Overview

overview

10

Static

static

csrss.exe

windows7_x64

10

csrss.exe

windows10_x64

10

Sharing

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General

  • Target

    csrss.exe

  • Size

    2.1MB

  • Sample

    210418-p9s2m97j72

  • MD5

    2a9be7e5bc1de20522b4e71159159956

  • SHA1

    53b6034d122211f7e3937d5f61325d3211842848

  • SHA256

    f0e98cc9e77c4b14e67aae84dcb833f9d40a536a253cca74409fa195cb35154e

  • SHA512

    af42bc88d9de45a575ce63be246706e98e0135738b63d1f02d28fb024487112736be72f7869822ceb8a16617b43a5235d41358b090d223e9913a1cfacd60e7a0

Score
10/10
evasionpersistence

Malware Config

Targets

    • Target

      csrss.exe

    • Size

      2.1MB

    • MD5

      2a9be7e5bc1de20522b4e71159159956

    • SHA1

      53b6034d122211f7e3937d5f61325d3211842848

    • SHA256

      f0e98cc9e77c4b14e67aae84dcb833f9d40a536a253cca74409fa195cb35154e

    • SHA512

      af42bc88d9de45a575ce63be246706e98e0135738b63d1f02d28fb024487112736be72f7869822ceb8a16617b43a5235d41358b090d223e9913a1cfacd60e7a0

    Score
    10/10
    evasionpersistence

    • Modifies WinLogon for persistence

      persistence

    • Identifies VirtualBox via ACPI registry values (likely anti-VM)

      evasion

    • Executes dropped EXE

    • Checks BIOS information in registry

      BIOS information is often read in order to detect sandboxing environments.

    • Identifies Wine through registry keys

      Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

      evasion

    • Loads dropped DLL

    • Adds Run key to start application

      persistence

    • 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

    • Suspicious use of NtSetInformationThreadHideFromDebugger

    behavioral1behavioral2

MITRE ATT&CK Enterprise v6

Tasks