umbral | e22bde6d04787794012e7e12ceaf1cf8fdf145f81551d90febf6a4f9c5d4e029

Resubmissions

02-11-2024 20:47

241102-zk65faxqfq 10

02-11-2024 20:43

241102-zhqpnsvemg 10

Analysis

max time kernel
100s
max time network
149s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-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
behavioral2/memory/1748-1-0x0000025DC96B0000-0x0000025DC96F0000-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
1440	powershell.exe
2192	powershell.exe
1672	powershell.exe
2380	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
22	discord.com
23	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
20	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
908	cmd.exe
1192	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
820	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1192	PING.EXE

Suspicious behavior: EnumeratesProcesses 26 IoCs

pid	Process
1440	powershell.exe
1440	powershell.exe
2192	powershell.exe
2192	powershell.exe
1672	powershell.exe
1672	powershell.exe
2120	powershell.exe
2120	powershell.exe
2668	wmic.exe
2668	wmic.exe
2668	wmic.exe
2668	wmic.exe
3844	wmic.exe
3844	wmic.exe
3844	wmic.exe
3844	wmic.exe
1036	wmic.exe
1036	wmic.exe
1036	wmic.exe
1036	wmic.exe
2380	powershell.exe
2380	powershell.exe
820	wmic.exe
820	wmic.exe
820	wmic.exe
820	wmic.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	1748	GTAGLoader.exe
Token: SeDebugPrivilege	1440	powershell.exe
Token: SeIncreaseQuotaPrivilege	1440	powershell.exe
Token: SeSecurityPrivilege	1440	powershell.exe
Token: SeTakeOwnershipPrivilege	1440	powershell.exe
Token: SeLoadDriverPrivilege	1440	powershell.exe
Token: SeSystemProfilePrivilege	1440	powershell.exe
Token: SeSystemtimePrivilege	1440	powershell.exe
Token: SeProfSingleProcessPrivilege	1440	powershell.exe
Token: SeIncBasePriorityPrivilege	1440	powershell.exe
Token: SeCreatePagefilePrivilege	1440	powershell.exe
Token: SeBackupPrivilege	1440	powershell.exe
Token: SeRestorePrivilege	1440	powershell.exe
Token: SeShutdownPrivilege	1440	powershell.exe
Token: SeDebugPrivilege	1440	powershell.exe
Token: SeSystemEnvironmentPrivilege	1440	powershell.exe
Token: SeRemoteShutdownPrivilege	1440	powershell.exe
Token: SeUndockPrivilege	1440	powershell.exe
Token: SeManageVolumePrivilege	1440	powershell.exe
Token: 33	1440	powershell.exe
Token: 34	1440	powershell.exe
Token: 35	1440	powershell.exe
Token: 36	1440	powershell.exe
Token: SeDebugPrivilege	2192	powershell.exe
Token: SeDebugPrivilege	1672	powershell.exe
Token: SeDebugPrivilege	2120	powershell.exe
Token: SeIncreaseQuotaPrivilege	2668	wmic.exe
Token: SeSecurityPrivilege	2668	wmic.exe
Token: SeTakeOwnershipPrivilege	2668	wmic.exe
Token: SeLoadDriverPrivilege	2668	wmic.exe
Token: SeSystemProfilePrivilege	2668	wmic.exe
