umbral | 68be9bbac51892ca8e7f461d1509ae1058ba7b0a435658beebf10423ff5bad01

Analysis

max time kernel
133s
max time network
141s
platform
windows10-1703_x64
resource
win10-20240404-en
resource tags

arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
submitted
31/08/2024, 22:35

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

General

Target

WindowsFormsApp5.exe
Size

8KB
MD5

ef8b399d71141333959e41ec67917581
SHA1

896e70fe19495589eb4fd338f0ca4a09f406f983
SHA256

68be9bbac51892ca8e7f461d1509ae1058ba7b0a435658beebf10423ff5bad01
SHA512

7fa42a455bfa0c7e7fa8c67cbd0f2f3d61b8cf9afe8974e2f7a8381484a76adb3f155d71128599734d9b1b2e4eb494ed33c64f0f8148c1cf964cb57925d2fe16
SSDEEP

192:uJy2O0tL1YLu0pWzkLzLeLo/rrVCsfznxT12a5k:Ey2XtL+LjpWzkLzLeLorrVxfznxc

Score

10^/10

umbral credential_access discovery execution spyware stealer

Malware Config

Extracted

Family

umbral

https://discord.com/api/webhooks/1279545169913450556/F_7JgLiTKgmmhN5sN7p6WPAM8OYTa9TQPfck7MU2KymIAhgn1OZL-VqUQz_C_syu1_N1

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral1/files/0x000800000001ac21-9.dat	family_umbral
behavioral1/memory/2596-11-0x000001536CC70000-0x000001536CCB0000-memory.dmp	family_umbral

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral
Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
credential_access stealer

Credentials from Web Browsers
T1555.003

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
500	powershell.exe
4124	powershell.exe
3896	powershell.exe
1536	powershell.exe

Downloads MZ/PE file

Drops file in Drivers directory 1 IoCs

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

Executes dropped EXE 1 IoCs

pid	Process
2596	rbxUPDATE.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 4 IoCs

Web Service

T1102

flow	ioc
2	raw.githubusercontent.com
3	raw.githubusercontent.com
11	discord.com
12	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
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	WindowsFormsApp5.exe

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2920	wmic.exe

Suspicious behavior: EnumeratesProcesses 15 IoCs

pid	Process
500	powershell.exe
500	powershell.exe
500	powershell.exe
3896	powershell.exe
3896	powershell.exe
3896	powershell.exe
1536	powershell.exe
1536	powershell.exe
1536	powershell.exe
1572	powershell.exe
1572	powershell.exe
1572	powershell.exe
4124	powershell.exe
4124	powershell.exe
4124	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2516	WindowsFormsApp5.exe
Token: SeDebugPrivilege	2596	rbxUPDATE.exe
Token: SeDebugPrivilege	500	powershell.exe
Token: SeIncreaseQuotaPrivilege	500	powershell.exe
Token: SeSecurityPrivilege	500	powershell.exe
Token: SeTakeOwnershipPrivilege	500	powershell.exe
Token: SeLoadDriverPrivilege	500	powershell.exe
Token: SeSystemProfilePrivilege	500	powershell.exe
Token: SeSystemtimePrivilege	500	powershell.exe
Token: SeProfSingleProcessPrivilege	500	powershell.exe
Token: SeIncBasePriorityPrivilege	500	powershell.exe
Token: SeCreatePagefilePrivilege	500	powershell.exe
Token: SeBackupPrivilege	500	powershell.exe
Token: SeRestorePrivilege	500	powershell.exe
Token: SeShutdownPrivilege	500	powershell.exe
Token: SeDebugPrivilege	500	powershell.exe
Token: SeSystemEnvironmentPrivilege	500	powershell.exe
Token: SeRemoteShutdownPrivilege	500	powershell.exe
Token: SeUndockPrivilege	500	powershell.exe
Token: SeManageVolumePrivilege	500	powershell.exe
Token: 33	500	powershell.exe
Token: 34	500	powershell.exe
Token: 35	500	powershell.exe
Token: 36	500	powershell.exe
Token: SeDebugPrivilege	3896	powershell.exe
Token: SeDebugPrivilege	1536	powershell.exe
Token: SeDebugPrivilege	1572	powershell.exe
Token: SeIncreaseQuotaPrivilege	1416	wmic.exe
Token: SeSecurityPrivilege	1416	wmic.exe
Token: SeTakeOwnershipPrivilege	1416	wmic.exe
Token: SeLoadDriverPrivilege	1416	wmic.exe
Token: SeSystemProfilePrivilege	1416	wmic.exe
Token: SeSystemtimePrivilege	1416	wmic.exe
Token: SeProfSingleProcessPrivilege	1416	wmic.exe
Token: SeIncBasePriorityPrivilege	1416	wmic.exe
Token: SeCreatePagefilePrivilege	1416	wmic.exe
Token: SeBackupPrivilege	1416	wmic.exe
Token: SeRestorePrivilege	1416	wmic.exe
Token: SeShutdownPrivilege	1416	wmic.exe
Token: SeDebugPrivilege	1416	wmic.exe
Token: SeSystemEnvironmentPrivilege	1416	wmic.exe
Token: SeRemoteShutdownPrivilege	1416	wmic.exe
Token: SeUndockPrivilege	1416	wmic.exe
Token: SeManageVolumePrivilege	1416	wmic.exe
Token: 33	1416	wmic.exe
Token: 34	1416	wmic.exe
Token: 35	1416	wmic.exe
Token: 36	1416	wmic.exe
Token: SeIncreaseQuotaPrivilege	1416	wmic.exe
Token: SeSecurityPrivilege	1416	wmic.exe
Token: SeTakeOwnershipPrivilege	1416	wmic.exe
Token: SeLoadDriverPrivilege	1416	wmic.exe
Token: SeSystemProfilePrivilege	1416	wmic.exe
Token: SeSystemtimePrivilege	1416	wmic.exe
Token: SeProfSingleProcessPrivilege	1416	wmic.exe
Token: SeIncBasePriorityPrivilege	1416	wmic.exe
Token: SeCreatePagefilePrivilege	1416	wmic.exe
Token: SeBackupPrivilege	1416	wmic.exe
Token: SeRestorePrivilege	1416	wmic.exe
Token: SeShutdownPrivilege	1416	wmic.exe
Token: SeDebugPrivilege	1416	wmic.exe
Token: SeSystemEnvironmentPrivilege	1416	wmic.exe
Token: SeRemoteShutdownPrivilege	1416	wmic.exe
Token: SeUndockPrivilege	1416	wmic.exe

