umbral | b5015182ecaa7561f27090fb7b2aab0decbbffc94606225b12676dc720266498

Analysis

max time kernel
93s
max time network
94s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
05-06-2024 17:41

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General

Target

C37Bootstrapper.exe
Size

407KB
MD5

2a25b9d935c4fe0a9f85251ecabfd923
SHA1

bebbdce90e0ba9eb1cf388f0db17dbb97775e9e2
SHA256

b5015182ecaa7561f27090fb7b2aab0decbbffc94606225b12676dc720266498
SHA512

08f31d8e8867fcdadb209d28ad3f654b694fe5ec19a289871d758ab75d7759f08c4b8f01c789be22c2e83dafa8ec9e861479003e1e091038074471c701bf9dbf
SSDEEP

6144:oloZMLrIkd8g+EtXHkv/iD4I7lXrRiK1AwBzOurZpjb8e1mVi4qkRH:2oZ0L+EP8I7lXrRiK1AwBzOurzr4J

Score

10^/10

umbral execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral2/memory/1572-0-0x00000233B0960000-0x00000233B09CC000-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
3904	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	C37Bootstrapper.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
21	discord.com
22	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
10	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
4628	wmic.exe

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
1572	C37Bootstrapper.exe
3904	powershell.exe
3904	powershell.exe
2828	powershell.exe
2828	powershell.exe
4672	powershell.exe
4672	powershell.exe
212	powershell.exe
212	powershell.exe
4848	powershell.exe
4848	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	1572	C37Bootstrapper.exe
Token: SeIncreaseQuotaPrivilege	3396	wmic.exe
Token: SeSecurityPrivilege	3396	wmic.exe
Token: SeTakeOwnershipPrivilege	3396	wmic.exe
Token: SeLoadDriverPrivilege	3396	wmic.exe
Token: SeSystemProfilePrivilege	3396	wmic.exe
Token: SeSystemtimePrivilege	3396	wmic.exe
Token: SeProfSingleProcessPrivilege	3396	wmic.exe
Token: SeIncBasePriorityPrivilege	3396	wmic.exe
Token: SeCreatePagefilePrivilege	3396	wmic.exe
Token: SeBackupPrivilege	3396	wmic.exe
Token: SeRestorePrivilege	3396	wmic.exe
Token: SeShutdownPrivilege	3396	wmic.exe
Token: SeDebugPrivilege	3396	wmic.exe
Token: SeSystemEnvironmentPrivilege	3396	wmic.exe
Token: SeRemoteShutdownPrivilege	3396	wmic.exe
Token: SeUndockPrivilege	3396	wmic.exe
Token: SeManageVolumePrivilege	3396	wmic.exe
Token: 33	3396	wmic.exe
Token: 34	3396	wmic.exe
Token: 35	3396	wmic.exe
Token: 36	3396	wmic.exe
Token: SeIncreaseQuotaPrivilege	3396	wmic.exe
Token: SeSecurityPrivilege	3396	wmic.exe
Token: SeTakeOwnershipPrivilege	3396	wmic.exe
Token: SeLoadDriverPrivilege	3396	wmic.exe
Token: SeSystemProfilePrivilege	3396	wmic.exe
Token: SeSystemtimePrivilege	3396	wmic.exe
Token: SeProfSingleProcessPrivilege	3396	wmic.exe
Token: SeIncBasePriorityPrivilege	3396	wmic.exe
Token: SeCreatePagefilePrivilege	3396	wmic.exe
Token: SeBackupPrivilege	3396	wmic.exe
Token: SeRestorePrivilege	3396	wmic.exe
Token: SeShutdownPrivilege	3396	wmic.exe
Token: SeDebugPrivilege	3396	wmic.exe
Token: SeSystemEnvironmentPrivilege	3396	wmic.exe
Token: SeRemoteShutdownPrivilege	3396	wmic.exe
Token: SeUndockPrivilege	3396	wmic.exe
Token: SeManageVolumePrivilege	3396	wmic.exe
Token: 33	3396	wmic.exe
Token: 34	3396	wmic.exe
Token: 35	3396	wmic.exe
Token: 36	3396	wmic.exe
Token: SeDebugPrivilege	3904	powershell.exe
Token: SeDebugPrivilege	2828	powershell.exe
Token: SeDebugPrivilege	4672	powershell.exe
Token: SeDebugPrivilege	212	powershell.exe
Token: SeIncreaseQuotaPrivilege	4808	wmic.exe
Token: SeSecurityPrivilege	4808	wmic.exe
Token: SeTakeOwnershipPrivilege	4808	wmic.exe
Token: SeLoadDriverPrivilege	4808	wmic.exe
Token: SeSystemProfilePrivilege	4808	wmic.exe
Token: SeSystemtimePrivilege	4808	wmic.exe
Token: SeProfSingleProcessPrivilege	4808	wmic.exe
Token: SeIncBasePriorityPrivilege	4808	wmic.exe
Token: SeCreatePagefilePrivilege	4808	wmic.exe
Token: SeBackupPrivilege	4808	wmic.exe
Token: SeRestorePrivilege	4808	wmic.exe
Token: SeShutdownPrivilege	4808	wmic.exe
Token: SeDebugPrivilege	4808	wmic.exe
Token: SeSystemEnvironmentPrivilege	4808	wmic.exe
Token: SeRemoteShutdownPrivilege	4808	wmic.exe
Token: SeUndockPrivilege	4808	wmic.exe
Token: SeManageVolumePrivilege	4808	wmic.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 1572 wrote to memory of 3396	1572	C37Bootstrapper.exe	83
PID 1572 wrote to memory of 3396	1572	C37Bootstrapper.exe	83
PID 1572 wrote to memory of 3904	1572	C37Bootstrapper.exe	87
PID 1572 wrote to memory of 3904	1572	C37Bootstrapper.exe	87
PID 1572 wrote to memory of 2828	1572	C37Bootstrapper.exe	90
PID 1572 wrote to memory of 2828	1572	C37Bootstrapper.exe	90
PID 1572 wrote to memory of 4672	1572	C37Bootstrapper.exe	92
PID 1572 wrote to memory of 4672	1572	C37Bootstrapper.exe	92
PID 1572 wrote to memory of 212	1572	C37Bootstrapper.exe	94
PID 1572 wrote to memory of 212	1572	C37Bootstrapper.exe	94
PID 1572 wrote to memory of 4808	1572	C37Bootstrapper.exe	98
PID 1572 wrote to memory of 4808	1572	C37Bootstrapper.exe	98
PID 1572 wrote to memory of 2028	1572	C37Bootstrapper.exe	100
PID 1572 wrote to memory of 2028	1572	C37Bootstrapper.exe	100
PID 1572 wrote to memory of 748	1572	C37Bootstrapper.exe	102
PID 1572 wrote to memory of 748	1572	C37Bootstrapper.exe	102
PID 1572 wrote to memory of 4848	1572	C37Bootstrapper.exe	104
PID 1572 wrote to memory of 4848	1572	C37Bootstrapper.exe	104
PID 1572 wrote to memory of 4628	1572	C37Bootstrapper.exe	106
PID 1572 wrote to memory of 4628	1572	C37Bootstrapper.exe	106

