umbral | b929ede4c76d1db2d2b1698d401d658fbce5e440fd54f4071701aae69ed791e9

Analysis

max time kernel
147s
max time network
143s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
03-10-2024 17:33

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General

Target

RustAnticheat.exe
Size

1.1MB
MD5

84e9631aef9d0342cae8466ed841ca7f
SHA1

fed84e7f25bb9f337a99e820111e87be1de954aa
SHA256

b929ede4c76d1db2d2b1698d401d658fbce5e440fd54f4071701aae69ed791e9
SHA512

9fd3bf2966edb0ae54a9a46ded59fde75e6c7653078a5cac3563333a0f3ee1c197cfd622c2828855aacbc2023ff85f3d37a01dcb360a0b611aa1a43d59cdd36b
SSDEEP

24576:y1zV1C+mn91Bm1uyv43wswHTFZp/qg0GsO0iT7puGB:uh0I0yIYzFZ90Gstw

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
behavioral3/files/0x00070000000234ce-28.dat	family_umbral
behavioral3/memory/4224-37-0x000001A96DDB0000-0x000001A96DDF0000-memory.dmp	family_umbral

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral3/files/0x00070000000234cd-23.dat	family_xworm
behavioral3/memory/2852-35-0x00000000002C0000-0x00000000002D8000-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
4720	powershell.exe
4340	powershell.exe
1020	powershell.exe
3552	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-1-5-21-1302416131-1437503476-2806442725-1000\Control Panel\International\Geo\Nation	RustAnticheat.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1302416131-1437503476-2806442725-1000\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
4360	Loader (1).exe
2852	RuntimeBroker.exe
4224	Umbral.exe
664	RuntimeBroker
2472	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-1-5-21-1302416131-1437503476-2806442725-1000\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
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
3708	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
3552	powershell.exe
3552	powershell.exe
4720	powershell.exe
4720	powershell.exe
4340	powershell.exe
4340	powershell.exe
1020	powershell.exe
1020	powershell.exe
2852	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 51 IoCs

description	pid	Process
Token: SeDebugPrivilege	2852	RuntimeBroker.exe
Token: SeDebugPrivilege	4224	Umbral.exe
Token: SeIncreaseQuotaPrivilege	312	wmic.exe
Token: SeSecurityPrivilege	312	wmic.exe
Token: SeTakeOwnershipPrivilege	312	wmic.exe
Token: SeLoadDriverPrivilege	312	wmic.exe
Token: SeSystemProfilePrivilege	312	wmic.exe
Token: SeSystemtimePrivilege	312	wmic.exe
Token: SeProfSingleProcessPrivilege	312	wmic.exe
Token: SeIncBasePriorityPrivilege	312	wmic.exe
Token: SeCreatePagefilePrivilege	312	wmic.exe
Token: SeBackupPrivilege	312	wmic.exe
Token: SeRestorePrivilege	312	wmic.exe
Token: SeShutdownPrivilege	312	wmic.exe
Token: SeDebugPrivilege	312	wmic.exe
Token: SeSystemEnvironmentPrivilege	312	wmic.exe
Token: SeRemoteShutdownPrivilege	312	wmic.exe
Token: SeUndockPrivilege	312	wmic.exe
Token: SeManageVolumePrivilege	312	wmic.exe
Token: 33	312	wmic.exe
Token: 34	312	wmic.exe
Token: 35	312	wmic.exe
Token: 36	312	wmic.exe
Token: SeIncreaseQuotaPrivilege	312	wmic.exe
Token: SeSecurityPrivilege	312	wmic.exe
Token: SeTakeOwnershipPrivilege	312	wmic.exe
Token: SeLoadDriverPrivilege	312	wmic.exe
Token: SeSystemProfilePrivilege	312	wmic.exe
Token: SeSystemtimePrivilege	312	wmic.exe
Token: SeProfSingleProcessPrivilege	312	wmic.exe
Token: SeIncBasePriorityPrivilege	312	wmic.exe
Token: SeCreatePagefilePrivilege	312	wmic.exe
Token: SeBackupPrivilege	312	wmic.exe
Token: SeRestorePrivilege	312	wmic.exe
Token: SeShutdownPrivilege	312	wmic.exe
Token: SeDebugPrivilege	312	wmic.exe
Token: SeSystemEnvironmentPrivilege	312	wmic.exe
Token: SeRemoteShutdownPrivilege	312	wmic.exe
Token: SeUndockPrivilege	312	wmic.exe
Token: SeManageVolumePrivilege	312	wmic.exe
Token: 33	312	wmic.exe
Token: 34	312	wmic.exe
Token: 35	312	wmic.exe
Token: 36	312	wmic.exe
Token: SeDebugPrivilege	3552	powershell.exe
Token: SeDebugPrivilege	4720	powershell.exe
Token: SeDebugPrivilege	4340	powershell.exe
Token: SeDebugPrivilege	1020	powershell.exe
Token: SeDebugPrivilege	2852	RuntimeBroker.exe
Token: SeDebugPrivilege	664	RuntimeBroker
Token: SeDebugPrivilege	2472	RuntimeBroker

