umbral | b5015182ecaa7561f27090fb7b2aab0decbbffc94606225b12676dc720266498

Analysis

max time kernel
122s
max time network
123s
platform
windows7_x64
resource
win7-20240508-en
resource tags

arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system
submitted
05-06-2024 17:57

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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/2964-1-0x00000000008D0000-0x000000000093C000-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
2808	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
308	wmic.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2964	C37Bootstrapper.exe
2808	powershell.exe
2812	powershell.exe
2564	powershell.exe
2772	powershell.exe
1036	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2964	C37Bootstrapper.exe
Token: SeIncreaseQuotaPrivilege	2128	wmic.exe
Token: SeSecurityPrivilege	2128	wmic.exe
Token: SeTakeOwnershipPrivilege	2128	wmic.exe
Token: SeLoadDriverPrivilege	2128	wmic.exe
Token: SeSystemProfilePrivilege	2128	wmic.exe
Token: SeSystemtimePrivilege	2128	wmic.exe
Token: SeProfSingleProcessPrivilege	2128	wmic.exe
Token: SeIncBasePriorityPrivilege	2128	wmic.exe
Token: SeCreatePagefilePrivilege	2128	wmic.exe
Token: SeBackupPrivilege	2128	wmic.exe
Token: SeRestorePrivilege	2128	wmic.exe
Token: SeShutdownPrivilege	2128	wmic.exe
Token: SeDebugPrivilege	2128	wmic.exe
Token: SeSystemEnvironmentPrivilege	2128	wmic.exe
Token: SeRemoteShutdownPrivilege	2128	wmic.exe
Token: SeUndockPrivilege	2128	wmic.exe
Token: SeManageVolumePrivilege	2128	wmic.exe
Token: 33	2128	wmic.exe
Token: 34	2128	wmic.exe
Token: 35	2128	wmic.exe
Token: SeIncreaseQuotaPrivilege	2128	wmic.exe
Token: SeSecurityPrivilege	2128	wmic.exe
Token: SeTakeOwnershipPrivilege	2128	wmic.exe
Token: SeLoadDriverPrivilege	2128	wmic.exe
Token: SeSystemProfilePrivilege	2128	wmic.exe
Token: SeSystemtimePrivilege	2128	wmic.exe
Token: SeProfSingleProcessPrivilege	2128	wmic.exe
Token: SeIncBasePriorityPrivilege	2128	wmic.exe
Token: SeCreatePagefilePrivilege	2128	wmic.exe
Token: SeBackupPrivilege	2128	wmic.exe
Token: SeRestorePrivilege	2128	wmic.exe
Token: SeShutdownPrivilege	2128	wmic.exe
Token: SeDebugPrivilege	2128	wmic.exe
Token: SeSystemEnvironmentPrivilege	2128	wmic.exe
Token: SeRemoteShutdownPrivilege	2128	wmic.exe
Token: SeUndockPrivilege	2128	wmic.exe
Token: SeManageVolumePrivilege	2128	wmic.exe
Token: 33	2128	wmic.exe
Token: 34	2128	wmic.exe
Token: 35	2128	wmic.exe
Token: SeDebugPrivilege	2808	powershell.exe
Token: SeDebugPrivilege	2812	powershell.exe
Token: SeDebugPrivilege	2564	powershell.exe
Token: SeDebugPrivilege	2772	powershell.exe
Token: SeIncreaseQuotaPrivilege	3004	wmic.exe
Token: SeSecurityPrivilege	3004	wmic.exe
Token: SeTakeOwnershipPrivilege	3004	wmic.exe
Token: SeLoadDriverPrivilege	3004	wmic.exe
Token: SeSystemProfilePrivilege	3004	wmic.exe
Token: SeSystemtimePrivilege	3004	wmic.exe
Token: SeProfSingleProcessPrivilege	3004	wmic.exe
Token: SeIncBasePriorityPrivilege	3004	wmic.exe
Token: SeCreatePagefilePrivilege	3004	wmic.exe
Token: SeBackupPrivilege	3004	wmic.exe
Token: SeRestorePrivilege	3004	wmic.exe
Token: SeShutdownPrivilege	3004	wmic.exe
Token: SeDebugPrivilege	3004	wmic.exe
Token: SeSystemEnvironmentPrivilege	3004	wmic.exe
Token: SeRemoteShutdownPrivilege	3004	wmic.exe
Token: SeUndockPrivilege	3004	wmic.exe
Token: SeManageVolumePrivilege	3004	wmic.exe
Token: 33	3004	wmic.exe
Token: 34	3004	wmic.exe

