umbral | 5bf57a09e808187117a444d16d5145fe8cd5064aaecb383d16a1b0336fe618c4

Analysis

max time kernel
95s
max time network
97s
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, 07:08

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General

Target

RustAnticheat.exe
Size

1.1MB
MD5

f6f5e5a1dd30fb5fa22f220ecbe1b05a
SHA1

c04279611affa2129b36332b2f748b842cd0e7a7
SHA256

5bf57a09e808187117a444d16d5145fe8cd5064aaecb383d16a1b0336fe618c4
SHA512

730d5719d50148ae79a28d70f2cd102ba260560cdb141aad7d31066453f9ad6cfe8a36a46da9d162a122dec5a5d1685879a4f5b0adef48677daa7168717cb1ff
SSDEEP

24576:32oxfnX+1FmWYQw00hlKAv65/9KlH8XbF1A/t30TuG/m+V54/6AH1Ba:3L5nXumWYCTsCKlcXbU/tjGg/6AV

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/0x000700000002342f-61.dat	family_umbral
behavioral2/memory/1684-89-0x00000201B64C0000-0x00000201B6500000-memory.dmp	family_umbral

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/files/0x000700000002342e-34.dat	family_xworm
behavioral2/memory/3316-91-0x0000000000210000-0x000000000022C000-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
768	powershell.exe
2748	powershell.exe
3992	powershell.exe
2212	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-1-5-21-786284298-625481688-3210388970-1000\Control Panel\International\Geo\Nation	RustAnticheat.exe
Key value queried	\REGISTRY\USER\S-1-5-21-786284298-625481688-3210388970-1000\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 4 IoCs

pid	Process
5064	Loader (1).exe
3316	RuntimeBroker.exe
1684	Umbral1.exe
5028	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-1-5-21-786284298-625481688-3210388970-1000\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

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3356	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
404	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
3992	powershell.exe
3992	powershell.exe
2212	powershell.exe
2212	powershell.exe
768	powershell.exe
768	powershell.exe
2748	powershell.exe
2748	powershell.exe
3316	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 50 IoCs

description	pid	Process
Token: SeDebugPrivilege	3316	RuntimeBroker.exe
Token: SeDebugPrivilege	1684	Umbral1.exe
Token: SeIncreaseQuotaPrivilege	2340	wmic.exe
Token: SeSecurityPrivilege	2340	wmic.exe
Token: SeTakeOwnershipPrivilege	2340	wmic.exe
Token: SeLoadDriverPrivilege	2340	wmic.exe
Token: SeSystemProfilePrivilege	2340	wmic.exe
Token: SeSystemtimePrivilege	2340	wmic.exe
Token: SeProfSingleProcessPrivilege	2340	wmic.exe
Token: SeIncBasePriorityPrivilege	2340	wmic.exe
Token: SeCreatePagefilePrivilege	2340	wmic.exe
Token: SeBackupPrivilege	2340	wmic.exe
Token: SeRestorePrivilege	2340	wmic.exe
Token: SeShutdownPrivilege	2340	wmic.exe
Token: SeDebugPrivilege	2340	wmic.exe
Token: SeSystemEnvironmentPrivilege	2340	wmic.exe
Token: SeRemoteShutdownPrivilege	2340	wmic.exe
Token: SeUndockPrivilege	2340	wmic.exe
Token: SeManageVolumePrivilege	2340	wmic.exe
Token: 33	2340	wmic.exe
Token: 34	2340	wmic.exe
Token: 35	2340	wmic.exe
Token: 36	2340	wmic.exe
Token: SeIncreaseQuotaPrivilege	2340	wmic.exe
Token: SeSecurityPrivilege	2340	wmic.exe
Token: SeTakeOwnershipPrivilege	2340	wmic.exe
Token: SeLoadDriverPrivilege	2340	wmic.exe
Token: SeSystemProfilePrivilege	2340	wmic.exe
Token: SeSystemtimePrivilege	2340	wmic.exe
Token: SeProfSingleProcessPrivilege	2340	wmic.exe
Token: SeIncBasePriorityPrivilege	2340	wmic.exe
Token: SeCreatePagefilePrivilege	2340	wmic.exe
Token: SeBackupPrivilege	2340	wmic.exe
Token: SeRestorePrivilege	2340	wmic.exe
Token: SeShutdownPrivilege	2340	wmic.exe
Token: SeDebugPrivilege	2340	wmic.exe
Token: SeSystemEnvironmentPrivilege	2340	wmic.exe
Token: SeRemoteShutdownPrivilege	2340	wmic.exe
Token: SeUndockPrivilege	2340	wmic.exe
Token: SeManageVolumePrivilege	2340	wmic.exe
Token: 33	2340	wmic.exe
Token: 34	2340	wmic.exe
Token: 35	2340	wmic.exe
Token: 36	2340	wmic.exe
Token: SeDebugPrivilege	3992	powershell.exe
Token: SeDebugPrivilege	2212	powershell.exe
Token: SeDebugPrivilege	768	powershell.exe
Token: SeDebugPrivilege	2748	powershell.exe
Token: SeDebugPrivilege	3316	RuntimeBroker.exe
Token: SeDebugPrivilege	5028	RuntimeBroker

