umbral | 3a1b731d964fa9378d37657812ded01ae6a97b15eb114063555045334eee4c26

Analysis

max time kernel
34s
max time network
35s
platform
windows10-2004_x64
resource
win10v2004-20240730-en
resource tags

arch:x64arch:x86image:win10v2004-20240730-enlocale:en-usos:windows10-2004-x64system
submitted
31-07-2024 15:06

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General

Target

Bootstrapper.exe
Size

494KB
MD5

b80c04df4f7fd690ce34cf65b30ab204
SHA1

c9348af979d56319086f1448d0681def08da6430
SHA256

3a1b731d964fa9378d37657812ded01ae6a97b15eb114063555045334eee4c26
SHA512

04d0f4399141e44a9ba9579e7d161678f5f9ce8f9b9011ed95e5b239256765ea8fbc989bafb75bc428e330e815359633c8b7438cca603b9849da2cc27eb82fc7
SSDEEP

12288:VoZ0L+EP8N6zJW0b3cQNImHHmr0HcPTywWQ+Ples:QI8MzJW0b3cQNImHHmr0iOwWL

Score

10^/10

umbral credential_access execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral2/memory/2580-0-0x000001D22B060000-0x000001D22B0E2000-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
4384	powershell.exe
4536	powershell.exe
232	powershell.exe
4856	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
19	discord.com
20	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
3	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2876	wmic.exe

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
2580	Bootstrapper.exe
4856	powershell.exe
4856	powershell.exe
4384	powershell.exe
4384	powershell.exe
4536	powershell.exe
4536	powershell.exe
3300	powershell.exe
3300	powershell.exe
232	powershell.exe
232	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2580	Bootstrapper.exe
Token: SeIncreaseQuotaPrivilege	4584	wmic.exe
Token: SeSecurityPrivilege	4584	wmic.exe
Token: SeTakeOwnershipPrivilege	4584	wmic.exe
Token: SeLoadDriverPrivilege	4584	wmic.exe
Token: SeSystemProfilePrivilege	4584	wmic.exe
Token: SeSystemtimePrivilege	4584	wmic.exe
Token: SeProfSingleProcessPrivilege	4584	wmic.exe
Token: SeIncBasePriorityPrivilege	4584	wmic.exe
Token: SeCreatePagefilePrivilege	4584	wmic.exe
Token: SeBackupPrivilege	4584	wmic.exe
Token: SeRestorePrivilege	4584	wmic.exe
Token: SeShutdownPrivilege	4584	wmic.exe
Token: SeDebugPrivilege	4584	wmic.exe
Token: SeSystemEnvironmentPrivilege	4584	wmic.exe
Token: SeRemoteShutdownPrivilege	4584	wmic.exe
Token: SeUndockPrivilege	4584	wmic.exe
Token: SeManageVolumePrivilege	4584	wmic.exe
Token: 33	4584	wmic.exe
Token: 34	4584	wmic.exe
Token: 35	4584	wmic.exe
Token: 36	4584	wmic.exe
Token: SeIncreaseQuotaPrivilege	4584	wmic.exe
Token: SeSecurityPrivilege	4584	wmic.exe
Token: SeTakeOwnershipPrivilege	4584	wmic.exe
Token: SeLoadDriverPrivilege	4584	wmic.exe
Token: SeSystemProfilePrivilege	4584	wmic.exe
Token: SeSystemtimePrivilege	4584	wmic.exe
Token: SeProfSingleProcessPrivilege	4584	wmic.exe
Token: SeIncBasePriorityPrivilege	4584	wmic.exe
Token: SeCreatePagefilePrivilege	4584	wmic.exe
Token: SeBackupPrivilege	4584	wmic.exe
Token: SeRestorePrivilege	4584	wmic.exe
Token: SeShutdownPrivilege	4584	wmic.exe
Token: SeDebugPrivilege	4584	wmic.exe
Token: SeSystemEnvironmentPrivilege	4584	wmic.exe
Token: SeRemoteShutdownPrivilege	4584	wmic.exe
Token: SeUndockPrivilege	4584	wmic.exe
Token: SeManageVolumePrivilege	4584	wmic.exe
Token: 33	4584	wmic.exe
Token: 34	4584	wmic.exe
Token: 35	4584	wmic.exe
Token: 36	4584	wmic.exe
Token: SeDebugPrivilege	4856	powershell.exe
Token: SeDebugPrivilege	4384	powershell.exe
Token: SeDebugPrivilege	4536	powershell.exe
Token: SeDebugPrivilege	3300	powershell.exe
Token: SeIncreaseQuotaPrivilege	3872	wmic.exe
Token: SeSecurityPrivilege	3872	wmic.exe
Token: SeTakeOwnershipPrivilege	3872	wmic.exe
Token: SeLoadDriverPrivilege	3872	wmic.exe
Token: SeSystemProfilePrivilege	3872	wmic.exe
Token: SeSystemtimePrivilege	3872	wmic.exe
Token: SeProfSingleProcessPrivilege	3872	wmic.exe
Token: SeIncBasePriorityPrivilege	3872	wmic.exe
Token: SeCreatePagefilePrivilege	3872	wmic.exe
Token: SeBackupPrivilege	3872	wmic.exe
Token: SeRestorePrivilege	3872	wmic.exe
Token: SeShutdownPrivilege	3872	wmic.exe
Token: SeDebugPrivilege	3872	wmic.exe
Token: SeSystemEnvironmentPrivilege	3872	wmic.exe
Token: SeRemoteShutdownPrivilege	3872	wmic.exe
Token: SeUndockPrivilege	3872	wmic.exe
Token: SeManageVolumePrivilege	3872	wmic.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2580 wrote to memory of 4584	2580	Bootstrapper.exe	85
PID 2580 wrote to memory of 4584	2580	Bootstrapper.exe	85
PID 2580 wrote to memory of 4856	2580	Bootstrapper.exe	89
PID 2580 wrote to memory of 4856	2580	Bootstrapper.exe	89
PID 2580 wrote to memory of 4384	2580	Bootstrapper.exe	91
PID 2580 wrote to memory of 4384	2580	Bootstrapper.exe	91
PID 2580 wrote to memory of 4536	2580	Bootstrapper.exe	93
PID 2580 wrote to memory of 4536	2580	Bootstrapper.exe	93
PID 2580 wrote to memory of 3300	2580	Bootstrapper.exe	95
PID 2580 wrote to memory of 3300	2580	Bootstrapper.exe	95
PID 2580 wrote to memory of 3872	2580	Bootstrapper.exe	97
PID 2580 wrote to memory of 3872	2580	Bootstrapper.exe	97
PID 2580 wrote to memory of 2620	2580	Bootstrapper.exe	99
PID 2580 wrote to memory of 2620	2580	Bootstrapper.exe	99
PID 2580 wrote to memory of 1084	2580	Bootstrapper.exe	101
PID 2580 wrote to memory of 1084	2580	Bootstrapper.exe	101
PID 2580 wrote to memory of 232	2580	Bootstrapper.exe	103
PID 2580 wrote to memory of 232	2580	Bootstrapper.exe	103
PID 2580 wrote to memory of 2876	2580	Bootstrapper.exe	105
PID 2580 wrote to memory of 2876	2580	Bootstrapper.exe	105

