Overview

overview

7

Static

static

1

kworkerd.crdownload

ubuntu-18.04-amd64

7

Sharing

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General

  • Target
    kworkerd.crdownload
  • Size 271KB
  • Sample260708-3jce8abt8s
  • SHA256 05686c56837324d1bbb9b98c331bd689af81de4a27c52a4d84ace7e25302e111
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
7/10
antivmdefense_evasiondiscoveryexecutionlinuxpersistenceprivilege_escalation

Malware Config

Targets

    • Target
      kworkerd.crdownload
    • Size 271KB
    • SHA256 05686c56837324d1bbb9b98c331bd689af81de4a27c52a4d84ace7e25302e111
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    7/10
    antivmdefense_evasiondiscoveryexecutionpersistenceprivilege_escalation

    • Deletes itself

    • Modifies Watchdog functionality

      Malware like Mirai modifies the Watchdog to prevent it restarting an infected system.

      defense_evasion

    • Creates/modifies Cron job

      Cron allows running tasks on a schedule, and is commonly used for malware persistence.

      executionpersistenceprivilege_escalation

    • Enumerates active TCP sockets

      Gets active TCP sockets from /proc virtual filesystem.

      discovery

    • Enumerates running processes

      Discovers information about currently running processes on the system

    • Modifies systemd

      Adds/ modifies systemd service files. Likely to achieve persistence.

      persistenceprivilege_escalation

    • Reads MAC address of network interface

      Fetches the MAC address of active network interfaces. May be used to detect known values for hypervisors.

      defense_evasiondiscovery
    behavioral1

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1
T1053

Cron

1
T1053.003

Persistence

Boot or Logon Autostart Execution

1
T1547

XDG Autostart Entries

1
T1547.013

Create or Modify System Process

1
T1543

Systemd Service

1
T1543.002

Scheduled Task/Job

1
T1053

Cron

1
T1053.003

Privilege Escalation

Boot or Logon Autostart Execution

1
T1547

XDG Autostart Entries

1
T1547.013

Create or Modify System Process

1
T1543

Systemd Service

1
T1543.002

Scheduled Task/Job

1
T1053

Cron

1
T1053.003

Defense Evasion

Impair Defenses

1
T1562

Virtualization/Sandbox Evasion

1
T1497

System Checks

1
T1497.001

Credential Access

Discovery

System Information Discovery

1
T1082

System Network Configuration Discovery

2
T1016

Internet Connection Discovery

1
T1016.001

Wi-Fi Discovery

1
T1016.002

System Network Connections Discovery

2
T1049

Virtualization/Sandbox Evasion

1
T1497

System Checks

1
T1497.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Tasks