umbral | 338c220997baa0485c25470cde2f7c2d4ef75160eb873192a5365a2e0e8f715c

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
18/05/2024, 19:50

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General

Target
XClient.exe
Size 102KB
Sample240518-ykdbpace2s
SHA256 338c220997baa0485c25470cde2f7c2d4ef75160eb873192a5365a2e0e8f715c
MD5 5e24357f522943541ff27ef9b9bb562a
SHA1 61866fdd5e79a11c867b47d76c15db24e785ecd2
SHA512 658d3d5951a239ecd409a567d59b59db009ac4c86dc2a1b92eaab32ae568410c8262901b1acfc4eae486f39adb0d374a533f227649fccc94193a6b849929df59
SSDEEP 1536:eqyNVGF7YnjFF8pNhgUGSL1bWZR9/CJbZT6YdaOpYYVfccAvizZuvdigE:SV/njFF8r5fbWZR+54OpYJ1quvdiv
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

umbral xworm execution persistence rat spyware stealer trojan

Malware Config

Extracted

Family

xworm

subjects-handbook.gl.at.ply.gg:56071

Attributes

Install_directory
%AppData%
install_file
svchost.exe

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral2/files/0x000a00000002348f-70.dat	family_umbral
behavioral2/memory/688-77-0x000001BA00110000-0x000001BA00150000-memory.dmp	family_umbral

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/1688-0-0x0000000000760000-0x0000000000780000-memory.dmp	family_xworm
behavioral2/files/0x000f0000000233e3-61.dat	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 5 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
4968	powershell.exe
3792	powershell.exe
3092	powershell.exe
4152	powershell.exe
4924	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	tigkdx.exe

Checks computer location settings 2 TTPs 1 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-1-5-21-3571316656-3665257725-2415531812-1000\Control Panel\International\Geo\Nation	XClient.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.lnk	XClient.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.lnk	XClient.exe

Executes dropped EXE 3 IoCs

pid	Process
4652	svchost.exe
1932	svchost.exe
688	tigkdx.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

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-1-5-21-3571316656-3665257725-2415531812-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\svchost = "C:\\Users\\Admin\\AppData\\Roaming\\svchost.exe"	XClient.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
78	discord.com
79	discord.com

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
24	ip-api.com
74	ip-api.com

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
4688	schtasks.exe

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
4264	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
696	PING.EXE

Suspicious behavior: EnumeratesProcesses 20 IoCs

pid	Process
4924	powershell.exe
4924	powershell.exe
4968	powershell.exe
4968	powershell.exe
3792	powershell.exe
3792	powershell.exe
3092	powershell.exe
3092	powershell.exe
1688	XClient.exe
688	tigkdx.exe
4152	powershell.exe
4152	powershell.exe
2204	powershell.exe
2204	powershell.exe
2908	powershell.exe
2908	powershell.exe
2368	powershell.exe
2368	powershell.exe
3180	powershell.exe
3180	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	1688	XClient.exe
Token: SeDebugPrivilege	4924	powershell.exe
Token: SeDebugPrivilege	4968	powershell.exe
Token: SeDebugPrivilege	3792	powershell.exe
Token: SeDebugPrivilege	3092	powershell.exe
Token: SeDebugPrivilege	1688	XClient.exe
Token: SeDebugPrivilege	4652	svchost.exe
Token: SeDebugPrivilege	1932	svchost.exe
Token: SeDebugPrivilege	688	tigkdx.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	4152	powershell.exe
Token: SeDebugPrivilege	2204	powershell.exe
Token: SeDebugPrivilege	2908	powershell.exe
Token: SeDebugPrivilege	2368	powershell.exe
Token: SeIncreaseQuotaPrivilege	536	wmic.exe
Token: SeSecurityPrivilege	536	wmic.exe
Token: SeTakeOwnershipPrivilege	536	wmic.exe
Token: SeLoadDriverPrivilege	536	wmic.exe
Token: SeSystemProfilePrivilege	536	wmic.exe
Token: SeSystemtimePrivilege	536	wmic.exe
Token: SeProfSingleProcessPrivilege	536	wmic.exe
Token: SeIncBasePriorityPrivilege	536	wmic.exe
Token: SeCreatePagefilePrivilege	536	wmic.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1688	XClient.exe

