umbral | 27fddb3ad83e8139d32ec09c8d6790b0ddd177c2e90f84f104c64010f91e4401

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
07-09-2024 10:07

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General

Target

bruteforcer.exe
Size

231KB
MD5

1e2b102dcdabbee48cd1308fba1f6719
SHA1

b657cdb68bb499c81f3746965ce63db8b8da7017
SHA256

27fddb3ad83e8139d32ec09c8d6790b0ddd177c2e90f84f104c64010f91e4401
SHA512

7e46052ca1abddd8fc993034cca84fe5d0752629d571a1dd4292a97c6c2a56906a20b7a910d3519ef875dfc1864333d01a8e223c9f18fa7fedf78dd9cdc5408d
SSDEEP

6144:sloZML9EBw/S6NtFnEPfCJxg8JhAA1HM0ryurdEwZThANnp8e1mGRw:qoZhYS6NZLg8JhAA1HM0ryurdEwZTh8C

Score

10^/10

umbral credential_access discovery execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/2996-1-0x0000000000E30000-0x0000000000E70000-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
2112	powershell.exe
2680	powershell.exe
2528	powershell.exe
1356	powershell.exe

Drops file in Drivers directory 1 IoCs

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

Deletes itself 1 IoCs

pid	Process
2760	cmd.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
9	discord.com
10	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
2760	cmd.exe
1724	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
1616	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1724	PING.EXE

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2996	bruteforcer.exe
2112	powershell.exe
2680	powershell.exe
2528	powershell.exe
3036	powershell.exe
1356	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2996	bruteforcer.exe
Token: SeIncreaseQuotaPrivilege	2376	wmic.exe
Token: SeSecurityPrivilege	2376	wmic.exe
Token: SeTakeOwnershipPrivilege	2376	wmic.exe
Token: SeLoadDriverPrivilege	2376	wmic.exe
Token: SeSystemProfilePrivilege	2376	wmic.exe
Token: SeSystemtimePrivilege	2376	wmic.exe
Token: SeProfSingleProcessPrivilege	2376	wmic.exe
Token: SeIncBasePriorityPrivilege	2376	wmic.exe
Token: SeCreatePagefilePrivilege	2376	wmic.exe
Token: SeBackupPrivilege	2376	wmic.exe
Token: SeRestorePrivilege	2376	wmic.exe
Token: SeShutdownPrivilege	2376	wmic.exe
Token: SeDebugPrivilege	2376	wmic.exe
Token: SeSystemEnvironmentPrivilege	2376	wmic.exe
Token: SeRemoteShutdownPrivilege	2376	wmic.exe
Token: SeUndockPrivilege	2376	wmic.exe
Token: SeManageVolumePrivilege	2376	wmic.exe
Token: 33	2376	wmic.exe
Token: 34	2376	wmic.exe
Token: 35	2376	wmic.exe
Token: SeIncreaseQuotaPrivilege	2376	wmic.exe
Token: SeSecurityPrivilege	2376	wmic.exe
Token: SeTakeOwnershipPrivilege	2376	wmic.exe
Token: SeLoadDriverPrivilege	2376	wmic.exe
Token: SeSystemProfilePrivilege	2376	wmic.exe
Token: SeSystemtimePrivilege	2376	wmic.exe
Token: SeProfSingleProcessPrivilege	2376	wmic.exe
Token: SeIncBasePriorityPrivilege	2376	wmic.exe
Token: SeCreatePagefilePrivilege	2376	wmic.exe
Token: SeBackupPrivilege	2376	wmic.exe
Token: SeRestorePrivilege	2376	wmic.exe
Token: SeShutdownPrivilege	2376	wmic.exe
Token: SeDebugPrivilege	2376	wmic.exe
Token: SeSystemEnvironmentPrivilege	2376	wmic.exe
Token: SeRemoteShutdownPrivilege	2376	wmic.exe
Token: SeUndockPrivilege	2376	wmic.exe
Token: SeManageVolumePrivilege	2376	wmic.exe
Token: 33	2376	wmic.exe
Token: 34	2376	wmic.exe
Token: 35	2376	wmic.exe
Token: SeDebugPrivilege	2112	powershell.exe
Token: SeDebugPrivilege	2680	powershell.exe
Token: SeDebugPrivilege	2528	powershell.exe
Token: SeDebugPrivilege	3036	powershell.exe
Token: SeIncreaseQuotaPrivilege	2000	wmic.exe
Token: SeSecurityPrivilege	2000	wmic.exe
Token: SeTakeOwnershipPrivilege	2000	wmic.exe
Token: SeLoadDriverPrivilege	2000	wmic.exe
Token: SeSystemProfilePrivilege	2000	wmic.exe
Token: SeSystemtimePrivilege	2000	wmic.exe
Token: SeProfSingleProcessPrivilege	2000	wmic.exe
Token: SeIncBasePriorityPrivilege	2000	wmic.exe
Token: SeCreatePagefilePrivilege	2000	wmic.exe
Token: SeBackupPrivilege	2000	wmic.exe
Token: SeRestorePrivilege	2000	wmic.exe
Token: SeShutdownPrivilege	2000	wmic.exe
Token: SeDebugPrivilege	2000	wmic.exe
Token: SeSystemEnvironmentPrivilege	2000	wmic.exe
Token: SeRemoteShutdownPrivilege	2000	wmic.exe
Token: SeUndockPrivilege	2000	wmic.exe
Token: SeManageVolumePrivilege	2000	wmic.exe
Token: 33	2000	wmic.exe
Token: 34	2000	wmic.exe

