umbral | 256aa419764dc6cf6fef1a4bbe7a918c207c48515e9e13d18881a69b326c79f0

Resubmissions

26-07-2024 22:22

240726-2ap5aaycqq 10

Analysis

max time kernel
148s
max time network
156s
platform
windows10-2004_x64
resource
win10v2004-20240709-en
resource tags

arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
submitted
26-07-2024 22:22

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General

Target

Umbral.exe
Size

229KB
MD5

7b8f7224e44d39c521160c3b33e22e98
SHA1

a8ab775e550aef4aa3b2f485116bcc245c7ccb48
SHA256

256aa419764dc6cf6fef1a4bbe7a918c207c48515e9e13d18881a69b326c79f0
SHA512

c11c922edb6d3aa634fd68dc59a86463fd29b27eead95864efc003fcbb226610854f3acceff7b580fb96443952aa68696f87ea4004e01af96eca570a75359859
SSDEEP

6144:tloZM9rIkd8g+EtXHkv/iD4u5PpSQPL42BECDja/yb8e1mUZJi:voZmL+EP8u5PpSQPL42BECDjamp+

Score

10^/10

umbral credential_access discovery execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral3/memory/4788-1-0x000001A6BDF10000-0x000001A6BDF50000-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
1412	powershell.exe
4536	powershell.exe
640	powershell.exe
1592	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
27	discord.com
28	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
9	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
920	cmd.exe
764	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
216	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
764	PING.EXE

