umbral | 2464cc00fd3a0e7b5fd2e171e967b2ef65fde94bff68dda2dab12e2b9dce108d

Analysis

max time kernel
98s
max time network
141s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20241023-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
30-11-2024 08:51

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General

Target

octosint.exe
Size

628KB
MD5

b4effaa19b06eb4a92b66b0ff2702c91
SHA1

703aa3cec640517f6e51033c27bef4bbeb9afe9b
SHA256

2464cc00fd3a0e7b5fd2e171e967b2ef65fde94bff68dda2dab12e2b9dce108d
SHA512

d7e379b2148dc4697e7cd1529ef88bc5386f66df992afcb4423b4f24a7402b18531aee341c3dc22fe97d37583d7856a13cd1cdbeb341b042f0b547f485e09cd8
SSDEEP

12288:2oZtL+EP8GwI8EKtFu9r20VJg2VFRiMdRC:qI8fI8EKtFu9r20VJg2hiMdA

Score

10^/10

umbral discovery execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/764-1-0x000002A8C5860000-0x000002A8C5904000-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
3620	powershell.exe
2720	powershell.exe
4232	powershell.exe
4604	powershell.exe

Drops file in Drivers directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\drivers\etc\hosts	octosint.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
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
6	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
4748	cmd.exe
1916	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
856	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1916	PING.EXE

