umbral | b929ede4c76d1db2d2b1698d401d658fbce5e440fd54f4071701aae69ed791e9

Analysis

max time kernel
146s
max time network
150s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
03-10-2024 17:37

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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

Extracted

Family

umbral

https://discord.com/api/webhooks/1291451585494515744/LKDGh0k0NWFEqtktblmpi9FMNE2PK1J-08hBfSDWZ6hts8lC3NILBGDzrEYeKRQMidcr

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral1/files/0x0008000000016dbe-18.dat	family_umbral
behavioral1/memory/2172-19-0x0000000000B10000-0x0000000000B50000-memory.dmp	family_umbral

Detect Xworm Payload 4 IoCs

resource	yara_rule
behavioral1/files/0x0008000000016d9a-12.dat	family_xworm
behavioral1/memory/2796-15-0x0000000000960000-0x0000000000978000-memory.dmp	family_xworm
behavioral1/memory/644-58-0x00000000003E0000-0x00000000003F8000-memory.dmp	family_xworm
behavioral1/memory/2224-61-0x0000000000A50000-0x0000000000A68000-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
1500	powershell.exe
1164	powershell.exe
236	powershell.exe
1028	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 5 IoCs

pid	Process
2812	Loader (1).exe
2796	RuntimeBroker.exe
2172	Umbral.exe
644	RuntimeBroker
2224	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-1-5-21-1846800975-3917212583-2893086201-1000\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
6	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
2036	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
1500	powershell.exe
1164	powershell.exe
236	powershell.exe
1028	powershell.exe
2796	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 49 IoCs

description	pid	Process
Token: SeDebugPrivilege	2796	RuntimeBroker.exe
Token: SeDebugPrivilege	2172	Umbral.exe
Token: SeDebugPrivilege	1500	powershell.exe
Token: SeIncreaseQuotaPrivilege	1404	wmic.exe
Token: SeSecurityPrivilege	1404	wmic.exe
Token: SeTakeOwnershipPrivilege	1404	wmic.exe
Token: SeLoadDriverPrivilege	1404	wmic.exe
Token: SeSystemProfilePrivilege	1404	wmic.exe
Token: SeSystemtimePrivilege	1404	wmic.exe
Token: SeProfSingleProcessPrivilege	1404	wmic.exe
Token: SeIncBasePriorityPrivilege	1404	wmic.exe
Token: SeCreatePagefilePrivilege	1404	wmic.exe
Token: SeBackupPrivilege	1404	wmic.exe
Token: SeRestorePrivilege	1404	wmic.exe
Token: SeShutdownPrivilege	1404	wmic.exe
Token: SeDebugPrivilege	1404	wmic.exe
Token: SeSystemEnvironmentPrivilege	1404	wmic.exe
Token: SeRemoteShutdownPrivilege	1404	wmic.exe
Token: SeUndockPrivilege	1404	wmic.exe
Token: SeManageVolumePrivilege	1404	wmic.exe
Token: 33	1404	wmic.exe
Token: 34	1404	wmic.exe
Token: 35	1404	wmic.exe
Token: SeIncreaseQuotaPrivilege	1404	wmic.exe
Token: SeSecurityPrivilege	1404	wmic.exe
Token: SeTakeOwnershipPrivilege	1404	wmic.exe
Token: SeLoadDriverPrivilege	1404	wmic.exe
Token: SeSystemProfilePrivilege	1404	wmic.exe
Token: SeSystemtimePrivilege	1404	wmic.exe
Token: SeProfSingleProcessPrivilege	1404	wmic.exe
Token: SeIncBasePriorityPrivilege	1404	wmic.exe
Token: SeCreatePagefilePrivilege	1404	wmic.exe
Token: SeBackupPrivilege	1404	wmic.exe
Token: SeRestorePrivilege	1404	wmic.exe
Token: SeShutdownPrivilege	1404	wmic.exe
Token: SeDebugPrivilege	1404	wmic.exe
Token: SeSystemEnvironmentPrivilege	1404	wmic.exe
Token: SeRemoteShutdownPrivilege	1404	wmic.exe
Token: SeUndockPrivilege	1404	wmic.exe
Token: SeManageVolumePrivilege	1404	wmic.exe
Token: 33	1404	wmic.exe
Token: 34	1404	wmic.exe
Token: 35	1404	wmic.exe
Token: SeDebugPrivilege	1164	powershell.exe
Token: SeDebugPrivilege	236	powershell.exe
Token: SeDebugPrivilege	1028	powershell.exe
Token: SeDebugPrivilege	2796	RuntimeBroker.exe
Token: SeDebugPrivilege	644	RuntimeBroker
Token: SeDebugPrivilege	2224	RuntimeBroker

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2796	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 34 IoCs

