Overview

overview

10

Static

static

3

Client.exe

windows7-x64

10

Client.exe

windows10-2004-x64

10

Sharing

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General

  • Target

    Client.exe

  • Size

    380KB

  • Sample

    240605-cazlaabe52

  • MD5

    7091d715676e10c44205e6fa7f50b7bd

  • SHA1

    a950398047b6b554181538d6e78ada18bfba510e

  • SHA256

    23f43cc11c07245b3c5c14333a53b97330ebd7afa4a893245834fbebfa967d88

  • SHA512

    2fd66a8fd5b4d0f1ef52f6cd89b8e14936b56fdb967a83382d8081e67fbbabdb609decef98d19c8caebcc1b5b9bcc3cbaa0209112c9c081556ff87bfcdf7308b

  • SSDEEP

    6144:MwZC8z6GIwaC9M1G4TIcgGz+rH4uCBbhZnKMgVia:RZC8OGgt1G4TGY+NCNn4Vi

Score
10/10
umbralevasionexecutionpersistencespywarestealertrojan

Malware Config

Extracted

Family

umbral

C2

https://discord.com/api/webhooks/1247729405409759390/zWUzhv3beId_l06S4nnTrfCRsAkIoHRjlpnuQcnbUkUm0eJjGGkP-VfghAOgfXCbrdiS

Targets

    • Target

      Client.exe

    • Size

      380KB

    • MD5

      7091d715676e10c44205e6fa7f50b7bd

    • SHA1

      a950398047b6b554181538d6e78ada18bfba510e

    • SHA256

      23f43cc11c07245b3c5c14333a53b97330ebd7afa4a893245834fbebfa967d88

    • SHA512

      2fd66a8fd5b4d0f1ef52f6cd89b8e14936b56fdb967a83382d8081e67fbbabdb609decef98d19c8caebcc1b5b9bcc3cbaa0209112c9c081556ff87bfcdf7308b

    • SSDEEP

      6144:MwZC8z6GIwaC9M1G4TIcgGz+rH4uCBbhZnKMgVia:RZC8OGgt1G4TGY+NCNn4Vi

    Score
    10/10
    umbralevasionexecutionpersistencespywarestealertrojan

    • Contains code to disable Windows Defender

      A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

    • Detect Umbral payload

    • Modifies WinLogon for persistence

      persistence

    • UAC bypass

      evasiontrojan

    • Umbral

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

      stealerumbral

    • Command and Scripting Interpreter: PowerShell

      Start PowerShell.

      execution

    • Drops file in Drivers directory

    • Executes dropped EXE

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

      spywarestealer

    • Checks whether UAC is enabled

      evasiontrojan

    • Legitimate hosting services abused for malware hosting/C2

    • Looks up external IP address via web service

      Uses a legitimate IP lookup service to find the infected system's external IP.

    behavioral1behavioral2

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Command and Scripting Interpreter

1
T1059

PowerShell

1
T1059.001

Scheduled Task/Job

1
T1053

Persistence

Boot or Logon Autostart Execution

1
T1547

Winlogon Helper DLL

1
T1547.004

Scheduled Task/Job

1
T1053

Privilege Escalation

Boot or Logon Autostart Execution

1
T1547

Winlogon Helper DLL

1
T1547.004

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Scheduled Task/Job

1
T1053

Defense Evasion

Modify Registry

3
T1112

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Impair Defenses

1
T1562

Disable or Modify Tools

1
T1562.001

Hide Artifacts

1
T1564

Hidden Files and Directories

1
T1564.001

Credential Access

Unsecured Credentials

1
T1552

Credentials In Files

1
T1552.001

Discovery

System Information Discovery

3
T1082

Remote System Discovery

1
T1018

Query Registry

1
T1012

Lateral Movement

Collection

Data from Local System

1
T1005

Exfiltration

Command and Control

Web Service

1
T1102

Impact

Resource Development

Reconnaissance

Tasks