umbral | f6978810fc08e07982be2acda6f8692bca7011119e15088fcb2ab006de8dece7

Analysis

max time kernel
120s
max time network
121s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
30-11-2024 09:41

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General

Target

octosint.exe
Size

631KB
MD5

3fbddef1a1957c47cc788a7ea3be9bf1
SHA1

5d68695893be73ad26a1b6115ac38a3e72e11cbf
SHA256

f6978810fc08e07982be2acda6f8692bca7011119e15088fcb2ab006de8dece7
SHA512

76cb0b768c15464ae4dc41d90909a1c740de8e2b3f7b8d37f255068e5a0bd0c6d666e68fcfec47f6cca268de5cf24bc2a85800fb3fe3244fe25b60b8f17c5e54
SSDEEP

12288:5oZtL+EP8gGVK9rI8j967NokRRC9iMdRC:XI8LVK9rI8j967NokRRsiMdA

Score

10^/10

umbral discovery execution spyware stealer

Malware Config

Signatures

Detect Umbral payload 1 IoCs

resource	yara_rule
behavioral1/memory/2680-1-0x0000000000990000-0x0000000000A34000-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
2532	powershell.exe
2976	powershell.exe
2636	powershell.exe
2252	powershell.exe

Drops file in Drivers directory 1 IoCs

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

Deletes itself 1 IoCs

pid	Process
1088	cmd.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
10	discord.com
9	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
1088	cmd.exe
692	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
3048	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
692	PING.EXE

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2680	octosint.exe
2532	powershell.exe
2976	powershell.exe
2636	powershell.exe
1508	powershell.exe
2252	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	2680	octosint.exe
Token: SeIncreaseQuotaPrivilege	2780	wmic.exe
Token: SeSecurityPrivilege	2780	wmic.exe
Token: SeTakeOwnershipPrivilege	2780	wmic.exe
Token: SeLoadDriverPrivilege	2780	wmic.exe
Token: SeSystemProfilePrivilege	2780	wmic.exe
Token: SeSystemtimePrivilege	2780	wmic.exe
Token: SeProfSingleProcessPrivilege	2780	wmic.exe
Token: SeIncBasePriorityPrivilege	2780	wmic.exe
Token: SeCreatePagefilePrivilege	2780	wmic.exe
Token: SeBackupPrivilege	2780	wmic.exe
Token: SeRestorePrivilege	2780	wmic.exe
Token: SeShutdownPrivilege	2780	wmic.exe
Token: SeDebugPrivilege	2780	wmic.exe
Token: SeSystemEnvironmentPrivilege	2780	wmic.exe
Token: SeRemoteShutdownPrivilege	2780	wmic.exe
Token: SeUndockPrivilege	2780	wmic.exe
Token: SeManageVolumePrivilege	2780	wmic.exe
Token: 33	2780	wmic.exe
Token: 34	2780	wmic.exe
Token: 35	2780	wmic.exe
Token: SeIncreaseQuotaPrivilege	2780	wmic.exe
Token: SeSecurityPrivilege	2780	wmic.exe
Token: SeTakeOwnershipPrivilege	2780	wmic.exe
Token: SeLoadDriverPrivilege	2780	wmic.exe
Token: SeSystemProfilePrivilege	2780	wmic.exe
Token: SeSystemtimePrivilege	2780	wmic.exe
Token: SeProfSingleProcessPrivilege	2780	wmic.exe
Token: SeIncBasePriorityPrivilege	2780	wmic.exe
Token: SeCreatePagefilePrivilege	2780	wmic.exe
Token: SeBackupPrivilege	2780	wmic.exe
Token: SeRestorePrivilege	2780	wmic.exe
Token: SeShutdownPrivilege	2780	wmic.exe
Token: SeDebugPrivilege	2780	wmic.exe
Token: SeSystemEnvironmentPrivilege	2780	wmic.exe
Token: SeRemoteShutdownPrivilege	2780	wmic.exe
Token: SeUndockPrivilege	2780	wmic.exe
Token: SeManageVolumePrivilege	2780	wmic.exe
Token: 33	2780	wmic.exe
Token: 34	2780	wmic.exe
Token: 35	2780	wmic.exe
Token: SeDebugPrivilege	2532	powershell.exe
Token: SeDebugPrivilege	2976	powershell.exe
Token: SeDebugPrivilege	2636	powershell.exe
Token: SeDebugPrivilege	1508	powershell.exe
Token: SeIncreaseQuotaPrivilege	2348	wmic.exe
Token: SeSecurityPrivilege	2348	wmic.exe
Token: SeTakeOwnershipPrivilege	2348	wmic.exe
Token: SeLoadDriverPrivilege	2348	wmic.exe
Token: SeSystemProfilePrivilege	2348	wmic.exe
Token: SeSystemtimePrivilege	2348	wmic.exe
Token: SeProfSingleProcessPrivilege	2348	wmic.exe
Token: SeIncBasePriorityPrivilege	2348	wmic.exe
Token: SeCreatePagefilePrivilege	2348	wmic.exe
Token: SeBackupPrivilege	2348	wmic.exe
Token: SeRestorePrivilege	2348	wmic.exe
Token: SeShutdownPrivilege	2348	wmic.exe
Token: SeDebugPrivilege	2348	wmic.exe
Token: SeSystemEnvironmentPrivilege	2348	wmic.exe
Token: SeRemoteShutdownPrivilege	2348	wmic.exe
Token: SeUndockPrivilege	2348	wmic.exe
Token: SeManageVolumePrivilege	2348	wmic.exe
Token: 33	2348	wmic.exe
Token: 34	2348	wmic.exe

