Overview

overview

10

Static

static

10

C37Bootstrapper.exe

windows7-x64

10

C37Bootstrapper.exe

windows10-2004-x64

10

Resubmissions

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General

  • Target

    C37Bootstrapper.exe

  • Size

    407KB

  • Sample

    240605-vcjxqadb82

  • MD5

    2a25b9d935c4fe0a9f85251ecabfd923

  • SHA1

    bebbdce90e0ba9eb1cf388f0db17dbb97775e9e2

  • SHA256

    b5015182ecaa7561f27090fb7b2aab0decbbffc94606225b12676dc720266498

  • SHA512

    08f31d8e8867fcdadb209d28ad3f654b694fe5ec19a289871d758ab75d7759f08c4b8f01c789be22c2e83dafa8ec9e861479003e1e091038074471c701bf9dbf

  • SSDEEP

    6144:oloZMLrIkd8g+EtXHkv/iD4I7lXrRiK1AwBzOurZpjb8e1mVi4qkRH:2oZ0L+EP8I7lXrRiK1AwBzOurzr4J

Score
10/10
umbralexecutionspywarestealer

Malware Config

Extracted

Family

umbral

C2

https://discord.com/api/webhooks/1240608431912648746/0xO8j0CKqDNLBbrrGwB4Di4ZwKK6d-HUusc2YnRBbbd4ysQkmEvxp1Nbx9O5yHNNZk95

Targets

    • Target

      C37Bootstrapper.exe

    • Size

      407KB

    • MD5

      2a25b9d935c4fe0a9f85251ecabfd923

    • SHA1

      bebbdce90e0ba9eb1cf388f0db17dbb97775e9e2

    • SHA256

      b5015182ecaa7561f27090fb7b2aab0decbbffc94606225b12676dc720266498

    • SHA512

      08f31d8e8867fcdadb209d28ad3f654b694fe5ec19a289871d758ab75d7759f08c4b8f01c789be22c2e83dafa8ec9e861479003e1e091038074471c701bf9dbf

    • SSDEEP

      6144:oloZMLrIkd8g+EtXHkv/iD4I7lXrRiK1AwBzOurZpjb8e1mVi4qkRH:2oZ0L+EP8I7lXrRiK1AwBzOurzr4J

    Score
    10/10
    umbralexecutionspywarestealer

    • Detect Umbral payload

    • 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

    • Reads user/profile data of web browsers

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

      spywarestealer

    • 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

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Unsecured Credentials

1
T1552

Credentials In Files

1
T1552.001

Discovery

System Information Discovery

1
T1082

Lateral Movement

Collection

Data from Local System

1
T1005

Exfiltration

Command and Control

Web Service

1
T1102

Impact

Resource Development

Reconnaissance

Tasks