Overview

overview

10

Static

static

3

WexSide.exe

windows10-2004-x64

10

Sharing

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General

  • Target

    WexSide.exe

  • Size

    2.2MB

  • Sample

    240531-pe5pbahc35

  • MD5

    185d2eb442c0f2c465ff5fc759621de6

  • SHA1

    fceed286074f22e85287570ffa735d5874c8a139

  • SHA256

    de88a6957905b06ffa24d512b148dd6fee45df029c676f1b0755fe0fa73ea871

  • SHA512

    b9b25092fea71f573ca8c42beb376e53d0b9b68bc208990ba726b9c7c935ee243b78cd5fb84ce854445abba9d54b2e59c04ead03f1f5eec28286f2501e85bdeb

  • SSDEEP

    49152:RFUvKLlr9rxyRciFlXKUusoNSAHWlCcHANKMY2Xj:RavGlrJxyRc2XKdSA2hnMY2Xj

Score
10/10
umbralexecutionpersistencespywarestealer

Malware Config

Targets

    • Target

      WexSide.exe

    • Size

      2.2MB

    • MD5

      185d2eb442c0f2c465ff5fc759621de6

    • SHA1

      fceed286074f22e85287570ffa735d5874c8a139

    • SHA256

      de88a6957905b06ffa24d512b148dd6fee45df029c676f1b0755fe0fa73ea871

    • SHA512

      b9b25092fea71f573ca8c42beb376e53d0b9b68bc208990ba726b9c7c935ee243b78cd5fb84ce854445abba9d54b2e59c04ead03f1f5eec28286f2501e85bdeb

    • SSDEEP

      49152:RFUvKLlr9rxyRciFlXKUusoNSAHWlCcHANKMY2Xj:RavGlrJxyRc2XKdSA2hnMY2Xj

    Score
    10/10
    umbralexecutionpersistencespywarestealer

    • Detect Umbral payload

    • Modifies WinLogon for persistence

      persistence

    • Process spawned unexpected child process

      This typically indicates the parent process was compromised via an exploit or macro.

    • Umbral

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

      stealerumbral

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

      execution

    • Drops file in Drivers directory

    • Checks computer location settings

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

    • Executes dropped EXE

    • 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.

    • Drops file in System32 directory

    behavioral1

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

2
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Winlogon Helper DLL

1
T1547.004

Scheduled Task/Job

1
T1053

Privilege Escalation

Boot or Logon Autostart Execution

2
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Winlogon Helper DLL

1
T1547.004

Scheduled Task/Job

1
T1053

Defense Evasion

Modify Registry

2
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