umbral | 18d2df2e1cc1bd1e7192f036d0d3a2d1b0d9e9918982597fb7482b87f6cebfc7

Analysis

max time kernel
102s
max time network
122s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20250113-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20250113-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
15-01-2025 02:05

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General

Target

VenomServer.exe
Size

229KB
MD5

8592e87c9ce0b16668abffac801541f8
SHA1

fd01f9543021891177b974b1f14f97ab332b2f7f
SHA256

18d2df2e1cc1bd1e7192f036d0d3a2d1b0d9e9918982597fb7482b87f6cebfc7
SHA512

2f817da7154f98dccf0f683245ad06d71f31bfcc77db707f195d229cb1834686ead2df96fb106701de4d4df0b365704d0370b88fce9471048a4b80f1d5ec9592
SSDEEP

6144:tloZM+rIkd8g+EtXHkv/iD4qUWicCFdWNj+ctBI9Pb8e1mti:voZtL+EP8qUWicCFdWNj+ctBIB3

Score

10^/10

umbral discovery execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/1016-1-0x000001EE56310000-0x000001EE56350000-memory.dmp	family_umbral

Umbral
Umbral stealer is an opensource moduler stealer written in C#.
stealer umbral
Umbral family
umbral

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
4372	powershell.exe
3712	powershell.exe
4464	powershell.exe
2644	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	VenomServer.exe

Reads user/profile data of web browsers 3 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

Credentials from Web Browsers
T1555.003

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
13	discord.com
14	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
3	ip-api.com

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
664	cmd.exe
1000	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
4024	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1000	PING.EXE

