umbral | 8a9330937d476297cf95bed9cb50f4cb82ee90c8fd538e89090727538e2a50dc

Analysis

max time kernel
122s
max time network
124s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
09-10-2024 21:07

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General

Target

xworm.exe
Size

229KB
MD5

c176d2ad8aae3ae3421647059931c8d9
SHA1

46cc2ff92c42f531cf2d41460031da365fd69a24
SHA256

8a9330937d476297cf95bed9cb50f4cb82ee90c8fd538e89090727538e2a50dc
SHA512

0739349b1a93f48d3600eb4d59ef4465e291270eaa7fb3c929c69ffd9d0f282c3305f1beec86e40f4a55ec13feb944fdf9ad4e0bdb2a2ad6a790dc6116386825
SSDEEP

6144:9loZM9rIkd8g+EtXHkv/iD4yeRV2U7X8ktoGnnGbBeb8e1mWbVi:foZOL+EP8yeRV2U7X8ktoGnnGbUE

Score

10^/10

umbral discovery execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/2440-1-0x0000000000910000-0x0000000000950000-memory.dmp	family_umbral

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral

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
2820	powershell.exe
2084	powershell.exe
3048	powershell.exe
2916	powershell.exe

Drops file in Drivers directory 1 IoCs

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

Deletes itself 1 IoCs

pid	Process
1204	cmd.exe

Reads user/profile data of web browsers 3 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

Credentials from Web Browsers
T1555.003

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

Web Service

T1102

flow	ioc
8	discord.com
9	discord.com

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

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
1204	cmd.exe
1036	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
1760	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1036	PING.EXE

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2820	powershell.exe
2084	powershell.exe
3048	powershell.exe
3012	powershell.exe
2916	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2440	xworm.exe
Token: SeDebugPrivilege	2820	powershell.exe
Token: SeDebugPrivilege	2084	powershell.exe
Token: SeDebugPrivilege	3048	powershell.exe
Token: SeDebugPrivilege	3012	powershell.exe
Token: SeIncreaseQuotaPrivilege	2872	wmic.exe
Token: SeSecurityPrivilege	2872	wmic.exe
Token: SeTakeOwnershipPrivilege	2872	wmic.exe
Token: SeLoadDriverPrivilege	2872	wmic.exe
Token: SeSystemProfilePrivilege	2872	wmic.exe
Token: SeSystemtimePrivilege	2872	wmic.exe
Token: SeProfSingleProcessPrivilege	2872	wmic.exe
Token: SeIncBasePriorityPrivilege	2872	wmic.exe
Token: SeCreatePagefilePrivilege	2872	wmic.exe
Token: SeBackupPrivilege	2872	wmic.exe
Token: SeRestorePrivilege	2872	wmic.exe
Token: SeShutdownPrivilege	2872	wmic.exe
Token: SeDebugPrivilege	2872	wmic.exe
Token: SeSystemEnvironmentPrivilege	2872	wmic.exe
Token: SeRemoteShutdownPrivilege	2872	wmic.exe
Token: SeUndockPrivilege	2872	wmic.exe
Token: SeManageVolumePrivilege	2872	wmic.exe
Token: 33	2872	wmic.exe
Token: 34	2872	wmic.exe
Token: 35	2872	wmic.exe
Token: SeIncreaseQuotaPrivilege	2872	wmic.exe
Token: SeSecurityPrivilege	2872	wmic.exe
Token: SeTakeOwnershipPrivilege	2872	wmic.exe
Token: SeLoadDriverPrivilege	2872	wmic.exe
Token: SeSystemProfilePrivilege	2872	wmic.exe
Token: SeSystemtimePrivilege	2872	wmic.exe
Token: SeProfSingleProcessPrivilege	2872	wmic.exe
Token: SeIncBasePriorityPrivilege	2872	wmic.exe
Token: SeCreatePagefilePrivilege	2872	wmic.exe
Token: SeBackupPrivilege	2872	wmic.exe
Token: SeRestorePrivilege	2872	wmic.exe
Token: SeShutdownPrivilege	2872	wmic.exe
Token: SeDebugPrivilege	2872	wmic.exe
Token: SeSystemEnvironmentPrivilege	2872	wmic.exe
Token: SeRemoteShutdownPrivilege	2872	wmic.exe
Token: SeUndockPrivilege	2872	wmic.exe
Token: SeManageVolumePrivilege	2872	wmic.exe
Token: 33	2872	wmic.exe
Token: 34	2872	wmic.exe
Token: 35	2872	wmic.exe
Token: SeIncreaseQuotaPrivilege	2868	wmic.exe
Token: SeSecurityPrivilege	2868	wmic.exe
Token: SeTakeOwnershipPrivilege	2868	wmic.exe
Token: SeLoadDriverPrivilege	2868	wmic.exe
Token: SeSystemProfilePrivilege	2868	wmic.exe
Token: SeSystemtimePrivilege	2868	wmic.exe
Token: SeProfSingleProcessPrivilege	2868	wmic.exe
Token: SeIncBasePriorityPrivilege	2868	wmic.exe
Token: SeCreatePagefilePrivilege	2868	wmic.exe
Token: SeBackupPrivilege	2868	wmic.exe
Token: SeRestorePrivilege	2868	wmic.exe
Token: SeShutdownPrivilege	2868	wmic.exe
Token: SeDebugPrivilege	2868	wmic.exe
Token: SeSystemEnvironmentPrivilege	2868	wmic.exe
Token: SeRemoteShutdownPrivilege	2868	wmic.exe
Token: SeUndockPrivilege	2868	wmic.exe
Token: SeManageVolumePrivilege	2868	wmic.exe
Token: 33	2868	wmic.exe
Token: 34	2868	wmic.exe