Suspicious behavior: EnumeratesProcesses 31 IoCs

pid	Process
4876	wmic.exe
4876	wmic.exe
4876	wmic.exe
4876	wmic.exe
764	octosint.exe
3620	powershell.exe
3620	powershell.exe
2720	powershell.exe
2720	powershell.exe
4232	powershell.exe
4232	powershell.exe
2848	powershell.exe
2848	powershell.exe
4972	wmic.exe
4972	wmic.exe
4972	wmic.exe
4972	wmic.exe
2896	wmic.exe
2896	wmic.exe
2896	wmic.exe
2896	wmic.exe
3156	wmic.exe
3156	wmic.exe
3156	wmic.exe
3156	wmic.exe
4604	powershell.exe
4604	powershell.exe
856	wmic.exe
856	wmic.exe
856	wmic.exe
856	wmic.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	764	octosint.exe
Token: SeIncreaseQuotaPrivilege	4876	wmic.exe
Token: SeSecurityPrivilege	4876	wmic.exe
Token: SeTakeOwnershipPrivilege	4876	wmic.exe
Token: SeLoadDriverPrivilege	4876	wmic.exe
Token: SeSystemProfilePrivilege	4876	wmic.exe
Token: SeSystemtimePrivilege	4876	wmic.exe
Token: SeProfSingleProcessPrivilege	4876	wmic.exe
Token: SeIncBasePriorityPrivilege	4876	wmic.exe
Token: SeCreatePagefilePrivilege	4876	wmic.exe
Token: SeBackupPrivilege	4876	wmic.exe
Token: SeRestorePrivilege	4876	wmic.exe
Token: SeShutdownPrivilege	4876	wmic.exe
Token: SeDebugPrivilege	4876	wmic.exe
Token: SeSystemEnvironmentPrivilege	4876	wmic.exe
Token: SeRemoteShutdownPrivilege	4876	wmic.exe
Token: SeUndockPrivilege	4876	wmic.exe
Token: SeManageVolumePrivilege	4876	wmic.exe
Token: 33	4876	wmic.exe
Token: 34	4876	wmic.exe
Token: 35	4876	wmic.exe
Token: 36	4876	wmic.exe
Token: SeIncreaseQuotaPrivilege	4876	wmic.exe
Token: SeSecurityPrivilege	4876	wmic.exe
Token: SeTakeOwnershipPrivilege	4876	wmic.exe
Token: SeLoadDriverPrivilege	4876	wmic.exe
Token: SeSystemProfilePrivilege	4876	wmic.exe
Token: SeSystemtimePrivilege	4876	wmic.exe
Token: SeProfSingleProcessPrivilege	4876	wmic.exe
Token: SeIncBasePriorityPrivilege	4876	wmic.exe
Token: SeCreatePagefilePrivilege	4876	wmic.exe
Token: SeBackupPrivilege	4876	wmic.exe
Token: SeRestorePrivilege	4876	wmic.exe
Token: SeShutdownPrivilege	4876	wmic.exe
Token: SeDebugPrivilege	4876	wmic.exe
Token: SeSystemEnvironmentPrivilege	4876	wmic.exe
Token: SeRemoteShutdownPrivilege	4876	wmic.exe
Token: SeUndockPrivilege	4876	wmic.exe
Token: SeManageVolumePrivilege	4876	wmic.exe
Token: 33	4876	wmic.exe
Token: 34	4876	wmic.exe
Token: 35	4876	wmic.exe
Token: 36	4876	wmic.exe
Token: SeDebugPrivilege	3620	powershell.exe
Token: SeIncreaseQuotaPrivilege	3620	powershell.exe
Token: SeSecurityPrivilege	3620	powershell.exe
Token: SeTakeOwnershipPrivilege	3620	powershell.exe
Token: SeLoadDriverPrivilege	3620	powershell.exe
Token: SeSystemProfilePrivilege	3620	powershell.exe
Token: SeSystemtimePrivilege	3620	powershell.exe
Token: SeProfSingleProcessPrivilege	3620	powershell.exe
Token: SeIncBasePriorityPrivilege	3620	powershell.exe
Token: SeCreatePagefilePrivilege	3620	powershell.exe
Token: SeBackupPrivilege	3620	powershell.exe
Token: SeRestorePrivilege	3620	powershell.exe
Token: SeShutdownPrivilege	3620	powershell.exe
Token: SeDebugPrivilege	3620	powershell.exe
Token: SeSystemEnvironmentPrivilege	3620	powershell.exe
Token: SeRemoteShutdownPrivilege	3620	powershell.exe
Token: SeUndockPrivilege	3620	powershell.exe
Token: SeManageVolumePrivilege	3620	powershell.exe
Token: 33	3620	powershell.exe
Token: 34	3620	powershell.exe
Token: 35	3620	powershell.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 764 wrote to memory of 4876	764	octosint.exe	81
PID 764 wrote to memory of 4876	764	octosint.exe	81
PID 764 wrote to memory of 4144	764	octosint.exe	84
PID 764 wrote to memory of 4144	764	octosint.exe	84
PID 764 wrote to memory of 3620	764	octosint.exe	86
PID 764 wrote to memory of 3620	764	octosint.exe	86
PID 764 wrote to memory of 2720	764	octosint.exe	89
PID 764 wrote to memory of 2720	764	octosint.exe	89
PID 764 wrote to memory of 4232	764	octosint.exe	91
PID 764 wrote to memory of 4232	764	octosint.exe	91
PID 764 wrote to memory of 2848	764	octosint.exe	93
PID 764 wrote to memory of 2848	764	octosint.exe	93
PID 764 wrote to memory of 4972	764	octosint.exe	98
PID 764 wrote to memory of 4972	764	octosint.exe	98
PID 764 wrote to memory of 2896	764	octosint.exe	100
PID 764 wrote to memory of 2896	764	octosint.exe	100
PID 764 wrote to memory of 3156	764	octosint.exe	102
PID 764 wrote to memory of 3156	764	octosint.exe	102
PID 764 wrote to memory of 4604	764	octosint.exe	104
PID 764 wrote to memory of 4604	764	octosint.exe	104
PID 764 wrote to memory of 856	764	octosint.exe	106
PID 764 wrote to memory of 856	764	octosint.exe	106
PID 764 wrote to memory of 4748	764	octosint.exe	109
PID 764 wrote to memory of 4748	764	octosint.exe	109
PID 4748 wrote to memory of 1916	4748	cmd.exe	111
PID 4748 wrote to memory of 1916	4748	cmd.exe	111

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
4144	attrib.exe

C:\Users\Admin\AppData\Local\Temp\octosint.exe
"C:\Users\Admin\AppData\Local\Temp\octosint.exe"
1⤵
- Drops file in Drivers directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:764
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4876
- C:\Windows\SYSTEM32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\octosint.exe"
  2⤵
  - Views/modifies file attributes
  PID:4144
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\octosint.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3620
- 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:2720
- 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:4232
- 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:2848
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:4972
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:2896
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:3156
- 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:4604
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  - Suspicious behavior: EnumeratesProcesses
  PID:856
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\octosint.exe" && pause
  2⤵
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:4748
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:1916

