umbral | 27fddb3ad83e8139d32ec09c8d6790b0ddd177c2e90f84f104c64010f91e4401

Analysis

max time kernel
122s
max time network
125s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
07-09-2024 11:42

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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/2432-1-0x0000000000390000-0x00000000003D0000-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

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
1316	powershell.exe
1740	powershell.exe
1212	powershell.exe
1108	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
2344	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 1 IoCs

Web Service

T1102

flow	ioc
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
2344	cmd.exe
568	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
948	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
568	PING.EXE

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2432	bruteforcer.exe
1108	powershell.exe
1316	powershell.exe
1740	powershell.exe
1004	powershell.exe
1212	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2432	bruteforcer.exe
Token: SeIncreaseQuotaPrivilege	2860	wmic.exe
Token: SeSecurityPrivilege	2860	wmic.exe
Token: SeTakeOwnershipPrivilege	2860	wmic.exe
Token: SeLoadDriverPrivilege	2860	wmic.exe
Token: SeSystemProfilePrivilege	2860	wmic.exe
Token: SeSystemtimePrivilege	2860	wmic.exe
Token: SeProfSingleProcessPrivilege	2860	wmic.exe
Token: SeIncBasePriorityPrivilege	2860	wmic.exe
Token: SeCreatePagefilePrivilege	2860	wmic.exe
Token: SeBackupPrivilege	2860	wmic.exe
Token: SeRestorePrivilege	2860	wmic.exe
Token: SeShutdownPrivilege	2860	wmic.exe
Token: SeDebugPrivilege	2860	wmic.exe
Token: SeSystemEnvironmentPrivilege	2860	wmic.exe
Token: SeRemoteShutdownPrivilege	2860	wmic.exe
Token: SeUndockPrivilege	2860	wmic.exe
Token: SeManageVolumePrivilege	2860	wmic.exe
Token: 33	2860	wmic.exe
Token: 34	2860	wmic.exe
Token: 35	2860	wmic.exe
Token: SeIncreaseQuotaPrivilege	2860	wmic.exe
Token: SeSecurityPrivilege	2860	wmic.exe
Token: SeTakeOwnershipPrivilege	2860	wmic.exe
Token: SeLoadDriverPrivilege	2860	wmic.exe
Token: SeSystemProfilePrivilege	2860	wmic.exe
Token: SeSystemtimePrivilege	2860	wmic.exe
Token: SeProfSingleProcessPrivilege	2860	wmic.exe
Token: SeIncBasePriorityPrivilege	2860	wmic.exe
Token: SeCreatePagefilePrivilege	2860	wmic.exe
Token: SeBackupPrivilege	2860	wmic.exe
Token: SeRestorePrivilege	2860	wmic.exe
Token: SeShutdownPrivilege	2860	wmic.exe
Token: SeDebugPrivilege	2860	wmic.exe
Token: SeSystemEnvironmentPrivilege	2860	wmic.exe
Token: SeRemoteShutdownPrivilege	2860	wmic.exe
Token: SeUndockPrivilege	2860	wmic.exe
Token: SeManageVolumePrivilege	2860	wmic.exe
Token: 33	2860	wmic.exe
Token: 34	2860	wmic.exe
Token: 35	2860	wmic.exe
Token: SeDebugPrivilege	1108	powershell.exe
Token: SeDebugPrivilege	1316	powershell.exe
Token: SeDebugPrivilege	1740	powershell.exe
Token: SeDebugPrivilege	1004	powershell.exe
Token: SeIncreaseQuotaPrivilege	852	wmic.exe
Token: SeSecurityPrivilege	852	wmic.exe
Token: SeTakeOwnershipPrivilege	852	wmic.exe
Token: SeLoadDriverPrivilege	852	wmic.exe
Token: SeSystemProfilePrivilege	852	wmic.exe
Token: SeSystemtimePrivilege	852	wmic.exe
Token: SeProfSingleProcessPrivilege	852	wmic.exe
Token: SeIncBasePriorityPrivilege	852	wmic.exe
Token: SeCreatePagefilePrivilege	852	wmic.exe
Token: SeBackupPrivilege	852	wmic.exe
Token: SeRestorePrivilege	852	wmic.exe
Token: SeShutdownPrivilege	852	wmic.exe
Token: SeDebugPrivilege	852	wmic.exe
Token: SeSystemEnvironmentPrivilege	852	wmic.exe
Token: SeRemoteShutdownPrivilege	852	wmic.exe
Token: SeUndockPrivilege	852	wmic.exe
Token: SeManageVolumePrivilege	852	wmic.exe
Token: 33	852	wmic.exe
Token: 34	852	wmic.exe

