntimeBroker.exe	43
PID 2200 wrote to memory of 2104	2200	RuntimeBroker.exe	45
PID 2200 wrote to memory of 2104	2200	RuntimeBroker.exe	45
PID 2200 wrote to memory of 2104	2200	RuntimeBroker.exe	45
PID 1604 wrote to memory of 3040	1604	taskeng.exe	48
PID 1604 wrote to memory of 3040	1604	taskeng.exe	48
PID 1604 wrote to memory of 3040	1604	taskeng.exe	48
PID 1604 wrote to memory of 1648	1604	taskeng.exe	50
PID 1604 wrote to memory of 1648	1604	taskeng.exe	50
PID 1604 wrote to memory of 1648	1604	taskeng.exe	50

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\RustAnticheat.exe
"C:\Users\Admin\AppData\Local\Temp\RustAnticheat.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2536
- C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe
  "C:\Users\Admin\AppData\Roaming\RuntimeBroker.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:2200
- - 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\Roaming\RuntimeBroker.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3060
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'RuntimeBroker.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1776
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\RuntimeBroker.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2144
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'RuntimeBroker.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2460
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "RuntimeBroker" /tr "C:\Users\Admin\RuntimeBroker.exe"
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:2104
- C:\Users\Admin\AppData\Roaming\Umbral.exe
  "C:\Users\Admin\AppData\Roaming\Umbral.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2804
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:1028
- C:\Users\Admin\AppData\Roaming\Loader (1).exe
  "C:\Users\Admin\AppData\Roaming\Loader (1).exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  PID:2832

C:\Windows\system32\taskeng.exe
taskeng.exe {698321DD-8998-4794-8629-F6E0BC90C7D2} S-1-5-21-3692679935-4019334568-335155002-1000:BCXRJFKE\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1604
- C:\Users\Admin\RuntimeBroker.exe
  C:\Users\Admin\RuntimeBroker.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:3040
- C:\Users\Admin\RuntimeBroker.exe
  C:\Users\Admin\RuntimeBroker.exe
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1648

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Modify Registry

T1112

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

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Downloads

C:\Users\Admin\AppData\Roaming\Loader (1).exe

Filesize
827KB

MD5
eefb801774c5ccb44153268a9357f5f1

SHA1
b1906b22e14edd142c52808ab3e5ba9346b85de5

SHA256
677aeb1981c58cba41a5d53ccbbf5b471e62dc49dc326570767da940560d840d

SHA512
1cf162fe6184d68dca514059d2de1123e80d0faac401765a54224aa5a987c9454bc92263fbec566835aa7b402f1f63ba59bb425ccc139e0a7391e66991f270b7

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
41e624936251e7a1344c0b45beb9a5e9

SHA1
a2d11db35c2e0c1cac3ba49b79be42f33fe79cbd

SHA256
fe8962e19da95d180eeeda748b7142ed6fda7b7c49f9a265ffd97d1bd9ea3712

SHA512
3bb369ae15475da26070135a054fecfede3c9279ebad6d01f96fe08143aebf38144ae85bf6c66f67d4a2b0b4926dbfc1a9e8053e526743f6993b3a2b1e998b51

Download Submit
C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe

Filesize
76KB

MD5
6f1062dce3dec8fb8fd07ebb19b2a361

SHA1
7227015987ed8239aafeb76b196e733031dbcf69

SHA256
e38604ca74ccadfc6c4ace8cd0561655dc999f40c050ea01506347b61a631b1c

SHA512
c04c5d4678ab43fbac2af00cd46bb96f0d6cfca956a44ffdffee2761848f3f3383422936794efe9fda7b79c5aa0f424b341e00cf61be0d66d4ab8b7f56bfc5fe

Download Submit
C:\Users\Admin\AppData\Roaming\Umbral.exe

Filesize
231KB

MD5
488ac0c53981e66811a3d70587fd9625

SHA1
47c8f88a81a2ecf71c8770293767a515413ed553

SHA256
4bae1f2e27ba859066f7a63ce0634919b55416bcd9f38af3de0ecbdb4c7445ad

SHA512
19a5b5e87d197a2e7df16ba788803f2311762acd5fe9f32d3ff20f841d651258ab35abc7146fc5afd60c86837c597b2e2a964259521d860cd01b5f217a22a978

Download Submit
memory/1776-37-0x0000000001DF0000-0x0000000001DF8000-memory.dmp

Filesize
32KB

Download
memory/1776-36-0x000000001B2F0000-0x000000001B5D2000-memory.dmp

Filesize
2.9MB

Download
memory/2144-44-0x0000000002760000-0x0000000002768000-memory.dmp

Filesize
32KB

Download
memory/2144-43-0x000000001B230000-0x000000001B512000-memory.dmp

Filesize
2.9MB

Download
memory/2200-9-0x0000000000D30000-0x0000000000D4A000-memory.dmp

Filesize
104KB

Download
memory/2200-62-0x0000000000D20000-0x0000000000D2C000-memory.dmp

Filesize
48KB

Download
memory/2200-21-0x000007FEF55F0000-0x000007FEF5FDC000-memory.dmp

Filesize
9.9MB

Download
memory/2200-45-0x000007FEF55F0000-0x000007FEF5FDC000-memory.dmp

Filesize
9.9MB

Download
memory/2536-0-0x000007FEF55F3000-0x000007FEF55F4000-memory.dmp

Filesize
4KB

Download
memory/2536-1-0x00000000000D0000-0x00000000001F4000-memory.dmp

Filesize
1.1MB

Download
memory/2804-15-0x0000000000EA0000-0x0000000000EE0000-memory.dmp

Filesize
256KB

Download
memory/2832-23-0x0000000000430000-0x000000000043A000-memory.dmp

Filesize
40KB

Download
memory/2832-22-0x0000000000430000-0x000000000043A000-memory.dmp

Filesize
40KB

Download
memory/2832-52-0x0000000000430000-0x000000000043A000-memory.dmp

Filesize
40KB

Download
memory/2832-20-0x0000000000810000-0x00000000008E6000-memory.dmp

Filesize
856KB

Download
memory/3040-61-0x0000000001210000-0x000000000122A000-memory.dmp

Filesize
104KB

Download
memory/3060-30-0x00000000023A0000-0x00000000023A8000-memory.dmp

Filesize
32KB

Download
memory/3060-29-0x000000001B310000-0x000000001B5F2000-memory.dmp

Filesize
2.9MB

Download