umbral | 1d7a3691eb81388e6e74174c07e91dbf2625e97a9fb4230f5abc2f5b60a9b3bf

Analysis

max time kernel
148s
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
08-10-2024 16:51

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General

Target

RustAnticheat.exe
Size

1.1MB
MD5

b323c7d5108d8ebfc2f4dd43eaaef61f
SHA1

1b829cd04387683200ea435d93649603673aeaa9
SHA256

e4fb965deeb173b026d2014ff589944cc6e811b1363368329dc4c08b3ffad039
SHA512

efd6e4c80d5bc150ce33141eefd5608db601567e1cd5f9f4d03171df2ebc5b8d510c152b2e952168788366370417c0de11e42440bd3d0d37c8d0042b879603e5
SSDEEP

24576:+1F5e87F6Kijp49YwhM1Y2CA9vwKBu3NqMvzQYFoaNIfpAKEf:qF5eZKijp+G1Y7AxwKBeQMv00occu

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
behavioral2/files/0x000a000000023ba1-27.dat	family_umbral
behavioral2/memory/1244-36-0x000001F521080000-0x000001F5210C0000-memory.dmp	family_umbral

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/files/0x000b000000023b9c-16.dat	family_xworm
behavioral2/memory/2756-37-0x0000000000370000-0x0000000000388000-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
3556	powershell.exe
3272	powershell.exe
2884	powershell.exe
932	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-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	RustAnticheat.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\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 3 IoCs

pid	Process
4628	Loader (1).exe
2756	RuntimeBroker.exe
1244	Umbral.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-1-5-21-3442511616-637977696-3186306149-1000\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
4	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
3168	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
3132	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
932	powershell.exe
932	powershell.exe
3556	powershell.exe
3556	powershell.exe
3272	powershell.exe
3272	powershell.exe
2884	powershell.exe
2884	powershell.exe
2756	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 49 IoCs