C:\Users\Admin\AppData\Local\Temp\C37Bootstrapper.exe
"C:\Users\Admin\AppData\Local\Temp\C37Bootstrapper.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1572
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3396
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\C37Bootstrapper.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3904
- 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:2828
- 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:4672
- 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:212
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4808
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:2028
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:748
- 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:4848
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:4628

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

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
6d3e9c29fe44e90aae6ed30ccf799ca8

SHA1
c7974ef72264bbdf13a2793ccf1aed11bc565dce

SHA256
2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d

SHA512
60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a

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

Filesize
948B

MD5
c65738617888921a153bd9b1ef516ee7

SHA1
5245e71ea3c181d76320c857b639272ac9e079b1

SHA256
4640ba4001fd16a593315299cbdd4988dc2c7075820687f1018aac40aca95c26

SHA512
2e2a0ebd93f9d8dd07a7599054bce232683e9add9a35e77b584618040bcfd84a42545352519ec4736cc379002210b6f3ed2d905591c6925c0981b0392b495bfa

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
c3b84be2bbf3c65d814edb1e6d8df10f

SHA1
1e23ead985215ee938f5280a0144529654ed5f3c

SHA256
a4f8c5af90aedc806d37e2b2adc3f80d0d0d99b681b497988b44c826d7093b2b

SHA512
397860732aadd6e68d2193ae93ce9307779d267e64e21787ff6edc5428b388c132ddf69af3fb353a4f316f6ba86a5993e6d7da04d0475fe21accfac4b8ac6ae7

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_2hoozi0f.tj5.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1572-71-0x00000233B2650000-0x00000233B265A000-memory.dmp

Filesize
40KB

Download
memory/1572-35-0x00000233B2600000-0x00000233B261E000-memory.dmp

Filesize
120KB

Download
memory/1572-90-0x00007FFD60D00000-0x00007FFD617C1000-memory.dmp

Filesize
10.8MB

Download
memory/1572-72-0x00000233B26E0000-0x00000233B26F2000-memory.dmp

Filesize
72KB

Download
memory/1572-2-0x00007FFD60D00000-0x00007FFD617C1000-memory.dmp

Filesize
10.8MB

Download
memory/1572-33-0x00000233CB140000-0x00000233CB1B6000-memory.dmp

Filesize
472KB

Download
memory/1572-34-0x00000233B2690000-0x00000233B26E0000-memory.dmp

Filesize
320KB

Download
memory/1572-0-0x00000233B0960000-0x00000233B09CC000-memory.dmp

Filesize
432KB

Download
memory/1572-1-0x00007FFD60D03000-0x00007FFD60D05000-memory.dmp

Filesize
8KB

Download
memory/3904-15-0x00007FFD60D00000-0x00007FFD617C1000-memory.dmp

Filesize
10.8MB

Download
memory/3904-13-0x00000223E4220000-0x00000223E4242000-memory.dmp

Filesize
136KB

Download
memory/3904-3-0x00007FFD60D00000-0x00007FFD617C1000-memory.dmp

Filesize
10.8MB

Download
memory/3904-14-0x00007FFD60D00000-0x00007FFD617C1000-memory.dmp

Filesize
10.8MB

Download
memory/3904-18-0x00007FFD60D00000-0x00007FFD617C1000-memory.dmp

Filesize
10.8MB

Download