umbral | 68ea23c1515b2306e607ce7b124f9314b4af9ee2572e23550b3ac1a8dd3b43e6

Analysis

max time kernel
117s
max time network
119s
platform
windows7_x64
resource
win7-20240708-en
resource tags

arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
submitted
15-11-2024 10:02

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General

Target

KraxxStealer-main.zip
Size

1.2MB
MD5

73222b81f9ef5fc735a5d905a305b22d
SHA1

33135b6ca277c58df56aa490b60383c431905fa0
SHA256

68ea23c1515b2306e607ce7b124f9314b4af9ee2572e23550b3ac1a8dd3b43e6
SHA512

ae927b2882ea7244b6813534916769664cdd41d11e21b667e5b52d6194972418ff418db5e1882eb7ea47a0fb6e8ac94a773bf105e32e0d868e79b2d641b267c7
SSDEEP

24576:U1D05gOqzT1PnVlUP8TBRRtzsmE6fwdQtbF/HfKlrtE8DGuVEEv1/P:15+T17q83HzsmEqtb1KBtEqGeEEv1/P

Score

10^/10

umbral execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 2 IoCs

resource	yara_rule
behavioral1/files/0x0009000000016cc4-4.dat	family_umbral
behavioral1/memory/1304-11-0x00000000000F0000-0x0000000000130000-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
2536	powershell.exe
2668	powershell.exe
2224	powershell.exe
1948	powershell.exe

Executes dropped EXE 1 IoCs

pid	Process
1304	Kraxx-Builder.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
1712	wmic.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2536	powershell.exe
2668	powershell.exe
2224	powershell.exe
2788	powershell.exe
1948	powershell.exe
2404	7zFM.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2404	7zFM.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeRestorePrivilege	2404	7zFM.exe
Token: 35	2404	7zFM.exe
Token: SeSecurityPrivilege	2404	7zFM.exe
Token: SeSecurityPrivilege	2404	7zFM.exe
Token: SeDebugPrivilege	1304	Kraxx-Builder.exe
Token: SeDebugPrivilege	2536	powershell.exe
Token: SeDebugPrivilege	2668	powershell.exe
Token: SeDebugPrivilege	2224	powershell.exe
Token: SeDebugPrivilege	2788	powershell.exe
Token: SeIncreaseQuotaPrivilege	2000	wmic.exe
Token: SeSecurityPrivilege	2000	wmic.exe
Token: SeTakeOwnershipPrivilege	2000	wmic.exe
Token: SeLoadDriverPrivilege	2000	wmic.exe
Token: SeSystemProfilePrivilege	2000	wmic.exe
Token: SeSystemtimePrivilege	2000	wmic.exe
Token: SeProfSingleProcessPrivilege	2000	wmic.exe
Token: SeIncBasePriorityPrivilege	2000	wmic.exe
Token: SeCreatePagefilePrivilege	2000	wmic.exe
Token: SeBackupPrivilege	2000	wmic.exe
Token: SeRestorePrivilege	2000	wmic.exe
Token: SeShutdownPrivilege	2000	wmic.exe
Token: SeDebugPrivilege	2000	wmic.exe
Token: SeSystemEnvironmentPrivilege	2000	wmic.exe
Token: SeRemoteShutdownPrivilege	2000	wmic.exe
Token: SeUndockPrivilege	2000	wmic.exe
Token: SeManageVolumePrivilege	2000	wmic.exe
Token: 33	2000	wmic.exe
Token: 34	2000	wmic.exe
Token: 35	2000	wmic.exe
Token: SeIncreaseQuotaPrivilege	2000	wmic.exe
Token: SeSecurityPrivilege	2000	wmic.exe
Token: SeTakeOwnershipPrivilege	2000	wmic.exe
Token: SeLoadDriverPrivilege	2000	wmic.exe
Token: SeSystemProfilePrivilege	2000	wmic.exe
Token: SeSystemtimePrivilege	2000	wmic.exe
Token: SeProfSingleProcessPrivilege	2000	wmic.exe
Token: SeIncBasePriorityPrivilege	2000	wmic.exe
Token: SeCreatePagefilePrivilege	2000	wmic.exe
Token: SeBackupPrivilege	2000	wmic.exe
Token: SeRestorePrivilege	2000	wmic.exe
Token: SeShutdownPrivilege	2000	wmic.exe
Token: SeDebugPrivilege	2000	wmic.exe
Token: SeSystemEnvironmentPrivilege	2000	wmic.exe
Token: SeRemoteShutdownPrivilege	2000	wmic.exe
Token: SeUndockPrivilege	2000	wmic.exe
Token: SeManageVolumePrivilege	2000	wmic.exe
Token: 33	2000	wmic.exe
Token: 34	2000	wmic.exe
Token: 35	2000	wmic.exe
Token: SeIncreaseQuotaPrivilege	2032	wmic.exe
Token: SeSecurityPrivilege	2032	wmic.exe
Token: SeTakeOwnershipPrivilege	2032	wmic.exe
Token: SeLoadDriverPrivilege	2032	wmic.exe
Token: SeSystemProfilePrivilege	2032	wmic.exe
Token: SeSystemtimePrivilege	2032	wmic.exe
Token: SeProfSingleProcessPrivilege	2032	wmic.exe
Token: SeIncBasePriorityPrivilege	2032	wmic.exe
Token: SeCreatePagefilePrivilege	2032	wmic.exe
Token: SeBackupPrivilege	2032	wmic.exe
Token: SeRestorePrivilege	2032	wmic.exe
Token: SeShutdownPrivilege	2032	wmic.exe
Token: SeDebugPrivilege	2032	wmic.exe
Token: SeSystemEnvironmentPrivilege	2032	wmic.exe
Token: SeRemoteShutdownPrivilege	2032	wmic.exe

