umbral | 20868115f180702553380c551df502535b8aa01c3ef630d408edd849896e631a

Analysis

max time kernel
126s
max time network
154s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
25-09-2024 07:25

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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

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/memory/1536-36-0x0000026885A40000-0x0000026885A80000-memory.dmp	family_umbral
behavioral4/files/0x000700000002346f-28.dat	family_umbral

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral4/files/0x000700000002346e-16.dat	family_xworm
behavioral4/memory/4752-37-0x00000000001C0000-0x00000000001DA000-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
2120	powershell.exe
3264	powershell.exe
2000	powershell.exe
4264	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-1-5-21-1194130065-3471212556-1656947724-1000\Control Panel\International\Geo\Nation	RustAnticheat.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\Control Panel\International\Geo\Nation	RuntimeBroker.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
1840	Loader (1).exe
4752	RuntimeBroker.exe
1536	Litvin.exe
2492	RuntimeBroker
1512	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-1-5-21-1194130065-3471212556-1656947724-1000\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
11	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

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4104	timeout.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
2600	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
2000	powershell.exe
2000	powershell.exe
4264	powershell.exe
4264	powershell.exe
2120	powershell.exe
2120	powershell.exe
3264	powershell.exe
3264	powershell.exe
4752	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 51 IoCs

description	pid	Process
Token: SeDebugPrivilege	4752	RuntimeBroker.exe
Token: SeDebugPrivilege	1536	Litvin.exe
Token: SeIncreaseQuotaPrivilege	560	wmic.exe
Token: SeSecurityPrivilege	560	wmic.exe
Token: SeTakeOwnershipPrivilege	560	wmic.exe
Token: SeLoadDriverPrivilege	560	wmic.exe
Token: SeSystemProfilePrivilege	560	wmic.exe
Token: SeSystemtimePrivilege	560	wmic.exe
Token: SeProfSingleProcessPrivilege	560	wmic.exe
Token: SeIncBasePriorityPrivilege	560	wmic.exe
Token: SeCreatePagefilePrivilege	560	wmic.exe
Token: SeBackupPrivilege	560	wmic.exe
Token: SeRestorePrivilege	560	wmic.exe
Token: SeShutdownPrivilege	560	wmic.exe
Token: SeDebugPrivilege	560	wmic.exe
Token: SeSystemEnvironmentPrivilege	560	wmic.exe
Token: SeRemoteShutdownPrivilege	560	wmic.exe
Token: SeUndockPrivilege	560	wmic.exe
Token: SeManageVolumePrivilege	560	wmic.exe
Token: 33	560	wmic.exe
Token: 34	560	wmic.exe
Token: 35	560	wmic.exe
Token: 36	560	wmic.exe
Token: SeIncreaseQuotaPrivilege	560	wmic.exe
Token: SeSecurityPrivilege	560	wmic.exe
Token: SeTakeOwnershipPrivilege	560	wmic.exe
Token: SeLoadDriverPrivilege	560	wmic.exe
Token: SeSystemProfilePrivilege	560	wmic.exe
Token: SeSystemtimePrivilege	560	wmic.exe
Token: SeProfSingleProcessPrivilege	560	wmic.exe
Token: SeIncBasePriorityPrivilege	560	wmic.exe
Token: SeCreatePagefilePrivilege	560	wmic.exe
Token: SeBackupPrivilege	560	wmic.exe
Token: SeRestorePrivilege	560	wmic.exe
Token: SeShutdownPrivilege	560	wmic.exe
Token: SeDebugPrivilege	560	wmic.exe
Token: SeSystemEnvironmentPrivilege	560	wmic.exe
Token: SeRemoteShutdownPrivilege	560	wmic.exe
Token: SeUndockPrivilege	560	wmic.exe
Token: SeManageVolumePrivilege	560	wmic.exe
Token: 33	560	wmic.exe
Token: 34	560	wmic.exe
Token: 35	560	wmic.exe
Token: 36	560	wmic.exe
Token: SeDebugPrivilege	2000	powershell.exe
Token: SeDebugPrivilege	4264	powershell.exe
Token: SeDebugPrivilege	2120	powershell.exe
Token: SeDebugPrivilege	3264	powershell.exe
Token: SeDebugPrivilege	4752	RuntimeBroker.exe
Token: SeDebugPrivilege	2492	RuntimeBroker
Token: SeDebugPrivilege	1512	RuntimeBroker

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4752	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 544 wrote to memory of 1840	544	RustAnticheat.exe	82
PID 544 wrote to memory of 1840	544	RustAnticheat.exe	82
PID 544 wrote to memory of 1840	544	RustAnticheat.exe	82
PID 544 wrote to memory of 4752	544	RustAnticheat.exe	83
PID 544 wrote to memory of 4752	544	RustAnticheat.exe	83
PID 544 wrote to memory of 1536	544	RustAnticheat.exe	84
PID 544 wrote to memory of 1536	544	RustAnticheat.exe	84
PID 1536 wrote to memory of 560	1536	Litvin.exe	85
PID 1536 wrote to memory of 560	1536	Litvin.exe	85
PID 4752 wrote to memory of 2000	4752	RuntimeBroker.exe	89
PID 4752 wrote to memory of 2000	4752	RuntimeBroker.exe	89
PID 4752 wrote to memory of 4264	4752	RuntimeBroker.exe	91
PID 4752 wrote to memory of 4264	4752	RuntimeBroker.exe	91
PID 4752 wrote to memory of 2120	4752	RuntimeBroker.exe	93
PID 4752 wrote to memory of 2120	4752	RuntimeBroker.exe	93
PID 4752 wrote to memory of 3264	4752	RuntimeBroker.exe	95
PID 4752 wrote to memory of 3264	4752	RuntimeBroker.exe	95
PID 4752 wrote to memory of 2600	4752	RuntimeBroker.exe	97
PID 4752 wrote to memory of 2600	4752	RuntimeBroker.exe	97
PID 4752 wrote to memory of 2156	4752	RuntimeBroker.exe	109
PID 4752 wrote to memory of 2156	4752	RuntimeBroker.exe	109
PID 4752 wrote to memory of 5100	4752	RuntimeBroker.exe	111
PID 4752 wrote to memory of 5100	4752	RuntimeBroker.exe	111
PID 5100 wrote to memory of 4104	5100	cmd.exe	113
PID 5100 wrote to memory of 4104	5100	cmd.exe	113