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
8f6c84cfe6eec6539acbdcab85b64bc9

SHA1
20e3bfa53fd0e387a25e89c2ef3dc65e79b8d347

SHA256
126cc6d04113893adb3baf80719b015a688af0038290267133122c97aa1ec09d

SHA512
e09663afe1e450ddb015c160aa0695bbb1f87fad7edd3de21567e77dd73271b5f1abb5f93ddf53184b6e592a34516522639271e08438489ccd6afaa89e119b2b

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

Filesize
1KB

MD5
cce846d4d061ab3c9c60e2e4723afc37

SHA1
dbfb35606ef1ba6a8fe0761baf0a5a8d61ddc3d0

SHA256
05493954effa576bee288b5da8a22c2b8cf6b3f1f7a7f49d430ff7c959e78385

SHA512
c21366673b03e1fd661acba46d00200f83df5a40668f1c39abcf6e0d92370a8fc40758e487566fd7066b185f0658d9f149f293dce01235b60fbac8c40f4d7172

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

Filesize
1KB

MD5
71ae70397208823d9fde08454a8a07cd

SHA1
42d7a3ee3335543dd48e89bf73d109177de51dfa

SHA256
4d2c8231db078731ab36c6e566d35184a3a8b964ed34a29048c71b7a8ad07b05

SHA512
87aaff7522eb16dac69510abbe8ec2203723411605acb386e8bdfda2953887a5b4aa382ea46646b395505888cbb79f7c018beedf939ab8e7f205ef74e74e4e82

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_yhltp1n1.p4u.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/764-33-0x000002A8C75A0000-0x000002A8C75F0000-memory.dmp

Filesize
320KB

Download
memory/764-2-0x00007FFDF6C50000-0x00007FFDF7712000-memory.dmp

Filesize
10.8MB

Download
memory/764-84-0x00007FFDF6C50000-0x00007FFDF7712000-memory.dmp

Filesize
10.8MB

Download
memory/764-83-0x000002A8E01B0000-0x000002A8E0357000-memory.dmp

Filesize
1.7MB

Download
memory/764-78-0x000002A8E01B0000-0x000002A8E0357000-memory.dmp

Filesize
1.7MB

Download
memory/764-32-0x000002A8C7740000-0x000002A8C77B6000-memory.dmp

Filesize
472KB

Download
memory/764-0-0x00007FFDF6C53000-0x00007FFDF6C55000-memory.dmp

Filesize
8KB

Download
memory/764-34-0x000002A8C77C0000-0x000002A8C77DE000-memory.dmp

Filesize
120KB

Download
memory/764-77-0x00007FFDF6C50000-0x00007FFDF7712000-memory.dmp

Filesize
10.8MB

Download
memory/764-74-0x00007FFDF6C53000-0x00007FFDF6C55000-memory.dmp

Filesize
8KB

Download
memory/764-59-0x000002A8C7560000-0x000002A8C756A000-memory.dmp

Filesize
40KB

Download
memory/764-60-0x000002A8C75F0000-0x000002A8C7602000-memory.dmp

Filesize
72KB

Download
memory/764-1-0x000002A8C5860000-0x000002A8C5904000-memory.dmp

Filesize
656KB

Download
memory/3620-15-0x00007FFDF6C50000-0x00007FFDF7712000-memory.dmp

Filesize
10.8MB

Download
memory/3620-8-0x00007FFDF6C50000-0x00007FFDF7712000-memory.dmp

Filesize
10.8MB

Download
memory/3620-14-0x00007FFDF6C50000-0x00007FFDF7712000-memory.dmp

Filesize
10.8MB

Download
memory/3620-13-0x0000021F73730000-0x0000021F73752000-memory.dmp

Filesize
136KB

Download
memory/3620-18-0x00007FFDF6C50000-0x00007FFDF7712000-memory.dmp

Filesize
10.8MB

Download