umbral | 26deb9a0264cccfdef387610235e9e9032144c8e73561c3d0007c248a6c84dc3

Analysis

max time kernel
1482s
max time network
1496s
platform
windows11-21h2_x64
resource
win11-20240508-en
resource tags

arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
submitted
05-06-2024 16:11

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General

Target

C37Bootstrapper.exe
Size

405KB
MD5

c8294556e29920bfcc619529da141096
SHA1

7dad1b482c1d3baeade911400027e615e2ea52ff
SHA256

26deb9a0264cccfdef387610235e9e9032144c8e73561c3d0007c248a6c84dc3
SHA512

1ac29a6ecdf761d85d3b1b64910f7edd865238d1d6b159532efb8260fa9af35c7db06892359ba9efe7bd571ec2bd259a0621721666fd5b085e92f68848f63af6
SSDEEP

6144:nloZM+rIkd8g+EtXHkv/iD4w85EFzQEb3CzFQMpFlb8e1mBiEqkRH:loZtL+EP8w85EFzQEb3CzFQMpfvEJ

Score

10^/10

umbral execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral2/memory/3984-0-0x000001C08F4F0000-0x000001C08F55C000-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
2156	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
1	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
3776	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
4588	PING.EXE

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
3984	C37Bootstrapper.exe
2156	powershell.exe
2156	powershell.exe
3748	powershell.exe
3748	powershell.exe
3588	powershell.exe
3588	powershell.exe
1640	powershell.exe
1640	powershell.exe
1920	powershell.exe
1920	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	3984	C37Bootstrapper.exe
Token: SeIncreaseQuotaPrivilege	3780	wmic.exe
Token: SeSecurityPrivilege	3780	wmic.exe
Token: SeTakeOwnershipPrivilege	3780	wmic.exe
Token: SeLoadDriverPrivilege	3780	wmic.exe
Token: SeSystemProfilePrivilege	3780	wmic.exe
Token: SeSystemtimePrivilege	3780	wmic.exe
Token: SeProfSingleProcessPrivilege	3780	wmic.exe
Token: SeIncBasePriorityPrivilege	3780	wmic.exe
Token: SeCreatePagefilePrivilege	3780	wmic.exe
Token: SeBackupPrivilege	3780	wmic.exe
Token: SeRestorePrivilege	3780	wmic.exe
Token: SeShutdownPrivilege	3780	wmic.exe
Token: SeDebugPrivilege	3780	wmic.exe
Token: SeSystemEnvironmentPrivilege	3780	wmic.exe
Token: SeRemoteShutdownPrivilege	3780	wmic.exe
Token: SeUndockPrivilege	3780	wmic.exe
Token: SeManageVolumePrivilege	3780	wmic.exe
Token: 33	3780	wmic.exe
Token: 34	3780	wmic.exe
Token: 35	3780	wmic.exe
Token: 36	3780	wmic.exe
Token: SeIncreaseQuotaPrivilege	3780	wmic.exe
Token: SeSecurityPrivilege	3780	wmic.exe
Token: SeTakeOwnershipPrivilege	3780	wmic.exe
Token: SeLoadDriverPrivilege	3780	wmic.exe
Token: SeSystemProfilePrivilege	3780	wmic.exe
Token: SeSystemtimePrivilege	3780	wmic.exe
Token: SeProfSingleProcessPrivilege	3780	wmic.exe
Token: SeIncBasePriorityPrivilege	3780	wmic.exe
Token: SeCreatePagefilePrivilege	3780	wmic.exe
Token: SeBackupPrivilege	3780	wmic.exe
Token: SeRestorePrivilege	3780	wmic.exe
Token: SeShutdownPrivilege	3780	wmic.exe
