umbral | 68ea23c1515b2306e607ce7b124f9314b4af9ee2572e23550b3ac1a8dd3b43e6

Analysis

max time kernel
120s
max time network
124s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
15-11-2024 10:02

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General

Target

Kraxx-Builder/Kraxx-OS-Builder/Kraxx-Builder.exe
Size

229KB
MD5

1c615c8e4fc8fbbf2519a03471cdac01
SHA1

5388ec05cbe0f0928ae7f9be41ed99a5a5607d05
SHA256

035d79db8e3afcf56dfc240fb3df650409d78ae18d7f7eafdf00d38a5c520fa3
SHA512

3c624edec97f885aaf06ffa5d0628e453fcb76066524ac7316dbcf85f20ab4605616234b6348c3cad17d8057a6db7ae0b16f8bf44a950326244a98bd1b615ce2
SSDEEP

6144:tloZMHrIkd8g+EtXHkv/iD48enthv0IH22PxM4daSb8e1m79Ri:voZIL+EP88enthv0IH22PxM4dtYI

Score

10^/10

umbral execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral5/memory/2336-1-0x00000000012B0000-0x00000000012F0000-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
2700	powershell.exe
2524	powershell.exe
1020	powershell.exe
1284	powershell.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
8	discord.com
9	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
6	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
1700	wmic.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
2700	powershell.exe
2524	powershell.exe
1020	powershell.exe
2504	powershell.exe
1284	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2336	Kraxx-Builder.exe
Token: SeDebugPrivilege	2700	powershell.exe
Token: SeDebugPrivilege	2524	powershell.exe
Token: SeDebugPrivilege	1020	powershell.exe
Token: SeDebugPrivilege	2504	powershell.exe
Token: SeIncreaseQuotaPrivilege	1732	wmic.exe
Token: SeSecurityPrivilege	1732	wmic.exe
Token: SeTakeOwnershipPrivilege	1732	wmic.exe
Token: SeLoadDriverPrivilege	1732	wmic.exe
Token: SeSystemProfilePrivilege	1732	wmic.exe
Token: SeSystemtimePrivilege	1732	wmic.exe
Token: SeProfSingleProcessPrivilege	1732	wmic.exe
Token: SeIncBasePriorityPrivilege	1732	wmic.exe
Token: SeCreatePagefilePrivilege	1732	wmic.exe
Token: SeBackupPrivilege	1732	wmic.exe
Token: SeRestorePrivilege	1732	wmic.exe
Token: SeShutdownPrivilege	1732	wmic.exe
Token: SeDebugPrivilege	1732	wmic.exe
Token: SeSystemEnvironmentPrivilege	1732	wmic.exe
Token: SeRemoteShutdownPrivilege	1732	wmic.exe
Token: SeUndockPrivilege	1732	wmic.exe
Token: SeManageVolumePrivilege	1732	wmic.exe
Token: 33	1732	wmic.exe
Token: 34	1732	wmic.exe
Token: 35	1732	wmic.exe
Token: SeIncreaseQuotaPrivilege	1732	wmic.exe
Token: SeSecurityPrivilege	1732	wmic.exe
Token: SeTakeOwnershipPrivilege	1732	wmic.exe
Token: SeLoadDriverPrivilege	1732	wmic.exe
Token: SeSystemProfilePrivilege	1732	wmic.exe
Token: SeSystemtimePrivilege	1732	wmic.exe
Token: SeProfSingleProcessPrivilege	1732	wmic.exe
Token: SeIncBasePriorityPrivilege	1732	wmic.exe
Token: SeCreatePagefilePrivilege	1732	wmic.exe
Token: SeBackupPrivilege	1732	wmic.exe
Token: SeRestorePrivilege	1732	wmic.exe
Token: SeShutdownPrivilege	1732	wmic.exe
Token: SeDebugPrivilege	1732	wmic.exe
Token: SeSystemEnvironmentPrivilege	1732	wmic.exe
Token: SeRemoteShutdownPrivilege	1732	wmic.exe
Token: SeUndockPrivilege	1732	wmic.exe
Token: SeManageVolumePrivilege	1732	wmic.exe
Token: 33	1732	wmic.exe
Token: 34	1732	wmic.exe
Token: 35	1732	wmic.exe
Token: SeIncreaseQuotaPrivilege	2464	wmic.exe
Token: SeSecurityPrivilege	2464	wmic.exe
Token: SeTakeOwnershipPrivilege	2464	wmic.exe
Token: SeLoadDriverPrivilege	2464	wmic.exe
Token: SeSystemProfilePrivilege	2464	wmic.exe
Token: SeSystemtimePrivilege	2464	wmic.exe
Token: SeProfSingleProcessPrivilege	2464	wmic.exe
Token: SeIncBasePriorityPrivilege	2464	wmic.exe
Token: SeCreatePagefilePrivilege	2464	wmic.exe
Token: SeBackupPrivilege	2464	wmic.exe
Token: SeRestorePrivilege	2464	wmic.exe
Token: SeShutdownPrivilege	2464	wmic.exe
Token: SeDebugPrivilege	2464	wmic.exe
Token: SeSystemEnvironmentPrivilege	2464	wmic.exe
Token: SeRemoteShutdownPrivilege	2464	wmic.exe
Token: SeUndockPrivilege	2464	wmic.exe
Token: SeManageVolumePrivilege	2464	wmic.exe
Token: 33	2464	wmic.exe
Token: 34	2464	wmic.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 2336 wrote to memory of 2700	2336	Kraxx-Builder.exe	30
PID 2336 wrote to memory of 2700	2336	Kraxx-Builder.exe	30
PID 2336 wrote to memory of 2700	2336	Kraxx-Builder.exe	30
PID 2336 wrote to memory of 2524	2336	Kraxx-Builder.exe	32
PID 2336 wrote to memory of 2524	2336	Kraxx-Builder.exe	32
PID 2336 wrote to memory of 2524	2336	Kraxx-Builder.exe	32
PID 2336 wrote to memory of 1020	2336	Kraxx-Builder.exe	34
PID 2336 wrote to memory of 1020	2336	Kraxx-Builder.exe	34
PID 2336 wrote to memory of 1020	2336	Kraxx-Builder.exe	34
PID 2336 wrote to memory of 2504	2336	Kraxx-Builder.exe	36
PID 2336 wrote to memory of 2504	2336	Kraxx-Builder.exe	36
PID 2336 wrote to memory of 2504	2336	Kraxx-Builder.exe	36
PID 2336 wrote to memory of 1732	2336	Kraxx-Builder.exe	38
PID 2336 wrote to memory of 1732	2336	Kraxx-Builder.exe	38
PID 2336 wrote to memory of 1732	2336	Kraxx-Builder.exe	38
PID 2336 wrote to memory of 2464	2336	Kraxx-Builder.exe	41
PID 2336 wrote to memory of 2464	2336	Kraxx-Builder.exe	41
PID 2336 wrote to memory of 2464	2336	Kraxx-Builder.exe	41
PID 2336 wrote to memory of 1760	2336	Kraxx-Builder.exe	43
PID 2336 wrote to memory of 1760	2336	Kraxx-Builder.exe	43
PID 2336 wrote to memory of 1760	2336	Kraxx-Builder.exe	43
PID 2336 wrote to memory of 1284	2336	Kraxx-Builder.exe	45
PID 2336 wrote to memory of 1284	2336	Kraxx-Builder.exe	45
PID 2336 wrote to memory of 1284	2336	Kraxx-Builder.exe	45
PID 2336 wrote to memory of 1700	2336	Kraxx-Builder.exe	47
PID 2336 wrote to memory of 1700	2336	Kraxx-Builder.exe	47
PID 2336 wrote to memory of 1700	2336	Kraxx-Builder.exe	47

