Overview

overview

10

Static

static

3

Expensive.exe

windows7-x64

7

Expensive.exe

windows10-2004-x64

10

Sharing

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General

  • Target

    Expensive.exe

  • Size

    599KB

  • Sample

    240526-tpeyvsda78

  • MD5

    65e4c0420f496abb02201df254eb87a1

  • SHA1

    6efcf4be11132a32a3df5029c87d2daa466fcc1a

  • SHA256

    3684b6d86d9928b8dfef807c55d5de421b6325c0cb28991037d26703598d1e44

  • SHA512

    bedb40ae7f3a6c1a2cc7e62069025d87b5383526e414df9825ad50bf8516077574134fe25ff285f0754d2bee608ba619ee56a33d4e9ddb6a997dab4d5635f6bb

  • SSDEEP

    12288:jeHrZIhqCgsKF/kFnBf5rkb2LAW/4Mon2rcATuNpGRhb5vUMfyU1/:jsFQqS0kR9aCkW/4t2r9upGmM6U1

Score
10/10
umbralexecutionpersistencespywarestealer

Malware Config

Targets

    • Target

      Expensive.exe

    • Size

      599KB

    • MD5

      65e4c0420f496abb02201df254eb87a1

    • SHA1

      6efcf4be11132a32a3df5029c87d2daa466fcc1a

    • SHA256

      3684b6d86d9928b8dfef807c55d5de421b6325c0cb28991037d26703598d1e44

    • SHA512

      bedb40ae7f3a6c1a2cc7e62069025d87b5383526e414df9825ad50bf8516077574134fe25ff285f0754d2bee608ba619ee56a33d4e9ddb6a997dab4d5635f6bb

    • SSDEEP

      12288:jeHrZIhqCgsKF/kFnBf5rkb2LAW/4Mon2rcATuNpGRhb5vUMfyU1/:jsFQqS0kR9aCkW/4t2r9upGmM6U1

    Score
    10/10
    executionumbralpersistencespywarestealer

    • Detect Umbral payload

    • Modifies WinLogon for persistence

      persistence

    • Umbral

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

      stealerumbral

    • Command and Scripting Interpreter: PowerShell

      Run Powershell and hide display window.

      execution

    • Drops file in Drivers directory

    • Modifies AppInit DLL entries

      persistence

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Executes dropped EXE

    • Loads dropped DLL

    • Reads user/profile data of web browsers

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

      spywarestealer

    • Adds Run key to start application

      persistence

    • 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

2
T1059

PowerShell

2
T1059.001

Scheduled Task/Job

1
T1053

Persistence

Boot or Logon Autostart Execution

3
T1547

Registry Run Keys / Startup Folder

2
T1547.001

Winlogon Helper DLL

1
T1547.004

Scheduled Task/Job

1
T1053

Privilege Escalation

Boot or Logon Autostart Execution

3
T1547

Registry Run Keys / Startup Folder

2
T1547.001

Winlogon Helper DLL

1
T1547.004

Scheduled Task/Job

1
T1053

Defense Evasion

Modify Registry

3
T1112

Hide Artifacts

1
T1564

Hidden Files and Directories

1
T1564.001

Credential Access

Unsecured Credentials

1
T1552

Credentials In Files

1
T1552.001

Discovery

Query Registry

2
T1012

System Information Discovery

3
T1082

Remote System Discovery

1
T1018

Lateral Movement

Collection

Data from Local System

1
T1005

Exfiltration

Command and Control

Web Service

1
T1102

Impact

Resource Development

Reconnaissance

Tasks