umbral | e22bde6d04787794012e7e12ceaf1cf8fdf145f81551d90febf6a4f9c5d4e029

Resubmissions

02-11-2024 20:47

241102-zk65faxqfq 10

02-11-2024 20:43

241102-zhqpnsvemg 10

Analysis

max time kernel
141s
max time network
153s
platform
windows11-21h2_x64
resource
win11-20241023-en
resource tags

arch:x64arch:x86image:win11-20241023-enlocale:en-usos:windows11-21h2-x64system
submitted
02-11-2024 20:43

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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

Processes:

resource	yara_rule
behavioral1/memory/4684-1-0x0000019B7A310000-0x0000019B7A350000-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

Processes:

powershell.exepowershell.exepowershell.exepowershell.exe

pid process

2140 powershell.exe
988 powershell.exe
4676 powershell.exe
3476 powershell.exe
Drops file in Drivers directory 1 IoCs

Processes:

GTAGLoader.exe

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

Processes:

flow ioc

3 discord.com
5 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.

Processes:

flow ioc

3 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

Processes:

PING.EXEcmd.exe

pid process

816 PING.EXE
3060 cmd.exe
Detects videocard installed 1 TTPs 1 IoCs
Uses WMIC.exe to determine videocard installed.

System Information Discovery
T1082

Processes:

wmic.exe

pid process

384 wmic.exe
Modifies registry class 1 IoCs

Processes:

MiniSearchHost.exe

description ioc process

Key created \REGISTRY\USER\S-1-5-21-4248760313-3670024077-2384670640-1000_Classes\Local Settings\MuiCache MiniSearchHost.exe
Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery
T1018

Processes:

PING.EXE

pid process

816 PING.EXE

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

flow	ioc
3	discord.com
5	discord.com

flow	ioc
3	ip-api.com

pid	process
816	PING.EXE
3060	cmd.exe

pid	process
384	wmic.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-4248760313-3670024077-2384670640-1000_Classes\Local Settings\MuiCache	MiniSearchHost.exe

pid	process
816	PING.EXE

Suspicious behavior: EnumeratesProcesses 10 IoCs

Processes:

powershell.exepowershell.exepowershell.exepowershell.exepowershell.exe

pid	process
2140	powershell.exe
2140	powershell.exe
3476	powershell.exe
3476	powershell.exe
988	powershell.exe
988	powershell.exe
304	powershell.exe
304	powershell.exe
4676	powershell.exe
4676	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

Processes:

GTAGLoader.exepowershell.exepowershell.exepowershell.exepowershell.exewmic.exewmic.exe

description	pid	process
Token: SeDebugPrivilege	4684	GTAGLoader.exe
Token: SeDebugPrivilege	2140	powershell.exe
Token: SeDebugPrivilege	3476	powershell.exe
Token: SeDebugPrivilege	988	powershell.exe
Token: SeDebugPrivilege	304	powershell.exe
Token: SeIncreaseQuotaPrivilege	1352	wmic.exe
Token: SeSecurityPrivilege	1352	wmic.exe
Token: SeTakeOwnershipPrivilege	1352	wmic.exe
Token: SeLoadDriverPrivilege	1352	wmic.exe
Token: SeSystemProfilePrivilege	1352	wmic.exe
Token: SeSystemtimePrivilege	1352	wmic.exe
Token: SeProfSingleProcessPrivilege	1352	wmic.exe
Token: SeIncBasePriorityPrivilege	1352	wmic.exe
Token: SeCreatePagefilePrivilege	1352	wmic.exe
Token: SeBackupPrivilege	1352	wmic.exe
Token: SeRestorePrivilege	1352	wmic.exe
Token: SeShutdownPrivilege	1352	wmic.exe
Token: SeDebugPrivilege	1352	wmic.exe
Token: SeSystemEnvironmentPrivilege	1352	wmic.exe
Token: SeRemoteShutdownPrivilege	1352	wmic.exe
Token: SeUndockPrivilege	1352	wmic.exe
Token: SeManageVolumePrivilege	1352	wmic.exe
Token: 33	1352	wmic.exe
Token: 34	1352	wmic.exe
Token: 35	1352	wmic.exe
Token: 36	1352	wmic.exe
Token: SeIncreaseQuotaPrivilege	1352	wmic.exe
Token: SeSecurityPrivilege	1352	wmic.exe
Token: SeTakeOwnershipPrivilege	1352	wmic.exe
Token: SeLoadDriverPrivilege	1352	wmic.exe
Token: SeSystemProfilePrivilege	1352	wmic.exe
Token: SeSystemtimePrivilege	1352	wmic.exe
Token: SeProfSingleProcessPrivilege	1352	wmic.exe
Token: SeIncBasePriorityPrivilege	1352	wmic.exe
Token: SeCreatePagefilePrivilege	1352	wmic.exe
Token: SeBackupPrivilege	1352	wmic.exe
Token: SeRestorePrivilege	1352	wmic.exe
Token: SeShutdownPrivilege	1352	wmic.exe
Token: SeDebugPrivilege	1352	wmic.exe
Token: SeSystemEnvironmentPrivilege	1352	wmic.exe
Token: SeRemoteShutdownPrivilege	1352	wmic.exe
Token: SeUndockPrivilege	1352	wmic.exe
Token: SeManageVolumePrivilege	1352	wmic.exe
Token: 33	1352	wmic.exe
Token: 34	1352	wmic.exe
Token: 35	1352	wmic.exe
Token: 36	1352	wmic.exe
Token: SeIncreaseQuotaPrivilege	1216	wmic.exe
Token: SeSecurityPrivilege	1216	wmic.exe
Token: SeTakeOwnershipPrivilege	1216	wmic.exe
Token: SeLoadDriverPrivilege	1216	wmic.exe
Token: SeSystemProfilePrivilege	1216	wmic.exe
Token: SeSystemtimePrivilege	1216	wmic.exe
Token: SeProfSingleProcessPrivilege	1216	wmic.exe
Token: SeIncBasePriorityPrivilege	1216	wmic.exe
Token: SeCreatePagefilePrivilege	1216	wmic.exe
Token: SeBackupPrivilege	1216	wmic.exe
Token: SeRestorePrivilege	1216	wmic.exe
Token: SeShutdownPrivilege	1216	wmic.exe
Token: SeDebugPrivilege	1216	wmic.exe
Token: SeSystemEnvironmentPrivilege	1216	wmic.exe
Token: SeRemoteShutdownPrivilege	1216	wmic.exe
Token: SeUndockPrivilege	1216	wmic.exe
Token: SeManageVolumePrivilege	1216	wmic.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

