umbral | 26deb9a0264cccfdef387610235e9e9032144c8e73561c3d0007c248a6c84dc3

Analysis

max time kernel
1357s
max time network
1175s
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 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
behavioral1/memory/4488-1-0x0000017BFE0C0000-0x0000017BFE12C000-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
3796	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
22	discord.com
23	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
5	ip-api.com

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
3424	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1220	PING.EXE

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
4488	C37Bootstrapper.exe
3796	powershell.exe
3796	powershell.exe
320	powershell.exe
320	powershell.exe
4728	powershell.exe
4728	powershell.exe
4124	powershell.exe
4124	powershell.exe
4224	powershell.exe
4224	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	4488	C37Bootstrapper.exe
Token: SeIncreaseQuotaPrivilege	3620	wmic.exe
Token: SeSecurityPrivilege	3620	wmic.exe
Token: SeTakeOwnershipPrivilege	3620	wmic.exe
Token: SeLoadDriverPrivilege	3620	wmic.exe
Token: SeSystemProfilePrivilege	3620	wmic.exe
Token: SeSystemtimePrivilege	3620	wmic.exe
Token: SeProfSingleProcessPrivilege	3620	wmic.exe
Token: SeIncBasePriorityPrivilege	3620	wmic.exe
Token: SeCreatePagefilePrivilege	3620	wmic.exe
Token: SeBackupPrivilege	3620	wmic.exe
Token: SeRestorePrivilege	3620	wmic.exe
Token: SeShutdownPrivilege	3620	wmic.exe
Token: SeDebugPrivilege	3620	wmic.exe
Token: SeSystemEnvironmentPrivilege	3620	wmic.exe
Token: SeRemoteShutdownPrivilege	3620	wmic.exe
Token: SeUndockPrivilege	3620	wmic.exe
Token: SeManageVolumePrivilege	3620	wmic.exe
Token: 33	3620	wmic.exe
Token: 34	3620	wmic.exe
Token: 35	3620	wmic.exe
Token: 36	3620	wmic.exe
Token: SeIncreaseQuotaPrivilege	3620	wmic.exe
Token: SeSecurityPrivilege	3620	wmic.exe
Token: SeTakeOwnershipPrivilege	3620	wmic.exe
Token: SeLoadDriverPrivilege	3620	wmic.exe
Token: SeSystemProfilePrivilege	3620	wmic.exe
Token: SeSystemtimePrivilege	3620	wmic.exe
Token: SeProfSingleProcessPrivilege	3620	wmic.exe
Token: SeIncBasePriorityPrivilege	3620	wmic.exe
Token: SeCreatePagefilePrivilege	3620	wmic.exe
Token: SeBackupPrivilege	3620	wmic.exe
Token: SeRestorePrivilege	3620	wmic.exe
Token: SeShutdownPrivilege	3620	wmic.exe
Token: SeDebugPrivilege	3620	wmic.exe
Token: SeSystemEnvironmentPrivilege	3620	wmic.exe
Token: SeRemoteShutdownPrivilege	3620	wmic.exe
Token: SeUndockPrivilege	3620	wmic.exe
Token: SeManageVolumePrivilege	3620	wmic.exe
Token: 33	3620	wmic.exe
Token: 34	3620	wmic.exe
Token: 35	3620	wmic.exe
Token: 36	3620	wmic.exe
Token: SeDebugPrivilege	3796	powershell.exe
Token: SeDebugPrivilege	320	powershell.exe
Token: SeDebugPrivilege	4728	powershell.exe
Token: SeDebugPrivilege	4124	powershell.exe
Token: SeIncreaseQuotaPrivilege	3336	wmic.exe
Token: SeSecurityPrivilege	3336	wmic.exe
Token: SeTakeOwnershipPrivilege	3336	wmic.exe
Token: SeLoadDriverPrivilege	3336	wmic.exe
Token: SeSystemProfilePrivilege	3336	wmic.exe
Token: SeSystemtimePrivilege	3336	wmic.exe
Token: SeProfSingleProcessPrivilege	3336	wmic.exe
Token: SeIncBasePriorityPrivilege	3336	wmic.exe
Token: SeCreatePagefilePrivilege	3336	wmic.exe
Token: SeBackupPrivilege	3336	wmic.exe
Token: SeRestorePrivilege	3336	wmic.exe
Token: SeShutdownPrivilege	3336	wmic.exe
Token: SeDebugPrivilege	3336	wmic.exe
Token: SeSystemEnvironmentPrivilege	3336	wmic.exe
Token: SeRemoteShutdownPrivilege	3336	wmic.exe
Token: SeUndockPrivilege	3336	wmic.exe
Token: SeManageVolumePrivilege	3336	wmic.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 4488 wrote to memory of 3620	4488	C37Bootstrapper.exe	82
PID 4488 wrote to memory of 3620	4488	C37Bootstrapper.exe	82
PID 4488 wrote to memory of 3684	4488	C37Bootstrapper.exe	87
PID 4488 wrote to memory of 3684	4488	C37Bootstrapper.exe	87
PID 4488 wrote to memory of 3796	4488	C37Bootstrapper.exe	89
PID 4488 wrote to memory of 3796	4488	C37Bootstrapper.exe	89
PID 4488 wrote to memory of 320	4488	C37Bootstrapper.exe	91
PID 4488 wrote to memory of 320	4488	C37Bootstrapper.exe	91
PID 4488 wrote to memory of 4728	4488	C37Bootstrapper.exe	93
PID 4488 wrote to memory of 4728	4488	C37Bootstrapper.exe	93
PID 4488 wrote to memory of 4124	4488	C37Bootstrapper.exe	95
PID 4488 wrote to memory of 4124	4488	C37Bootstrapper.exe	95
PID 4488 wrote to memory of 3336	4488	C37Bootstrapper.exe	97
PID 4488 wrote to memory of 3336	4488	C37Bootstrapper.exe	97
PID 4488 wrote to memory of 1784	4488	C37Bootstrapper.exe	99
PID 4488 wrote to memory of 1784	4488	C37Bootstrapper.exe	99
PID 4488 wrote to memory of 3652	4488	C37Bootstrapper.exe	101
PID 4488 wrote to memory of 3652	4488	C37Bootstrapper.exe	101
PID 4488 wrote to memory of 4224	4488	C37Bootstrapper.exe	103
PID 4488 wrote to memory of 4224	4488	C37Bootstrapper.exe	103
PID 4488 wrote to memory of 3424	4488	C37Bootstrapper.exe	107
PID 4488 wrote to memory of 3424	4488	C37Bootstrapper.exe	107
PID 4488 wrote to memory of 2320	4488	C37Bootstrapper.exe	110
PID 4488 wrote to memory of 2320	4488	C37Bootstrapper.exe	110
PID 2320 wrote to memory of 1220	2320	cmd.exe	112
PID 2320 wrote to memory of 1220	2320	cmd.exe	112

