umbral | 3329ef336752b999469c5e2b3437432b20bd02b71e8a4f5f0a5609006e298a5f

Analysis

max time kernel
80s
max time network
17s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
01-08-2024 23:57

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General

Target

21b7b37864afd5d1781a566f8aafc390N.exe
Size

3.1MB
MD5

21b7b37864afd5d1781a566f8aafc390
SHA1

99e11b58458f94e10d835c17a77076fa5adc9654
SHA256

3329ef336752b999469c5e2b3437432b20bd02b71e8a4f5f0a5609006e298a5f
SHA512

4c080e125c6ec11d550a3f679f2f31e90b8bb691d716d339e032d6967966fdd79d99936fe69e83752808d7b442a8c36b431f235f1a53fa643ba7b4bc05a08e7a
SSDEEP

49152:3wh6L+oabpsbpDeaUxVjjwYwdGhNjw+qazDlchix/7gnp2+Cn3fO9XQW2GV:X+oEOuT4YwqZwfhix/ELCm9XPXV

Score

10^/10

umbral credential_access discovery execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 5 IoCs

resource	yara_rule
behavioral1/memory/2632-15-0x0000000000400000-0x0000000000440000-memory.dmp	family_umbral
behavioral1/memory/2632-19-0x0000000000400000-0x0000000000440000-memory.dmp	family_umbral
behavioral1/memory/2632-17-0x0000000000400000-0x0000000000440000-memory.dmp	family_umbral
behavioral1/memory/2632-13-0x0000000000400000-0x0000000000440000-memory.dmp	family_umbral
behavioral1/memory/2632-12-0x0000000000400000-0x0000000000440000-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
2304	powershell.exe
2836	powershell.exe
624	powershell.exe
2116	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	RegAsm.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
7	discord.com
8	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
4	ip-api.com

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2652 set thread context of 2632	2652	21b7b37864afd5d1781a566f8aafc390N.exe	31

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe	attrib.exe

System Location Discovery: System Language Discovery 1 TTPs 14 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wmic.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wmic.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wmic.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wmic.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RegAsm.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wmic.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	attrib.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe

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
444	cmd.exe
2372	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
900	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2372	PING.EXE

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2632	RegAsm.exe
2304	powershell.exe
2836	powershell.exe
624	powershell.exe
1052	powershell.exe
2116	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2632	RegAsm.exe
Token: SeIncreaseQuotaPrivilege	1896	wmic.exe
Token: SeSecurityPrivilege	1896	wmic.exe
Token: SeTakeOwnershipPrivilege	1896	wmic.exe
Token: SeLoadDriverPrivilege	1896	wmic.exe
Token: SeSystemProfilePrivilege	1896	wmic.exe
Token: SeSystemtimePrivilege	1896	wmic.exe
Token: SeProfSingleProcessPrivilege	1896	wmic.exe
Token: SeIncBasePriorityPrivilege	1896	wmic.exe
Token: SeCreatePagefilePrivilege	1896	wmic.exe
Token: SeBackupPrivilege	1896	wmic.exe
Token: SeRestorePrivilege	1896	wmic.exe
Token: SeShutdownPrivilege	1896	wmic.exe
Token: SeDebugPrivilege	1896	wmic.exe
Token: SeSystemEnvironmentPrivilege	1896	wmic.exe
Token: SeRemoteShutdownPrivilege	1896	wmic.exe
Token: SeUndockPrivilege	1896	wmic.exe
Token: SeManageVolumePrivilege	1896	wmic.exe
Token: 33	1896	wmic.exe
Token: 34	1896	wmic.exe
Token: 35	1896	wmic.exe
Token: SeIncreaseQuotaPrivilege	1896	wmic.exe
Token: SeSecurityPrivilege	1896	wmic.exe
Token: SeTakeOwnershipPrivilege	1896	wmic.exe
Token: SeLoadDriverPrivilege	1896	wmic.exe
Token: SeSystemProfilePrivilege	1896	wmic.exe
Token: SeSystemtimePrivilege	1896	wmic.exe
Token: SeProfSingleProcessPrivilege	1896	wmic.exe
Token: SeIncBasePriorityPrivilege	1896	wmic.exe
Token: SeCreatePagefilePrivilege	1896	wmic.exe
Token: SeBackupPrivilege	1896	wmic.exe
Token: SeRestorePrivilege	1896	wmic.exe
Token: SeShutdownPrivilege	1896	wmic.exe
Token: SeDebugPrivilege	1896	wmic.exe
Token: SeSystemEnvironmentPrivilege	1896	wmic.exe
Token: SeRemoteShutdownPrivilege	1896	wmic.exe
Token: SeUndockPrivilege	1896	wmic.exe
Token: SeManageVolumePrivilege	1896	wmic.exe
Token: 33	1896	wmic.exe
Token: 34	1896	wmic.exe
Token: 35	1896	wmic.exe
Token: SeDebugPrivilege	2304	powershell.exe
Token: SeDebugPrivilege	2836	powershell.exe
Token: SeDebugPrivilege	624	powershell.exe
Token: SeDebugPrivilege	1052	powershell.exe
Token: SeIncreaseQuotaPrivilege	832	wmic.exe
Token: SeSecurityPrivilege	832	wmic.exe
Token: SeTakeOwnershipPrivilege	832	wmic.exe
Token: SeLoadDriverPrivilege	832	wmic.exe
Token: SeSystemProfilePrivilege	832	wmic.exe
Token: SeSystemtimePrivilege	832	wmic.exe
Token: SeProfSingleProcessPrivilege	832	wmic.exe
Token: SeIncBasePriorityPrivilege	832	wmic.exe
Token: SeCreatePagefilePrivilege	832	wmic.exe
Token: SeBackupPrivilege	832	wmic.exe
Token: SeRestorePrivilege	832	wmic.exe
Token: SeShutdownPrivilege	832	wmic.exe
Token: SeDebugPrivilege	832	wmic.exe
Token: SeSystemEnvironmentPrivilege	832	wmic.exe
Token: SeRemoteShutdownPrivilege	832	wmic.exe
Token: SeUndockPrivilege	832	wmic.exe
Token: SeManageVolumePrivilege	832	wmic.exe
Token: 33	832	wmic.exe
Token: 34	832	wmic.exe

Suspicious use of WriteProcessMemory 64 IoCs

description	pid	Process	procid_target
PID 2652 wrote to memory of 2632	2652	21b7b37864afd5d1781a566f8aafc390N.exe	31
PID 2652 wrote to memory of 2632	2652	21b7b37864afd5d1781a566f8aafc390N.exe	31
PID 2652 wrote to memory of 2632	2652	21b7b37864afd5d1781a566f8aafc390N.exe	31
PID 2652 wrote to memory of 2632	2652	21b7b37864afd5d1781a566f8aafc390N.exe	31
PID 2652 wrote to memory of 2632	2652	21b7b37864afd5d1781a566f8aafc390N.exe	31
PID 2652 wrote to memory of 2632	2652	21b7b37864afd5d1781a566f8aafc390N.exe	31
PID 2652 wrote to memory of 2632	2652	21b7b37864afd5d1781a566f8aafc390N.exe	31
PID 2652 wrote to memory of 2632	2652	21b7b37864afd5d1781a566f8aafc390N.exe	31
PID 2652 wrote to memory of 2632	2652	21b7b37864afd5d1781a566f8aafc390N.exe	31
PID 2652 wrote to memory of 2632	2652	21b7b37864afd5d1781a566f8aafc390N.exe	31
PID 2652 wrote to memory of 2632	2652	21b7b37864afd5d1781a566f8aafc390N.exe	31
PID 2652 wrote to memory of 2632	2652	21b7b37864afd5d1781a566f8aafc390N.exe	31
PID 2632 wrote to memory of 1896	2632	RegAsm.exe	32
PID 2632 wrote to memory of 1896	2632	RegAsm.exe	32
PID 2632 wrote to memory of 1896	2632	RegAsm.exe	32
PID 2632 wrote to memory of 1896	2632	RegAsm.exe	32
PID 2632 wrote to memory of 2224	2632	RegAsm.exe	35
PID 2632 wrote to memory of 2224	2632	RegAsm.exe	35
PID 2632 wrote to memory of 2224	2632	RegAsm.exe	35
PID 2632 wrote to memory of 2224	2632	RegAsm.exe	35
PID 2632 wrote to memory of 2304	2632	RegAsm.exe	37
PID 2632 wrote to memory of 2304	2632	RegAsm.exe	37
PID 2632 wrote to memory of 2304	2632	RegAsm.exe	37
PID 2632 wrote to memory of 2304	2632	RegAsm.exe	37
PID 2632 wrote to memory of 2836	2632	RegAsm.exe	39
PID 2632 wrote to memory of 2836	2632	RegAsm.exe	39
PID 2632 wrote to memory of 2836	2632	RegAsm.exe	39
PID 2632 wrote to memory of 2836	2632	RegAsm.exe	39
PID 2632 wrote to memory of 624	2632	RegAsm.exe	41
PID 2632 wrote to memory of 624	2632	RegAsm.exe	41
PID 2632 wrote to memory of 624	2632	RegAsm.exe	41
PID 2632 wrote to memory of 624	2632	RegAsm.exe	41
PID 2632 wrote to memory of 1052	2632	RegAsm.exe	43
PID 2632 wrote to memory of 1052	2632	RegAsm.exe	43
PID 2632 wrote to memory of 1052	2632	RegAsm.exe	43
PID 2632 wrote to memory of 1052	2632	RegAsm.exe	43
PID 2632 wrote to memory of 832	2632	RegAsm.exe	45
PID 2632 wrote to memory of 832	2632	RegAsm.exe	45
PID 2632 wrote to memory of 832	2632	RegAsm.exe	45
PID 2632 wrote to memory of 832	2632	RegAsm.exe	45
PID 2632 wrote to memory of 108	2632	RegAsm.exe	47
PID 2632 wrote to memory of 108	2632	RegAsm.exe	47
PID 2632 wrote to memory of 108	2632	RegAsm.exe	47
PID 2632 wrote to memory of 108	2632	RegAsm.exe	47
PID 2632 wrote to memory of 2504	2632	RegAsm.exe	49
PID 2632 wrote to memory of 2504	2632	RegAsm.exe	49
PID 2632 wrote to memory of 2504	2632	RegAsm.exe	49
PID 2632 wrote to memory of 2504	2632	RegAsm.exe	49
PID 2632 wrote to memory of 2116	2632	RegAsm.exe	51
PID 2632 wrote to memory of 2116	2632	RegAsm.exe	51
PID 2632 wrote to memory of 2116	2632	RegAsm.exe	51
PID 2632 wrote to memory of 2116	2632	RegAsm.exe	51
PID 2632 wrote to memory of 900	2632	RegAsm.exe	53
PID 2632 wrote to memory of 900	2632	RegAsm.exe	53
PID 2632 wrote to memory of 900	2632	RegAsm.exe	53
PID 2632 wrote to memory of 900	2632	RegAsm.exe	53
PID 2632 wrote to memory of 444	2632	RegAsm.exe	55
PID 2632 wrote to memory of 444	2632	RegAsm.exe	55
PID 2632 wrote to memory of 444	2632	RegAsm.exe	55
PID 2632 wrote to memory of 444	2632	RegAsm.exe	55
PID 444 wrote to memory of 2372	444	cmd.exe	57
PID 444 wrote to memory of 2372	444	cmd.exe	57
PID 444 wrote to memory of 2372	444	cmd.exe	57
PID 444 wrote to memory of 2372	444	cmd.exe	57

