umbral | 8ba594fa7b1cc9bdc5fba532d40d6ed7bf291973e911c4be96cfc288b3554910

Analysis

max time kernel
50s
max time network
59s
platform
windows11-21h2_x64
resource
win11-20240802-en
resource tags

arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
submitted
25-09-2024 07:30

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Reason

Machine shutdown

Report Analysis Logs

General

Target

RustAnticheat.exe
Size

1.1MB
MD5

0d0d79a916d356823c4742f3253aa6aa
SHA1

5e267d313557b5dbf6c216e79190b20fb5ab8177
SHA256

20868115f180702553380c551df502535b8aa01c3ef630d408edd849896e631a
SHA512

9bbc72f3b647885dee27a27f5e30e2c845f5eb395bcf545ba7c75d65a0386f9c97dab4348a946fd693a90f4994550fda41a0528072cfeb8106ab603232573365
SSDEEP

24576:drAsHOi4ltSzmSEPGUSa/D3mIaCmo/NE1a1pvRQrhWgJbavyRAh79c0ih:5Lu1tSzmhR/nCo/K0pZQrE2RAh79Lih

Score

10^/10

umbral xworm discovery execution persistence rat stealer trojan

Malware Config

Extracted

Family

umbral

https://discord.com/api/webhooks/1288399761308782603/dBc32ufL91AjkI32Qso8IT_vaA0Frj3MP9_ivfjpfIEs4tXDc5SB89aA7LHc09xTZHZv

Extracted

Family

xworm

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

Attributes

Install_directory
%Userprofile%
install_file
USB.exe

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral4/files/0x000100000002aa1a-32.dat	family_umbral
behavioral4/memory/1200-37-0x000002054A6F0000-0x000002054A730000-memory.dmp	family_umbral

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral4/files/0x000600000002aa01-16.dat	family_xworm
behavioral4/memory/4856-36-0x0000000000ED0000-0x0000000000EEA000-memory.dmp	family_xworm

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral
Xworm
Xworm is a remote access trojan written in C#.
trojan rat 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
2600	powershell.exe
2120	powershell.exe
1264	powershell.exe
2292	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 4 IoCs

pid	Process
4300	Loader (1).exe
4856	RuntimeBroker.exe
1200	Litvin.exe
1564	RuntimeBroker

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-1-5-21-2842058299-443432012-2465494467-1000\Software\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "C:\\Users\\Admin\\RuntimeBroker"	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
3	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

Modifies data under HKEY_USERS 15 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent	LogonUI.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentPalette = 99ebff004cc2ff000091f8000078d4000067c000003e9200001a6800f7630c00	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColorBalance = "89"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\EnableWindowColorization = "14"	LogonUI.exe
Key created	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\AccentColor = "4292114432"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationBlurBalance = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationGlassAttribute = "1"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Themes\History\AutoColor = "0"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglowBalance = "10"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\StartColorMenu = "4290799360"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\Accent\AccentColorMenu = "4292114432"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationColor = "3288365268"	LogonUI.exe
Set value (int)	\REGISTRY\USER\.DEFAULT\Software\Microsoft\Windows\DWM\ColorizationAfterglow = "3288365268"	LogonUI.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
828	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
2600	powershell.exe
2600	powershell.exe
2120	powershell.exe
2120	powershell.exe
1264	powershell.exe
1264	powershell.exe
2292	powershell.exe
2292	powershell.exe
4856	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 52 IoCs