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⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:544
- 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:1840
- C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe
  "C:\Users\Admin\AppData\Roaming\RuntimeBroker.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:4752
- - 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:2000
- - 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:4264
- - 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:2120
- - 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:3264
- - 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:2600
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /delete /f /tn "RuntimeBroker"
    3⤵
    PID:2156
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp6D56.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:5100
  - - C:\Windows\system32\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:4104
- 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:1536
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:560

C:\Users\Admin\RuntimeBroker
C:\Users\Admin\RuntimeBroker
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2492

C:\Users\Admin\RuntimeBroker
C:\Users\Admin\RuntimeBroker
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1512

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\RuntimeBroker.log

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

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

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

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

Filesize
944B

MD5
cadef9abd087803c630df65264a6c81c

SHA1
babbf3636c347c8727c35f3eef2ee643dbcc4bd2

SHA256
cce65b73cdfe9304bcd5207913e8b60fb69faa20cd3b684f2b0343b755b99438

SHA512
7278aa87124abb382d9024a645e881e7b7cf1b84e8894943b36e018dbf0399e6858392f77980b599fa5488e2e21bf757a0702fe6419417edac93b68e0c2ec085

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

Filesize
944B

MD5
d8cb3e9459807e35f02130fad3f9860d

SHA1
5af7f32cb8a30e850892b15e9164030a041f4bd6

SHA256
2b139c74072ccbdaa17b950f32a6dbc934dfb7af9973d97c9b0d9c498012ba68

SHA512
045239ba31367fbdd59e883f74eafc05724e23bd6e8f0c1e7171ea2496a497eb9e0cfcb57285bb81c4d569daadba43d6ef64c626ca48f1e2a59e8d97f0cc9184

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

Filesize
944B

MD5
eb033be02578f9635ec47bdc1de5c3fb

SHA1
ec356bc87381354a06baa9c30e8c3ac3d30e0f6f

SHA256
bd827af3192bf83c75a32e51ed2de83bd3b90d6b99350721a189a57cec15d063

SHA512
4d8778503646f7016df73ff9d204760f4fe4d2b24157920ac3e5651653373975b2f2d229530143059f11b16c42822ad7963e628ad6066022ee712c17d90595ed

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_cd4maqpg.dyh.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp6D56.tmp.bat

Filesize
162B

MD5
8a3bafba94e7bc5f0aa7e9bef372f9f7

SHA1
9b3f9e979d9c5340e5f48fcfc019301a0e8fa1d1

SHA256
cac7c71a335a86f4cb8046d6a18fd6908fad448e2e7fa2055bbb6f9eed3e7de3

SHA512
f7dcc8d848eb239fa1e8b93f9728b890c2907c5585ab806593a5d93a78af6ef122bc7bf900bd811d9956ffe16fb7089bb9fe360e8a4f656c011fabc164036f5f

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/544-0-0x00007FFB44253000-0x00007FFB44255000-memory.dmp

Filesize
8KB

Download
memory/544-1-0x0000000000C40000-0x0000000000D64000-memory.dmp

Filesize
1.1MB

Download
memory/1536-40-0x00007FFB44250000-0x00007FFB44D11000-memory.dmp

Filesize
10.8MB

Download
memory/1536-43-0x00007FFB44250000-0x00007FFB44D11000-memory.dmp

Filesize
10.8MB

Download
memory/1536-36-0x0000026885A40000-0x0000026885A80000-memory.dmp

Filesize
256KB

Download
memory/1840-45-0x0000000008680000-0x000000000868E000-memory.dmp

Filesize
56KB

Download
memory/1840-44-0x00000000086B0000-0x00000000086E8000-memory.dmp

Filesize
224KB

Download
memory/1840-39-0x0000000000060000-0x0000000000136000-memory.dmp

Filesize
856KB

Download
memory/2000-51-0x00000195363E0000-0x0000019536402000-memory.dmp

Filesize
136KB

Download
memory/4752-38-0x00007FFB44250000-0x00007FFB44D11000-memory.dmp

Filesize
10.8MB

Download
memory/4752-37-0x00000000001C0000-0x00000000001DA000-memory.dmp

Filesize
104KB

Download
memory/4752-95-0x00007FFB44250000-0x00007FFB44D11000-memory.dmp

Filesize
10.8MB

Download
memory/4752-107-0x00007FFB44250000-0x00007FFB44D11000-memory.dmp

Filesize
10.8MB

Download