Token: SeSystemtimePrivilege	2668	wmic.exe
Token: SeProfSingleProcessPrivilege	2668	wmic.exe
Token: SeIncBasePriorityPrivilege	2668	wmic.exe
Token: SeCreatePagefilePrivilege	2668	wmic.exe
Token: SeBackupPrivilege	2668	wmic.exe
Token: SeRestorePrivilege	2668	wmic.exe
Token: SeShutdownPrivilege	2668	wmic.exe
Token: SeDebugPrivilege	2668	wmic.exe
Token: SeSystemEnvironmentPrivilege	2668	wmic.exe
Token: SeRemoteShutdownPrivilege	2668	wmic.exe
Token: SeUndockPrivilege	2668	wmic.exe
Token: SeManageVolumePrivilege	2668	wmic.exe
Token: 33	2668	wmic.exe
Token: 34	2668	wmic.exe
Token: 35	2668	wmic.exe
Token: 36	2668	wmic.exe
Token: SeIncreaseQuotaPrivilege	2668	wmic.exe
Token: SeSecurityPrivilege	2668	wmic.exe
Token: SeTakeOwnershipPrivilege	2668	wmic.exe
Token: SeLoadDriverPrivilege	2668	wmic.exe
Token: SeSystemProfilePrivilege	2668	wmic.exe
Token: SeSystemtimePrivilege	2668	wmic.exe
Token: SeProfSingleProcessPrivilege	2668	wmic.exe
Token: SeIncBasePriorityPrivilege	2668	wmic.exe
Token: SeCreatePagefilePrivilege	2668	wmic.exe
Token: SeBackupPrivilege	2668	wmic.exe
Token: SeRestorePrivilege	2668	wmic.exe
Token: SeShutdownPrivilege	2668	wmic.exe
Token: SeDebugPrivilege	2668	wmic.exe
Token: SeSystemEnvironmentPrivilege	2668	wmic.exe
Token: SeRemoteShutdownPrivilege	2668	wmic.exe
Token: SeUndockPrivilege	2668	wmic.exe
Token: SeManageVolumePrivilege	2668	wmic.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 1748 wrote to memory of 2976	1748	GTAGLoader.exe	81
PID 1748 wrote to memory of 2976	1748	GTAGLoader.exe	81
PID 1748 wrote to memory of 1440	1748	GTAGLoader.exe	84
PID 1748 wrote to memory of 1440	1748	GTAGLoader.exe	84
PID 1748 wrote to memory of 2192	1748	GTAGLoader.exe	87
PID 1748 wrote to memory of 2192	1748	GTAGLoader.exe	87
PID 1748 wrote to memory of 1672	1748	GTAGLoader.exe	89
PID 1748 wrote to memory of 1672	1748	GTAGLoader.exe	89
PID 1748 wrote to memory of 2120	1748	GTAGLoader.exe	91
PID 1748 wrote to memory of 2120	1748	GTAGLoader.exe	91
PID 1748 wrote to memory of 2668	1748	GTAGLoader.exe	93
PID 1748 wrote to memory of 2668	1748	GTAGLoader.exe	93
PID 1748 wrote to memory of 3844	1748	GTAGLoader.exe	98
PID 1748 wrote to memory of 3844	1748	GTAGLoader.exe	98
PID 1748 wrote to memory of 1036	1748	GTAGLoader.exe	100
PID 1748 wrote to memory of 1036	1748	GTAGLoader.exe	100
PID 1748 wrote to memory of 2380	1748	GTAGLoader.exe	103
PID 1748 wrote to memory of 2380	1748	GTAGLoader.exe	103
PID 1748 wrote to memory of 820	1748	GTAGLoader.exe	105
PID 1748 wrote to memory of 820	1748	GTAGLoader.exe	105
PID 1748 wrote to memory of 908	1748	GTAGLoader.exe	107
PID 1748 wrote to memory of 908	1748	GTAGLoader.exe	107
PID 908 wrote to memory of 1192	908	cmd.exe	109
PID 908 wrote to memory of 1192	908	cmd.exe	109