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:2580
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4584
- 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:4856
- 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:4384
- 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:4536
- 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:3300
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3872
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:2620
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1084
- 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:232
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:2876

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

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

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
6d42b6da621e8df5674e26b799c8e2aa

SHA1
ab3ce1327ea1eeedb987ec823d5e0cb146bafa48

SHA256
5ab6a1726f425c6d0158f55eb8d81754ddedd51e651aa0a899a29b7a58619c4c

SHA512
53faffbda8a835bc1143e894c118c15901a5fd09cfc2224dd2f754c06dc794897315049a579b9a8382d4564f071576045aaaf824019b7139d939152dca38ce29

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

Filesize
948B

MD5
0b8cb2e6dd5794b6a56a4bdbbd430fd7

SHA1
2b08e348c3489c6a35761af073018e3784c12074

SHA256
bcce0d44e33747e4c39df9afbd0a4e98a47ded0188375e4dfdd94cafbb366e1f

SHA512
15ce3b588aa80899f69b0313c7e188d886bddbd09783ca732ac33f9ae8e4e017a72b6f98919f581383a4582732575e5faedb0dea87e01cf2b657424945fdf4d2

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
ec79fae4e7c09310ebf4f2d85a33a638

SHA1
f2bdd995b12e65e7ed437d228f22223b59e76efb

SHA256
e9c4723a5fe34e081c3d2f548a1d472394cc7aa58056fcf44ca542061381243a

SHA512
af9dda12f6bb388d826fe03a4a8beed9bda23a978aa55a2af6a43271660ee896a7ee3bcf2c4d2f1e6180902791d8c23560f1c2ec097a501d8c6f4f6c49075625

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ropv2kqt.p10.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2580-71-0x000001D22D0D0000-0x000001D22D0DA000-memory.dmp

Filesize
40KB

Download
memory/2580-35-0x000001D22D0B0000-0x000001D22D0CE000-memory.dmp

Filesize
120KB

Download
memory/2580-90-0x00007FFFC95F0000-0x00007FFFCA0B1000-memory.dmp

Filesize
10.8MB

Download
memory/2580-72-0x000001D246690000-0x000001D2466A2000-memory.dmp

Filesize
72KB

Download
memory/2580-2-0x00007FFFC95F0000-0x00007FFFCA0B1000-memory.dmp

Filesize
10.8MB

Download
memory/2580-34-0x000001D2457D0000-0x000001D245820000-memory.dmp

Filesize
320KB

Download
memory/2580-33-0x000001D245850000-0x000001D2458C6000-memory.dmp

Filesize
472KB

Download
memory/2580-0-0x000001D22B060000-0x000001D22B0E2000-memory.dmp

Filesize
520KB

Download
memory/2580-1-0x00007FFFC95F3000-0x00007FFFC95F5000-memory.dmp

Filesize
8KB

Download
memory/4856-15-0x00007FFFC95F0000-0x00007FFFCA0B1000-memory.dmp

Filesize
10.8MB

Download
memory/4856-14-0x00007FFFC95F0000-0x00007FFFCA0B1000-memory.dmp

Filesize
10.8MB

Download
memory/4856-12-0x000001CA3E270000-0x000001CA3E292000-memory.dmp

Filesize
136KB

Download
memory/4856-13-0x00007FFFC95F0000-0x00007FFFCA0B1000-memory.dmp

Filesize
10.8MB

Download
memory/4856-18-0x00007FFFC95F0000-0x00007FFFCA0B1000-memory.dmp

Filesize
10.8MB

Download