umbral | 683532c9ddccd09aac6480c255099963803eac956ea1d5597c772ff13a8a7a31

Analysis

max time kernel
433s
max time network
1155s
platform
windows11-21h2_x64
resource
win11-20240802-en
resource tags

arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
submitted
06-09-2024 16:16

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General

Target

BootstrapperV1.13.exe
Size

229KB
MD5

224b37147484176752b12af33b9efd96
SHA1

d2fbb87ff49e0e80e8585b449fac349688d02f23
SHA256

2133a2c5f4a04d8ffe1ea436d035917ad16c50fa011b021c95c71f2660e67033
SHA512

e374e69dad1b3ad39887163e6c8cd07a88e36b167b91b0eeb8a5296f7345ea4c97e6e8e009193b321524f5326118900933e4657b0177b702036525d42c508704
SSDEEP

6144:9loZM+rIkd8g+EtXHkv/iD4lePZsyVtG/TOMdRYz7b8e1m4i:foZtL+EP8lePZsyVtG/TOMdRYDu

Score

10^/10

umbral credential_access discovery execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral2/memory/444-0-0x000002C6ACE50000-0x000002C6ACE90000-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
1020	powershell.exe
2980	powershell.exe
1472	powershell.exe
844	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	BootstrapperV1.13.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
1	discord.com
5	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
1	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
1132	cmd.exe
872	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
1060	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
872	PING.EXE