Suspicious use of FindShellTrayWindow 1 IoCs

pid	Process
2516	WindowsFormsApp5.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2516 wrote to memory of 2596	2516	WindowsFormsApp5.exe	75
PID 2516 wrote to memory of 2596	2516	WindowsFormsApp5.exe	75
PID 2596 wrote to memory of 500	2596	rbxUPDATE.exe	76
PID 2596 wrote to memory of 500	2596	rbxUPDATE.exe	76
PID 2596 wrote to memory of 3896	2596	rbxUPDATE.exe	79
PID 2596 wrote to memory of 3896	2596	rbxUPDATE.exe	79
PID 2596 wrote to memory of 1536	2596	rbxUPDATE.exe	81
PID 2596 wrote to memory of 1536	2596	rbxUPDATE.exe	81
PID 2596 wrote to memory of 1572	2596	rbxUPDATE.exe	83
PID 2596 wrote to memory of 1572	2596	rbxUPDATE.exe	83
PID 2596 wrote to memory of 1416	2596	rbxUPDATE.exe	85
PID 2596 wrote to memory of 1416	2596	rbxUPDATE.exe	85
PID 2596 wrote to memory of 2548	2596	rbxUPDATE.exe	88
PID 2596 wrote to memory of 2548	2596	rbxUPDATE.exe	88
PID 2596 wrote to memory of 5084	2596	rbxUPDATE.exe	90
PID 2596 wrote to memory of 5084	2596	rbxUPDATE.exe	90
PID 2596 wrote to memory of 4124	2596	rbxUPDATE.exe	92
PID 2596 wrote to memory of 4124	2596	rbxUPDATE.exe	92
PID 2596 wrote to memory of 2920	2596	rbxUPDATE.exe	94
PID 2596 wrote to memory of 2920	2596	rbxUPDATE.exe	94

C:\Users\Admin\AppData\Local\Temp\WindowsFormsApp5.exe
"C:\Users\Admin\AppData\Local\Temp\WindowsFormsApp5.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
PID:2516
- C:\Users\Admin\AppData\Local\Temp\rbxUPDATE.exe
  "C:\Users\Admin\AppData\Local\Temp\rbxUPDATE.exe"
  2⤵
  - Drops file in Drivers directory
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2596
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\rbxUPDATE.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:500
- - 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⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3896
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1536
- - 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:1572
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" os get Caption
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:1416
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" computersystem get totalphysicalmemory
    3⤵
    PID:2548
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    PID:5084
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    PID:4124
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic" path win32_VideoController get name
    3⤵
    - Detects videocard installed
    PID:2920

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

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Web Service

T1102

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
3KB

MD5
8592ba100a78835a6b94d5949e13dfc1

SHA1
63e901200ab9a57c7dd4c078d7f75dcd3b357020

SHA256
fdd7d9def6f9f0c0f2e60dbc8a2d1999071cd7d3095e9e087bb1cda7a614ac3c

SHA512
87f98e6cb61b2a2a7d65710c4d33881d89715eb7a06e00d492259f35c3902498baabffc5886be0ec5a14312ad4c262e3fc40cd3a5cb91701af0fb229726b88c3

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

Filesize
1KB

MD5
4347f57bcbda12548143742c401d1a7a

SHA1
fccab34c2a5c7ab01a1a644719c4c1435d5e9dc3

SHA256
c9e5171d7f3bcd90f1b4e2e2b93f8e6fec1c7d510e31e5ebecedc510dd579529

SHA512
d0bcd5c52502f75d6eef80b0b84ca717740453288b09aa3764f7721c9fadaadcd7c7aaae68746f87cc04e6d5a3463f3ad4b18232c55da317af369391c040ae66