Suspicious behavior: EnumeratesProcesses 31 IoCs

pid	Process
2528	wmic.exe
2528	wmic.exe
2528	wmic.exe
2528	wmic.exe
1016	VenomServer.exe
4372	powershell.exe
4372	powershell.exe
3712	powershell.exe
3712	powershell.exe
4464	powershell.exe
4464	powershell.exe
5000	powershell.exe
5000	powershell.exe
3632	wmic.exe
3632	wmic.exe
3632	wmic.exe
3632	wmic.exe
4228	wmic.exe
4228	wmic.exe
4228	wmic.exe
4228	wmic.exe
3116	wmic.exe
3116	wmic.exe
3116	wmic.exe
3116	wmic.exe
2644	powershell.exe
2644	powershell.exe
4024	wmic.exe
4024	wmic.exe
4024	wmic.exe
4024	wmic.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	1016	VenomServer.exe
Token: SeIncreaseQuotaPrivilege	2528	wmic.exe
Token: SeSecurityPrivilege	2528	wmic.exe
Token: SeTakeOwnershipPrivilege	2528	wmic.exe
Token: SeLoadDriverPrivilege	2528	wmic.exe
Token: SeSystemProfilePrivilege	2528	wmic.exe
Token: SeSystemtimePrivilege	2528	wmic.exe
Token: SeProfSingleProcessPrivilege	2528	wmic.exe
Token: SeIncBasePriorityPrivilege	2528	wmic.exe
Token: SeCreatePagefilePrivilege	2528	wmic.exe
Token: SeBackupPrivilege	2528	wmic.exe
Token: SeRestorePrivilege	2528	wmic.exe
Token: SeShutdownPrivilege	2528	wmic.exe
Token: SeDebugPrivilege	2528	wmic.exe
Token: SeSystemEnvironmentPrivilege	2528	wmic.exe
Token: SeRemoteShutdownPrivilege	2528	wmic.exe
Token: SeUndockPrivilege	2528	wmic.exe
Token: SeManageVolumePrivilege	2528	wmic.exe
Token: 33	2528	wmic.exe
Token: 34	2528	wmic.exe
Token: 35	2528	wmic.exe
Token: 36	2528	wmic.exe
Token: SeIncreaseQuotaPrivilege	2528	wmic.exe
Token: SeSecurityPrivilege	2528	wmic.exe
Token: SeTakeOwnershipPrivilege	2528	wmic.exe
Token: SeLoadDriverPrivilege	2528	wmic.exe
Token: SeSystemProfilePrivilege	2528	wmic.exe
Token: SeSystemtimePrivilege	2528	wmic.exe
Token: SeProfSingleProcessPrivilege	2528	wmic.exe
Token: SeIncBasePriorityPrivilege	2528	wmic.exe
Token: SeCreatePagefilePrivilege	2528	wmic.exe
Token: SeBackupPrivilege	2528	wmic.exe
Token: SeRestorePrivilege	2528	wmic.exe
Token: SeShutdownPrivilege	2528	wmic.exe
Token: SeDebugPrivilege	2528	wmic.exe
Token: SeSystemEnvironmentPrivilege	2528	wmic.exe
Token: SeRemoteShutdownPrivilege	2528	wmic.exe
Token: SeUndockPrivilege	2528	wmic.exe
Token: SeManageVolumePrivilege	2528	wmic.exe
Token: 33	2528	wmic.exe
Token: 34	2528	wmic.exe
Token: 35	2528	wmic.exe
Token: 36	2528	wmic.exe
Token: SeDebugPrivilege	4372	powershell.exe
Token: SeIncreaseQuotaPrivilege	4372	powershell.exe
Token: SeSecurityPrivilege	4372	powershell.exe
Token: SeTakeOwnershipPrivilege	4372	powershell.exe
Token: SeLoadDriverPrivilege	4372	powershell.exe
Token: SeSystemProfilePrivilege	4372	powershell.exe
Token: SeSystemtimePrivilege	4372	powershell.exe
Token: SeProfSingleProcessPrivilege	4372	powershell.exe
Token: SeIncBasePriorityPrivilege	4372	powershell.exe
Token: SeCreatePagefilePrivilege	4372	powershell.exe
Token: SeBackupPrivilege	4372	powershell.exe
Token: SeRestorePrivilege	4372	powershell.exe
Token: SeShutdownPrivilege	4372	powershell.exe
Token: SeDebugPrivilege	4372	powershell.exe
Token: SeSystemEnvironmentPrivilege	4372	powershell.exe
Token: SeRemoteShutdownPrivilege	4372	powershell.exe
Token: SeUndockPrivilege	4372	powershell.exe
Token: SeManageVolumePrivilege	4372	powershell.exe
Token: 33	4372	powershell.exe
Token: 34	4372	powershell.exe
Token: 35	4372	powershell.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 1016 wrote to memory of 2528	1016	VenomServer.exe	83
PID 1016 wrote to memory of 2528	1016	VenomServer.exe	83
PID 1016 wrote to memory of 2128	1016	VenomServer.exe	86
PID 1016 wrote to memory of 2128	1016	VenomServer.exe	86
PID 1016 wrote to memory of 4372	1016	VenomServer.exe	88
PID 1016 wrote to memory of 4372	1016	VenomServer.exe	88
PID 1016 wrote to memory of 3712	1016	VenomServer.exe	92
PID 1016 wrote to memory of 3712	1016	VenomServer.exe	92
PID 1016 wrote to memory of 4464	1016	VenomServer.exe	94
PID 1016 wrote to memory of 4464	1016	VenomServer.exe	94
PID 1016 wrote to memory of 5000	1016	VenomServer.exe	96
PID 1016 wrote to memory of 5000	1016	VenomServer.exe	96
PID 1016 wrote to memory of 3632	1016	VenomServer.exe	98
PID 1016 wrote to memory of 3632	1016	VenomServer.exe	98
PID 1016 wrote to memory of 4228	1016	VenomServer.exe	100
PID 1016 wrote to memory of 4228	1016	VenomServer.exe	100
PID 1016 wrote to memory of 3116	1016	VenomServer.exe	102
PID 1016 wrote to memory of 3116	1016	VenomServer.exe	102
PID 1016 wrote to memory of 2644	1016	VenomServer.exe	104
PID 1016 wrote to memory of 2644	1016	VenomServer.exe	104
PID 1016 wrote to memory of 4024	1016	VenomServer.exe	106
PID 1016 wrote to memory of 4024	1016	VenomServer.exe	106
PID 1016 wrote to memory of 664	1016	VenomServer.exe	108
PID 1016 wrote to memory of 664	1016	VenomServer.exe	108
PID 664 wrote to memory of 1000	664	cmd.exe	110
PID 664 wrote to memory of 1000	664	cmd.exe	110

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2128	attrib.exe

C:\Users\Admin\AppData\Local\Temp\VenomServer.exe
"C:\Users\Admin\AppData\Local\Temp\VenomServer.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1016
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2528
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\VenomServer.exe"
  2⤵
  - Views/modifies file attributes
  PID:2128
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\VenomServer.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4372
- 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⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  PID:3712
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  PID:4464
- 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
  PID:5000
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:3632
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:4228
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:3116
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  PID:2644
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  - Suspicious behavior: EnumeratesProcesses
  PID:4024
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\VenomServer.exe" && pause
  2⤵
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:664
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:1000