Suspicious use of WriteProcessMemory 38 IoCs

description	pid	Process	procid_target
PID 1688 wrote to memory of 4924	1688	XClient.exe	90
PID 1688 wrote to memory of 4924	1688	XClient.exe	90
PID 1688 wrote to memory of 4968	1688	XClient.exe	93
PID 1688 wrote to memory of 4968	1688	XClient.exe	93
PID 1688 wrote to memory of 3792	1688	XClient.exe	96
PID 1688 wrote to memory of 3792	1688	XClient.exe	96
PID 1688 wrote to memory of 3092	1688	XClient.exe	98
PID 1688 wrote to memory of 3092	1688	XClient.exe	98
PID 1688 wrote to memory of 4688	1688	XClient.exe	100
PID 1688 wrote to memory of 4688	1688	XClient.exe	100
PID 1688 wrote to memory of 688	1688	XClient.exe	118
PID 1688 wrote to memory of 688	1688	XClient.exe	118
PID 688 wrote to memory of 2340	688	tigkdx.exe	119
PID 688 wrote to memory of 2340	688	tigkdx.exe	119
PID 688 wrote to memory of 4444	688	tigkdx.exe	122
PID 688 wrote to memory of 4444	688	tigkdx.exe	122
PID 688 wrote to memory of 4152	688	tigkdx.exe	124
PID 688 wrote to memory of 4152	688	tigkdx.exe	124
PID 688 wrote to memory of 2204	688	tigkdx.exe	126
PID 688 wrote to memory of 2204	688	tigkdx.exe	126
PID 688 wrote to memory of 2908	688	tigkdx.exe	128
PID 688 wrote to memory of 2908	688	tigkdx.exe	128
PID 688 wrote to memory of 2368	688	tigkdx.exe	130
PID 688 wrote to memory of 2368	688	tigkdx.exe	130
PID 688 wrote to memory of 536	688	tigkdx.exe	132
PID 688 wrote to memory of 536	688	tigkdx.exe	132
PID 688 wrote to memory of 1184	688	tigkdx.exe	134
PID 688 wrote to memory of 1184	688	tigkdx.exe	134
PID 688 wrote to memory of 4396	688	tigkdx.exe	136
PID 688 wrote to memory of 4396	688	tigkdx.exe	136
PID 688 wrote to memory of 3180	688	tigkdx.exe	138
PID 688 wrote to memory of 3180	688	tigkdx.exe	138
PID 688 wrote to memory of 4264	688	tigkdx.exe	140
PID 688 wrote to memory of 4264	688	tigkdx.exe	140
PID 688 wrote to memory of 5068	688	tigkdx.exe	142
PID 688 wrote to memory of 5068	688	tigkdx.exe	142
PID 5068 wrote to memory of 696	5068	cmd.exe	144
PID 5068 wrote to memory of 696	5068	cmd.exe	144

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

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
4444	attrib.exe

C:\Users\Admin\AppData\Local\Temp\XClient.exe
"C:\Users\Admin\AppData\Local\Temp\XClient.exe"
1⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1688
- 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\Local\Temp\XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4924
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4968
- 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\svchost.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3792
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'svchost.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3092
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "svchost" /tr "C:\Users\Admin\AppData\Roaming\svchost.exe"
  2⤵
  - Creates scheduled task(s)
  PID:4688
- C:\Users\Admin\AppData\Local\Temp\tigkdx.exe
  "C:\Users\Admin\AppData\Local\Temp\tigkdx.exe"
  2⤵
  - Drops file in Drivers directory
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:688
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:2340
- - C:\Windows\SYSTEM32\attrib.exe
    "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\tigkdx.exe"
    3⤵
    - Views/modifies file attributes
    PID:4444
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\tigkdx.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4152
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Set-MpPreference -DisableIntrusionPreventionSystem $true -DisableIOAVProtection $true -DisableRealtimeMonitoring $true -DisableScriptScanning $true -EnableControlledFolderAccess Disabled -EnableNetworkProtection AuditMode -Force -MAPSReporting Disabled -SubmitSamplesConsent NeverSend && powershell Set-MpPreference -SubmitSamplesConsent 2
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2204
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2908
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2368
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" os get Caption
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:536
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" computersystem get totalphysicalmemory
    3⤵
    PID:1184
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    PID:4396
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    PID:3180
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic" path win32_VideoController get name
    3⤵
    - Detects videocard installed
    PID:4264
- - C:\Windows\SYSTEM32\cmd.exe
    "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\tigkdx.exe" && pause
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:5068
  - - C:\Windows\system32\PING.EXE
      ping localhost
      4⤵
      Runs ping.exe
      PID:696

C:\Users\Admin\AppData\Roaming\svchost.exe
C:\Users\Admin\AppData\Roaming\svchost.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4652

C:\Users\Admin\AppData\Roaming\svchost.exe
C:\Users\Admin\AppData\Roaming\svchost.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1932

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Scheduled Task/Job

T1053

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Modify Registry

T1112

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

powershell.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
Size 2KB
SHA256 84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f
MD5 d85ba6ff808d9e5444a4b369f5bc2730
SHA1 31aa9d96590fff6981b315e0b391b575e4c0804a
SHA512 8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249
MD5 SHA1 SHA512

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svchost.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\svchost.exe.log
Size 654B
SHA256 e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced
MD5 2ff39f6c7249774be85fd60a8f9a245e
SHA1 684ff36b31aedc1e587c8496c02722c6698c1c4e
SHA512 1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1
MD5 SHA1 SHA512

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