Suspicious use of WriteProcessMemory 39 IoCs

description	pid	Process	procid_target
PID 2680 wrote to memory of 2780	2680	octosint.exe	30
PID 2680 wrote to memory of 2780	2680	octosint.exe	30
PID 2680 wrote to memory of 2780	2680	octosint.exe	30
PID 2680 wrote to memory of 2652	2680	octosint.exe	33
PID 2680 wrote to memory of 2652	2680	octosint.exe	33
PID 2680 wrote to memory of 2652	2680	octosint.exe	33
PID 2680 wrote to memory of 2532	2680	octosint.exe	35
PID 2680 wrote to memory of 2532	2680	octosint.exe	35
PID 2680 wrote to memory of 2532	2680	octosint.exe	35
PID 2680 wrote to memory of 2976	2680	octosint.exe	37
PID 2680 wrote to memory of 2976	2680	octosint.exe	37
PID 2680 wrote to memory of 2976	2680	octosint.exe	37
PID 2680 wrote to memory of 2636	2680	octosint.exe	39
PID 2680 wrote to memory of 2636	2680	octosint.exe	39
PID 2680 wrote to memory of 2636	2680	octosint.exe	39
PID 2680 wrote to memory of 1508	2680	octosint.exe	41
PID 2680 wrote to memory of 1508	2680	octosint.exe	41
PID 2680 wrote to memory of 1508	2680	octosint.exe	41
PID 2680 wrote to memory of 2348	2680	octosint.exe	43
PID 2680 wrote to memory of 2348	2680	octosint.exe	43
PID 2680 wrote to memory of 2348	2680	octosint.exe	43
PID 2680 wrote to memory of 572	2680	octosint.exe	45
PID 2680 wrote to memory of 572	2680	octosint.exe	45
PID 2680 wrote to memory of 572	2680	octosint.exe	45
PID 2680 wrote to memory of 1980	2680	octosint.exe	47
PID 2680 wrote to memory of 1980	2680	octosint.exe	47
PID 2680 wrote to memory of 1980	2680	octosint.exe	47
PID 2680 wrote to memory of 2252	2680	octosint.exe	49
PID 2680 wrote to memory of 2252	2680	octosint.exe	49
PID 2680 wrote to memory of 2252	2680	octosint.exe	49
PID 2680 wrote to memory of 3048	2680	octosint.exe	51
PID 2680 wrote to memory of 3048	2680	octosint.exe	51
PID 2680 wrote to memory of 3048	2680	octosint.exe	51
PID 2680 wrote to memory of 1088	2680	octosint.exe	53
PID 2680 wrote to memory of 1088	2680	octosint.exe	53
PID 2680 wrote to memory of 1088	2680	octosint.exe	53
PID 1088 wrote to memory of 692	1088	cmd.exe	55
PID 1088 wrote to memory of 692	1088	cmd.exe	55
PID 1088 wrote to memory of 692	1088	cmd.exe	55

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

pid	Process
2652	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:2680
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2780
- C:\Windows\system32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\octosint.exe"
  2⤵
  - Views/modifies file attributes
  PID:2652
- 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:2532
- 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
  - Suspicious use of AdjustPrivilegeToken
  PID:2976
- 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
  - Suspicious use of AdjustPrivilegeToken
  PID:2636
- 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:1508
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2348
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:572
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1980
- 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:2252
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:3048
- C:\Windows\system32\cmd.exe
  "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\octosint.exe" && pause
  2⤵
  - Deletes itself
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:1088
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:692

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\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

Filesize
7KB

MD5
1d63476597cce5fe79802c7507af3064

SHA1
ea734c59d32fff4c9c84ca1edfe55d848cc1f6f3

SHA256
fe073ac857d07df3c53ebdd9947788679204f8679b8d3ae82766eac6a65c0567

SHA512
1d1f71156663aa37198353aee6456981a8fe99b71c8f6162fb40583e7ccbaa7d8bf8ae65e477f6ed6e35de535d52935e9667b6443957f3e0787052fc412ce80d

Download Submit
memory/2252-42-0x0000000002080000-0x0000000002088000-memory.dmp

Filesize
32KB

Download
memory/2532-7-0x000000001B910000-0x000000001BBF2000-memory.dmp

Filesize
2.9MB

Download
memory/2532-8-0x0000000001D80000-0x0000000001D88000-memory.dmp

Filesize
32KB

Download
memory/2680-0-0x000007FEF4D23000-0x000007FEF4D24000-memory.dmp

Filesize
4KB

Download
memory/2680-1-0x0000000000990000-0x0000000000A34000-memory.dmp

Filesize
656KB

Download
memory/2680-2-0x000007FEF4D20000-0x000007FEF570C000-memory.dmp

Filesize
9.9MB

Download
memory/2680-44-0x000007FEF4D23000-0x000007FEF4D24000-memory.dmp

Filesize
4KB

Download
memory/2680-45-0x000007FEF4D20000-0x000007FEF570C000-memory.dmp

Filesize
9.9MB

Download
memory/2680-48-0x000007FEF4D20000-0x000007FEF570C000-memory.dmp

Filesize
9.9MB

Download
memory/2976-14-0x000000001B7A0000-0x000000001BA82000-memory.dmp

Filesize
2.9MB

Download
memory/2976-15-0x0000000001D60000-0x0000000001D68000-memory.dmp

Filesize
32KB

Download