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
444	BootstrapperV1.13.exe
1020	powershell.exe
1020	powershell.exe
2980	powershell.exe
2980	powershell.exe
1472	powershell.exe
1472	powershell.exe
2544	powershell.exe
2544	powershell.exe
844	powershell.exe
844	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	444	BootstrapperV1.13.exe
Token: SeIncreaseQuotaPrivilege	3500	wmic.exe
Token: SeSecurityPrivilege	3500	wmic.exe
Token: SeTakeOwnershipPrivilege	3500	wmic.exe
Token: SeLoadDriverPrivilege	3500	wmic.exe
Token: SeSystemProfilePrivilege	3500	wmic.exe
Token: SeSystemtimePrivilege	3500	wmic.exe
Token: SeProfSingleProcessPrivilege	3500	wmic.exe
Token: SeIncBasePriorityPrivilege	3500	wmic.exe
Token: SeCreatePagefilePrivilege	3500	wmic.exe
Token: SeBackupPrivilege	3500	wmic.exe
Token: SeRestorePrivilege	3500	wmic.exe
Token: SeShutdownPrivilege	3500	wmic.exe
Token: SeDebugPrivilege	3500	wmic.exe
Token: SeSystemEnvironmentPrivilege	3500	wmic.exe
Token: SeRemoteShutdownPrivilege	3500	wmic.exe
Token: SeUndockPrivilege	3500	wmic.exe
Token: SeManageVolumePrivilege	3500	wmic.exe
Token: 33	3500	wmic.exe
Token: 34	3500	wmic.exe
Token: 35	3500	wmic.exe
Token: 36	3500	wmic.exe
Token: SeIncreaseQuotaPrivilege	3500	wmic.exe
Token: SeSecurityPrivilege	3500	wmic.exe
Token: SeTakeOwnershipPrivilege	3500	wmic.exe
Token: SeLoadDriverPrivilege	3500	wmic.exe
Token: SeSystemProfilePrivilege	3500	wmic.exe
Token: SeSystemtimePrivilege	3500	wmic.exe
Token: SeProfSingleProcessPrivilege	3500	wmic.exe
Token: SeIncBasePriorityPrivilege	3500	wmic.exe
Token: SeCreatePagefilePrivilege	3500	wmic.exe
Token: SeBackupPrivilege	3500	wmic.exe
Token: SeRestorePrivilege	3500	wmic.exe
Token: SeShutdownPrivilege	3500	wmic.exe
Token: SeDebugPrivilege	3500	wmic.exe
Token: SeSystemEnvironmentPrivilege	3500	wmic.exe
Token: SeRemoteShutdownPrivilege	3500	wmic.exe
Token: SeUndockPrivilege	3500	wmic.exe
Token: SeManageVolumePrivilege	3500	wmic.exe
Token: 33	3500	wmic.exe
Token: 34	3500	wmic.exe
Token: 35	3500	wmic.exe
Token: 36	3500	wmic.exe
Token: SeDebugPrivilege	1020	powershell.exe
Token: SeDebugPrivilege	2980	powershell.exe
Token: SeDebugPrivilege	1472	powershell.exe
Token: SeDebugPrivilege	2544	powershell.exe
Token: SeIncreaseQuotaPrivilege	1700	wmic.exe
Token: SeSecurityPrivilege	1700	wmic.exe
Token: SeTakeOwnershipPrivilege	1700	wmic.exe
Token: SeLoadDriverPrivilege	1700	wmic.exe
Token: SeSystemProfilePrivilege	1700	wmic.exe
Token: SeSystemtimePrivilege	1700	wmic.exe
Token: SeProfSingleProcessPrivilege	1700	wmic.exe
Token: SeIncBasePriorityPrivilege	1700	wmic.exe
Token: SeCreatePagefilePrivilege	1700	wmic.exe
Token: SeBackupPrivilege	1700	wmic.exe
Token: SeRestorePrivilege	1700	wmic.exe
Token: SeShutdownPrivilege	1700	wmic.exe
Token: SeDebugPrivilege	1700	wmic.exe
Token: SeSystemEnvironmentPrivilege	1700	wmic.exe
Token: SeRemoteShutdownPrivilege	1700	wmic.exe
Token: SeUndockPrivilege	1700	wmic.exe
Token: SeManageVolumePrivilege	1700	wmic.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 444 wrote to memory of 3500	444	BootstrapperV1.13.exe	81
PID 444 wrote to memory of 3500	444	BootstrapperV1.13.exe	81
PID 444 wrote to memory of 4796	444	BootstrapperV1.13.exe	84
PID 444 wrote to memory of 4796	444	BootstrapperV1.13.exe	84
PID 444 wrote to memory of 1020	444	BootstrapperV1.13.exe	86
PID 444 wrote to memory of 1020	444	BootstrapperV1.13.exe	86
PID 444 wrote to memory of 2980	444	BootstrapperV1.13.exe	88
PID 444 wrote to memory of 2980	444	BootstrapperV1.13.exe	88
PID 444 wrote to memory of 1472	444	BootstrapperV1.13.exe	90
PID 444 wrote to memory of 1472	444	BootstrapperV1.13.exe	90
PID 444 wrote to memory of 2544	444	BootstrapperV1.13.exe	92
PID 444 wrote to memory of 2544	444	BootstrapperV1.13.exe	92
PID 444 wrote to memory of 1700	444	BootstrapperV1.13.exe	94
PID 444 wrote to memory of 1700	444	BootstrapperV1.13.exe	94
PID 444 wrote to memory of 4528	444	BootstrapperV1.13.exe	96
PID 444 wrote to memory of 4528	444	BootstrapperV1.13.exe	96
PID 444 wrote to memory of 1000	444	BootstrapperV1.13.exe	98
PID 444 wrote to memory of 1000	444	BootstrapperV1.13.exe	98
PID 444 wrote to memory of 844	444	BootstrapperV1.13.exe	100
PID 444 wrote to memory of 844	444	BootstrapperV1.13.exe	100
PID 444 wrote to memory of 1060	444	BootstrapperV1.13.exe	102
PID 444 wrote to memory of 1060	444	BootstrapperV1.13.exe	102
PID 444 wrote to memory of 1132	444	BootstrapperV1.13.exe	104
PID 444 wrote to memory of 1132	444	BootstrapperV1.13.exe	104
PID 1132 wrote to memory of 872	1132	cmd.exe	106
PID 1132 wrote to memory of 872	1132	cmd.exe	106

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
4796	attrib.exe

C:\Users\Admin\AppData\Local\Temp\BootstrapperV1.13.exe
"C:\Users\Admin\AppData\Local\Temp\BootstrapperV1.13.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:444
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3500
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\BootstrapperV1.13.exe"
  2⤵
  - Views/modifies file attributes
  PID:4796
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\BootstrapperV1.13.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1020
- 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:2980
- 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:1472
- 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:2544
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1700
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:4528
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1000
- 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:844
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:1060
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\BootstrapperV1.13.exe" && pause
  2⤵
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:1132
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:872