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
3684	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:4488
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3620
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\C37Bootstrapper.exe"
  2⤵
  - Views/modifies file attributes
  PID:3684
- 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:3796
- 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:320
- 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:4728
- 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:4124
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3336
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:1784
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:3652
- 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:4224
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:3424
- 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:2320
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - Runs ping.exe
    PID:1220

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
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

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

Filesize
944B

MD5
77d622bb1a5b250869a3238b9bc1402b

SHA1
d47f4003c2554b9dfc4c16f22460b331886b191b

SHA256
f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb

SHA512
d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

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

Filesize
948B

MD5
c523adc639d16ffb0f96cebc63eed858

SHA1
12ff3728fe7a266d00bea61357e168d1ac35fb8b

SHA256
3f3c9377b171cf14fcf2bfe2ef6ab7753c1470c8fe803fb73317fa3732c55df1

SHA512
36dd1d5df9f67a708087ae024f4088fbe6ed11859c65c896f4c7b40631e418646295078abe0bd1e7062b3dd5f333d8cf86a8542ef719e4b14feec877c60839ba

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

Filesize
1KB

MD5
88be3bc8a7f90e3953298c0fdbec4d72

SHA1
f4969784ad421cc80ef45608727aacd0f6bf2e4b

SHA256
533c8470b41084e40c5660569ebbdb7496520d449629a235e8053e84025f348a

SHA512
4fce64e2dacddbc03314048fef1ce356ee2647c14733da121c23c65507eeb8d721d6b690ad5463319b364dc4fa95904ad6ab096907f32918e3406ef438a6ef7c

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

Filesize
1KB

MD5
15dd61188e01dff83e0f47d441b21af5

SHA1
e26521b9eb5c21dd9b9bfb69618e7c80e4847bc9

SHA256
2f1d635b20401a13d3e43f797200c4b99d2dadbb1e01e6ab8cc5348783b193c6

SHA512
e40ad249392a90107d5448bee92ef45bf9164c2a106a39d2ea7b93ce22fce72af8a6732bac83fef32fbaefd915d51a0143c3e7409e74b17e0ce063c6d32100ed

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_nxvzcxo0.zym.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/3796-8-0x000002DDC8500000-0x000002DDC8522000-memory.dmp

Filesize
136KB

Download
memory/3796-14-0x00007FF91B6D0000-0x00007FF91C191000-memory.dmp

Filesize
10.8MB

Download
memory/3796-15-0x00007FF91B6D0000-0x00007FF91C191000-memory.dmp

Filesize
10.8MB

Download
memory/3796-18-0x00007FF91B6D0000-0x00007FF91C191000-memory.dmp

Filesize
10.8MB

Download
memory/3796-13-0x00007FF91B6D0000-0x00007FF91C191000-memory.dmp

Filesize
10.8MB

Download
memory/4224-86-0x0000028EE09D0000-0x0000028EE0A18000-memory.dmp

Filesize
288KB

Download
memory/4488-34-0x0000017BFFD70000-0x0000017BFFDC0000-memory.dmp

Filesize
320KB

Download
memory/4488-35-0x0000017BFE4E0000-0x0000017BFE4FE000-memory.dmp

Filesize
120KB

Download
memory/4488-1-0x0000017BFE0C0000-0x0000017BFE12C000-memory.dmp

Filesize
432KB

Download
memory/4488-0-0x00007FF91B6D3000-0x00007FF91B6D5000-memory.dmp

Filesize
8KB

Download
memory/4488-71-0x0000017BFE4D0000-0x0000017BFE4DA000-memory.dmp

Filesize
40KB

Download
memory/4488-72-0x0000017BFE520000-0x0000017BFE532000-memory.dmp

Filesize
72KB

Download
memory/4488-33-0x0000017BFFCF0000-0x0000017BFFD66000-memory.dmp

Filesize
472KB

Download
memory/4488-2-0x00007FF91B6D0000-0x00007FF91C191000-memory.dmp

Filesize
10.8MB

Download
memory/4488-91-0x00007FF91B6D0000-0x00007FF91C191000-memory.dmp

Filesize
10.8MB

Download