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
4788	Umbral.exe
1412	powershell.exe
1412	powershell.exe
4536	powershell.exe
4536	powershell.exe
640	powershell.exe
640	powershell.exe
676	powershell.exe
676	powershell.exe
1592	powershell.exe
1592	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	4788	Umbral.exe
Token: SeIncreaseQuotaPrivilege	3252	wmic.exe
Token: SeSecurityPrivilege	3252	wmic.exe
Token: SeTakeOwnershipPrivilege	3252	wmic.exe
Token: SeLoadDriverPrivilege	3252	wmic.exe
Token: SeSystemProfilePrivilege	3252	wmic.exe
Token: SeSystemtimePrivilege	3252	wmic.exe
Token: SeProfSingleProcessPrivilege	3252	wmic.exe
Token: SeIncBasePriorityPrivilege	3252	wmic.exe
Token: SeCreatePagefilePrivilege	3252	wmic.exe
Token: SeBackupPrivilege	3252	wmic.exe
Token: SeRestorePrivilege	3252	wmic.exe
Token: SeShutdownPrivilege	3252	wmic.exe
Token: SeDebugPrivilege	3252	wmic.exe
Token: SeSystemEnvironmentPrivilege	3252	wmic.exe
Token: SeRemoteShutdownPrivilege	3252	wmic.exe
Token: SeUndockPrivilege	3252	wmic.exe
Token: SeManageVolumePrivilege	3252	wmic.exe
Token: 33	3252	wmic.exe
Token: 34	3252	wmic.exe
Token: 35	3252	wmic.exe
Token: 36	3252	wmic.exe
Token: SeIncreaseQuotaPrivilege	3252	wmic.exe
Token: SeSecurityPrivilege	3252	wmic.exe
Token: SeTakeOwnershipPrivilege	3252	wmic.exe
Token: SeLoadDriverPrivilege	3252	wmic.exe
Token: SeSystemProfilePrivilege	3252	wmic.exe
Token: SeSystemtimePrivilege	3252	wmic.exe
Token: SeProfSingleProcessPrivilege	3252	wmic.exe
Token: SeIncBasePriorityPrivilege	3252	wmic.exe
Token: SeCreatePagefilePrivilege	3252	wmic.exe
Token: SeBackupPrivilege	3252	wmic.exe
Token: SeRestorePrivilege	3252	wmic.exe
Token: SeShutdownPrivilege	3252	wmic.exe
Token: SeDebugPrivilege	3252	wmic.exe
Token: SeSystemEnvironmentPrivilege	3252	wmic.exe
Token: SeRemoteShutdownPrivilege	3252	wmic.exe
Token: SeUndockPrivilege	3252	wmic.exe
Token: SeManageVolumePrivilege	3252	wmic.exe
Token: 33	3252	wmic.exe
Token: 34	3252	wmic.exe
Token: 35	3252	wmic.exe
Token: 36	3252	wmic.exe
Token: SeDebugPrivilege	1412	powershell.exe
Token: SeDebugPrivilege	4536	powershell.exe
Token: SeDebugPrivilege	640	powershell.exe
Token: SeDebugPrivilege	676	powershell.exe
Token: SeIncreaseQuotaPrivilege	4700	wmic.exe
Token: SeSecurityPrivilege	4700	wmic.exe
Token: SeTakeOwnershipPrivilege	4700	wmic.exe
Token: SeLoadDriverPrivilege	4700	wmic.exe
Token: SeSystemProfilePrivilege	4700	wmic.exe
Token: SeSystemtimePrivilege	4700	wmic.exe
Token: SeProfSingleProcessPrivilege	4700	wmic.exe
Token: SeIncBasePriorityPrivilege	4700	wmic.exe
Token: SeCreatePagefilePrivilege	4700	wmic.exe
Token: SeBackupPrivilege	4700	wmic.exe
Token: SeRestorePrivilege	4700	wmic.exe
Token: SeShutdownPrivilege	4700	wmic.exe
Token: SeDebugPrivilege	4700	wmic.exe
Token: SeSystemEnvironmentPrivilege	4700	wmic.exe
Token: SeRemoteShutdownPrivilege	4700	wmic.exe
Token: SeUndockPrivilege	4700	wmic.exe
Token: SeManageVolumePrivilege	4700	wmic.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 4788 wrote to memory of 3252	4788	Umbral.exe	86
PID 4788 wrote to memory of 3252	4788	Umbral.exe	86
PID 4788 wrote to memory of 3004	4788	Umbral.exe	89
PID 4788 wrote to memory of 3004	4788	Umbral.exe	89
PID 4788 wrote to memory of 1412	4788	Umbral.exe	91
PID 4788 wrote to memory of 1412	4788	Umbral.exe	91
PID 4788 wrote to memory of 4536	4788	Umbral.exe	97
PID 4788 wrote to memory of 4536	4788	Umbral.exe	97
PID 4788 wrote to memory of 640	4788	Umbral.exe	100
PID 4788 wrote to memory of 640	4788	Umbral.exe	100
PID 4788 wrote to memory of 676	4788	Umbral.exe	102
PID 4788 wrote to memory of 676	4788	Umbral.exe	102
PID 4788 wrote to memory of 4700	4788	Umbral.exe	106
PID 4788 wrote to memory of 4700	4788	Umbral.exe	106
PID 4788 wrote to memory of 3036	4788	Umbral.exe	108
PID 4788 wrote to memory of 3036	4788	Umbral.exe	108
PID 4788 wrote to memory of 2252	4788	Umbral.exe	110
PID 4788 wrote to memory of 2252	4788	Umbral.exe	110
PID 4788 wrote to memory of 1592	4788	Umbral.exe	112
PID 4788 wrote to memory of 1592	4788	Umbral.exe	112
PID 4788 wrote to memory of 216	4788	Umbral.exe	115
PID 4788 wrote to memory of 216	4788	Umbral.exe	115
PID 4788 wrote to memory of 920	4788	Umbral.exe	117
PID 4788 wrote to memory of 920	4788	Umbral.exe	117
PID 920 wrote to memory of 764	920	cmd.exe	119
PID 920 wrote to memory of 764	920	cmd.exe	119

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
3004	attrib.exe

C:\Users\Admin\AppData\Local\Temp\Umbral.exe
"C:\Users\Admin\AppData\Local\Temp\Umbral.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4788
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3252
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\Umbral.exe"
  2⤵
  - Views/modifies file attributes
  PID:3004
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Umbral.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1412
- 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:4536
- 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:640
- 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:676
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4700
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:3036
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:2252
- 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:1592
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:216
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\Umbral.exe" && pause
  2⤵
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:920
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:764