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
627073ee3ca9676911bee35548eff2b8

SHA1
4c4b68c65e2cab9864b51167d710aa29ebdcff2e

SHA256
85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

SHA512
3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

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

Filesize
944B

MD5
2e8eb51096d6f6781456fef7df731d97

SHA1
ec2aaf851a618fb43c3d040a13a71997c25bda43

SHA256
96bfd9dd5883329927fe8c08b8956355a1a6ceb30ceeb5d4252b346df32bc864

SHA512
0a73dc9a49f92d9dd556c2ca2e36761890b3538f355ee1f013e7cf648d8c4d065f28046cd4a167db3dea304d1fbcbcea68d11ce6e12a3f20f8b6c018a60422d2

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

Filesize
948B

MD5
45741c307af2576c6437c5fdb24ef9ce

SHA1
a6ba7a7705db14ac29a18a98dd7deb4cc759c3bf

SHA256
7887859f7179e194ff9b78f8d8fa3830790110a01597f21ff48c84cd935e49d2

SHA512
39fdc5931563cbf826e8b643b5f0dcdf45bb6f95a8eeb460499257ca41b3dbee4c692eaacc3fd33bddf4b6ff0c828981ed7e9cd080007bbb9f0b28e7d0d66941

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

Filesize
1KB

MD5
a90b4707584041171553e72b34bfc940

SHA1
70eb4843983d6b57a7f255ace1e5cf3d068d7011

SHA256
378d2414a7626d27d1734ed4f5c9df44569aa85ee20939274c7d638e53b9cb1d

SHA512
2b02e49648472bb20675e5cc711a6a7481a3b185fc23408301dcf46f344e42241dab16134059be6ede27c9af744f5d0060758efcd0b6a6768c2ef486b3f4882e

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

Filesize
1KB

MD5
10254f48b63b60ae6245903153592e48

SHA1
2c300d1c60c50e8896705022bc402c423681f40a

SHA256
b3778ffb5260878714023fd1abc70c4e850b5397c2b32a3975b1ff28bfd96c69

SHA512
6a7e7844c47a07bc8fd0b59267f0d1bac460f672ada93131edd65ca2eb33159de9f6291a1acde745f32991b364e9ceac697f2dfcf1a2696b51a9120dd7af77d4

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_divl3c4a.zav.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/444-67-0x000002C6C75C0000-0x000002C6C75CA000-memory.dmp

Filesize
40KB

Download
memory/444-33-0x000002C6C75F0000-0x000002C6C760E000-memory.dmp

Filesize
120KB

Download
memory/444-85-0x00007FFB01BB0000-0x00007FFB02672000-memory.dmp

Filesize
10.8MB

Download
memory/444-68-0x000002C6C76E0000-0x000002C6C76F2000-memory.dmp

Filesize
72KB

Download
memory/444-2-0x00007FFB01BB0000-0x00007FFB02672000-memory.dmp

Filesize
10.8MB

Download
memory/444-31-0x000002C6C7610000-0x000002C6C7686000-memory.dmp

Filesize
472KB

Download
memory/444-32-0x000002C6C7690000-0x000002C6C76E0000-memory.dmp

Filesize
320KB

Download
memory/444-1-0x00007FFB01BB3000-0x00007FFB01BB5000-memory.dmp

Filesize
8KB

Download
memory/444-0-0x000002C6ACE50000-0x000002C6ACE90000-memory.dmp

Filesize
256KB

Download
memory/1020-14-0x00007FFB01BB0000-0x00007FFB02672000-memory.dmp

Filesize
10.8MB

Download
memory/1020-4-0x00007FFB01BB0000-0x00007FFB02672000-memory.dmp

Filesize
10.8MB

Download
memory/1020-3-0x00007FFB01BB0000-0x00007FFB02672000-memory.dmp

Filesize
10.8MB

Download
memory/1020-13-0x000001B34A2B0000-0x000001B34A2D2000-memory.dmp

Filesize
136KB

Download
memory/1020-17-0x00007FFB01BB0000-0x00007FFB02672000-memory.dmp

Filesize
10.8MB

Download