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2852	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 2424 wrote to memory of 4360	2424	RustAnticheat.exe	82
PID 2424 wrote to memory of 4360	2424	RustAnticheat.exe	82
PID 2424 wrote to memory of 4360	2424	RustAnticheat.exe	82
PID 2424 wrote to memory of 2852	2424	RustAnticheat.exe	83
PID 2424 wrote to memory of 2852	2424	RustAnticheat.exe	83
PID 2424 wrote to memory of 4224	2424	RustAnticheat.exe	84
PID 2424 wrote to memory of 4224	2424	RustAnticheat.exe	84
PID 4224 wrote to memory of 312	4224	Umbral.exe	85
PID 4224 wrote to memory of 312	4224	Umbral.exe	85
PID 2852 wrote to memory of 3552	2852	RuntimeBroker.exe	89
PID 2852 wrote to memory of 3552	2852	RuntimeBroker.exe	89
PID 2852 wrote to memory of 4720	2852	RuntimeBroker.exe	91
PID 2852 wrote to memory of 4720	2852	RuntimeBroker.exe	91
PID 2852 wrote to memory of 4340	2852	RuntimeBroker.exe	93
PID 2852 wrote to memory of 4340	2852	RuntimeBroker.exe	93
PID 2852 wrote to memory of 1020	2852	RuntimeBroker.exe	95
PID 2852 wrote to memory of 1020	2852	RuntimeBroker.exe	95
PID 2852 wrote to memory of 3708	2852	RuntimeBroker.exe	97
PID 2852 wrote to memory of 3708	2852	RuntimeBroker.exe	97

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:2424
- 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:4360
- 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:2852
- - 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:3552
- - 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:4720
- - 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:4340
- - 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:1020
- - 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:3708
- 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:4224
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:312

C:\Users\Admin\RuntimeBroker
C:\Users\Admin\RuntimeBroker
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:664

C:\Users\Admin\RuntimeBroker
C:\Users\Admin\RuntimeBroker
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2472

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
77d622bb1a5b250869a3238b9bc1402b

SHA1
d47f4003c2554b9dfc4c16f22460b331886b191b

SHA256
f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb

SHA512
d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

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
9bc110200117a3752313ca2acaf8a9e1

SHA1
fda6b7da2e7b0175b391475ca78d1b4cf2147cd3

SHA256
c88e4bbb64f7fa31429ebe82c1cf07785c44486f37576f783a26ac856e02a4eb

SHA512
1f1af32aa18a8cbfcc65b0d4fb7e6ca2705f125eaa85789e981ee68b90c64522e954825abf460d4b4f97567715dfae8d9b0a25a4d54d10bc4c257c472f2e80fb

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_eppmgxsc.nuc.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
73KB

MD5
96af510fc9c01219079834a9c95ddb55

SHA1
14f0c50ad5421350c8ca7f6eaeefd6ab5da38a09

SHA256
3718589c2b1ee0e11197034c51383245fd5cee736a4187bc7d4bbc22daeee598

SHA512
0c560efa6d436435bf1aaaa1c0a1d77d68655591368d8010267ca4b5a24e51204e4bdefce1f7adb6e93b6ecc9401c335e63f886dfd12cec93c759727df8d2da2

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

Filesize
229KB

MD5
471fb39fc8ef1c26c8b6b332531d79c5

SHA1
fba16c9c0de9ea00cebf4f90ab7095fd0e892ef3

SHA256
c672509e54b49ee79d9a61f2e9deb18311427267799fb65523e71cf76e814830

SHA512
a2cd9fc672ef6fc904a7f0a3b8affff554c5035363b074df48838a9a5c3e48e880cc97fc0e8cf4bfa68d430fd6b01c273fa7fef07d0f70403a15f47c7169f015

Download Submit
memory/2424-0-0x00007FFD8B303000-0x00007FFD8B305000-memory.dmp

Filesize
8KB

Download
memory/2424-1-0x00000000000A0000-0x00000000001C4000-memory.dmp

Filesize
1.1MB

Download
memory/2852-38-0x00007FFD8B300000-0x00007FFD8BDC1000-memory.dmp

Filesize
10.8MB

Download
memory/2852-35-0x00000000002C0000-0x00000000002D8000-memory.dmp

Filesize
96KB

Download
memory/2852-93-0x00007FFD8B300000-0x00007FFD8BDC1000-memory.dmp

Filesize
10.8MB

Download
memory/3552-44-0x000002066FAD0000-0x000002066FAF2000-memory.dmp

Filesize
136KB

Download
memory/4224-37-0x000001A96DDB0000-0x000001A96DDF0000-memory.dmp

Filesize
256KB

Download
memory/4360-42-0x0000000008E90000-0x0000000008EC8000-memory.dmp

Filesize
224KB

Download
memory/4360-43-0x0000000008E60000-0x0000000008E6E000-memory.dmp

Filesize
56KB

Download
memory/4360-39-0x0000000000850000-0x0000000000926000-memory.dmp

Filesize
856KB

Download