Token: SeDebugPrivilege	3780	wmic.exe
Token: SeSystemEnvironmentPrivilege	3780	wmic.exe
Token: SeRemoteShutdownPrivilege	3780	wmic.exe
Token: SeUndockPrivilege	3780	wmic.exe
Token: SeManageVolumePrivilege	3780	wmic.exe
Token: 33	3780	wmic.exe
Token: 34	3780	wmic.exe
Token: 35	3780	wmic.exe
Token: 36	3780	wmic.exe
Token: SeDebugPrivilege	2156	powershell.exe
Token: SeDebugPrivilege	3748	powershell.exe
Token: SeDebugPrivilege	3588	powershell.exe
Token: SeDebugPrivilege	1640	powershell.exe
Token: SeIncreaseQuotaPrivilege	1084	wmic.exe
Token: SeSecurityPrivilege	1084	wmic.exe
Token: SeTakeOwnershipPrivilege	1084	wmic.exe
Token: SeLoadDriverPrivilege	1084	wmic.exe
Token: SeSystemProfilePrivilege	1084	wmic.exe
Token: SeSystemtimePrivilege	1084	wmic.exe
Token: SeProfSingleProcessPrivilege	1084	wmic.exe
Token: SeIncBasePriorityPrivilege	1084	wmic.exe
Token: SeCreatePagefilePrivilege	1084	wmic.exe
Token: SeBackupPrivilege	1084	wmic.exe
Token: SeRestorePrivilege	1084	wmic.exe
Token: SeShutdownPrivilege	1084	wmic.exe
Token: SeDebugPrivilege	1084	wmic.exe
Token: SeSystemEnvironmentPrivilege	1084	wmic.exe
Token: SeRemoteShutdownPrivilege	1084	wmic.exe
Token: SeUndockPrivilege	1084	wmic.exe
Token: SeManageVolumePrivilege	1084	wmic.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 3984 wrote to memory of 3780	3984	C37Bootstrapper.exe	81
PID 3984 wrote to memory of 3780	3984	C37Bootstrapper.exe	81
PID 3984 wrote to memory of 4920	3984	C37Bootstrapper.exe	84
PID 3984 wrote to memory of 4920	3984	C37Bootstrapper.exe	84
PID 3984 wrote to memory of 2156	3984	C37Bootstrapper.exe	86
PID 3984 wrote to memory of 2156	3984	C37Bootstrapper.exe	86
PID 3984 wrote to memory of 3748	3984	C37Bootstrapper.exe	88
PID 3984 wrote to memory of 3748	3984	C37Bootstrapper.exe	88
PID 3984 wrote to memory of 3588	3984	C37Bootstrapper.exe	90
PID 3984 wrote to memory of 3588	3984	C37Bootstrapper.exe	90
PID 3984 wrote to memory of 1640	3984	C37Bootstrapper.exe	92
PID 3984 wrote to memory of 1640	3984	C37Bootstrapper.exe	92
PID 3984 wrote to memory of 1084	3984	C37Bootstrapper.exe	94
PID 3984 wrote to memory of 1084	3984	C37Bootstrapper.exe	94
PID 3984 wrote to memory of 4268	3984	C37Bootstrapper.exe	96
PID 3984 wrote to memory of 4268	3984	C37Bootstrapper.exe	96
PID 3984 wrote to memory of 1828	3984	C37Bootstrapper.exe	98
PID 3984 wrote to memory of 1828	3984	C37Bootstrapper.exe	98
PID 3984 wrote to memory of 1920	3984	C37Bootstrapper.exe	100
PID 3984 wrote to memory of 1920	3984	C37Bootstrapper.exe	100
PID 3984 wrote to memory of 3776	3984	C37Bootstrapper.exe	102
PID 3984 wrote to memory of 3776	3984	C37Bootstrapper.exe	102
PID 3984 wrote to memory of 232	3984	C37Bootstrapper.exe	104
PID 3984 wrote to memory of 232	3984	C37Bootstrapper.exe	104
PID 232 wrote to memory of 4588	232	cmd.exe	106
PID 232 wrote to memory of 4588	232	cmd.exe	106