description	pid	Process
Token: SeDebugPrivilege	2756	RuntimeBroker.exe
Token: SeDebugPrivilege	1244	Umbral.exe
Token: SeIncreaseQuotaPrivilege	2016	wmic.exe
Token: SeSecurityPrivilege	2016	wmic.exe
Token: SeTakeOwnershipPrivilege	2016	wmic.exe
Token: SeLoadDriverPrivilege	2016	wmic.exe
Token: SeSystemProfilePrivilege	2016	wmic.exe
Token: SeSystemtimePrivilege	2016	wmic.exe
Token: SeProfSingleProcessPrivilege	2016	wmic.exe
Token: SeIncBasePriorityPrivilege	2016	wmic.exe
Token: SeCreatePagefilePrivilege	2016	wmic.exe
Token: SeBackupPrivilege	2016	wmic.exe
Token: SeRestorePrivilege	2016	wmic.exe
Token: SeShutdownPrivilege	2016	wmic.exe
Token: SeDebugPrivilege	2016	wmic.exe
Token: SeSystemEnvironmentPrivilege	2016	wmic.exe
Token: SeRemoteShutdownPrivilege	2016	wmic.exe
Token: SeUndockPrivilege	2016	wmic.exe
Token: SeManageVolumePrivilege	2016	wmic.exe
Token: 33	2016	wmic.exe
Token: 34	2016	wmic.exe
Token: 35	2016	wmic.exe
Token: 36	2016	wmic.exe
Token: SeIncreaseQuotaPrivilege	2016	wmic.exe
Token: SeSecurityPrivilege	2016	wmic.exe
Token: SeTakeOwnershipPrivilege	2016	wmic.exe
Token: SeLoadDriverPrivilege	2016	wmic.exe
Token: SeSystemProfilePrivilege	2016	wmic.exe
Token: SeSystemtimePrivilege	2016	wmic.exe
Token: SeProfSingleProcessPrivilege	2016	wmic.exe
Token: SeIncBasePriorityPrivilege	2016	wmic.exe
Token: SeCreatePagefilePrivilege	2016	wmic.exe
Token: SeBackupPrivilege	2016	wmic.exe
Token: SeRestorePrivilege	2016	wmic.exe
Token: SeShutdownPrivilege	2016	wmic.exe
Token: SeDebugPrivilege	2016	wmic.exe
Token: SeSystemEnvironmentPrivilege	2016	wmic.exe
Token: SeRemoteShutdownPrivilege	2016	wmic.exe
Token: SeUndockPrivilege	2016	wmic.exe
Token: SeManageVolumePrivilege	2016	wmic.exe
Token: 33	2016	wmic.exe
Token: 34	2016	wmic.exe
Token: 35	2016	wmic.exe
Token: 36	2016	wmic.exe
Token: SeDebugPrivilege	932	powershell.exe
Token: SeDebugPrivilege	3556	powershell.exe
Token: SeDebugPrivilege	3272	powershell.exe
Token: SeDebugPrivilege	2884	powershell.exe
Token: SeDebugPrivilege	2756	RuntimeBroker.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2756	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 4612 wrote to memory of 4628	4612	RustAnticheat.exe	83
PID 4612 wrote to memory of 4628	4612	RustAnticheat.exe	83
PID 4612 wrote to memory of 4628	4612	RustAnticheat.exe	83
PID 4612 wrote to memory of 2756	4612	RustAnticheat.exe	85
PID 4612 wrote to memory of 2756	4612	RustAnticheat.exe	85
PID 4612 wrote to memory of 1244	4612	RustAnticheat.exe	86
PID 4612 wrote to memory of 1244	4612	RustAnticheat.exe	86
PID 1244 wrote to memory of 2016	1244	Umbral.exe	88
PID 1244 wrote to memory of 2016	1244	Umbral.exe	88
PID 2756 wrote to memory of 932	2756	RuntimeBroker.exe	93
PID 2756 wrote to memory of 932	2756	RuntimeBroker.exe	93
PID 2756 wrote to memory of 3556	2756	RuntimeBroker.exe	96
PID 2756 wrote to memory of 3556	2756	RuntimeBroker.exe	96
PID 2756 wrote to memory of 3272	2756	RuntimeBroker.exe	98
PID 2756 wrote to memory of 3272	2756	RuntimeBroker.exe	98
PID 2756 wrote to memory of 2884	2756	RuntimeBroker.exe	100
PID 2756 wrote to memory of 2884	2756	RuntimeBroker.exe	100
PID 2756 wrote to memory of 3132	2756	RuntimeBroker.exe	102
PID 2756 wrote to memory of 3132	2756	RuntimeBroker.exe	102
PID 2756 wrote to memory of 432	2756	RuntimeBroker.exe	106
PID 2756 wrote to memory of 432	2756	RuntimeBroker.exe	106
PID 2756 wrote to memory of 4368	2756	RuntimeBroker.exe	108
PID 2756 wrote to memory of 4368	2756	RuntimeBroker.exe	108
PID 4368 wrote to memory of 3168	4368	cmd.exe	110
PID 4368 wrote to memory of 3168	4368	cmd.exe	110

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:4612
- 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:4628
- 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:2756
- - 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:932
- - 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:3556
- - 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:3272
- - 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:2884
- - 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:3132
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /delete /f /tn "RuntimeBroker"
    3⤵
    PID:432
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp144E.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4368
  - - C:\Windows\system32\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:3168
- 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:1244
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:2016

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
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
19e1e2a79d89d1a806d9f998551c82a8

SHA1
3ea8c6b09bcaa874efc3a220f6f61eed4be85ebd

SHA256
210f353fbdf0ed0f95aec9d76a455c1e92f96000551a875c5de55cfa712f4adc

SHA512
da427ad972596f8f795ae978337e943cb07f9c5a2ed1c8d1f1cad27c07dcec2f4d4ffe9424db2b90fcba3c2f301524f52931a863efae38fca2bef1def53567b8