description	pid	Process
Token: SeDebugPrivilege	4856	RuntimeBroker.exe
Token: SeDebugPrivilege	1200	Litvin.exe
Token: SeIncreaseQuotaPrivilege	1256	wmic.exe
Token: SeSecurityPrivilege	1256	wmic.exe
Token: SeTakeOwnershipPrivilege	1256	wmic.exe
Token: SeLoadDriverPrivilege	1256	wmic.exe
Token: SeSystemProfilePrivilege	1256	wmic.exe
Token: SeSystemtimePrivilege	1256	wmic.exe
Token: SeProfSingleProcessPrivilege	1256	wmic.exe
Token: SeIncBasePriorityPrivilege	1256	wmic.exe
Token: SeCreatePagefilePrivilege	1256	wmic.exe
Token: SeBackupPrivilege	1256	wmic.exe
Token: SeRestorePrivilege	1256	wmic.exe
Token: SeShutdownPrivilege	1256	wmic.exe
Token: SeDebugPrivilege	1256	wmic.exe
Token: SeSystemEnvironmentPrivilege	1256	wmic.exe
Token: SeRemoteShutdownPrivilege	1256	wmic.exe
Token: SeUndockPrivilege	1256	wmic.exe
Token: SeManageVolumePrivilege	1256	wmic.exe
Token: 33	1256	wmic.exe
Token: 34	1256	wmic.exe
Token: 35	1256	wmic.exe
Token: 36	1256	wmic.exe
Token: SeIncreaseQuotaPrivilege	1256	wmic.exe
Token: SeSecurityPrivilege	1256	wmic.exe
Token: SeTakeOwnershipPrivilege	1256	wmic.exe
Token: SeLoadDriverPrivilege	1256	wmic.exe
Token: SeSystemProfilePrivilege	1256	wmic.exe
Token: SeSystemtimePrivilege	1256	wmic.exe
Token: SeProfSingleProcessPrivilege	1256	wmic.exe
Token: SeIncBasePriorityPrivilege	1256	wmic.exe
Token: SeCreatePagefilePrivilege	1256	wmic.exe
Token: SeBackupPrivilege	1256	wmic.exe
Token: SeRestorePrivilege	1256	wmic.exe
Token: SeShutdownPrivilege	1256	wmic.exe
Token: SeDebugPrivilege	1256	wmic.exe
Token: SeSystemEnvironmentPrivilege	1256	wmic.exe
Token: SeRemoteShutdownPrivilege	1256	wmic.exe
Token: SeUndockPrivilege	1256	wmic.exe
Token: SeManageVolumePrivilege	1256	wmic.exe
Token: 33	1256	wmic.exe
Token: 34	1256	wmic.exe
Token: 35	1256	wmic.exe
Token: 36	1256	wmic.exe
Token: SeDebugPrivilege	2600	powershell.exe
Token: SeDebugPrivilege	2120	powershell.exe
Token: SeDebugPrivilege	1264	powershell.exe
Token: SeDebugPrivilege	2292	powershell.exe
Token: SeDebugPrivilege	4856	RuntimeBroker.exe
Token: SeDebugPrivilege	1564	RuntimeBroker
Token: SeShutdownPrivilege	4560	shutdown.exe
Token: SeRemoteShutdownPrivilege	4560	shutdown.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4856	RuntimeBroker.exe
2536	LogonUI.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 420 wrote to memory of 4300	420	RustAnticheat.exe	78
PID 420 wrote to memory of 4300	420	RustAnticheat.exe	78
PID 420 wrote to memory of 4300	420	RustAnticheat.exe	78
PID 420 wrote to memory of 4856	420	RustAnticheat.exe	79
PID 420 wrote to memory of 4856	420	RustAnticheat.exe	79
PID 420 wrote to memory of 1200	420	RustAnticheat.exe	80
PID 420 wrote to memory of 1200	420	RustAnticheat.exe	80
PID 1200 wrote to memory of 1256	1200	Litvin.exe	81
PID 1200 wrote to memory of 1256	1200	Litvin.exe	81
PID 4856 wrote to memory of 2600	4856	RuntimeBroker.exe	85
PID 4856 wrote to memory of 2600	4856	RuntimeBroker.exe	85
PID 4856 wrote to memory of 2120	4856	RuntimeBroker.exe	87
PID 4856 wrote to memory of 2120	4856	RuntimeBroker.exe	87
PID 4856 wrote to memory of 1264	4856	RuntimeBroker.exe	89
PID 4856 wrote to memory of 1264	4856	RuntimeBroker.exe	89
PID 4856 wrote to memory of 2292	4856	RuntimeBroker.exe	91
PID 4856 wrote to memory of 2292	4856	RuntimeBroker.exe	91
PID 4856 wrote to memory of 828	4856	RuntimeBroker.exe	93
PID 4856 wrote to memory of 828	4856	RuntimeBroker.exe	93
PID 4856 wrote to memory of 4560	4856	RuntimeBroker.exe	96
PID 4856 wrote to memory of 4560	4856	RuntimeBroker.exe	96

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:420
- 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:4300
- 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:4856
- - 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:2600
- - 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:2120
- - 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'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1264
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'RuntimeBroker'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2292
- - 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"
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:828
- - C:\Windows\SYSTEM32\shutdown.exe
    shutdown.exe /f /s /t 0
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:4560
- C:\Users\Admin\AppData\Roaming\Litvin.exe
  "C:\Users\Admin\AppData\Roaming\Litvin.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1200
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:1256