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3316	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 3424 wrote to memory of 5064	3424	RustAnticheat.exe	82
PID 3424 wrote to memory of 5064	3424	RustAnticheat.exe	82
PID 3424 wrote to memory of 5064	3424	RustAnticheat.exe	82
PID 3424 wrote to memory of 3316	3424	RustAnticheat.exe	83
PID 3424 wrote to memory of 3316	3424	RustAnticheat.exe	83
PID 3424 wrote to memory of 1684	3424	RustAnticheat.exe	84
PID 3424 wrote to memory of 1684	3424	RustAnticheat.exe	84
PID 1684 wrote to memory of 2340	1684	Umbral1.exe	85
PID 1684 wrote to memory of 2340	1684	Umbral1.exe	85
PID 3316 wrote to memory of 3992	3316	RuntimeBroker.exe	90
PID 3316 wrote to memory of 3992	3316	RuntimeBroker.exe	90
PID 3316 wrote to memory of 2212	3316	RuntimeBroker.exe	92
PID 3316 wrote to memory of 2212	3316	RuntimeBroker.exe	92
PID 3316 wrote to memory of 768	3316	RuntimeBroker.exe	94
PID 3316 wrote to memory of 768	3316	RuntimeBroker.exe	94
PID 3316 wrote to memory of 2748	3316	RuntimeBroker.exe	96
PID 3316 wrote to memory of 2748	3316	RuntimeBroker.exe	96
PID 3316 wrote to memory of 404	3316	RuntimeBroker.exe	98
PID 3316 wrote to memory of 404	3316	RuntimeBroker.exe	98
PID 3316 wrote to memory of 4144	3316	RuntimeBroker.exe	109
PID 3316 wrote to memory of 4144	3316	RuntimeBroker.exe	109
PID 3316 wrote to memory of 1016	3316	RuntimeBroker.exe	111
PID 3316 wrote to memory of 1016	3316	RuntimeBroker.exe	111
PID 1016 wrote to memory of 3356	1016	cmd.exe	113
PID 1016 wrote to memory of 3356	1016	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:3424
- C:\Users\Admin\Loader (1).exe
  "C:\Users\Admin\Loader (1).exe"
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  PID:5064
- C:\Users\Admin\RuntimeBroker.exe
  "C:\Users\Admin\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:3316
- - 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:3992
- - 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:2212
- - 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:768
- - 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:2748
- - 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:404
- - C:\Windows\System32\schtasks.exe
    "C:\Windows\System32\schtasks.exe" /delete /f /tn "RuntimeBroker"
    3⤵
    PID:4144
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpD9E0.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1016
  - - C:\Windows\system32\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:3356
- C:\Users\Admin\Umbral1.exe
  "C:\Users\Admin\Umbral1.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1684
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:2340

C:\Users\Admin\RuntimeBroker
C:\Users\Admin\RuntimeBroker
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:5028

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
6d3e9c29fe44e90aae6ed30ccf799ca8

SHA1
c7974ef72264bbdf13a2793ccf1aed11bc565dce

SHA256
2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d

SHA512
60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a

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

Filesize
944B

MD5
5cfe303e798d1cc6c1dab341e7265c15

SHA1
cd2834e05191a24e28a100f3f8114d5a7708dc7c

SHA256
c4d16552769ca1762f6867bce85589c645ac3dc490b650083d74f853f898cfab

SHA512
ef151bbe0033a2caf2d40aff74855a3f42c8171e05a11c8ce93c7039d9430482c43fe93d9164ee94839aff253cad774dbf619dde9a8af38773ca66d59ac3400e