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2976	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:1748
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\GTAGLoader.exe"
  2⤵
  - Views/modifies file attributes
  PID:2976
- 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:1440
- 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:2192
- 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:1672
- 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:2120
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2668
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:3844
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:1036
- 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:2380
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  - Suspicious behavior: EnumeratesProcesses
  PID:820
- 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:908
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:1192

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
3KB

MD5
3eb3833f769dd890afc295b977eab4b4

SHA1
e857649b037939602c72ad003e5d3698695f436f

SHA256
c485a6e2fd17c342fca60060f47d6a5655a65a412e35e001bb5bf88d96e6e485

SHA512
c24bbc8f278478d43756807b8c584d4e3fb2289db468bc92986a489f74a8da386a667a758360a397e77e018e363be8912ac260072fa3e31117ad0599ac749e72

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

Filesize
1KB

MD5
6a807b1c91ac66f33f88a787d64904c1

SHA1
83c554c7de04a8115c9005709e5cd01fca82c5d3

SHA256
155314c1c86d8d4e5b802f1eef603c5dd4a2f7c949f069a38af5ba4959bd8256

SHA512
29f2d9f30fc081e7fe6e9fb772c810c9be0422afdc6aff5a286f49a990ededebcf0d083798c2d9f41ad8434393c6d0f5fa6df31226d9c3511ba2a41eb4a65200

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

Filesize
948B

MD5
84f977303c3e41c187944182c59f9e1a

SHA1
bfa6a10cbf2dfc418b5bc03c3c8e7968d28cf145

SHA256
873a2a2e155d0d13e2aac7091298cc21cdfa0b646792e03af792e26539edd2cf

SHA512
5678c96497cdc4a0691243b09a5bedd3979e5323dab0cc08118e2992f3eb57c06a17231f131c372d3429ad2de115854cf08e33c3170803f11ec02350c4106596

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

Filesize
1KB

MD5
8e1fdd1b66d2fee9f6a052524d4ddca5

SHA1
0a9d0994559d1be2eecd8b0d6960540ca627bdb6

SHA256
4cc7c1b79d1b48582d4dc27ca8c31457b9bf2441deb7914399bb9e6863f18b13

SHA512
5a5494b878b08e8515811ab7a3d68780dac7423f5562477d98249a8bedf7ec98567b7cd5d4c6967d6bc63f2d6d9b7da9a65e0eb29d4b955026b469b5b598d1f3

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

Filesize
1KB

MD5
876febf24f7121997c91ff27fe1243f0

SHA1
d64b8df55e23b3d9e893a5def6506d464e7a2686

SHA256
dd376e9b33fb0bad4a35ef76c52cab42f2a34f3db9aa1a48b934579f9810923e

SHA512
06145c3e3639697ef0303682390fdb3c51b9e60fb3e69c135dfe352a9b4961fd2c0416f030bd2b6952b06067997bc8dfa4319784bff32b9aef596fa06dd9820e

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_4v502zkz.lea.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1440-20-0x00007FF895BC0000-0x00007FF896682000-memory.dmp

Filesize
10.8MB

Download
memory/1440-15-0x00007FF895BC0000-0x00007FF896682000-memory.dmp

Filesize
10.8MB

Download
memory/1440-16-0x00007FF895BC0000-0x00007FF896682000-memory.dmp

Filesize
10.8MB

Download
memory/1440-19-0x00007FF895BC0000-0x00007FF896682000-memory.dmp

Filesize
10.8MB

Download
memory/1440-12-0x000001D086020000-0x000001D086042000-memory.dmp

Filesize
136KB

Download
memory/1440-14-0x00007FF895BC0000-0x00007FF896682000-memory.dmp

Filesize
10.8MB

Download
memory/1440-13-0x00007FF895BC0000-0x00007FF896682000-memory.dmp

Filesize
10.8MB

Download
memory/1748-36-0x0000025DCB440000-0x0000025DCB45E000-memory.dmp

Filesize
120KB

Download
memory/1748-35-0x0000025DE3E90000-0x0000025DE3EE0000-memory.dmp

Filesize
320KB

Download
memory/1748-34-0x0000025DE3CF0000-0x0000025DE3D66000-memory.dmp

Filesize
472KB

Download
memory/1748-0-0x00007FF895BC3000-0x00007FF895BC5000-memory.dmp

Filesize
8KB

Download
memory/1748-2-0x00007FF895BC0000-0x00007FF896682000-memory.dmp

Filesize
10.8MB

Download
memory/1748-61-0x0000025DCB470000-0x0000025DCB47A000-memory.dmp

Filesize
40KB

Download
memory/1748-62-0x0000025DCB4A0000-0x0000025DCB4B2000-memory.dmp

Filesize
72KB

Download
memory/1748-66-0x00007FF895BC0000-0x00007FF896682000-memory.dmp

Filesize
10.8MB

Download
memory/1748-1-0x0000025DC96B0000-0x0000025DC96F0000-memory.dmp

Filesize
256KB

Download
memory/1748-83-0x00007FF895BC0000-0x00007FF896682000-memory.dmp

Filesize
10.8MB

Download