Suspicious use of FindShellTrayWindow 4 IoCs

pid	Process
2404	7zFM.exe
2404	7zFM.exe
2404	7zFM.exe
2404	7zFM.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2404 wrote to memory of 1304	2404	7zFM.exe	31
PID 2404 wrote to memory of 1304	2404	7zFM.exe	31
PID 2404 wrote to memory of 1304	2404	7zFM.exe	31
PID 1304 wrote to memory of 2536	1304	Kraxx-Builder.exe	32
PID 1304 wrote to memory of 2536	1304	Kraxx-Builder.exe	32
PID 1304 wrote to memory of 2536	1304	Kraxx-Builder.exe	32
PID 1304 wrote to memory of 2668	1304	Kraxx-Builder.exe	34
PID 1304 wrote to memory of 2668	1304	Kraxx-Builder.exe	34
PID 1304 wrote to memory of 2668	1304	Kraxx-Builder.exe	34
PID 1304 wrote to memory of 2224	1304	Kraxx-Builder.exe	36
PID 1304 wrote to memory of 2224	1304	Kraxx-Builder.exe	36
PID 1304 wrote to memory of 2224	1304	Kraxx-Builder.exe	36
PID 1304 wrote to memory of 2788	1304	Kraxx-Builder.exe	38
PID 1304 wrote to memory of 2788	1304	Kraxx-Builder.exe	38
PID 1304 wrote to memory of 2788	1304	Kraxx-Builder.exe	38
PID 1304 wrote to memory of 2000	1304	Kraxx-Builder.exe	40
PID 1304 wrote to memory of 2000	1304	Kraxx-Builder.exe	40
PID 1304 wrote to memory of 2000	1304	Kraxx-Builder.exe	40
PID 1304 wrote to memory of 2032	1304	Kraxx-Builder.exe	43
PID 1304 wrote to memory of 2032	1304	Kraxx-Builder.exe	43
PID 1304 wrote to memory of 2032	1304	Kraxx-Builder.exe	43
PID 1304 wrote to memory of 2900	1304	Kraxx-Builder.exe	45
PID 1304 wrote to memory of 2900	1304	Kraxx-Builder.exe	45
PID 1304 wrote to memory of 2900	1304	Kraxx-Builder.exe	45
PID 1304 wrote to memory of 1948	1304	Kraxx-Builder.exe	47
PID 1304 wrote to memory of 1948	1304	Kraxx-Builder.exe	47
PID 1304 wrote to memory of 1948	1304	Kraxx-Builder.exe	47
PID 1304 wrote to memory of 1712	1304	Kraxx-Builder.exe	49
PID 1304 wrote to memory of 1712	1304	Kraxx-Builder.exe	49
PID 1304 wrote to memory of 1712	1304	Kraxx-Builder.exe	49

C:\Program Files\7-Zip\7zFM.exe
"C:\Program Files\7-Zip\7zFM.exe" "C:\Users\Admin\AppData\Local\Temp\KraxxStealer-main.zip"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
PID:2404
- C:\Users\Admin\AppData\Local\Temp\7zO4694F237\Kraxx-Builder.exe
  "C:\Users\Admin\AppData\Local\Temp\7zO4694F237\Kraxx-Builder.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1304
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\7zO4694F237\Kraxx-Builder.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2536
- - 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
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2668
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2224
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2788
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" os get Caption
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:2000
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" computersystem get totalphysicalmemory
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:2032
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    PID:2900
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    PID:1948
- - C:\Windows\System32\Wbem\wmic.exe
    "wmic" path win32_VideoController get name
    3⤵
    - Detects videocard installed
    PID:1712

C:\Windows\explorer.exe
"C:\Windows\explorer.exe"
1⤵
PID:1124

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\Local\Temp\7zO4694F237\Kraxx-Builder.exe

Filesize
229KB

MD5
1c615c8e4fc8fbbf2519a03471cdac01

SHA1
5388ec05cbe0f0928ae7f9be41ed99a5a5607d05

SHA256
035d79db8e3afcf56dfc240fb3df650409d78ae18d7f7eafdf00d38a5c520fa3

SHA512
3c624edec97f885aaf06ffa5d0628e453fcb76066524ac7316dbcf85f20ab4605616234b6348c3cad17d8057a6db7ae0b16f8bf44a950326244a98bd1b615ce2

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
49556497703b3dbbf40ca72c2d17d81c

SHA1
41ee97fd724cd5902269f479b59825b7f2a128a0

SHA256
0a577076772288adb758a95db5718a080b67bb82d202ea0ba501f2092042181d

SHA512
1623fbb47671a72abd2d2ba88f76b694b7a7a8dcaa2fdea687d82ee9dd970503ef74fb3474fd54e6f8a87d67558ed8393cbbb2021baadd50863da0b134a48eba

Download Submit
memory/1304-11-0x00000000000F0000-0x0000000000130000-memory.dmp

Filesize
256KB

Download
memory/1948-52-0x000000001B620000-0x000000001B902000-memory.dmp

Filesize
2.9MB

Download
memory/2536-16-0x000000001B540000-0x000000001B822000-memory.dmp

Filesize
2.9MB

Download
memory/2536-17-0x0000000001DB0000-0x0000000001DB8000-memory.dmp

Filesize
32KB

Download
memory/2668-23-0x000000001B5C0000-0x000000001B8A2000-memory.dmp

Filesize
2.9MB

Download
memory/2668-24-0x0000000001E60000-0x0000000001E68000-memory.dmp

Filesize
32KB

Download