umbral | 91399415beee17d491d473ac161b7ea012308d1003e1977c6d20a97f45f92e8f

Analysis

max time kernel
146s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-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

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral2/files/0x000b000000023b58-17.dat	family_umbral
behavioral2/memory/3928-24-0x0000019ACC860000-0x0000019ACC8A0000-memory.dmp	family_umbral

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/files/0x000c000000023b4d-6.dat	family_xworm
behavioral2/memory/736-28-0x0000000000F20000-0x0000000000F3A000-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
3152	powershell.exe
1092	powershell.exe
3020	powershell.exe
1948	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-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	RustAnticheat.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\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 6 IoCs

pid	Process
736	RuntimeBroker.exe
3928	Umbral.exe
436	Loader (1).exe
2684	RuntimeBroker.exe
5040	RuntimeBroker.exe
3284	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-1-5-21-2878641211-696417878-3864914810-1000\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
8	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
1516	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
3152	powershell.exe
3152	powershell.exe
1092	powershell.exe
1092	powershell.exe
3020	powershell.exe
3020	powershell.exe
1948	powershell.exe
1948	powershell.exe
736	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 52 IoCs

description	pid	Process
Token: SeDebugPrivilege	736	RuntimeBroker.exe
Token: SeDebugPrivilege	3928	Umbral.exe
Token: SeIncreaseQuotaPrivilege	1672	wmic.exe
Token: SeSecurityPrivilege	1672	wmic.exe
Token: SeTakeOwnershipPrivilege	1672	wmic.exe
Token: SeLoadDriverPrivilege	1672	wmic.exe
Token: SeSystemProfilePrivilege	1672	wmic.exe
Token: SeSystemtimePrivilege	1672	wmic.exe
Token: SeProfSingleProcessPrivilege	1672	wmic.exe
Token: SeIncBasePriorityPrivilege	1672	wmic.exe
Token: SeCreatePagefilePrivilege	1672	wmic.exe
Token: SeBackupPrivilege	1672	wmic.exe
Token: SeRestorePrivilege	1672	wmic.exe
Token: SeShutdownPrivilege	1672	wmic.exe
Token: SeDebugPrivilege	1672	wmic.exe
Token: SeSystemEnvironmentPrivilege	1672	wmic.exe
Token: SeRemoteShutdownPrivilege	1672	wmic.exe
Token: SeUndockPrivilege	1672	wmic.exe
Token: SeManageVolumePrivilege	1672	wmic.exe
Token: 33	1672	wmic.exe
Token: 34	1672	wmic.exe
Token: 35	1672	wmic.exe
Token: 36	1672	wmic.exe
Token: SeIncreaseQuotaPrivilege	1672	wmic.exe
Token: SeSecurityPrivilege	1672	wmic.exe
Token: SeTakeOwnershipPrivilege	1672	wmic.exe
Token: SeLoadDriverPrivilege	1672	wmic.exe
Token: SeSystemProfilePrivilege	1672	wmic.exe
Token: SeSystemtimePrivilege	1672	wmic.exe
Token: SeProfSingleProcessPrivilege	1672	wmic.exe
Token: SeIncBasePriorityPrivilege	1672	wmic.exe
Token: SeCreatePagefilePrivilege	1672	wmic.exe
Token: SeBackupPrivilege	1672	wmic.exe
Token: SeRestorePrivilege	1672	wmic.exe
Token: SeShutdownPrivilege	1672	wmic.exe
Token: SeDebugPrivilege	1672	wmic.exe
Token: SeSystemEnvironmentPrivilege	1672	wmic.exe
Token: SeRemoteShutdownPrivilege	1672	wmic.exe
Token: SeUndockPrivilege	1672	wmic.exe
Token: SeManageVolumePrivilege	1672	wmic.exe
Token: 33	1672	wmic.exe
Token: 34	1672	wmic.exe
Token: 35	1672	wmic.exe
Token: 36	1672	wmic.exe
Token: SeDebugPrivilege	3152	powershell.exe
Token: SeDebugPrivilege	1092	powershell.exe
Token: SeDebugPrivilege	3020	powershell.exe
Token: SeDebugPrivilege	1948	powershell.exe
Token: SeDebugPrivilege	736	RuntimeBroker.exe
Token: SeDebugPrivilege	2684	RuntimeBroker.exe
Token: SeDebugPrivilege	5040	RuntimeBroker.exe
Token: SeDebugPrivilege	3284	RuntimeBroker.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
436	Loader (1).exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
736	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 1280 wrote to memory of 736	1280	RustAnticheat.exe	83
PID 1280 wrote to memory of 736	1280	RustAnticheat.exe	83
PID 1280 wrote to memory of 3928	1280	RustAnticheat.exe	84
PID 1280 wrote to memory of 3928	1280	RustAnticheat.exe	84
PID 1280 wrote to memory of 436	1280	RustAnticheat.exe	85
PID 1280 wrote to memory of 436	1280	RustAnticheat.exe	85
PID 1280 wrote to memory of 436	1280	RustAnticheat.exe	85
PID 3928 wrote to memory of 1672	3928	Umbral.exe	86
PID 3928 wrote to memory of 1672	3928	Umbral.exe	86
PID 736 wrote to memory of 3152	736	RuntimeBroker.exe	93
PID 736 wrote to memory of 3152	736	RuntimeBroker.exe	93
PID 736 wrote to memory of 1092	736	RuntimeBroker.exe	97
PID 736 wrote to memory of 1092	736	RuntimeBroker.exe	97
PID 736 wrote to memory of 3020	736	RuntimeBroker.exe	99
PID 736 wrote to memory of 3020	736	RuntimeBroker.exe	99
PID 736 wrote to memory of 1948	736	RuntimeBroker.exe	101
PID 736 wrote to memory of 1948	736	RuntimeBroker.exe	101
PID 736 wrote to memory of 1516	736	RuntimeBroker.exe	106
PID 736 wrote to memory of 1516	736	RuntimeBroker.exe	106