MiniSearchHost.exe

pid process

4212 MiniSearchHost.exe

pid	process
4212	MiniSearchHost.exe

Suspicious use of WriteProcessMemory 24 IoCs

Processes:

GTAGLoader.execmd.exe

description	pid	process	target process
PID 4684 wrote to memory of 748	4684	GTAGLoader.exe	attrib.exe
PID 4684 wrote to memory of 748	4684	GTAGLoader.exe	attrib.exe
PID 4684 wrote to memory of 2140	4684	GTAGLoader.exe	powershell.exe
PID 4684 wrote to memory of 2140	4684	GTAGLoader.exe	powershell.exe
PID 4684 wrote to memory of 3476	4684	GTAGLoader.exe	powershell.exe
PID 4684 wrote to memory of 3476	4684	GTAGLoader.exe	powershell.exe
PID 4684 wrote to memory of 988	4684	GTAGLoader.exe	powershell.exe
PID 4684 wrote to memory of 988	4684	GTAGLoader.exe	powershell.exe
PID 4684 wrote to memory of 304	4684	GTAGLoader.exe	powershell.exe
PID 4684 wrote to memory of 304	4684	GTAGLoader.exe	powershell.exe
PID 4684 wrote to memory of 1352	4684	GTAGLoader.exe	wmic.exe
PID 4684 wrote to memory of 1352	4684	GTAGLoader.exe	wmic.exe
PID 4684 wrote to memory of 1216	4684	GTAGLoader.exe	wmic.exe
PID 4684 wrote to memory of 1216	4684	GTAGLoader.exe	wmic.exe
PID 4684 wrote to memory of 1324	4684	GTAGLoader.exe	wmic.exe
PID 4684 wrote to memory of 1324	4684	GTAGLoader.exe	wmic.exe
PID 4684 wrote to memory of 4676	4684	GTAGLoader.exe	powershell.exe
PID 4684 wrote to memory of 4676	4684	GTAGLoader.exe	powershell.exe
PID 4684 wrote to memory of 384	4684	GTAGLoader.exe	wmic.exe
PID 4684 wrote to memory of 384	4684	GTAGLoader.exe	wmic.exe
PID 4684 wrote to memory of 3060	4684	GTAGLoader.exe	cmd.exe
PID 4684 wrote to memory of 3060	4684	GTAGLoader.exe	cmd.exe
PID 3060 wrote to memory of 816	3060	cmd.exe	PING.EXE
PID 3060 wrote to memory of 816	3060	cmd.exe	PING.EXE

Views/modifies file attributes 1 TTPs 1 IoCs
evasion

Hidden Files and Directories
T1564.001

Processes:

attrib.exe

pid process

748 attrib.exe

pid	process
748	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:4684
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\GTAGLoader.exe"
  2⤵
  - Views/modifies file attributes
  PID:748
- 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:2140
- 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:3476
- 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:988
- 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:304
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1352
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1216
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1324
- 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:4676
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:384
- 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:3060
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:816

C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\MiniSearchHost.exe
"C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\MiniSearchHost.exe" -ServerName:MiniSearchUI.AppXj3y73at8fy1htwztzxs68sxx1v7cksp7.mca
1⤵
- Modifies registry class
- Suspicious use of SetWindowsHookEx
PID:4212

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\Desktop\UnprotectHide.cmd" "
1⤵
PID:700

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:2712

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
627073ee3ca9676911bee35548eff2b8

