umbral | ca96eb38942e5c7f637142d52b2e8bcac496a4520b73dab10ae1ad313d79cbd3

Analysis

max time kernel
134s
max time network
144s
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 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
behavioral2/memory/4908-0-0x000002669D490000-0x000002669D4D0000-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
5032	powershell.exe
4812	powershell.exe
1616	powershell.exe
4980	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
26	discord.com
27	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
5040	cmd.exe
2816	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
3992	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2816	PING.EXE

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
4908	Bootstrapper.exe
4980	powershell.exe
4980	powershell.exe
5032	powershell.exe
5032	powershell.exe
4812	powershell.exe
4812	powershell.exe
2660	powershell.exe
2660	powershell.exe
1616	powershell.exe
1616	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	4908	Bootstrapper.exe
Token: SeIncreaseQuotaPrivilege	3756	wmic.exe
Token: SeSecurityPrivilege	3756	wmic.exe
Token: SeTakeOwnershipPrivilege	3756	wmic.exe
Token: SeLoadDriverPrivilege	3756	wmic.exe
Token: SeSystemProfilePrivilege	3756	wmic.exe
Token: SeSystemtimePrivilege	3756	wmic.exe
Token: SeProfSingleProcessPrivilege	3756	wmic.exe
Token: SeIncBasePriorityPrivilege	3756	wmic.exe
Token: SeCreatePagefilePrivilege	3756	wmic.exe
Token: SeBackupPrivilege	3756	wmic.exe
Token: SeRestorePrivilege	3756	wmic.exe
Token: SeShutdownPrivilege	3756	wmic.exe
Token: SeDebugPrivilege	3756	wmic.exe
Token: SeSystemEnvironmentPrivilege	3756	wmic.exe
Token: SeRemoteShutdownPrivilege	3756	wmic.exe
Token: SeUndockPrivilege	3756	wmic.exe
Token: SeManageVolumePrivilege	3756	wmic.exe
Token: 33	3756	wmic.exe
Token: 34	3756	wmic.exe
Token: 35	3756	wmic.exe
Token: 36	3756	wmic.exe
Token: SeIncreaseQuotaPrivilege	3756	wmic.exe
Token: SeSecurityPrivilege	3756	wmic.exe
Token: SeTakeOwnershipPrivilege	3756	wmic.exe
Token: SeLoadDriverPrivilege	3756	wmic.exe
Token: SeSystemProfilePrivilege	3756	wmic.exe
Token: SeSystemtimePrivilege	3756	wmic.exe
Token: SeProfSingleProcessPrivilege	3756	wmic.exe
Token: SeIncBasePriorityPrivilege	3756	wmic.exe
Token: SeCreatePagefilePrivilege	3756	wmic.exe
Token: SeBackupPrivilege	3756	wmic.exe
Token: SeRestorePrivilege	3756	wmic.exe
Token: SeShutdownPrivilege	3756	wmic.exe
Token: SeDebugPrivilege	3756	wmic.exe
Token: SeSystemEnvironmentPrivilege	3756	wmic.exe
Token: SeRemoteShutdownPrivilege	3756	wmic.exe
Token: SeUndockPrivilege	3756	wmic.exe
Token: SeManageVolumePrivilege	3756	wmic.exe
Token: 33	3756	wmic.exe
Token: 34	3756	wmic.exe
Token: 35	3756	wmic.exe
Token: 36	3756	wmic.exe
Token: SeDebugPrivilege	4980	powershell.exe
Token: SeDebugPrivilege	5032	powershell.exe
Token: SeDebugPrivilege	4812	powershell.exe
Token: SeDebugPrivilege	2660	powershell.exe
Token: SeIncreaseQuotaPrivilege	4208	wmic.exe
Token: SeSecurityPrivilege	4208	wmic.exe
Token: SeTakeOwnershipPrivilege	4208	wmic.exe
Token: SeLoadDriverPrivilege	4208	wmic.exe
Token: SeSystemProfilePrivilege	4208	wmic.exe
Token: SeSystemtimePrivilege	4208	wmic.exe
Token: SeProfSingleProcessPrivilege	4208	wmic.exe
Token: SeIncBasePriorityPrivilege	4208	wmic.exe
Token: SeCreatePagefilePrivilege	4208	wmic.exe
Token: SeBackupPrivilege	4208	wmic.exe
Token: SeRestorePrivilege	4208	wmic.exe
Token: SeShutdownPrivilege	4208	wmic.exe
Token: SeDebugPrivilege	4208	wmic.exe
Token: SeSystemEnvironmentPrivilege	4208	wmic.exe
Token: SeRemoteShutdownPrivilege	4208	wmic.exe
Token: SeUndockPrivilege	4208	wmic.exe
Token: SeManageVolumePrivilege	4208	wmic.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 4908 wrote to memory of 3756	4908	Bootstrapper.exe	84
PID 4908 wrote to memory of 3756	4908	Bootstrapper.exe	84
PID 4908 wrote to memory of 1692	4908	Bootstrapper.exe	90
PID 4908 wrote to memory of 1692	4908	Bootstrapper.exe	90
PID 4908 wrote to memory of 4980	4908	Bootstrapper.exe	92
PID 4908 wrote to memory of 4980	4908	Bootstrapper.exe	92
PID 4908 wrote to memory of 5032	4908	Bootstrapper.exe	94
PID 4908 wrote to memory of 5032	4908	Bootstrapper.exe	94
PID 4908 wrote to memory of 4812	4908	Bootstrapper.exe	96
PID 4908 wrote to memory of 4812	4908	Bootstrapper.exe	96
PID 4908 wrote to memory of 2660	4908	Bootstrapper.exe	98
PID 4908 wrote to memory of 2660	4908	Bootstrapper.exe	98
PID 4908 wrote to memory of 4208	4908	Bootstrapper.exe	102
PID 4908 wrote to memory of 4208	4908	Bootstrapper.exe	102
PID 4908 wrote to memory of 404	4908	Bootstrapper.exe	104
PID 4908 wrote to memory of 404	4908	Bootstrapper.exe	104
PID 4908 wrote to memory of 3684	4908	Bootstrapper.exe	106
PID 4908 wrote to memory of 3684	4908	Bootstrapper.exe	106
PID 4908 wrote to memory of 1616	4908	Bootstrapper.exe	108
PID 4908 wrote to memory of 1616	4908	Bootstrapper.exe	108
PID 4908 wrote to memory of 3992	4908	Bootstrapper.exe	111
PID 4908 wrote to memory of 3992	4908	Bootstrapper.exe	111
PID 4908 wrote to memory of 5040	4908	Bootstrapper.exe	113
PID 4908 wrote to memory of 5040	4908	Bootstrapper.exe	113
PID 5040 wrote to memory of 2816	5040	cmd.exe	115
PID 5040 wrote to memory of 2816	5040	cmd.exe	115

