umbral | 27fddb3ad83e8139d32ec09c8d6790b0ddd177c2e90f84f104c64010f91e4401

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-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 execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral2/memory/4184-1-0x000001EACCB70000-0x000001EACCBB0000-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 3 IoCs

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

execution

PowerShell

T1059.001

pid	Process
2596	powershell.exe
872	powershell.exe
2264	powershell.exe

Drops file in Drivers directory 1 IoCs

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

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

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
4184	bruteforcer.exe
2596	powershell.exe
2596	powershell.exe
872	powershell.exe
872	powershell.exe
2264	powershell.exe
2264	powershell.exe
488	powershell.exe
488	powershell.exe

Suspicious use of AdjustPrivilegeToken 47 IoCs

description	pid	Process
Token: SeDebugPrivilege	4184	bruteforcer.exe
Token: SeIncreaseQuotaPrivilege	1420	wmic.exe
Token: SeSecurityPrivilege	1420	wmic.exe
Token: SeTakeOwnershipPrivilege	1420	wmic.exe
Token: SeLoadDriverPrivilege	1420	wmic.exe
Token: SeSystemProfilePrivilege	1420	wmic.exe
Token: SeSystemtimePrivilege	1420	wmic.exe
Token: SeProfSingleProcessPrivilege	1420	wmic.exe
Token: SeIncBasePriorityPrivilege	1420	wmic.exe
Token: SeCreatePagefilePrivilege	1420	wmic.exe
Token: SeBackupPrivilege	1420	wmic.exe
Token: SeRestorePrivilege	1420	wmic.exe
Token: SeShutdownPrivilege	1420	wmic.exe
Token: SeDebugPrivilege	1420	wmic.exe
Token: SeSystemEnvironmentPrivilege	1420	wmic.exe
Token: SeRemoteShutdownPrivilege	1420	wmic.exe
Token: SeUndockPrivilege	1420	wmic.exe
Token: SeManageVolumePrivilege	1420	wmic.exe
Token: 33	1420	wmic.exe
Token: 34	1420	wmic.exe
Token: 35	1420	wmic.exe
Token: 36	1420	wmic.exe
Token: SeIncreaseQuotaPrivilege	1420	wmic.exe
Token: SeSecurityPrivilege	1420	wmic.exe
Token: SeTakeOwnershipPrivilege	1420	wmic.exe
Token: SeLoadDriverPrivilege	1420	wmic.exe
Token: SeSystemProfilePrivilege	1420	wmic.exe
Token: SeSystemtimePrivilege	1420	wmic.exe
Token: SeProfSingleProcessPrivilege	1420	wmic.exe
Token: SeIncBasePriorityPrivilege	1420	wmic.exe
Token: SeCreatePagefilePrivilege	1420	wmic.exe
Token: SeBackupPrivilege	1420	wmic.exe
Token: SeRestorePrivilege	1420	wmic.exe
Token: SeShutdownPrivilege	1420	wmic.exe
Token: SeDebugPrivilege	1420	wmic.exe
Token: SeSystemEnvironmentPrivilege	1420	wmic.exe
Token: SeRemoteShutdownPrivilege	1420	wmic.exe
Token: SeUndockPrivilege	1420	wmic.exe
Token: SeManageVolumePrivilege	1420	wmic.exe
Token: 33	1420	wmic.exe
Token: 34	1420	wmic.exe
Token: 35	1420	wmic.exe
Token: 36	1420	wmic.exe
Token: SeDebugPrivilege	2596	powershell.exe
Token: SeDebugPrivilege	872	powershell.exe
Token: SeDebugPrivilege	2264	powershell.exe
Token: SeDebugPrivilege	488	powershell.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 4184 wrote to memory of 1420	4184	bruteforcer.exe	84
PID 4184 wrote to memory of 1420	4184	bruteforcer.exe	84
PID 4184 wrote to memory of 1828	4184	bruteforcer.exe	89
PID 4184 wrote to memory of 1828	4184	bruteforcer.exe	89
PID 4184 wrote to memory of 2596	4184	bruteforcer.exe	91
PID 4184 wrote to memory of 2596	4184	bruteforcer.exe	91
PID 4184 wrote to memory of 872	4184	bruteforcer.exe	93
PID 4184 wrote to memory of 872	4184	bruteforcer.exe	93
PID 4184 wrote to memory of 2264	4184	bruteforcer.exe	95
PID 4184 wrote to memory of 2264	4184	bruteforcer.exe	95
PID 4184 wrote to memory of 488	4184	bruteforcer.exe	97
PID 4184 wrote to memory of 488	4184	bruteforcer.exe	97