Suspicious use of WriteProcessMemory 36 IoCs

description	pid	Process	procid_target
PID 2440 wrote to memory of 2648	2440	xworm.exe	30
PID 2440 wrote to memory of 2648	2440	xworm.exe	30
PID 2440 wrote to memory of 2648	2440	xworm.exe	30
PID 2440 wrote to memory of 2820	2440	xworm.exe	32
PID 2440 wrote to memory of 2820	2440	xworm.exe	32
PID 2440 wrote to memory of 2820	2440	xworm.exe	32
PID 2440 wrote to memory of 2084	2440	xworm.exe	34
PID 2440 wrote to memory of 2084	2440	xworm.exe	34
PID 2440 wrote to memory of 2084	2440	xworm.exe	34
PID 2440 wrote to memory of 3048	2440	xworm.exe	36
PID 2440 wrote to memory of 3048	2440	xworm.exe	36
PID 2440 wrote to memory of 3048	2440	xworm.exe	36
PID 2440 wrote to memory of 3012	2440	xworm.exe	38
PID 2440 wrote to memory of 3012	2440	xworm.exe	38
PID 2440 wrote to memory of 3012	2440	xworm.exe	38
PID 2440 wrote to memory of 2872	2440	xworm.exe	40
PID 2440 wrote to memory of 2872	2440	xworm.exe	40
PID 2440 wrote to memory of 2872	2440	xworm.exe	40
PID 2440 wrote to memory of 2868	2440	xworm.exe	43
PID 2440 wrote to memory of 2868	2440	xworm.exe	43
PID 2440 wrote to memory of 2868	2440	xworm.exe	43
PID 2440 wrote to memory of 624	2440	xworm.exe	45
PID 2440 wrote to memory of 624	2440	xworm.exe	45
PID 2440 wrote to memory of 624	2440	xworm.exe	45
PID 2440 wrote to memory of 2916	2440	xworm.exe	47
PID 2440 wrote to memory of 2916	2440	xworm.exe	47
PID 2440 wrote to memory of 2916	2440	xworm.exe	47
PID 2440 wrote to memory of 1760	2440	xworm.exe	49
PID 2440 wrote to memory of 1760	2440	xworm.exe	49
PID 2440 wrote to memory of 1760	2440	xworm.exe	49
PID 2440 wrote to memory of 1204	2440	xworm.exe	51
PID 2440 wrote to memory of 1204	2440	xworm.exe	51
PID 2440 wrote to memory of 1204	2440	xworm.exe	51
PID 1204 wrote to memory of 1036	1204	cmd.exe	53
PID 1204 wrote to memory of 1036	1204	cmd.exe	53
PID 1204 wrote to memory of 1036	1204	cmd.exe	53

