Overview

overview

10

Static

static

10

C37boot/C3...er.exe

windows10-2004-x64

10

C37boot/C3...er.exe

windows11-21h2-x64

10

Sharing

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General

  • Target

    C37boot.zip

  • Size

    138KB

  • Sample

    240605-tp5jhsbg2s

  • MD5

    823806e44f19c682c6de359fa332c452

  • SHA1

    78ca243e9b4690c2c82bc75456087a1f82d803b7

  • SHA256

    73207e68fd2611a51968b6903020cedf7d6c07eeb7e8570de6ac533d93d31e25

  • SHA512

    319d0bb0b65e45f68c9d2de005178211878286eb978f644af9955e50193ce5d7e09f5686da0bbd125a3f9f8e4f074901d7ee6fbdbf904bdb810c752280f81cca

  • SSDEEP

    3072:ls5OiL2k7hkVitM5ca5v6Si5in/bSlJpsxZ/TGyDlz:ls5J2Rtmm6tiOsrTb5

Score
10/10
umbralexecutionspywarestealer

Malware Config

Extracted

Family

umbral

C2

https://discord.com/api/webhooks/1247939114515431576/-I9y34Eg1J2F4FolssK-68gxrpNUiziMBe1Dq5-AXRXx_G_XjzHxBj25MXS-XoZvwnV0

Targets

    • Target

      C37boot/C37Bootstrapper.exe

    • Size

      405KB

    • MD5

      c8294556e29920bfcc619529da141096

    • SHA1

      7dad1b482c1d3baeade911400027e615e2ea52ff

    • SHA256

      26deb9a0264cccfdef387610235e9e9032144c8e73561c3d0007c248a6c84dc3

    • SHA512

      1ac29a6ecdf761d85d3b1b64910f7edd865238d1d6b159532efb8260fa9af35c7db06892359ba9efe7bd571ec2bd259a0621721666fd5b085e92f68848f63af6

    • SSDEEP

      6144:nloZM+rIkd8g+EtXHkv/iD4w85EFzQEb3CzFQMpFlb8e1mBiEqkRH:loZtL+EP8w85EFzQEb3CzFQMpfvEJ

    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

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

1
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