umbral | 37f50c45194e4dcf42f6ab6cbc4af6a62fa2ce9ea7c00f4a6e4077262d017c32

Analysis

max time kernel
118s
max time network
119s
platform
windows7_x64
resource
win7-20240708-en
resource tags

arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-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
behavioral1/memory/2672-1-0x0000000000020000-0x0000000000060000-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
2208	powershell.exe
2876	powershell.exe
448	powershell.exe
2568	powershell.exe

Drops file in Drivers directory 1 IoCs

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

Deletes itself 1 IoCs

pid	Process
2428	cmd.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
7	discord.com
8	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
4	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
2428	cmd.exe
2420	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
1788	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2420	PING.EXE

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2672	Bloxstrap.exe
2568	powershell.exe
2208	powershell.exe
2876	powershell.exe
1068	powershell.exe
448	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2672	Bloxstrap.exe
Token: SeIncreaseQuotaPrivilege	2576	wmic.exe
Token: SeSecurityPrivilege	2576	wmic.exe
Token: SeTakeOwnershipPrivilege	2576	wmic.exe
Token: SeLoadDriverPrivilege	2576	wmic.exe
Token: SeSystemProfilePrivilege	2576	wmic.exe
Token: SeSystemtimePrivilege	2576	wmic.exe
Token: SeProfSingleProcessPrivilege	2576	wmic.exe
Token: SeIncBasePriorityPrivilege	2576	wmic.exe
Token: SeCreatePagefilePrivilege	2576	wmic.exe
Token: SeBackupPrivilege	2576	wmic.exe
Token: SeRestorePrivilege	2576	wmic.exe
Token: SeShutdownPrivilege	2576	wmic.exe
Token: SeDebugPrivilege	2576	wmic.exe
Token: SeSystemEnvironmentPrivilege	2576	wmic.exe
Token: SeRemoteShutdownPrivilege	2576	wmic.exe
Token: SeUndockPrivilege	2576	wmic.exe
Token: SeManageVolumePrivilege	2576	wmic.exe
Token: 33	2576	wmic.exe
Token: 34	2576	wmic.exe
Token: 35	2576	wmic.exe
Token: SeIncreaseQuotaPrivilege	2576	wmic.exe
Token: SeSecurityPrivilege	2576	wmic.exe
Token: SeTakeOwnershipPrivilege	2576	wmic.exe
Token: SeLoadDriverPrivilege	2576	wmic.exe
Token: SeSystemProfilePrivilege	2576	wmic.exe
Token: SeSystemtimePrivilege	2576	wmic.exe
Token: SeProfSingleProcessPrivilege	2576	wmic.exe
Token: SeIncBasePriorityPrivilege	2576	wmic.exe
Token: SeCreatePagefilePrivilege	2576	wmic.exe
Token: SeBackupPrivilege	2576	wmic.exe
Token: SeRestorePrivilege	2576	wmic.exe
Token: SeShutdownPrivilege	2576	wmic.exe
Token: SeDebugPrivilege	2576	wmic.exe
Token: SeSystemEnvironmentPrivilege	2576	wmic.exe
Token: SeRemoteShutdownPrivilege	2576	wmic.exe
Token: SeUndockPrivilege	2576	wmic.exe
Token: SeManageVolumePrivilege	2576	wmic.exe
Token: 33	2576	wmic.exe
Token: 34	2576	wmic.exe
Token: 35	2576	wmic.exe
Token: SeDebugPrivilege	2568	powershell.exe
Token: SeDebugPrivilege	2208	powershell.exe
Token: SeDebugPrivilege	2876	powershell.exe
Token: SeDebugPrivilege	1068	powershell.exe
Token: SeIncreaseQuotaPrivilege	2816	wmic.exe
Token: SeSecurityPrivilege	2816	wmic.exe
Token: SeTakeOwnershipPrivilege	2816	wmic.exe
Token: SeLoadDriverPrivilege	2816	wmic.exe
Token: SeSystemProfilePrivilege	2816	wmic.exe
Token: SeSystemtimePrivilege	2816	wmic.exe
Token: SeProfSingleProcessPrivilege	2816	wmic.exe
Token: SeIncBasePriorityPrivilege	2816	wmic.exe
Token: SeCreatePagefilePrivilege	2816	wmic.exe
Token: SeBackupPrivilege	2816	wmic.exe
Token: SeRestorePrivilege	2816	wmic.exe
Token: SeShutdownPrivilege	2816	wmic.exe
Token: SeDebugPrivilege	2816	wmic.exe
Token: SeSystemEnvironmentPrivilege	2816	wmic.exe
Token: SeRemoteShutdownPrivilege	2816	wmic.exe
Token: SeUndockPrivilege	2816	wmic.exe
Token: SeManageVolumePrivilege	2816	wmic.exe
Token: 33	2816	wmic.exe
Token: 34	2816	wmic.exe