description	pid	Process	procid_target
PID 2224 wrote to memory of 2812	2224	RustAnticheat.exe	31
PID 2224 wrote to memory of 2812	2224	RustAnticheat.exe	31
PID 2224 wrote to memory of 2812	2224	RustAnticheat.exe	31
PID 2224 wrote to memory of 2812	2224	RustAnticheat.exe	31
PID 2224 wrote to memory of 2796	2224	RustAnticheat.exe	32
PID 2224 wrote to memory of 2796	2224	RustAnticheat.exe	32
PID 2224 wrote to memory of 2796	2224	RustAnticheat.exe	32
PID 2224 wrote to memory of 2172	2224	RustAnticheat.exe	33
PID 2224 wrote to memory of 2172	2224	RustAnticheat.exe	33
PID 2224 wrote to memory of 2172	2224	RustAnticheat.exe	33
PID 2796 wrote to memory of 1500	2796	RuntimeBroker.exe	35
PID 2796 wrote to memory of 1500	2796	RuntimeBroker.exe	35
PID 2796 wrote to memory of 1500	2796	RuntimeBroker.exe	35
PID 2172 wrote to memory of 1404	2172	Umbral.exe	37
PID 2172 wrote to memory of 1404	2172	Umbral.exe	37
PID 2172 wrote to memory of 1404	2172	Umbral.exe	37
PID 2796 wrote to memory of 1164	2796	RuntimeBroker.exe	40
PID 2796 wrote to memory of 1164	2796	RuntimeBroker.exe	40
PID 2796 wrote to memory of 1164	2796	RuntimeBroker.exe	40
PID 2796 wrote to memory of 236	2796	RuntimeBroker.exe	42
PID 2796 wrote to memory of 236	2796	RuntimeBroker.exe	42
PID 2796 wrote to memory of 236	2796	RuntimeBroker.exe	42
PID 2796 wrote to memory of 1028	2796	RuntimeBroker.exe	44
PID 2796 wrote to memory of 1028	2796	RuntimeBroker.exe	44
PID 2796 wrote to memory of 1028	2796	RuntimeBroker.exe	44
PID 2796 wrote to memory of 2036	2796	RuntimeBroker.exe	46
PID 2796 wrote to memory of 2036	2796	RuntimeBroker.exe	46
PID 2796 wrote to memory of 2036	2796	RuntimeBroker.exe	46
PID 1772 wrote to memory of 644	1772	taskeng.exe	49
PID 1772 wrote to memory of 644	1772	taskeng.exe	49
PID 1772 wrote to memory of 644	1772	taskeng.exe	49
PID 1772 wrote to memory of 2224	1772	taskeng.exe	51
PID 1772 wrote to memory of 2224	1772	taskeng.exe	51
PID 1772 wrote to memory of 2224	1772	taskeng.exe	51

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:2224
- 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:2812
- 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:2796
- - 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:1500
- - 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:1164
- - 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:236
- - 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:1028
- - 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:2036
- 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:2172
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:1404

C:\Windows\system32\taskeng.exe
taskeng.exe {3EB29C32-5426-41AC-A116-B96E1B65AB00} S-1-5-21-1846800975-3917212583-2893086201-1000:ZQABOPWE\Admin:Interactive:[1]
1⤵
- Suspicious use of WriteProcessMemory
PID:1772
- C:\Users\Admin\RuntimeBroker
  C:\Users\Admin\RuntimeBroker
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:644
- C:\Users\Admin\RuntimeBroker
  C:\Users\Admin\RuntimeBroker
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:2224

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\Roaming\Loader (1).exe

Filesize
827KB

MD5
eefb801774c5ccb44153268a9357f5f1

SHA1
b1906b22e14edd142c52808ab3e5ba9346b85de5

SHA256
677aeb1981c58cba41a5d53ccbbf5b471e62dc49dc326570767da940560d840d

SHA512
1cf162fe6184d68dca514059d2de1123e80d0faac401765a54224aa5a987c9454bc92263fbec566835aa7b402f1f63ba59bb425ccc139e0a7391e66991f270b7

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\CD4XF7KM3L7W4BS3ADWY.temp

Filesize
7KB

MD5
9503c355029f041c40bd8e0c31de3985

SHA1
213903a9255a1320cd1ab799a5af40145e98a616

SHA256
1b33072828b63575100a39e1750854569bf5498fc03cdae38327508401da4aed

SHA512
aaa72142089e8e4cfc17b9e424c3b58e000734cc896a2364fd24011e552069efd295a4992b7a3d47606ef9885274327cf779736942a8e99034f77c9621c6e231

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/644-58-0x00000000003E0000-0x00000000003F8000-memory.dmp

Filesize
96KB

Download
memory/1164-36-0x000000001B540000-0x000000001B822000-memory.dmp

Filesize
2.9MB

Download
memory/1164-37-0x0000000002870000-0x0000000002878000-memory.dmp

Filesize
32KB

Download
memory/1500-29-0x000000001B610000-0x000000001B8F2000-memory.dmp

Filesize
2.9MB

Download
memory/1500-30-0x0000000001E20000-0x0000000001E28000-memory.dmp

Filesize
32KB

Download
memory/2172-19-0x0000000000B10000-0x0000000000B50000-memory.dmp

Filesize
256KB

Download
memory/2224-0-0x000007FEF5F03000-0x000007FEF5F04000-memory.dmp

Filesize
4KB

Download
memory/2224-61-0x0000000000A50000-0x0000000000A68000-memory.dmp

Filesize
96KB

Download
memory/2224-1-0x0000000001040000-0x0000000001164000-memory.dmp

Filesize
1.1MB

Download
memory/2796-15-0x0000000000960000-0x0000000000978000-memory.dmp

Filesize
96KB

Download
memory/2796-53-0x000007FEF5F00000-0x000007FEF68EC000-memory.dmp

Filesize
9.9MB

Download
memory/2796-21-0x000007FEF5F00000-0x000007FEF68EC000-memory.dmp

Filesize
9.9MB

Download
memory/2812-22-0x0000000000440000-0x000000000044A000-memory.dmp

Filesize
40KB

Download
memory/2812-23-0x0000000000440000-0x000000000044A000-memory.dmp

Filesize
40KB

Download
memory/2812-54-0x0000000000440000-0x000000000044A000-memory.dmp

Filesize
40KB

Download
memory/2812-20-0x00000000001E0000-0x00000000002B6000-memory.dmp

Filesize
856KB

Download