umbral | b5015182ecaa7561f27090fb7b2aab0decbbffc94606225b12676dc720266498

Resubmissions

Analysis

max time kernel
120s
max time network
125s
platform
windows7_x64
resource
win7-20240508-en
resource tags

arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system
submitted
05-06-2024 16:50

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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
behavioral1/memory/1580-1-0x0000000000A20000-0x0000000000A8C000-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
2764	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
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

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
2820	wmic.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1580	C37Bootstrapper.exe
2764	powershell.exe
2692	powershell.exe
2940	powershell.exe
1032	powershell.exe
2164	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	1580	C37Bootstrapper.exe
Token: SeIncreaseQuotaPrivilege	2680	wmic.exe
Token: SeSecurityPrivilege	2680	wmic.exe
Token: SeTakeOwnershipPrivilege	2680	wmic.exe
Token: SeLoadDriverPrivilege	2680	wmic.exe
Token: SeSystemProfilePrivilege	2680	wmic.exe
Token: SeSystemtimePrivilege	2680	wmic.exe
Token: SeProfSingleProcessPrivilege	2680	wmic.exe
Token: SeIncBasePriorityPrivilege	2680	wmic.exe
Token: SeCreatePagefilePrivilege	2680	wmic.exe
Token: SeBackupPrivilege	2680	wmic.exe
Token: SeRestorePrivilege	2680	wmic.exe
Token: SeShutdownPrivilege	2680	wmic.exe
Token: SeDebugPrivilege	2680	wmic.exe
Token: SeSystemEnvironmentPrivilege	2680	wmic.exe
Token: SeRemoteShutdownPrivilege	2680	wmic.exe
Token: SeUndockPrivilege	2680	wmic.exe
Token: SeManageVolumePrivilege	2680	wmic.exe
Token: 33	2680	wmic.exe
Token: 34	2680	wmic.exe
Token: 35	2680	wmic.exe
Token: SeIncreaseQuotaPrivilege	2680	wmic.exe
Token: SeSecurityPrivilege	2680	wmic.exe
Token: SeTakeOwnershipPrivilege	2680	wmic.exe
Token: SeLoadDriverPrivilege	2680	wmic.exe
Token: SeSystemProfilePrivilege	2680	wmic.exe
Token: SeSystemtimePrivilege	2680	wmic.exe
Token: SeProfSingleProcessPrivilege	2680	wmic.exe
Token: SeIncBasePriorityPrivilege	2680	wmic.exe
Token: SeCreatePagefilePrivilege	2680	wmic.exe
Token: SeBackupPrivilege	2680	wmic.exe
Token: SeRestorePrivilege	2680	wmic.exe
Token: SeShutdownPrivilege	2680	wmic.exe
Token: SeDebugPrivilege	2680	wmic.exe
Token: SeSystemEnvironmentPrivilege	2680	wmic.exe
Token: SeRemoteShutdownPrivilege	2680	wmic.exe
Token: SeUndockPrivilege	2680	wmic.exe
Token: SeManageVolumePrivilege	2680	wmic.exe
Token: 33	2680	wmic.exe
Token: 34	2680	wmic.exe
Token: 35	2680	wmic.exe
Token: SeDebugPrivilege	2764	powershell.exe
Token: SeDebugPrivilege	2692	powershell.exe
Token: SeDebugPrivilege	2940	powershell.exe
Token: SeDebugPrivilege	1032	powershell.exe
Token: SeIncreaseQuotaPrivilege	1564	wmic.exe
Token: SeSecurityPrivilege	1564	wmic.exe
Token: SeTakeOwnershipPrivilege	1564	wmic.exe
Token: SeLoadDriverPrivilege	1564	wmic.exe
Token: SeSystemProfilePrivilege	1564	wmic.exe
Token: SeSystemtimePrivilege	1564	wmic.exe
Token: SeProfSingleProcessPrivilege	1564	wmic.exe
Token: SeIncBasePriorityPrivilege	1564	wmic.exe
Token: SeCreatePagefilePrivilege	1564	wmic.exe
Token: SeBackupPrivilege	1564	wmic.exe
Token: SeRestorePrivilege	1564	wmic.exe
Token: SeShutdownPrivilege	1564	wmic.exe
Token: SeDebugPrivilege	1564	wmic.exe
Token: SeSystemEnvironmentPrivilege	1564	wmic.exe
Token: SeRemoteShutdownPrivilege	1564	wmic.exe
Token: SeUndockPrivilege	1564	wmic.exe
Token: SeManageVolumePrivilege	1564	wmic.exe
Token: 33	1564	wmic.exe
Token: 34	1564	wmic.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 1580 wrote to memory of 2680	1580	C37Bootstrapper.exe	28
PID 1580 wrote to memory of 2680	1580	C37Bootstrapper.exe	28
PID 1580 wrote to memory of 2680	1580	C37Bootstrapper.exe	28
PID 1580 wrote to memory of 2764	1580	C37Bootstrapper.exe	31
PID 1580 wrote to memory of 2764	1580	C37Bootstrapper.exe	31
PID 1580 wrote to memory of 2764	1580	C37Bootstrapper.exe	31
PID 1580 wrote to memory of 2692	1580	C37Bootstrapper.exe	33
PID 1580 wrote to memory of 2692	1580	C37Bootstrapper.exe	33
PID 1580 wrote to memory of 2692	1580	C37Bootstrapper.exe	33
PID 1580 wrote to memory of 2940	1580	C37Bootstrapper.exe	35
PID 1580 wrote to memory of 2940	1580	C37Bootstrapper.exe	35
PID 1580 wrote to memory of 2940	1580	C37Bootstrapper.exe	35
PID 1580 wrote to memory of 1032	1580	C37Bootstrapper.exe	37
PID 1580 wrote to memory of 1032	1580	C37Bootstrapper.exe	37
PID 1580 wrote to memory of 1032	1580	C37Bootstrapper.exe	37
PID 1580 wrote to memory of 1564	1580	C37Bootstrapper.exe	39
PID 1580 wrote to memory of 1564	1580	C37Bootstrapper.exe	39
PID 1580 wrote to memory of 1564	1580	C37Bootstrapper.exe	39
PID 1580 wrote to memory of 1436	1580	C37Bootstrapper.exe	41
PID 1580 wrote to memory of 1436	1580	C37Bootstrapper.exe	41
PID 1580 wrote to memory of 1436	1580	C37Bootstrapper.exe	41
PID 1580 wrote to memory of 276	1580	C37Bootstrapper.exe	43
PID 1580 wrote to memory of 276	1580	C37Bootstrapper.exe	43
PID 1580 wrote to memory of 276	1580	C37Bootstrapper.exe	43
PID 1580 wrote to memory of 2164	1580	C37Bootstrapper.exe	45
PID 1580 wrote to memory of 2164	1580	C37Bootstrapper.exe	45
PID 1580 wrote to memory of 2164	1580	C37Bootstrapper.exe	45
PID 1580 wrote to memory of 2820	1580	C37Bootstrapper.exe	47
PID 1580 wrote to memory of 2820	1580	C37Bootstrapper.exe	47
PID 1580 wrote to memory of 2820	1580	C37Bootstrapper.exe	47