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2964 wrote to memory of 2128	2964	C37Bootstrapper.exe	28
PID 2964 wrote to memory of 2128	2964	C37Bootstrapper.exe	28
PID 2964 wrote to memory of 2128	2964	C37Bootstrapper.exe	28
PID 2964 wrote to memory of 2808	2964	C37Bootstrapper.exe	31
PID 2964 wrote to memory of 2808	2964	C37Bootstrapper.exe	31
PID 2964 wrote to memory of 2808	2964	C37Bootstrapper.exe	31
PID 2964 wrote to memory of 2812	2964	C37Bootstrapper.exe	33
PID 2964 wrote to memory of 2812	2964	C37Bootstrapper.exe	33
PID 2964 wrote to memory of 2812	2964	C37Bootstrapper.exe	33
PID 2964 wrote to memory of 2564	2964	C37Bootstrapper.exe	35
PID 2964 wrote to memory of 2564	2964	C37Bootstrapper.exe	35
PID 2964 wrote to memory of 2564	2964	C37Bootstrapper.exe	35
PID 2964 wrote to memory of 2772	2964	C37Bootstrapper.exe	37
PID 2964 wrote to memory of 2772	2964	C37Bootstrapper.exe	37
PID 2964 wrote to memory of 2772	2964	C37Bootstrapper.exe	37
PID 2964 wrote to memory of 3004	2964	C37Bootstrapper.exe	39
PID 2964 wrote to memory of 3004	2964	C37Bootstrapper.exe	39
PID 2964 wrote to memory of 3004	2964	C37Bootstrapper.exe	39
PID 2964 wrote to memory of 1828	2964	C37Bootstrapper.exe	41
PID 2964 wrote to memory of 1828	2964	C37Bootstrapper.exe	41
PID 2964 wrote to memory of 1828	2964	C37Bootstrapper.exe	41
PID 2964 wrote to memory of 1032	2964	C37Bootstrapper.exe	43
PID 2964 wrote to memory of 1032	2964	C37Bootstrapper.exe	43
PID 2964 wrote to memory of 1032	2964	C37Bootstrapper.exe	43
PID 2964 wrote to memory of 1036	2964	C37Bootstrapper.exe	45
PID 2964 wrote to memory of 1036	2964	C37Bootstrapper.exe	45
PID 2964 wrote to memory of 1036	2964	C37Bootstrapper.exe	45
PID 2964 wrote to memory of 308	2964	C37Bootstrapper.exe	47
PID 2964 wrote to memory of 308	2964	C37Bootstrapper.exe	47
PID 2964 wrote to memory of 308	2964	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:2964
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2128
- 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:2808
- 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:2812
- 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:2564
- 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:2772
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3004
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:1828
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1032
- 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:1036
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:308

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\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
75cb4f228666216860330eb87dfbcb93

SHA1
4dd851dfae30c7fdceb3e8b31f0f7b2a9f7fc460

SHA256
bd30845d111b8cc4113e62ed6b60dc667386ef0e63955e56f151bd79315321a3

SHA512
b1c071f45f29139aabfdae8fa2903e520388e9001a618949dc0bf2ff76be2533072be3adafd58344ed1e332941cf0757debabe8185c494f79a3dd7dfe78b7f7b

Download Submit
memory/1036-42-0x0000000002340000-0x0000000002348000-memory.dmp

Filesize
32KB

Download
memory/2808-7-0x000000001B690000-0x000000001B972000-memory.dmp

Filesize
2.9MB

Download
memory/2808-8-0x0000000001EC0000-0x0000000001EC8000-memory.dmp

Filesize
32KB

Download
memory/2812-14-0x000000001B4D0000-0x000000001B7B2000-memory.dmp

Filesize
2.9MB

Download
memory/2812-15-0x0000000001E70000-0x0000000001E78000-memory.dmp

Filesize
32KB

Download
memory/2964-0-0x000007FEF5E43000-0x000007FEF5E44000-memory.dmp

Filesize
4KB

Download
memory/2964-1-0x00000000008D0000-0x000000000093C000-memory.dmp

Filesize
432KB

Download
memory/2964-2-0x000007FEF5E40000-0x000007FEF682C000-memory.dmp

Filesize
9.9MB

Download
memory/2964-46-0x000007FEF5E40000-0x000007FEF682C000-memory.dmp

Filesize
9.9MB

Download