Suspicious use of WriteProcessMemory 39 IoCs

description	pid	Process	procid_target
PID 2672 wrote to memory of 2576	2672	Bloxstrap.exe	30
PID 2672 wrote to memory of 2576	2672	Bloxstrap.exe	30
PID 2672 wrote to memory of 2576	2672	Bloxstrap.exe	30
PID 2672 wrote to memory of 2616	2672	Bloxstrap.exe	33
PID 2672 wrote to memory of 2616	2672	Bloxstrap.exe	33
PID 2672 wrote to memory of 2616	2672	Bloxstrap.exe	33
PID 2672 wrote to memory of 2568	2672	Bloxstrap.exe	35
PID 2672 wrote to memory of 2568	2672	Bloxstrap.exe	35
PID 2672 wrote to memory of 2568	2672	Bloxstrap.exe	35
PID 2672 wrote to memory of 2208	2672	Bloxstrap.exe	37
PID 2672 wrote to memory of 2208	2672	Bloxstrap.exe	37
PID 2672 wrote to memory of 2208	2672	Bloxstrap.exe	37
PID 2672 wrote to memory of 2876	2672	Bloxstrap.exe	39
PID 2672 wrote to memory of 2876	2672	Bloxstrap.exe	39
PID 2672 wrote to memory of 2876	2672	Bloxstrap.exe	39
PID 2672 wrote to memory of 1068	2672	Bloxstrap.exe	41
PID 2672 wrote to memory of 1068	2672	Bloxstrap.exe	41
PID 2672 wrote to memory of 1068	2672	Bloxstrap.exe	41
PID 2672 wrote to memory of 2816	2672	Bloxstrap.exe	43
PID 2672 wrote to memory of 2816	2672	Bloxstrap.exe	43
PID 2672 wrote to memory of 2816	2672	Bloxstrap.exe	43
PID 2672 wrote to memory of 2004	2672	Bloxstrap.exe	45
PID 2672 wrote to memory of 2004	2672	Bloxstrap.exe	45
PID 2672 wrote to memory of 2004	2672	Bloxstrap.exe	45
PID 2672 wrote to memory of 1820	2672	Bloxstrap.exe	47
PID 2672 wrote to memory of 1820	2672	Bloxstrap.exe	47
PID 2672 wrote to memory of 1820	2672	Bloxstrap.exe	47
PID 2672 wrote to memory of 448	2672	Bloxstrap.exe	49
PID 2672 wrote to memory of 448	2672	Bloxstrap.exe	49
PID 2672 wrote to memory of 448	2672	Bloxstrap.exe	49
PID 2672 wrote to memory of 1788	2672	Bloxstrap.exe	51
PID 2672 wrote to memory of 1788	2672	Bloxstrap.exe	51
PID 2672 wrote to memory of 1788	2672	Bloxstrap.exe	51
PID 2672 wrote to memory of 2428	2672	Bloxstrap.exe	53
PID 2672 wrote to memory of 2428	2672	Bloxstrap.exe	53
PID 2672 wrote to memory of 2428	2672	Bloxstrap.exe	53
PID 2428 wrote to memory of 2420	2428	cmd.exe	55
PID 2428 wrote to memory of 2420	2428	cmd.exe	55
PID 2428 wrote to memory of 2420	2428	cmd.exe	55

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2616	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:2672
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2576
- C:\Windows\system32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\Bloxstrap.exe"
  2⤵
  - Views/modifies file attributes
  PID:2616
- 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:2568
- 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:2208
- 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:2876
- 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:1068
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2816
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:2004
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1820
- 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:448
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:1788
- C:\Windows\system32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\Bloxstrap.exe" && pause
  2⤵
  - Deletes itself
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:2428
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:2420

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

Filesize
7KB

MD5
720718e4fbf28353ee3f88a3d86c3412

SHA1
d9eb25ce03e911635f7c791b6dfa8cd837424368

SHA256
5e8b2cafb42a1fb0c4d10f37a40694ec333c895557f73311a274690a2147e89f

SHA512
69ee4061e3f09378e38b7f36c1a093be73ca396c3dc7391f7baf8c81dc83542cc9f9a80efcbf7c055e04c14a9f1af791e5a0074a982c46e8e4389461df8af1d5

Download Submit
memory/448-42-0x0000000002890000-0x0000000002898000-memory.dmp

Filesize
32KB

Download
memory/2208-14-0x000000001B500000-0x000000001B7E2000-memory.dmp

Filesize
2.9MB

Download
memory/2208-15-0x0000000002970000-0x0000000002978000-memory.dmp

Filesize
32KB

Download
memory/2568-7-0x000000001B5C0000-0x000000001B8A2000-memory.dmp

Filesize
2.9MB

Download
memory/2568-8-0x0000000001D90000-0x0000000001D98000-memory.dmp

Filesize
32KB

Download
memory/2672-0-0x000007FEF4CA3000-0x000007FEF4CA4000-memory.dmp

Filesize
4KB

Download
memory/2672-1-0x0000000000020000-0x0000000000060000-memory.dmp

Filesize
256KB

Download
memory/2672-2-0x000007FEF4CA0000-0x000007FEF568C000-memory.dmp

Filesize
9.9MB

Download
memory/2672-46-0x000007FEF4CA0000-0x000007FEF568C000-memory.dmp

Filesize
9.9MB

Download