Suspicious use of WriteProcessMemory 39 IoCs

description	pid	Process	procid_target
PID 2432 wrote to memory of 2860	2432	bruteforcer.exe	31
PID 2432 wrote to memory of 2860	2432	bruteforcer.exe	31
PID 2432 wrote to memory of 2860	2432	bruteforcer.exe	31
PID 2432 wrote to memory of 868	2432	bruteforcer.exe	34
PID 2432 wrote to memory of 868	2432	bruteforcer.exe	34
PID 2432 wrote to memory of 868	2432	bruteforcer.exe	34
PID 2432 wrote to memory of 1108	2432	bruteforcer.exe	36
PID 2432 wrote to memory of 1108	2432	bruteforcer.exe	36
PID 2432 wrote to memory of 1108	2432	bruteforcer.exe	36
PID 2432 wrote to memory of 1316	2432	bruteforcer.exe	38
PID 2432 wrote to memory of 1316	2432	bruteforcer.exe	38
PID 2432 wrote to memory of 1316	2432	bruteforcer.exe	38
PID 2432 wrote to memory of 1740	2432	bruteforcer.exe	40
PID 2432 wrote to memory of 1740	2432	bruteforcer.exe	40
PID 2432 wrote to memory of 1740	2432	bruteforcer.exe	40
PID 2432 wrote to memory of 1004	2432	bruteforcer.exe	42
PID 2432 wrote to memory of 1004	2432	bruteforcer.exe	42
PID 2432 wrote to memory of 1004	2432	bruteforcer.exe	42
PID 2432 wrote to memory of 852	2432	bruteforcer.exe	44
PID 2432 wrote to memory of 852	2432	bruteforcer.exe	44
PID 2432 wrote to memory of 852	2432	bruteforcer.exe	44
PID 2432 wrote to memory of 2460	2432	bruteforcer.exe	46
PID 2432 wrote to memory of 2460	2432	bruteforcer.exe	46
PID 2432 wrote to memory of 2460	2432	bruteforcer.exe	46
PID 2432 wrote to memory of 940	2432	bruteforcer.exe	48
PID 2432 wrote to memory of 940	2432	bruteforcer.exe	48
PID 2432 wrote to memory of 940	2432	bruteforcer.exe	48
PID 2432 wrote to memory of 1212	2432	bruteforcer.exe	50
PID 2432 wrote to memory of 1212	2432	bruteforcer.exe	50
PID 2432 wrote to memory of 1212	2432	bruteforcer.exe	50
PID 2432 wrote to memory of 948	2432	bruteforcer.exe	52
PID 2432 wrote to memory of 948	2432	bruteforcer.exe	52
PID 2432 wrote to memory of 948	2432	bruteforcer.exe	52
PID 2432 wrote to memory of 2344	2432	bruteforcer.exe	54
PID 2432 wrote to memory of 2344	2432	bruteforcer.exe	54
PID 2432 wrote to memory of 2344	2432	bruteforcer.exe	54
PID 2344 wrote to memory of 568	2344	cmd.exe	56
PID 2344 wrote to memory of 568	2344	cmd.exe	56
PID 2344 wrote to memory of 568	2344	cmd.exe	56

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
868	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:2432
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2860
- C:\Windows\system32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\bruteforcer.exe"
  2⤵
  - Views/modifies file attributes
  PID:868
- 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:1108
- 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:1316
- 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:1740
- 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:1004
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:852
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:2460
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:940
- 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:1212
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:948
- 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:2344
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:568

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
8d24076365ff3699b356115784968a90

SHA1
431cd659a998f0d9f8c2871b3a9f2f7d27feba10

SHA256
15087eddcc3bedafd27bc6e98d75521b4e34e3fa6195198752990f13654d1253

SHA512
ff5b1ef8793d7f61bc7333a3a22f1813b3ad316fd24715355f7b1766382de3f27a196e0176c7f781755ece93c233c88be395c0d121480eb8924343a699207a6d

Download Submit
memory/1108-10-0x0000000001E70000-0x0000000001E78000-memory.dmp

Filesize
32KB

Download
memory/1108-9-0x000000001B780000-0x000000001BA62000-memory.dmp

Filesize
2.9MB

Download
memory/1212-46-0x00000000027A0000-0x00000000027A8000-memory.dmp

Filesize
32KB

Download
memory/1316-17-0x0000000002240000-0x0000000002248000-memory.dmp

Filesize
32KB

Download
memory/1316-16-0x000000001B650000-0x000000001B932000-memory.dmp

Filesize
2.9MB

Download
memory/2432-4-0x000007FEF5520000-0x000007FEF5F0C000-memory.dmp

Filesize
9.9MB

Download
memory/2432-3-0x000007FEF5523000-0x000007FEF5524000-memory.dmp

Filesize
4KB

Download
memory/2432-0-0x000007FEF5523000-0x000007FEF5524000-memory.dmp

Filesize
4KB

Download
memory/2432-2-0x000007FEF5520000-0x000007FEF5F0C000-memory.dmp

Filesize
9.9MB

Download
memory/2432-1-0x0000000000390000-0x00000000003D0000-memory.dmp

Filesize
256KB

Download
memory/2432-50-0x000007FEF5520000-0x000007FEF5F0C000-memory.dmp

Filesize
9.9MB

Download