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\Temp\__PSScriptPolicyTest_2ejw003i.uq4.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpD9E0.tmp.bat

Filesize
146B

MD5
b5d4e44cf56134a76d98832e9f4923e8

SHA1
05a15f200af7bfdcd467fbfe286afa545438f388

SHA256
254ec6b271a5cd21728f41d92184d95790a38f0df0e94f9872fff097fb0fb033

SHA512
a674622d376a145282727f77cd084f7c7bff4cc098fc09d0f1ce69f81885c288e2aedca1203c72d47624b026ad8fd2600e84afda329c94ca77f8a9ce467a5ca4

Download Submit
C:\Users\Admin\Loader (1).exe

Filesize
827KB

MD5
eefb801774c5ccb44153268a9357f5f1

SHA1
b1906b22e14edd142c52808ab3e5ba9346b85de5

SHA256
677aeb1981c58cba41a5d53ccbbf5b471e62dc49dc326570767da940560d840d

SHA512
1cf162fe6184d68dca514059d2de1123e80d0faac401765a54224aa5a987c9454bc92263fbec566835aa7b402f1f63ba59bb425ccc139e0a7391e66991f270b7

Download Submit
C:\Users\Admin\RuntimeBroker.exe

Filesize
83KB

MD5
ed27f16daba642c2bc917e75e3b8fbaa

SHA1
b9e31e9835d2ca4a0490665559aadaa4c9e48c64

SHA256
97fcd56746339d2e17bc5627c5827ad0e2e18e8a114c764a951299ea5f3a27fe

SHA512
e5cab1626ab9824eb91cd79650b34840c29f10eaeb37cfbe2e024b21edc43d056b6e2cbd1edc949407a09ef10f75f477e2567f68c98078cf70d78d16f598bc91

Download Submit
C:\Users\Admin\Umbral1.exe

Filesize
231KB

MD5
844f85b3c38478161c8918e2d23a4835

SHA1
d2da62e3f0c50ddb3cc510af88368143790d59b9

SHA256
8f3ba7ae0aea1ad543fd98a1cb574bada9d363d476e12ae7a332ea83967883b5

SHA512
96d4ccdd853a7f878d0409f4f39f4f8fdd6bdf7d086ccd665e8f9141cf9ebc2916d079838e599c67c86cddfd02262c14cee434622821a8550c0dbd87535c95c7

Download Submit
memory/1684-89-0x00000201B64C0000-0x00000201B6500000-memory.dmp

Filesize
256KB

Download
memory/1684-97-0x00007FFA10840000-0x00007FFA11301000-memory.dmp

Filesize
10.8MB

Download
memory/1684-94-0x00007FFA10840000-0x00007FFA11301000-memory.dmp

Filesize
10.8MB

Download
memory/3316-93-0x00007FFA10840000-0x00007FFA11301000-memory.dmp

Filesize
10.8MB

Download
memory/3316-91-0x0000000000210000-0x000000000022C000-memory.dmp

Filesize
112KB

Download
memory/3316-149-0x00007FFA10840000-0x00007FFA11301000-memory.dmp

Filesize
10.8MB

Download
memory/3316-159-0x00007FFA10840000-0x00007FFA11301000-memory.dmp

Filesize
10.8MB

Download
memory/3424-0-0x00007FFA10843000-0x00007FFA10845000-memory.dmp

Filesize
8KB

Download
memory/3424-1-0x0000000000B20000-0x0000000000C46000-memory.dmp

Filesize
1.1MB

Download
memory/3992-100-0x000001C754100000-0x000001C754122000-memory.dmp

Filesize
136KB

Download
memory/5064-98-0x0000000008D10000-0x0000000008D48000-memory.dmp

Filesize
224KB

Download
memory/5064-99-0x0000000008CE0000-0x0000000008CEE000-memory.dmp

Filesize
56KB

Download
memory/5064-92-0x0000000000580000-0x0000000000656000-memory.dmp

Filesize
856KB

Download