Overview

overview

8

Static

static

1

cwlfkwnt.i686.elf

ubuntu-18.04-amd64

8

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General

  • Target
    cwlfkwnt.i686.elf
  • Size 1.0MB
  • Sample260924-a4c82aaa38
  • SHA256 176a1c79c638bc091c57efefefea8b20cd6b1a2ab093ad5ddd859b4810391a98
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
8/10
antivmcredential_accessdefense_evasiondiscoveryexecutionlinuxpersistenceprivilege_escalation

Malware Config

Targets

    • Target
      cwlfkwnt.i686.elf
    • Size 1.0MB
    • SHA256 176a1c79c638bc091c57efefefea8b20cd6b1a2ab093ad5ddd859b4810391a98
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    8/10
    antivmcredential_accessdefense_evasiondiscoveryexecutionpersistenceprivilege_escalation

    • Contacts a large (506) amount of remote hosts

      This may indicate a network scan to discover remotely running services.

      discovery

    • File and Directory Permissions Modification

      Adversaries may modify file or directory permissions to evade defenses.

      defense_evasion

    • Creates Raw socket

      Creates a socket that captures raw packets at the device level

    • Modifies Watchdog functionality

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

      defense_evasion

    • OS Credential Dumping

      Adversaries may attempt to dump credentials to use it in password cracking.

      credential_access

    • Abuse Elevation Control Mechanism: Sudo and Sudo Caching

      Abuse sudo or cached sudo credentials to execute code.

      privilege_escalationdefense_evasion

    • Reads AppArmor ptrace settings

      Discovery of allowed ptrace capabilities by AppArmor.

      discovery

    • Checks hardware identifiers (DMI)

      Checks DMI information which indicate if the system is a virtual machine.

      antivm

    • Creates/modifies Cron job

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

      executionpersistenceprivilege_escalation

    • Deletes log files

      Deletes log files on the system.

      defense_evasion

    • Enumerates running processes

      Discovers information about currently running processes on the system

    • Modifies rc script

      Adding/modifying system rc scripts is a common persistence mechanism.

      persistence

    • 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

    • Reads hardware information

      Accesses system info like serial numbers, manufacturer names etc.

      discovery

    • Reads network interface configuration

      Fetches information about one or more active network interfaces.

      discovery

    • Schedules an At job

      Schedules a job to be run using the at command.

      executionpersistenceprivilege_escalation

    • Uses Polkit to run commands

      Uses Polkit pkexec as a proxy to execute commands, possibly to bypass security restrictions.

    behavioral1

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

2
T1053

At

1
T1053.002

Cron

1
T1053.003

Persistence

Boot or Logon Autostart Execution

1
T1547

Boot or Logon Initialization Scripts

1
T1037

RC Scripts

1
T1037.004

Scheduled Task/Job

2
T1053

At

1
T1053.002

Cron

1
T1053.003

Privilege Escalation

Abuse Elevation Control Mechanism

1
T1548

Sudo and Sudo Caching

1
T1548.003

Boot or Logon Autostart Execution

1
T1547

Boot or Logon Initialization Scripts

1
T1037

RC Scripts

1
T1037.004

Scheduled Task/Job

2
T1053

At

1
T1053.002

Cron

1
T1053.003

Defense Evasion

Abuse Elevation Control Mechanism

1
T1548

Sudo and Sudo Caching

1
T1548.003

File and Directory Permissions Modification

1
T1222

Linux and Mac File and Directory Permissions Modification

1
T1222.002

Impair Defenses

1
T1562

Indicator Removal

1
T1070

Clear Linux or Mac System Logs

1
T1070.002

Virtualization/Sandbox Evasion

2
T1497

System Checks

2
T1497.001

Credential Access

OS Credential Dumping

1
T1003

/etc/passwd and /etc/shadow

1
T1003.008

Discovery

Network Service Discovery

1
T1046

System Information Discovery

4
T1082

System Network Configuration Discovery

3
T1016

Wi-Fi Discovery

1
T1016.002

System Network Connections Discovery

2
T1049

Virtualization/Sandbox Evasion

2
T1497

System Checks

2
T1497.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Tasks