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
4920	attrib.exe

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:3984
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3780
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\C37Bootstrapper.exe"
  2⤵
  - Views/modifies file attributes
  PID:4920
- 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:2156
- 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:3748
- 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:3588
- 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:1640
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1084
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:4268
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1828
- 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:1920
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:3776
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\C37Bootstrapper.exe" && pause
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:232
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - Runs ping.exe
    PID:4588

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

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
627073ee3ca9676911bee35548eff2b8

SHA1
4c4b68c65e2cab9864b51167d710aa29ebdcff2e

SHA256
85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

SHA512
3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

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

Filesize
944B

MD5
aa4f31835d07347297d35862c9045f4a

SHA1
83e728008935d30f98e5480fba4fbccf10cefb05

SHA256
99c83bc5c531e49d4240700142f3425aba74e18ebcc23556be32238ffde9cce0

SHA512
ec3a4bee8335007b8753ae8ac42287f2b3bcbb258f7fc3fb15c9f8d3e611cb9bf6ae2d3034953286a34f753e9ec33f7495e064bab0e8c7fcedd75d6e5eb66629

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

Filesize
948B

MD5
fa21dd50b4e64421076f843031c8ccf7

SHA1
2c56e94f130c0d8d77116e939ffee4e37cf982bd

SHA256
e4f21aca1e12aafa8de7af24b79a75526e902c7d4b3fea5bdb6e723976997be3

SHA512
b8de2bfeb7af06c587dd1f424d410cf83471f31a55a3ea4c4481ce07ffd9bf66ddc1f7775ecd6ac65ac33baaec90ba5a208a9aefc84f31125a50dfb919982687

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
6954f218ba4c7d0fe9cbf31e88fe3a69

SHA1
f6f26b65a7892fdcd1372dedbbb1a7fdd2b1db88

SHA256
b33cf6e9bb2ceccfb71165bcb40fa340fde43da503d3a4443d03aeddf28832e4

SHA512
e7f2aec7ef1cb35c37c8fd0d3d012a66c8aaaefc92c7975fb5597760730c9909dac76961aea6b19844863e90f992b9936efd6cf519fbc971668a86f34c1d0744

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_qle3icmb.quc.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2156-4-0x00007FFF13FF0000-0x00007FFF14AB2000-memory.dmp

Filesize
10.8MB

Download
memory/2156-13-0x000001EE3B030000-0x000001EE3B052000-memory.dmp

Filesize
136KB

Download
memory/2156-14-0x00007FFF13FF0000-0x00007FFF14AB2000-memory.dmp

Filesize
10.8MB

Download
memory/2156-17-0x00007FFF13FF0000-0x00007FFF14AB2000-memory.dmp

Filesize
10.8MB

Download
memory/2156-3-0x00007FFF13FF0000-0x00007FFF14AB2000-memory.dmp

Filesize
10.8MB

Download
memory/3984-32-0x000001C0A9DA0000-0x000001C0A9DF0000-memory.dmp

Filesize
320KB

Download
memory/3984-31-0x000001C0A9D20000-0x000001C0A9D96000-memory.dmp

Filesize
472KB

Download
memory/3984-33-0x000001C08FA80000-0x000001C08FA9E000-memory.dmp

Filesize
120KB

Download
memory/3984-0-0x000001C08F4F0000-0x000001C08F55C000-memory.dmp

Filesize
432KB

Download
memory/3984-1-0x00007FFF13FF3000-0x00007FFF13FF5000-memory.dmp

Filesize
8KB

Download
memory/3984-67-0x000001C0A9CA0000-0x000001C0A9CAA000-memory.dmp

Filesize
40KB

Download
memory/3984-68-0x000001C0A9CD0000-0x000001C0A9CE2000-memory.dmp

Filesize
72KB

Download
memory/3984-2-0x00007FFF13FF0000-0x00007FFF14AB2000-memory.dmp

Filesize
10.8MB

Download
memory/3984-85-0x00007FFF13FF0000-0x00007FFF14AB2000-memory.dmp

Filesize
10.8MB

Download