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

Filesize
1KB

MD5
c70194033559b329a459097f7ad224c4

SHA1
161c58db2511666234096c633f6b276ef4c0cece

SHA256
dc4d4bf84f25a1e10053ba79f99870078745105aa6465631484d7e6515ddff69

SHA512
7ec19acc6ba129853c6c6d2242dfe724ac9d27410f1954fb3fb3a74c52fd110e24bec5e2a83d145e9b9a4da3142e0af5bab564a2af07ce17b45f3d181683bc47

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

Filesize
1KB

MD5
9e99aeefc8e6860a8f8e0d340533b16c

SHA1
f6809d9869faa80cd839578fe59ca7a2e3b66c5e

SHA256
62618a3bf08f564e4b8cf29cebed3498f668427e09506aa9fe6fdcd66deaaa2c

SHA512
a3ab90c67c8b8ff74167e10bc4a46ecf7ab7cce4326de08bf7c48a897217ddd20411929efd53b17d13b5fe329bdbe95edb3c14281ae4341eb1ae68da3ef91ba0

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

Filesize
1KB

MD5
4ada6ada86999644403fceedd1a7f40a

SHA1
ca769115eee76274c87f883c2ccca914d9895ff7

SHA256
9c475817330a2177a0e5f7fba969af7c99aeddb3f200619cc91810a6a399e007

SHA512
1718c30f5fba55ac0d2ea95f0f33283a5f9761e5ddb6f6857f8abaa2b65449eca69937f69a93f86dc73806b17a9ecfad159daa354716c9b2f0d1a19f741b0af9

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_otqnresp.ymf.ps1

Filesize
1B

MD5
c4ca4238a0b923820dcc509a6f75849b

SHA1
356a192b7913b04c54574d18c28d46e6395428ab

SHA256
6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b

SHA512
4dff4ea340f0a823f15d3f4f01ab62eae0e5da579ccb851f8db9dfe84c58b2b37b89903a740e1ee172da793a6e79d560e5f7f9bd058a12a280433ed6fa46510a

Download Submit
C:\Users\Admin\AppData\Local\Temp\rbxUPDATE.exe

Filesize
231KB

MD5
ee63a99349bb5cae11c6d9a8cc514394

SHA1
8461684b7f0caace91e1c4a623c734fcd02f60e8

SHA256
ed195cecc21f7c2527e75ab0609ab3507f46dc7f5fa52e11fadaea41dd199a2b

SHA512
dbdbc35181bef651ebf0f89f8d2623fde4a5a903c5d77a909da0d0dda77d99c674e117a64e64aca882ecb796fe8d71bc6e8c7846460e1b5ad7e8de5460070b34

Download Submit
memory/500-18-0x0000017A66F00000-0x0000017A66F22000-memory.dmp

Filesize
136KB

Download
memory/500-21-0x0000017A670B0000-0x0000017A67126000-memory.dmp

Filesize
472KB

Download
memory/2516-1-0x0000000000BD0000-0x0000000000BD8000-memory.dmp

Filesize
32KB

Download
memory/2516-2-0x00000000059F0000-0x0000000005EEE000-memory.dmp

Filesize
5.0MB

Download
memory/2516-189-0x00000000734E0000-0x0000000073BCE000-memory.dmp

Filesize
6.9MB

Download
memory/2516-0-0x00000000734EE000-0x00000000734EF000-memory.dmp

Filesize
4KB

Download
memory/2516-5-0x00000000734E0000-0x0000000073BCE000-memory.dmp

Filesize
6.9MB

Download
memory/2516-4-0x00000000054C0000-0x00000000054CA000-memory.dmp

Filesize
40KB

Download
memory/2516-184-0x00000000734EE000-0x00000000734EF000-memory.dmp

Filesize
4KB

Download
memory/2516-3-0x0000000005410000-0x00000000054A2000-memory.dmp

Filesize
584KB

Download
memory/2596-92-0x000001536EA00000-0x000001536EA1E000-memory.dmp

Filesize
120KB

Download
memory/2596-13-0x00007FF9338A0000-0x00007FF93428C000-memory.dmp

Filesize
9.9MB

Download
memory/2596-156-0x000001536EA20000-0x000001536EA2A000-memory.dmp

Filesize
40KB

Download
memory/2596-157-0x000001536F3E0000-0x000001536F3F2000-memory.dmp

Filesize
72KB

Download
memory/2596-11-0x000001536CC70000-0x000001536CCB0000-memory.dmp

Filesize
256KB

Download
memory/2596-91-0x000001536F390000-0x000001536F3E0000-memory.dmp

Filesize
320KB

Download
memory/2596-188-0x000001536E9B0000-0x000001536E9D1000-memory.dmp

Filesize
132KB

Download
memory/2596-12-0x00007FF9338A3000-0x00007FF9338A4000-memory.dmp

Filesize
4KB

Download
memory/2596-190-0x00007FF9338A0000-0x00007FF93428C000-memory.dmp

Filesize
9.9MB

Download