Suspicious use of WriteProcessMemory 39 IoCs

description	pid	Process	procid_target
PID 2996 wrote to memory of 2376	2996	bruteforcer.exe	30
PID 2996 wrote to memory of 2376	2996	bruteforcer.exe	30
PID 2996 wrote to memory of 2376	2996	bruteforcer.exe	30
PID 2996 wrote to memory of 484	2996	bruteforcer.exe	33
PID 2996 wrote to memory of 484	2996	bruteforcer.exe	33
PID 2996 wrote to memory of 484	2996	bruteforcer.exe	33
PID 2996 wrote to memory of 2112	2996	bruteforcer.exe	35
PID 2996 wrote to memory of 2112	2996	bruteforcer.exe	35
PID 2996 wrote to memory of 2112	2996	bruteforcer.exe	35
PID 2996 wrote to memory of 2680	2996	bruteforcer.exe	37
PID 2996 wrote to memory of 2680	2996	bruteforcer.exe	37
PID 2996 wrote to memory of 2680	2996	bruteforcer.exe	37
PID 2996 wrote to memory of 2528	2996	bruteforcer.exe	40
PID 2996 wrote to memory of 2528	2996	bruteforcer.exe	40
PID 2996 wrote to memory of 2528	2996	bruteforcer.exe	40
PID 2996 wrote to memory of 3036	2996	bruteforcer.exe	42
PID 2996 wrote to memory of 3036	2996	bruteforcer.exe	42
PID 2996 wrote to memory of 3036	2996	bruteforcer.exe	42
PID 2996 wrote to memory of 2000	2996	bruteforcer.exe	44
PID 2996 wrote to memory of 2000	2996	bruteforcer.exe	44
PID 2996 wrote to memory of 2000	2996	bruteforcer.exe	44
PID 2996 wrote to memory of 1936	2996	bruteforcer.exe	46
PID 2996 wrote to memory of 1936	2996	bruteforcer.exe	46
PID 2996 wrote to memory of 1936	2996	bruteforcer.exe	46
PID 2996 wrote to memory of 2452	2996	bruteforcer.exe	48
PID 2996 wrote to memory of 2452	2996	bruteforcer.exe	48
PID 2996 wrote to memory of 2452	2996	bruteforcer.exe	48
PID 2996 wrote to memory of 1356	2996	bruteforcer.exe	50
PID 2996 wrote to memory of 1356	2996	bruteforcer.exe	50
PID 2996 wrote to memory of 1356	2996	bruteforcer.exe	50
PID 2996 wrote to memory of 1616	2996	bruteforcer.exe	52
PID 2996 wrote to memory of 1616	2996	bruteforcer.exe	52
PID 2996 wrote to memory of 1616	2996	bruteforcer.exe	52
PID 2996 wrote to memory of 2760	2996	bruteforcer.exe	54
PID 2996 wrote to memory of 2760	2996	bruteforcer.exe	54
PID 2996 wrote to memory of 2760	2996	bruteforcer.exe	54
PID 2760 wrote to memory of 1724	2760	cmd.exe	56
PID 2760 wrote to memory of 1724	2760	cmd.exe	56
PID 2760 wrote to memory of 1724	2760	cmd.exe	56

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
484	attrib.exe

C:\Users\Admin\AppData\Local\Temp\bruteforcer.exe
"C:\Users\Admin\AppData\Local\Temp\bruteforcer.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2996
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2376
- C:\Windows\system32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\bruteforcer.exe"
  2⤵
  - Views/modifies file attributes
  PID:484
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\bruteforcer.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2112
- 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:2680
- 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:2528
- 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:3036
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2000
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:1936
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:2452
- 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:1356
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:1616
- C:\Windows\system32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\bruteforcer.exe" && pause
  2⤵
  - Deletes itself
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:2760
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:1724

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\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
159f3cb40e49ce0b3f6ce401fd0320ca

SHA1
5ce8c8acb4b17636ccabe7242139077fde90695a

SHA256
0e1d16689479b5af898f6c1ab46f182eaaafd875191e42bd9c11ba76b6d93f2d

SHA512
78dc7d15af96e9de9d5155ac0b28d1be100c681d76c263aefdfa408109ee8e979290043a3ad8c35b0e31db928b4089b83667327410c4fc2b18a990bc6451c76b

Download Submit
memory/1356-43-0x0000000001F70000-0x0000000001F78000-memory.dmp

Filesize
32KB

Download
memory/2112-7-0x000000001B5E0000-0x000000001B8C2000-memory.dmp

Filesize
2.9MB

Download
memory/2112-8-0x0000000002240000-0x0000000002248000-memory.dmp

Filesize
32KB

Download
memory/2680-14-0x000000001B670000-0x000000001B952000-memory.dmp

Filesize
2.9MB

Download
memory/2680-15-0x0000000002820000-0x0000000002828000-memory.dmp

Filesize
32KB

Download
memory/2996-0-0x000007FEF5B63000-0x000007FEF5B64000-memory.dmp

Filesize
4KB

Download
memory/2996-1-0x0000000000E30000-0x0000000000E70000-memory.dmp

Filesize
256KB

Download
memory/2996-2-0x000007FEF5B60000-0x000007FEF654C000-memory.dmp

Filesize
9.9MB

Download
memory/2996-47-0x000007FEF5B60000-0x000007FEF654C000-memory.dmp

Filesize
9.9MB

Download