C:\Users\Admin\RuntimeBroker
C:\Users\Admin\RuntimeBroker
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1564

C:\Windows\system32\LogonUI.exe
"LogonUI.exe" /flags:0x4 /state0:0xa3a15855 /state1:0x41c64e6d
1⤵
- Modifies data under HKEY_USERS
- Suspicious use of SetWindowsHookEx
PID:2536

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\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
45f53352160cf0903c729c35c8edfdce

SHA1
b35a4d4fbaf2a3cc61e540fc03516dd70f3c34ab

SHA256
9cf18d157a858fc143a6de5c2dd3f618516a527b34478ac478d8c94ff027b0d2

SHA512
e3fa27a80a1df58acb49106c306dab22e5ed582f6b0cd7d9c3ef0a85e9f5919333257e88aa44f42a0e095fd577c9e12a02957a7845c0d109f821f32d8d3343f3

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

Filesize
944B

MD5
e47c3fa11e796c492a8388c946bf1636

SHA1
4a090378f0db26c6f019c9203f5b27f12fa865c7

SHA256
4bb861850395dcc3bec4691e8b9f0fa733b8a2d568d460a9201d65250b12fee1

SHA512
8d4af4eba3019cd060561f42cff11374eafe59da5e5ad677e41d0b9198b87d6d13706e760d13c70574ed1384993a1597f886d21fe6ecd0186379a1e93db30695

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

Filesize
944B

MD5
e07eea85a8893f23fb814cf4b3ed974c

SHA1
8a8125b2890bbddbfc3531d0ee4393dbbf5936fe

SHA256
83387ce468d717a7b4ba238af2273da873b731a13cc35604f775a31fa0ac70ea

SHA512
9d4808d8a261005391388b85da79e4c5396bdded6e7e5ce3a3a23e7359d1aa1fb983b4324f97e0afec6e8ed9d898322ca258dd7cda654456dd7e84c9cbd509df

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_2nuobe5g.skl.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

Filesize
229KB

MD5
259101ea3a8a1c36a8ebe30f28deb851

SHA1
b5302bb4383bfa6e1f8a074182d1eecd79cd0caf

SHA256
91fd2cdc10b62a3aa10837c50c9dd2958f58a7c6feb6a5d29f73c5edca033999

SHA512
14c266cd69408d3cca1fa8dfeb0e9abedce87985b93bf6190b6436f74f122e06264c49c713d259eaa9f393180e3bef42462cb851686c2f32882cf03942e6dde3

Download Submit
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\RuntimeBroker.exe

Filesize
77KB

MD5
7c4f97717ce74232ede2fc0b48956636

SHA1
d7dd219805af9fb9251214d598badc3d4d1b7bf8

SHA256
f84e5ceb6d0c53993bf5139e7e58dcc06c8cc7d6bc1e5e97171445f6fe01109d

SHA512
ad1963a20fc98927239eb1aaa6f881913ac5884c28c00b59637e4fd51dbafd376150e1e6a5cf8634f6a5610bd2286dc185b3f14362c06a613dfe40db528cea26

Download Submit
memory/420-0-0x00007FFB3B213000-0x00007FFB3B215000-memory.dmp

Filesize
8KB

Download
memory/420-1-0x0000000000D60000-0x0000000000E84000-memory.dmp

Filesize
1.1MB

Download
memory/1200-37-0x000002054A6F0000-0x000002054A730000-memory.dmp

Filesize
256KB

Download
memory/2600-49-0x000001C7F7230000-0x000001C7F7252000-memory.dmp

Filesize
136KB

Download
memory/4300-43-0x0000000008640000-0x000000000864E000-memory.dmp

Filesize
56KB

Download
memory/4300-42-0x0000000008B60000-0x0000000008B98000-memory.dmp

Filesize
224KB

Download
memory/4300-39-0x00000000009B0000-0x0000000000A86000-memory.dmp

Filesize
856KB

Download
memory/4856-36-0x0000000000ED0000-0x0000000000EEA000-memory.dmp

Filesize
104KB

Download
memory/4856-38-0x00007FFB3B210000-0x00007FFB3BCD2000-memory.dmp

Filesize
10.8MB

Download
memory/4856-89-0x00007FFB3B210000-0x00007FFB3BCD2000-memory.dmp

Filesize
10.8MB

Download
memory/4856-93-0x00007FFB3B210000-0x00007FFB3BCD2000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

Errors

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads