umbral | bb8117f1bf2b6af1409762f7959448c15f7cad6a3ad5c8cf484da64fe1dcafc0

Analysis

max time kernel
135s
max time network
105s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
22-05-2024 14:25

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General

Target

start.dll.exe
Size

232KB
MD5

ec6f1481d7bb030213e34efe0590f54b
SHA1

f3e453c2534a88bea7da27043a781e3eb8650e90
SHA256

bb8117f1bf2b6af1409762f7959448c15f7cad6a3ad5c8cf484da64fe1dcafc0
SHA512

9284b5f85a730c70c7a88a70751d1e20bce7eb7d55d98f808e8cbab83e3f36df87e344091de5b04c0738cad47569d704cf5537e1e40ad50cc73508b8bff16fc0
SSDEEP

6144:tloZM3fsXtioRkts/cnnK6cMl3kOA4+ZRSZ3qCDjaI1/b8e1mWi:voZ1tlRk83Ml3kOA4+ZRSZ3qCDjaoc

Score

10^/10

umbral execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral2/memory/4480-0-0x0000026342180000-0x00000263421C0000-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
2640	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	start.dll.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

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
6	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
1356	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1112	PING.EXE

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
4480	start.dll.exe
2640	powershell.exe
2640	powershell.exe
2800	powershell.exe
2800	powershell.exe
1164	powershell.exe
1164	powershell.exe
4332	powershell.exe
4332	powershell.exe
4808	powershell.exe
4808	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	4480	start.dll.exe
Token: SeIncreaseQuotaPrivilege	3956	wmic.exe
Token: SeSecurityPrivilege	3956	wmic.exe
Token: SeTakeOwnershipPrivilege	3956	wmic.exe
Token: SeLoadDriverPrivilege	3956	wmic.exe
Token: SeSystemProfilePrivilege	3956	wmic.exe
Token: SeSystemtimePrivilege	3956	wmic.exe
Token: SeProfSingleProcessPrivilege	3956	wmic.exe
Token: SeIncBasePriorityPrivilege	3956	wmic.exe
Token: SeCreatePagefilePrivilege	3956	wmic.exe
Token: SeBackupPrivilege	3956	wmic.exe
Token: SeRestorePrivilege	3956	wmic.exe
Token: SeShutdownPrivilege	3956	wmic.exe
Token: SeDebugPrivilege	3956	wmic.exe
Token: SeSystemEnvironmentPrivilege	3956	wmic.exe
Token: SeRemoteShutdownPrivilege	3956	wmic.exe
Token: SeUndockPrivilege	3956	wmic.exe
Token: SeManageVolumePrivilege	3956	wmic.exe
Token: 33	3956	wmic.exe
Token: 34	3956	wmic.exe
Token: 35	3956	wmic.exe
Token: 36	3956	wmic.exe
Token: SeIncreaseQuotaPrivilege	3956	wmic.exe
Token: SeSecurityPrivilege	3956	wmic.exe
Token: SeTakeOwnershipPrivilege	3956	wmic.exe
Token: SeLoadDriverPrivilege	3956	wmic.exe
Token: SeSystemProfilePrivilege	3956	wmic.exe
Token: SeSystemtimePrivilege	3956	wmic.exe
Token: SeProfSingleProcessPrivilege	3956	wmic.exe
Token: SeIncBasePriorityPrivilege	3956	wmic.exe
Token: SeCreatePagefilePrivilege	3956	wmic.exe
Token: SeBackupPrivilege	3956	wmic.exe
Token: SeRestorePrivilege	3956	wmic.exe
Token: SeShutdownPrivilege	3956	wmic.exe
Token: SeDebugPrivilege	3956	wmic.exe
Token: SeSystemEnvironmentPrivilege	3956	wmic.exe
Token: SeRemoteShutdownPrivilege	3956	wmic.exe
Token: SeUndockPrivilege	3956	wmic.exe
Token: SeManageVolumePrivilege	3956	wmic.exe
Token: 33	3956	wmic.exe
Token: 34	3956	wmic.exe
Token: 35	3956	wmic.exe
Token: 36	3956	wmic.exe
Token: SeDebugPrivilege	2640	powershell.exe
Token: SeDebugPrivilege	2800	powershell.exe
Token: SeDebugPrivilege	1164	powershell.exe
Token: SeDebugPrivilege	4332	powershell.exe
Token: SeIncreaseQuotaPrivilege	4364	wmic.exe
Token: SeSecurityPrivilege	4364	wmic.exe
Token: SeTakeOwnershipPrivilege	4364	wmic.exe
Token: SeLoadDriverPrivilege	4364	wmic.exe
Token: SeSystemProfilePrivilege	4364	wmic.exe
Token: SeSystemtimePrivilege	4364	wmic.exe
Token: SeProfSingleProcessPrivilege	4364	wmic.exe
Token: SeIncBasePriorityPrivilege	4364	wmic.exe
Token: SeCreatePagefilePrivilege	4364	wmic.exe
Token: SeBackupPrivilege	4364	wmic.exe
Token: SeRestorePrivilege	4364	wmic.exe
Token: SeShutdownPrivilege	4364	wmic.exe
Token: SeDebugPrivilege	4364	wmic.exe
Token: SeSystemEnvironmentPrivilege	4364	wmic.exe
Token: SeRemoteShutdownPrivilege	4364	wmic.exe
Token: SeUndockPrivilege	4364	wmic.exe
Token: SeManageVolumePrivilege	4364	wmic.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 4480 wrote to memory of 3956	4480	start.dll.exe	84
PID 4480 wrote to memory of 3956	4480	start.dll.exe	84
PID 4480 wrote to memory of 3612	4480	start.dll.exe	87
PID 4480 wrote to memory of 3612	4480	start.dll.exe	87
PID 4480 wrote to memory of 2640	4480	start.dll.exe	89
PID 4480 wrote to memory of 2640	4480	start.dll.exe	89
PID 4480 wrote to memory of 2800	4480	start.dll.exe	94
PID 4480 wrote to memory of 2800	4480	start.dll.exe	94
PID 4480 wrote to memory of 1164	4480	start.dll.exe	97
PID 4480 wrote to memory of 1164	4480	start.dll.exe	97
PID 4480 wrote to memory of 4332	4480	start.dll.exe	99
PID 4480 wrote to memory of 4332	4480	start.dll.exe	99
PID 4480 wrote to memory of 4364	4480	start.dll.exe	103
PID 4480 wrote to memory of 4364	4480	start.dll.exe	103
PID 4480 wrote to memory of 1812	4480	start.dll.exe	105
PID 4480 wrote to memory of 1812	4480	start.dll.exe	105
PID 4480 wrote to memory of 1304	4480	start.dll.exe	107
PID 4480 wrote to memory of 1304	4480	start.dll.exe	107
PID 4480 wrote to memory of 4808	4480	start.dll.exe	109
PID 4480 wrote to memory of 4808	4480	start.dll.exe	109
PID 4480 wrote to memory of 1356	4480	start.dll.exe	111
PID 4480 wrote to memory of 1356	4480	start.dll.exe	111
PID 4480 wrote to memory of 4964	4480	start.dll.exe	114
PID 4480 wrote to memory of 4964	4480	start.dll.exe	114
PID 4964 wrote to memory of 1112	4964	cmd.exe	116
PID 4964 wrote to memory of 1112	4964	cmd.exe	116

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
3612	attrib.exe

C:\Users\Admin\AppData\Local\Temp\start.dll.exe
"C:\Users\Admin\AppData\Local\Temp\start.dll.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4480
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3956
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\start.dll.exe"
  2⤵
  - Views/modifies file attributes
  PID:3612
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\start.dll.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2640
- 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:2800
- 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:1164
- 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:4332
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4364
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:1812
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1304
- 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:4808
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:1356
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\start.dll.exe" && pause
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4964
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - Runs ping.exe
    PID:1112

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

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
39c2ac09b52b0685c7da5b25746d8a64

SHA1
c0ac1559da69dc9ad0496c11ce37ef9b907ea656

SHA256
c582429e23c81918907db9c7f32bef2d32c873f2da84fa450707482408e3a160

SHA512
9a6f4c5944cecdd6cf2114f7db583e4742a93b3c9eec6fd60328585370a8ba2f917f7ce689c0341d2dbf391f58ff34ee0088d9d2158ebb2450c547257da095a1

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

Filesize
1KB

MD5
276798eeb29a49dc6e199768bc9c2e71

SHA1
5fdc8ccb897ac2df7476fbb07517aca5b7a6205b

SHA256
cd0a1056e8f1b6cb5cb328532239d802f4e2aa8f8fcdc0fcb487684bd68e0dcc

SHA512
0d34fce64bbefc57d64fa6e03ca886952263d5f24df9c1c4cce6a1e8f5a47a9a21e9820f8d38caa7f7b43a52336ce00b738ea18419aaa7c788b72e04ce19e4f2

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

Filesize
1KB

MD5
45ad40f012b09e141955482368549640

SHA1
3f9cd15875c1e397c3b2b5592805577ae88a96cb

SHA256
ea3b59172f1a33677f9cb3843fb4d6093b806d3a7cf2f3c6d4692f5421f656ce

SHA512
3de08f8affca1c1450088f560776cf3d65146cadac43c06eb922c7b3cea436e519966cf38458303ffeb1a58c53f8952cffda6c34216fda7594e014b516e83b33

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_mx3jhkwe.fhz.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2640-8-0x000001F6BE790000-0x000001F6BE7B2000-memory.dmp

Filesize
136KB

Download
memory/2640-14-0x00007FF841E00000-0x00007FF8428C1000-memory.dmp

Filesize
10.8MB

Download
memory/2640-15-0x00007FF841E00000-0x00007FF8428C1000-memory.dmp

Filesize
10.8MB

Download
memory/2640-18-0x00007FF841E00000-0x00007FF8428C1000-memory.dmp

Filesize
10.8MB

Download
memory/2640-9-0x00007FF841E00000-0x00007FF8428C1000-memory.dmp

Filesize
10.8MB

Download
memory/4480-34-0x000002635C890000-0x000002635C8E0000-memory.dmp

Filesize
320KB

Download
memory/4480-33-0x000002635C910000-0x000002635C986000-memory.dmp

Filesize
472KB

Download
memory/4480-35-0x000002635C8E0000-0x000002635C8FE000-memory.dmp

Filesize
120KB

Download
memory/4480-1-0x00007FF841E03000-0x00007FF841E05000-memory.dmp

Filesize
8KB

Download
memory/4480-0-0x0000026342180000-0x00000263421C0000-memory.dmp

Filesize
256KB

Download
memory/4480-71-0x0000026343F30000-0x0000026343F3A000-memory.dmp

Filesize
40KB

Download
memory/4480-72-0x000002635C990000-0x000002635C9A2000-memory.dmp

Filesize
72KB

Download
memory/4480-2-0x00007FF841E00000-0x00007FF8428C1000-memory.dmp

Filesize
10.8MB

Download
memory/4480-90-0x00007FF841E00000-0x00007FF8428C1000-memory.dmp

Filesize
10.8MB

Download