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:1580
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2680
- 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:2764
- 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:2692
- 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:2940
- 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:1032
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1564
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:1436
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:276
- 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:2164
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:2820

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\Roaming\Microsoft\Windows\Recent\CustomDestinations\7M88HCOK7OWE8BIM874W.temp

Filesize
7KB

MD5
715d99a300d29002353caf6f3c2d02b3

SHA1
d42e755cc713feea511dfcf01fb0524677ea0aba

SHA256
6420d85b63fbc25d4ab3d953c1d57db8299c013f2a4c361f169c5ea733236023

SHA512
03973e39a7a9b48c190d7a5f3b51a2599e354802d28ed93dec4d235fa38037a59a31c91f9260f5c61152d89ba02d07912bfc1aecb060037d686e5c31cb7c6c96

Download Submit
memory/1580-0-0x000007FEF55F3000-0x000007FEF55F4000-memory.dmp

Filesize
4KB

Download
memory/1580-1-0x0000000000A20000-0x0000000000A8C000-memory.dmp

Filesize
432KB

Download
memory/1580-2-0x000007FEF55F0000-0x000007FEF5FDC000-memory.dmp

Filesize
9.9MB

Download
memory/1580-47-0x000007FEF55F0000-0x000007FEF5FDC000-memory.dmp

Filesize
9.9MB

Download
memory/2164-43-0x0000000001E10000-0x0000000001E18000-memory.dmp

Filesize
32KB

Download
memory/2692-15-0x0000000001D90000-0x0000000001D98000-memory.dmp

Filesize
32KB

Download
memory/2692-14-0x000000001B650000-0x000000001B932000-memory.dmp

Filesize
2.9MB

Download
memory/2764-7-0x000000001B6E0000-0x000000001B9C2000-memory.dmp

Filesize
2.9MB

Download
memory/2764-8-0x0000000002240000-0x0000000002248000-memory.dmp

Filesize
32KB

Download