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

Filesize
944B

MD5
45e1394c6eaa9b9a14977f468836f746

SHA1
0af53cc503a063748aebdb63ef4d6ce623b0fb57

SHA256
8ce3b1fb465ae0d219cd7dd780aa255806a6bfdb6868e9677e36350b4f64cfbc

SHA512
6bdba53a07d7d9647d6410c2b97905e261db1c6b9387cdc7f15e0f7558a3ecdb2e0ca64cec533e0d32ac40e7b4566fb26708c2e963e581e378d05b243d2cca7e

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_gcohhsyq.wuz.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp144E.tmp.bat

Filesize
162B

MD5
8b236049d2e4fab70a47fc2699f19417

SHA1
f346bfa1d7f4a67f32bbfab916e248f3442c1155

SHA256
68c05ecbc16ab657968f99b026710e63caa6c02570a37ca8bb5346f349e93263

SHA512
59af980bc5457f0eef33c1de8d2ab52ecd9beb8e983a674c496bcfa1e11144e95b0a2f97a384e219627665829404da916b540ec93c16072f8fe4915a7892d5dc

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
73KB

MD5
96af510fc9c01219079834a9c95ddb55

SHA1
14f0c50ad5421350c8ca7f6eaeefd6ab5da38a09

SHA256
3718589c2b1ee0e11197034c51383245fd5cee736a4187bc7d4bbc22daeee598

SHA512
0c560efa6d436435bf1aaaa1c0a1d77d68655591368d8010267ca4b5a24e51204e4bdefce1f7adb6e93b6ecc9401c335e63f886dfd12cec93c759727df8d2da2

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

Filesize
232KB

MD5
f58d6804055161d2e9eddac2ef14ce3e

SHA1
1ad4327548a8362ceb37b8211291d4eac661f5ae

SHA256
c4131f8c0c24784d9fbecdadd623f112d76da2a8ff4bcd58f2acbb1325da47e5

SHA512
d872364d535fbf4e7f5573a46c96be633a8d23533091f77ae038d78da1b8af6755c61966a607294bf946dc7695973f70bfd43ed824849a7c5dac39d59a2a45c3

Download Submit
memory/932-48-0x000001B8E0A00000-0x000001B8E0A22000-memory.dmp

Filesize
136KB

Download
memory/1244-36-0x000001F521080000-0x000001F5210C0000-memory.dmp

Filesize
256KB

Download
memory/1244-42-0x000001F53B650000-0x000001F53B752000-memory.dmp

Filesize
1.0MB

Download
memory/1244-44-0x00007FFDFA730000-0x00007FFDFB1F1000-memory.dmp

Filesize
10.8MB

Download
memory/1244-40-0x00007FFDFA730000-0x00007FFDFB1F1000-memory.dmp

Filesize
10.8MB

Download
memory/2756-38-0x00007FFDFA730000-0x00007FFDFB1F1000-memory.dmp

Filesize
10.8MB

Download
memory/2756-37-0x0000000000370000-0x0000000000388000-memory.dmp

Filesize
96KB

Download
memory/2756-96-0x00007FFDFA730000-0x00007FFDFB1F1000-memory.dmp

Filesize
10.8MB

Download
memory/2756-97-0x000000001C3F0000-0x000000001C3FC000-memory.dmp

Filesize
48KB

Download
memory/2756-104-0x00007FFDFA730000-0x00007FFDFB1F1000-memory.dmp

Filesize
10.8MB

Download
memory/4612-0-0x00007FFDFA733000-0x00007FFDFA735000-memory.dmp

Filesize
8KB

Download
memory/4612-1-0x0000000000220000-0x0000000000344000-memory.dmp

Filesize
1.1MB

Download
memory/4628-39-0x00000000004F0000-0x00000000005C6000-memory.dmp

Filesize
856KB

Download
memory/4628-46-0x0000000008B10000-0x0000000008B1E000-memory.dmp

Filesize
56KB

Download
memory/4628-45-0x0000000008B30000-0x0000000008B68000-memory.dmp

Filesize
224KB

Download