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2648	attrib.exe

C:\Users\Admin\AppData\Local\Temp\xworm.exe
"C:\Users\Admin\AppData\Local\Temp\xworm.exe"
1⤵
- Drops file in Drivers directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2440
- C:\Windows\system32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\xworm.exe"
  2⤵
  - Views/modifies file attributes
  PID:2648
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\xworm.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2820
- 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
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2084
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3048
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3012
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2872
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2868
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:624
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  PID:2916
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:1760
- C:\Windows\system32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\xworm.exe" && pause
  2⤵
  - Deletes itself
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:1204
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:1036

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Hide Artifacts

T1564

Hidden Files and Directories

T1564.001

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\WO3Z9VJ068ZJGMGABCGP.temp

Filesize
7KB

MD5
fb2901671e89bad7f313082880ff24e8

SHA1
0eea58ef29fbb97f79bc76f45afae2c929412075

SHA256
8cff6cded3b96609069ea1411387aa22e78e62bb15b4951cef95a4ccd260a401

SHA512
6b049dcb4bb736b70d35e9941adb2fd1ad346d18b20fda6d81090599b006f666ca37e45e39848e1992a70226d09d7fe79c7576777325974488e30c09841b41de

Download Submit
memory/2084-22-0x0000000001D20000-0x0000000001D28000-memory.dmp

Filesize
32KB

Download
memory/2084-21-0x000000001B5F0000-0x000000001B8D2000-memory.dmp

Filesize
2.9MB

Download
memory/2440-1-0x0000000000910000-0x0000000000950000-memory.dmp

Filesize
256KB

Download
memory/2440-2-0x000007FEF55D0000-0x000007FEF5FBC000-memory.dmp

Filesize
9.9MB

Download
memory/2440-53-0x000007FEF55D0000-0x000007FEF5FBC000-memory.dmp

Filesize
9.9MB

Download
memory/2440-0-0x000007FEF55D3000-0x000007FEF55D4000-memory.dmp

Filesize
4KB

Download
memory/2820-9-0x000007FEED850000-0x000007FEEE1ED000-memory.dmp

Filesize
9.6MB

Download
memory/2820-12-0x000007FEED850000-0x000007FEEE1ED000-memory.dmp

Filesize
9.6MB

Download
memory/2820-14-0x000007FEED850000-0x000007FEEE1ED000-memory.dmp

Filesize
9.6MB

Download
memory/2820-15-0x000007FEED850000-0x000007FEEE1ED000-memory.dmp

Filesize
9.6MB

Download
memory/2820-13-0x000007FEED850000-0x000007FEEE1ED000-memory.dmp

Filesize
9.6MB

Download
memory/2820-11-0x000007FEED850000-0x000007FEEE1ED000-memory.dmp

Filesize
9.6MB

Download
memory/2820-10-0x0000000001EF0000-0x0000000001EF8000-memory.dmp

Filesize
32KB

Download
memory/2820-8-0x000000001B6B0000-0x000000001B992000-memory.dmp

Filesize
2.9MB

Download
memory/2820-7-0x000007FEEDB0E000-0x000007FEEDB0F000-memory.dmp

Filesize
4KB

Download