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:1280
- 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:736
- - 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:3152
- - 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:1092
- - 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:3020
- - 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:1948
- - 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:1516
- 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:3928
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:1672
- 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
  - Suspicious use of FindShellTrayWindow
  PID:436

C:\Users\Admin\RuntimeBroker.exe
C:\Users\Admin\RuntimeBroker.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2684

C:\Users\Admin\RuntimeBroker.exe
C:\Users\Admin\RuntimeBroker.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:5040

C:\Users\Admin\RuntimeBroker.exe
C:\Users\Admin\RuntimeBroker.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3284

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.exe.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
6d42b6da621e8df5674e26b799c8e2aa

SHA1
ab3ce1327ea1eeedb987ec823d5e0cb146bafa48

SHA256
5ab6a1726f425c6d0158f55eb8d81754ddedd51e651aa0a899a29b7a58619c4c

SHA512
53faffbda8a835bc1143e894c118c15901a5fd09cfc2224dd2f754c06dc794897315049a579b9a8382d4564f071576045aaaf824019b7139d939152dca38ce29

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

Filesize
944B

MD5
da5c82b0e070047f7377042d08093ff4

SHA1
89d05987cd60828cca516c5c40c18935c35e8bd3

SHA256
77a94ef8c4258445d538a6006ffadb05afdf888f6f044e1e5466b981a07f16c5

SHA512
7360311a3c97b73dd3f6d7179cd979e0e20d69f380d38292447e17e369087d9dd5acb66cd0cbdd95ac4bfb16e5a1b86825f835a8d45b14ea9812102cff59704b

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

Filesize
944B

MD5
47605a4dda32c9dff09a9ca441417339

SHA1
4f68c895c35b0dc36257fc8251e70b968c560b62

SHA256
e6254c2bc9846a76a4567ab91b6eae76e937307ff9301b65d577ffe6e15fe40a

SHA512
b6823b6e794a2fe3e4c4ecfb3f0d61a54821de7feb4f9e3e7fd463e7fbb5e6848f59865b487dafebeac431e4f4db81ef56836d94cac67da39852c566ed34a885

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_dx5j3bsm.lu3.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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
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/436-44-0x0000000008FB0000-0x0000000008FE8000-memory.dmp

Filesize
224KB

Download
memory/436-40-0x0000000000830000-0x0000000000906000-memory.dmp

Filesize
856KB

Download
memory/436-45-0x0000000008F80000-0x0000000008F8E000-memory.dmp

Filesize
56KB

Download
memory/736-28-0x0000000000F20000-0x0000000000F3A000-memory.dmp

Filesize
104KB

Download
memory/736-38-0x00007FF9DE4F0000-0x00007FF9DEFB1000-memory.dmp

Filesize
10.8MB

Download
memory/736-96-0x00007FF9DE4F0000-0x00007FF9DEFB1000-memory.dmp

Filesize
10.8MB

Download
memory/1280-0-0x00007FF9DE4F3000-0x00007FF9DE4F5000-memory.dmp

Filesize
8KB

Download
memory/1280-1-0x0000000000970000-0x0000000000A94000-memory.dmp

Filesize
1.1MB

Download
memory/3152-55-0x000002D9B84D0000-0x000002D9B84F2000-memory.dmp

Filesize
136KB

Download
memory/3928-39-0x00007FF9DE4F0000-0x00007FF9DEFB1000-memory.dmp

Filesize
10.8MB

Download
memory/3928-43-0x00007FF9DE4F0000-0x00007FF9DEFB1000-memory.dmp

Filesize
10.8MB

Download
memory/3928-24-0x0000019ACC860000-0x0000019ACC8A0000-memory.dmp

Filesize
256KB

Download