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\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
2e907f77659a6601fcc408274894da2e

SHA1
9f5b72abef1cd7145bf37547cdb1b9254b4efe9d

SHA256
385da35673330e21ac02545220552fe301fe54dedefbdafc097ac4342a295233

SHA512
34fa0fff24f6550f55f828541aaefe5d75c86f8f0842d54b50065e9746f9662bb7209c74c9a9571540b9855bb3851f01db613190024e89b198d485bb5dc07721

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

Filesize
948B

MD5
c523adc639d16ffb0f96cebc63eed858

SHA1
12ff3728fe7a266d00bea61357e168d1ac35fb8b

SHA256
3f3c9377b171cf14fcf2bfe2ef6ab7753c1470c8fe803fb73317fa3732c55df1

SHA512
36dd1d5df9f67a708087ae024f4088fbe6ed11859c65c896f4c7b40631e418646295078abe0bd1e7062b3dd5f333d8cf86a8542ef719e4b14feec877c60839ba

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

Filesize
1KB

MD5
e0ec6bf376a6b15852bce768196c5ed0

SHA1
05fe4e592ebbb7e29f36b8d30a6a90ba29bd4f81

SHA256
2d4a39cbbd597a7cfff477817c3c7c541c14974c8d234b4c0de6d229e3a3ce97

SHA512
dc0c7d3d127c88affea9ae402d7358c079cfa7fc3ecb417085e31dc749da1406e72563bfbe42167fdad57e10aa0c6cca7a8ba06921b3a1212ad7ccee1a0f859b

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

Filesize
1KB

MD5
8db9c39f7c3d1b4a53b68c2d16e7c044

SHA1
e719df2fe37682d5ebd4b1e4a1ea45f502dc716b

SHA256
0c4ed7f771336125f93ed80646d8de8dce62652e8ac6f68e204dcfd1f521cec6

SHA512
3a919a6cd6b32d88277941fda9baf84c9c75bbafc5d4fde89d45b6688547e3042bfeba94845be3aae7b2a00ad3d24c7561b48f335292ec47485fb16f6a8fb7f0

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ibl5axo1.xxs.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1412-10-0x000001969D780000-0x000001969D7A2000-memory.dmp

Filesize
136KB

Download
memory/1412-14-0x00007FFF30CC0000-0x00007FFF31781000-memory.dmp

Filesize
10.8MB

Download
memory/1412-15-0x00007FFF30CC0000-0x00007FFF31781000-memory.dmp

Filesize
10.8MB

Download
memory/1412-18-0x00007FFF30CC0000-0x00007FFF31781000-memory.dmp

Filesize
10.8MB

Download
memory/1412-3-0x00007FFF30CC0000-0x00007FFF31781000-memory.dmp

Filesize
10.8MB

Download
memory/4788-33-0x000001A6BFE20000-0x000001A6BFE70000-memory.dmp

Filesize
320KB

Download
memory/4788-32-0x000001A6D8640000-0x000001A6D86B6000-memory.dmp

Filesize
472KB

Download
memory/4788-34-0x000001A6BFE00000-0x000001A6BFE1E000-memory.dmp

Filesize
120KB

Download
memory/4788-1-0x000001A6BDF10000-0x000001A6BDF50000-memory.dmp

Filesize
256KB

Download
memory/4788-0-0x00007FFF30CC3000-0x00007FFF30CC5000-memory.dmp

Filesize
8KB

Download
memory/4788-70-0x000001A6D8710000-0x000001A6D871A000-memory.dmp

Filesize
40KB

Download
memory/4788-71-0x000001A6D8740000-0x000001A6D8752000-memory.dmp

Filesize
72KB

Download
memory/4788-2-0x00007FFF30CC0000-0x00007FFF31781000-memory.dmp

Filesize
10.8MB

Download
memory/4788-89-0x00007FFF30CC0000-0x00007FFF31781000-memory.dmp

Filesize
10.8MB

Download