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
1828	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:4184
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1420
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\bruteforcer.exe"
  2⤵
  - Views/modifies file attributes
  PID:1828
- 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:2596
- 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:872
- 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:2264
- 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:488

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

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

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

Filesize
944B

MD5
5a1eeec361ba5d0671ba459c85a6e1d7

SHA1
a51cdcd13a6b13e842a2ee977f6d1091d63d706f

SHA256
8804fca07f0a87233d848fc260b92e03567ecbee6f903fa0594cb78b11730174

SHA512
c41e69d0485c031e49d2505bf531579134147d983d19c3d7d5e3c8f7f6eea5441c830c3eda0f396b54737f30157c9543b68901a79e919ab9f6cc93e6beea345e

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

Filesize
948B

MD5
c65738617888921a153bd9b1ef516ee7

SHA1
5245e71ea3c181d76320c857b639272ac9e079b1

SHA256
4640ba4001fd16a593315299cbdd4988dc2c7075820687f1018aac40aca95c26

SHA512
2e2a0ebd93f9d8dd07a7599054bce232683e9add9a35e77b584618040bcfd84a42545352519ec4736cc379002210b6f3ed2d905591c6925c0981b0392b495bfa

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

Filesize
1KB

MD5
88be3bc8a7f90e3953298c0fdbec4d72

SHA1
f4969784ad421cc80ef45608727aacd0f6bf2e4b

SHA256
533c8470b41084e40c5660569ebbdb7496520d449629a235e8053e84025f348a

SHA512
4fce64e2dacddbc03314048fef1ce356ee2647c14733da121c23c65507eeb8d721d6b690ad5463319b364dc4fa95904ad6ab096907f32918e3406ef438a6ef7c

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ute3bmxe.ox2.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2596-4-0x00007FFAF6970000-0x00007FFAF7431000-memory.dmp

Filesize
10.8MB

Download
memory/2596-14-0x0000016469130000-0x0000016469152000-memory.dmp

Filesize
136KB

Download
memory/2596-15-0x00007FFAF6970000-0x00007FFAF7431000-memory.dmp

Filesize
10.8MB

Download
memory/2596-18-0x00007FFAF6970000-0x00007FFAF7431000-memory.dmp

Filesize
10.8MB

Download
memory/2596-3-0x00007FFAF6970000-0x00007FFAF7431000-memory.dmp

Filesize
10.8MB

Download
memory/4184-34-0x000001EACE9A0000-0x000001EACE9F0000-memory.dmp

Filesize
320KB

Download
memory/4184-33-0x000001EAE7330000-0x000001EAE73A6000-memory.dmp

Filesize
472KB

Download
memory/4184-2-0x00007FFAF6970000-0x00007FFAF7431000-memory.dmp

Filesize
10.8MB

Download
memory/4184-35-0x000001EACE960000-0x000001EACE97E000-memory.dmp

Filesize
120KB

Download
memory/4184-1-0x000001EACCB70000-0x000001EACCBB0000-memory.dmp

Filesize
256KB

Download
memory/4184-0-0x00007FFAF6973000-0x00007FFAF6975000-memory.dmp

Filesize
8KB

Download
memory/4184-71-0x000001EACE940000-0x000001EACE94A000-memory.dmp

Filesize
40KB

Download
memory/4184-72-0x000001EACE9F0000-0x000001EACEA02000-memory.dmp

Filesize
72KB

Download
memory/4184-75-0x00007FFAF6973000-0x00007FFAF6975000-memory.dmp

Filesize
8KB

Download
memory/4184-76-0x00007FFAF6970000-0x00007FFAF7431000-memory.dmp

Filesize
10.8MB

Download
memory/4184-77-0x00007FFAF6970000-0x00007FFAF7431000-memory.dmp

Filesize
10.8MB

Download