SHA1
4c4b68c65e2cab9864b51167d710aa29ebdcff2e

SHA256
85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

SHA512
3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

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

Filesize
944B

MD5
2e8eb51096d6f6781456fef7df731d97

SHA1
ec2aaf851a618fb43c3d040a13a71997c25bda43

SHA256
96bfd9dd5883329927fe8c08b8956355a1a6ceb30ceeb5d4252b346df32bc864

SHA512
0a73dc9a49f92d9dd556c2ca2e36761890b3538f355ee1f013e7cf648d8c4d065f28046cd4a167db3dea304d1fbcbcea68d11ce6e12a3f20f8b6c018a60422d2

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

Filesize
948B

MD5
29145a87544628ce56761358c4b41600

SHA1
34342de0f0083c72323e5c8cd85f53fe3bf22dcc

SHA256
243e604ed56f762301c6a894a399a2cb27a35e8bb5894c956392e6109d731356

SHA512
2850d64a10cb8f8f33030aaeb55a2a8b1e3771b0c95c7181a1e9a231934f509a30ce1383996b0d2ac6d734b7dbe62a99cad570937b05e0e6060d8be5daf52647

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

Filesize
1KB

MD5
7332074ae2b01262736b6fbd9e100dac

SHA1
22f992165065107cc9417fa4117240d84414a13c

SHA256
baea84fda6c1f13090b8cbd91c920848946f10ce155ef31a1df4cd453ee7e4aa

SHA512
4ae6f0e012c31ac1fc2ff4a8877ce2b4667c45b6e651de798318a39a2b6fd39a6f72dffa8b0b89b7a045a27d724d195656faa25a9fec79b22f37ddebb5d22da2

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

Filesize
1KB

MD5
b2f8b5bf54e10ae4d93a2eac002cb497

SHA1
eccc3cd33596075bf413e4249c1f2491b1b2a6c7

SHA256
44e6afcd4b56b7cbc81c4ce55e62b7ae6f8d44948f2b9cc9a6ee9a9adfdce02d

SHA512
58c5911a9b98b94909e627f498f839a55383aa213afd9a837ed1f8543198a79a856baa02373f948bfbb0cfd149e7962e2356cdad6695dc6411840faa09700686

Download Submit
C:\Users\Admin\AppData\Local\Packages\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\TempState\SearchHoverUnifiedTileModelCache.dat

Filesize
10KB

MD5
1301a13a0b62ba61652cdbf2d61f80fa

SHA1
1911d1f0d097e8f5275a29e17b0bcef305df1d9e

SHA256
7e75ad955706d05f5934810aebbd3b5a7742d5e5766efd9c4fc17ee492b2f716

SHA512
66aa4261628bb31ee416af70f4159c02e5bbfbe2f7645e87d70bb35b1f20fa915d62b25d99cd72c59580d1f64e6c6b5ad36ace6600d3bcdb67f45036d768ed8b

Download Submit
C:\Users\Admin\AppData\Local\Packages\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\TempState\~earchHoverUnifiedTileModelCache.tmp

Filesize
10KB

MD5
964219fcbf4c1e0008bc5e05686367a9

SHA1
685a0b860afbfd43305bc67763e41b296a22ba8b

SHA256
4f4388ce8c3055db4827ad4b6d7d6ffc7bead99955a3fbe44ab3a5454651ae25

SHA512
2745f64b2bd54740a5c1f754785c39eeda9b6b5112707cc8630ba188638442de7c636446f750aeb340905d9da26f96ee4e7f7c96e2b690058ce29d7b6efe8c16

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_cycwbftw.kd3.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2140-13-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

Filesize
10.8MB

Download
memory/2140-12-0x000001D7710C0000-0x000001D7710E2000-memory.dmp

Filesize
136KB

Download
memory/2140-19-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

Filesize
10.8MB

Download
memory/2140-15-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

Filesize
10.8MB

Download
memory/2140-14-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

Filesize
10.8MB

Download
memory/2140-16-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

Filesize
10.8MB

Download
memory/2140-3-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

Filesize
10.8MB

Download
memory/4684-33-0x0000019B7CAD0000-0x0000019B7CB46000-memory.dmp

Filesize
472KB

Download
memory/4684-0-0x00007FFFC1473000-0x00007FFFC1475000-memory.dmp

Filesize
8KB

Download
memory/4684-35-0x0000019B7CA50000-0x0000019B7CA6E000-memory.dmp

Filesize
120KB

Download
memory/4684-70-0x0000019B7CA90000-0x0000019B7CA9A000-memory.dmp

Filesize
40KB

Download
memory/4684-71-0x0000019B7CBA0000-0x0000019B7CBB2000-memory.dmp

Filesize
72KB

Download
memory/4684-34-0x0000019B7CB50000-0x0000019B7CBA0000-memory.dmp

Filesize
320KB

Download
memory/4684-86-0x00007FFFC1473000-0x00007FFFC1475000-memory.dmp

Filesize
8KB

Download
memory/4684-91-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

Filesize
10.8MB

Download
memory/4684-2-0x00007FFFC1470000-0x00007FFFC1F32000-memory.dmp

Filesize
10.8MB

Download
memory/4684-1-0x0000019B7A310000-0x0000019B7A350000-memory.dmp

Filesize
256KB

Download