General

  • Target

    bruteforcer.exe

  • Size

    231KB

  • Sample

    240907-l56graycql

  • MD5

    1e2b102dcdabbee48cd1308fba1f6719

  • SHA1

    b657cdb68bb499c81f3746965ce63db8b8da7017

  • SHA256

    27fddb3ad83e8139d32ec09c8d6790b0ddd177c2e90f84f104c64010f91e4401

  • SHA512

    7e46052ca1abddd8fc993034cca84fe5d0752629d571a1dd4292a97c6c2a56906a20b7a910d3519ef875dfc1864333d01a8e223c9f18fa7fedf78dd9cdc5408d

  • SSDEEP

    6144:sloZML9EBw/S6NtFnEPfCJxg8JhAA1HM0ryurdEwZThANnp8e1mGRw:qoZhYS6NZLg8JhAA1HM0ryurdEwZTh8C

Malware Config

Extracted

Family

umbral

C2

https://discord.com/api/webhooks/1281752709590155376/wFe_vTO1MKOOqSG-vjtrbd6ytwscIOTVT2CLPeLZ1oamVoS_gQzT9qnmapIrBL8dRs9M

Targets

    • Target

      bruteforcer.exe

    • Size

      231KB

    • MD5

      1e2b102dcdabbee48cd1308fba1f6719

    • SHA1

      b657cdb68bb499c81f3746965ce63db8b8da7017

    • SHA256

      27fddb3ad83e8139d32ec09c8d6790b0ddd177c2e90f84f104c64010f91e4401

    • SHA512

      7e46052ca1abddd8fc993034cca84fe5d0752629d571a1dd4292a97c6c2a56906a20b7a910d3519ef875dfc1864333d01a8e223c9f18fa7fedf78dd9cdc5408d

    • SSDEEP

      6144:sloZML9EBw/S6NtFnEPfCJxg8JhAA1HM0ryurdEwZThANnp8e1mGRw:qoZhYS6NZLg8JhAA1HM0ryurdEwZTh8C

    • Detect Umbral payload

    • Umbral

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

    • Credentials from Password Stores: Credentials from Web Browsers

      Malicious Access or copy of Web Browser Credential store.

    • Command and Scripting Interpreter: PowerShell

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

    • Drops file in Drivers directory

    • Deletes itself

    • Reads user/profile data of web browsers

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

    • 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.

MITRE ATT&CK Enterprise v15

Tasks