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

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

System Network Configuration Discovery

T1016

Internet Connection Discovery

T1016.001

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
3KB

MD5
3eb3833f769dd890afc295b977eab4b4

SHA1
e857649b037939602c72ad003e5d3698695f436f

SHA256
c485a6e2fd17c342fca60060f47d6a5655a65a412e35e001bb5bf88d96e6e485

SHA512
c24bbc8f278478d43756807b8c584d4e3fb2289db468bc92986a489f74a8da386a667a758360a397e77e018e363be8912ac260072fa3e31117ad0599ac749e72

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

Filesize
1KB

MD5
f0f59cccd39a3694e0e6dfd44d0fa76d

SHA1
fccd7911d463041e1168431df8823e4c4ea387c1

SHA256
70466c7f3a911368d653396fdd68f993322c69e1797b492ca00f8be34b7f3401

SHA512
5c726e1e28cb9c0c3ab963fbfbf471c6033839f3e535a3811581fdaa4da17175e5a8a8be84a4fccd99b81e048058e51d230ff3836e3ec920057a1b1676110bee

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

Filesize
948B

MD5
7f0ee639f176bf13175ee6567fb1a2a9

SHA1
c57e31687ef5b0172381caa0e795cb01addc0a36

SHA256
499275ee7487b41e1187ab5f2aefa4791424aedc729f2c46159db46d553da467

SHA512
f9eb5f6fa1d71e9196f270da0f3087d96fe6e4bfe7ad20cc1832c24b489db91eb44ab322c974fca5fcfba02268bdcce572c6b15aa78cc2e76ed1f7f64db56573

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

Filesize
1KB

MD5
8e1fdd1b66d2fee9f6a052524d4ddca5

SHA1
0a9d0994559d1be2eecd8b0d6960540ca627bdb6

SHA256
4cc7c1b79d1b48582d4dc27ca8c31457b9bf2441deb7914399bb9e6863f18b13

SHA512
5a5494b878b08e8515811ab7a3d68780dac7423f5562477d98249a8bedf7ec98567b7cd5d4c6967d6bc63f2d6d9b7da9a65e0eb29d4b955026b469b5b598d1f3

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

Filesize
1KB

MD5
02d930b2fcd334336e013d69909ad12c

SHA1
04d1595d0a7a1a1870e1ba4706dd902aa27107c5

SHA256
df394101863166ecc6f997eaff7b3cec6982430e153cf3b4ac0e746cc80d8bdb

SHA512
b88d415b79c1c5f5371318d27613a5f7f5a3b9010d80f06a2edd0b572acb4a64b018ec9e92e0f5a9fce7a947b47b9f8e8165c2eca2b7a9e4249844270f5e4474

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_xpr1hbb4.xx2.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1016-58-0x000001EE707B0000-0x000001EE707BA000-memory.dmp

Filesize
40KB

Download
memory/1016-34-0x000001EE70770000-0x000001EE7078E000-memory.dmp

Filesize
120KB

Download
memory/1016-78-0x00007FFE6DA70000-0x00007FFE6E532000-memory.dmp

Filesize
10.8MB

Download
memory/1016-74-0x00007FFE6DA70000-0x00007FFE6E532000-memory.dmp

Filesize
10.8MB

Download
memory/1016-2-0x00007FFE6DA70000-0x00007FFE6E532000-memory.dmp

Filesize
10.8MB

Download
memory/1016-32-0x000001EE70A80000-0x000001EE70AF6000-memory.dmp

Filesize
472KB

Download
memory/1016-33-0x000001EE707C0000-0x000001EE70810000-memory.dmp

Filesize
320KB

Download
memory/1016-59-0x000001EE70C00000-0x000001EE70C12000-memory.dmp

Filesize
72KB

Download
memory/1016-1-0x000001EE56310000-0x000001EE56350000-memory.dmp

Filesize
256KB

Download
memory/1016-0-0x00007FFE6DA73000-0x00007FFE6DA75000-memory.dmp

Filesize
8KB

Download
memory/4372-12-0x000001FEF4CF0000-0x000001FEF4D12000-memory.dmp

Filesize
136KB

Download
memory/4372-15-0x00007FFE6DA70000-0x00007FFE6E532000-memory.dmp

Filesize
10.8MB

Download
memory/4372-13-0x00007FFE6DA70000-0x00007FFE6E532000-memory.dmp

Filesize
10.8MB

Download
memory/4372-14-0x00007FFE6DA70000-0x00007FFE6E532000-memory.dmp

Filesize
10.8MB

Download
memory/4372-18-0x00007FFE6DA70000-0x00007FFE6E532000-memory.dmp

Filesize
10.8MB

Download