C:\Users\Admin\AppData\Local\Temp\Kraxx-Builder\Kraxx-OS-Builder\Kraxx-Builder.exe
"C:\Users\Admin\AppData\Local\Temp\Kraxx-Builder\Kraxx-OS-Builder\Kraxx-Builder.exe"
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2336
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Kraxx-Builder\Kraxx-OS-Builder\Kraxx-Builder.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2700
- 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:2524
- 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:1020
- 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:2504
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1732
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2464
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1760
- 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:1284
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:1700

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

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

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\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
de56b0ec4998ab7de5ff39b58bc7e6c0

SHA1
8c3aa3408b73f4eeef155acb4e58e3c1894a2bcc

SHA256
6e9460f72d854fbd466ad749a10ee1082c6402ae0ad1015151a38339b8cbfbd5

SHA512
0340fb95bf9b2316fa1c5c7cf22739a6c6468d8b012f70633107b046fc1b7a780799a70e96d649da8ac737ff8ae161c84642877e7170a1e9cf3296797e17b5b1

Download Submit
memory/1284-50-0x000000001B5F0000-0x000000001B8D2000-memory.dmp

Filesize
2.9MB

Download
memory/2336-1-0x00000000012B0000-0x00000000012F0000-memory.dmp

Filesize
256KB

Download
memory/2336-0-0x000007FEF62E3000-0x000007FEF62E4000-memory.dmp

Filesize
4KB

Download
memory/2336-54-0x000007FEF62E0000-0x000007FEF6CCC000-memory.dmp

Filesize
9.9MB

Download
memory/2336-2-0x000007FEF62E0000-0x000007FEF6CCC000-memory.dmp

Filesize
9.9MB

Download
memory/2336-35-0x000007FEF62E0000-0x000007FEF6CCC000-memory.dmp

Filesize
9.9MB

Download
memory/2336-34-0x000007FEF62E3000-0x000007FEF62E4000-memory.dmp

Filesize
4KB

Download
memory/2524-21-0x0000000001E70000-0x0000000001E78000-memory.dmp

Filesize
32KB

Download
memory/2524-20-0x000000001B7B0000-0x000000001BA92000-memory.dmp

Filesize
2.9MB

Download
memory/2700-11-0x000007FEEDC90000-0x000007FEEE62D000-memory.dmp

Filesize
9.6MB

Download
memory/2700-14-0x000007FEEDC90000-0x000007FEEE62D000-memory.dmp

Filesize
9.6MB

Download
memory/2700-13-0x000007FEEDC90000-0x000007FEEE62D000-memory.dmp

Filesize
9.6MB

Download
memory/2700-8-0x000007FEEDC90000-0x000007FEEE62D000-memory.dmp

Filesize
9.6MB

Download
memory/2700-9-0x000000001B530000-0x000000001B812000-memory.dmp

Filesize
2.9MB

Download
memory/2700-10-0x00000000028E0000-0x00000000028E8000-memory.dmp

Filesize
32KB

Download
memory/2700-12-0x000007FEEDC90000-0x000007FEEE62D000-memory.dmp

Filesize
9.6MB

Download
memory/2700-7-0x000007FEEDF4E000-0x000007FEEDF4F000-memory.dmp

Filesize
4KB

Download