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
1692	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:4908
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3756
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\Bootstrapper.exe"
  2⤵
  - Views/modifies file attributes
  PID:1692
- 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:4980
- 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:5032
- 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:4812
- 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:2660
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4208
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:404
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:3684
- 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:1616
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:3992
- 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:5040
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:2816

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
d28a889fd956d5cb3accfbaf1143eb6f

SHA1
157ba54b365341f8ff06707d996b3635da8446f7

SHA256
21e5d7ccf80a293e6ba30ed728846ca19c929c52b96e2c8d34e27cd2234f1d45

SHA512
0b6d88deb9be85722e6a78d5886d49f2caf407a59e128d2b4ed74c1356f9928c40048a62731959f2460e9ff9d9feee311043d2a37abe3bb92c2b76a44281478c

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

Filesize
948B

MD5
966914e2e771de7a4a57a95b6ecfa8a9

SHA1
7a32282fd51dd032967ed4d9a40cc57e265aeff2

SHA256
98d3c70d7004fa807897317bd6cd3e977b9b6c72d4d2565aca0f9f8b1c315cba

SHA512
dc39c7124a9c7c8d4c7e8e16290c46360b8d9a8f4e43edaacbbeb09bdcf20159a53db54d2b322372001b6a3de52b2f88e9088b5fdbc7638816ae0d122bb015f5

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

Filesize
1KB

MD5
4950bb37b35849b09a86bc7c01c8952a

SHA1
f9650f41d105d3affa7b19d58ab336a92aab4793

SHA256
5d139a221345fe53f28d2a772c8e4c8e988925b6fc228c81baa98f824a44c67c

SHA512
5b39b845d6d53acd9a20fa1e3e081f7a4c5bbea4641ed53e6d1df8fb245a57e7a659cbdbdfe41ce642b6b2a7ff98b3dd3c9a5bcea7d226cead546d097f361a40

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

Filesize
1KB

MD5
af125c295a4eb2195f26c8ed6063a673

SHA1
677b1fc2131d12976968250f1fd8036fb65d7f49

SHA256
e04b803798ed80ff548179d82e18398c29d845245135ad0042c73bcbed42f349

SHA512
e2002b0b1f5cf1e9b20b44f5c0c373eff5edde379b7b6640438f3e37057bd547056fdbcac1f68ba9a7bfc9e9a70c15135bd85d89e8257c55ef71e6289963f170

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_0nge2yub.aul.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/4908-34-0x00000266B7A30000-0x00000266B7A4E000-memory.dmp

Filesize
120KB

Download
memory/4908-32-0x00000266B7C00000-0x00000266B7C76000-memory.dmp

Filesize
472KB

Download
memory/4908-33-0x00000266B7C80000-0x00000266B7CD0000-memory.dmp

Filesize
320KB

Download
memory/4908-0-0x000002669D490000-0x000002669D4D0000-memory.dmp

Filesize
256KB

Download
memory/4908-2-0x00007FFA19CF0000-0x00007FFA1A7B1000-memory.dmp

Filesize
10.8MB

Download
memory/4908-71-0x00000266B7BB0000-0x00000266B7BC2000-memory.dmp

Filesize
72KB

Download
memory/4908-70-0x00000266B7B80000-0x00000266B7B8A000-memory.dmp

Filesize
40KB

Download
memory/4908-1-0x00007FFA19CF3000-0x00007FFA19CF5000-memory.dmp

Filesize
8KB

Download
memory/4908-89-0x00007FFA19CF0000-0x00007FFA1A7B1000-memory.dmp

Filesize
10.8MB

Download
memory/4980-17-0x00007FFA19CF0000-0x00007FFA1A7B1000-memory.dmp

Filesize
10.8MB

Download
memory/4980-4-0x00000288E4520000-0x00000288E4542000-memory.dmp

Filesize
136KB

Download
memory/4980-11-0x00007FFA19CF0000-0x00007FFA1A7B1000-memory.dmp

Filesize
10.8MB

Download
memory/4980-3-0x00007FFA19CF0000-0x00007FFA1A7B1000-memory.dmp

Filesize
10.8MB

Download