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2224	attrib.exe

C:\Users\Admin\AppData\Local\Temp\21b7b37864afd5d1781a566f8aafc390N.exe
"C:\Users\Admin\AppData\Local\Temp\21b7b37864afd5d1781a566f8aafc390N.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2652
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  - Drops file in Drivers directory
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2632
- - C:\Windows\SysWOW64\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:1896
- - C:\Windows\SysWOW64\attrib.exe
    "attrib.exe" +h +s "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
    3⤵
    - Drops file in Windows directory
    - System Location Discovery: System Language Discovery
    - Views/modifies file attributes
    PID:2224
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2304
- - C:\Windows\SysWOW64\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
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2836
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:624
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1052
- - C:\Windows\SysWOW64\Wbem\wmic.exe
    "wmic.exe" os get Caption
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:832
- - C:\Windows\SysWOW64\Wbem\wmic.exe
    "wmic.exe" computersystem get totalphysicalmemory
    3⤵
    - System Location Discovery: System Language Discovery
    PID:108
- - C:\Windows\SysWOW64\Wbem\wmic.exe
    "wmic.exe" csproduct get uuid
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2504
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    PID:2116
- - C:\Windows\SysWOW64\Wbem\wmic.exe
    "wmic" path win32_VideoController get name
    3⤵
    - System Location Discovery: System Language Discovery
    - Detects videocard installed
    PID:900
- - C:\Windows\SysWOW64\cmd.exe
    "cmd.exe" /c ping localhost && del /F /A h "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe" && pause
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:444
  - - C:\Windows\SysWOW64\PING.EXE
      ping localhost
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:2372

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 Location Discovery

T1614

System Language Discovery

T1614.001

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\d93f411851d7c929.customDestinations-ms

Filesize
7KB

MD5
184d0eea4b66fda9ee2bb37ee8ce58d0

SHA1
cff7882a57acd9ee74cf3e5d6458e232e22bca6d

SHA256
f3d5ba294e1e03aa7e04dd383813cd35f8af28b54f823f4229306d119e95f25e

SHA512
9daf15d1bf1304bee2d26941898c66b085dd922c2923c4c9d206b6a4d60e0e1180ea725d44237cb45bb1fa739b778db685f912f7a546328e350f55f62d7d5d8b

Download Submit
memory/2632-14-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2632-8-0x0000000000400000-0x0000000000440000-memory.dmp

Filesize
256KB

Download
memory/2632-15-0x0000000000400000-0x0000000000440000-memory.dmp

Filesize
256KB

Download
memory/2632-10-0x0000000000400000-0x0000000000440000-memory.dmp

Filesize
256KB

Download
memory/2632-19-0x0000000000400000-0x0000000000440000-memory.dmp

Filesize
256KB

Download
memory/2632-12-0x0000000000400000-0x0000000000440000-memory.dmp

Filesize
256KB

Download
memory/2632-13-0x0000000000400000-0x0000000000440000-memory.dmp

Filesize
256KB

Download
memory/2632-17-0x0000000000400000-0x0000000000440000-memory.dmp

Filesize
256KB

Download
memory/2652-6-0x000007FEF58C0000-0x000007FEF62AC000-memory.dmp

Filesize
9.9MB

Download
memory/2652-5-0x0000000005410000-0x000000000546E000-memory.dmp

Filesize
376KB

Download
memory/2652-3-0x000007FEF58C0000-0x000007FEF62AC000-memory.dmp

Filesize
9.9MB

Download
memory/2652-0-0x000007FEF58C3000-0x000007FEF58C4000-memory.dmp

Filesize
4KB

Download
memory/2652-7-0x0000000005680000-0x0000000005706000-memory.dmp

Filesize
536KB

Download
memory/2652-2-0x000007FEF58C0000-0x000007FEF62AC000-memory.dmp

Filesize
9.9MB

Download
memory/2652-4-0x000007FEF58C0000-0x000007FEF62AC000-memory.dmp

Filesize
9.9MB

Download
memory/2652-20-0x000007FEF58C0000-0x000007FEF62AC000-memory.dmp

Filesize
9.9MB

Download
memory/2652-1-0x000000001E980000-0x000000001EC1C000-memory.dmp

Filesize
2.6MB

Download