Overview

overview

9

Static

static

1

x86.elf

ubuntu-18.04-amd64

9

Analysis

  • max time kernel
    149s
  • max time network
    149s
  • platform
    ubuntu-18.04_amd64
  • resource
    ubuntu1804-amd64-20260126-en
  • resource tags

    arch:amd64arch:i386image:ubuntu1804-amd64-20260126-enkernel:4.15.0-213-genericlocale:en-usos:ubuntu-18.04-amd64system
  • submitted
    18/04/2026, 17:28

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General

  • Target
    x86.elf
  • Size 132KB
  • Sample260418-v2aekscz9w
  • SHA256 0547ae658e5383989fcf75408e813c491da48342dfd32bf76e051c969ddd527f
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
9/10
discoveryexecutionpersistenceprivilege_escalation

Malware Config

Signatures

  • Contacts a large (4103) amount of remote hosts 1 TTPs

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

    discovery
  • Unexpected DNS network traffic destination 64 IoCs

    Network traffic to other servers than the configured DNS servers was detected on the DNS port.

  • Creates a large amount of network flows 1 TTPs

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

    discovery
  • Creates/modifies Cron job 1 TTPs 1 IoCs

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

    executionpersistenceprivilege_escalation
  • Enumerates active TCP sockets 1 TTPs 1 IoCs

    Gets active TCP sockets from /proc virtual filesystem.

    discovery
  • Enumerates running processes

    Discovers information about currently running processes on the system

  • Modifies rc script 2 TTPs 1 IoCs

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

    persistence
  • Write file to user bin folder 1 IoCs
    persistence
  • Changes its process name 2 IoCs
  • Reads system network configuration 1 TTPs 1 IoCs

    Uses contents of /proc filesystem to enumerate network settings.

    discovery
  • Reads runtime system information 64 IoCs

    Reads data from /proc virtual filesystem.

    discovery

Processes

  • /tmp/x86.elf
    /tmp/x86.elf
    1⤵
    • Enumerates active TCP sockets
    • Modifies rc script
    • Write file to user bin folder
    • Changes its process name
    • Reads system network configuration
    • Reads runtime system information
    PID:1512
    • /bin/sh
      sh -c "(crontab -l; echo '@reboot /usr/local/bin/cFJmWIMCGdM') | crontab -"
      2⤵
        PID:1515
        • /usr/bin/crontab
          crontab -
          3⤵
          • Creates/modifies Cron job
          PID:1517
        • /usr/bin/crontab
          crontab -l
          3⤵
            PID:1518
        • /bin/sh
          sh -c "iptables -A INPUT -p tcp --dport 26721 -j ACCEPT"
          2⤵
            PID:1521
            • /sbin/iptables
              iptables -A INPUT -p tcp --dport 26721 -j ACCEPT
              3⤵
                PID:1522
            • /bin/sh
              sh -c "/bin/busybox iptables -A INPUT -p tcp --dport 26721 -j ACCEPT"
              2⤵
                PID:1527
                • /bin/busybox
                  /bin/busybox iptables -A INPUT -p tcp --dport 26721 -j ACCEPT
                  3⤵
                    PID:1528
                • /bin/sh
                  sh -c "/bin/iptables -A INPUT -p tcp --dport 26721 -j ACCEPT"
                  2⤵
                    PID:1529
                    • /bin/iptables
                      /bin/iptables -A INPUT -p tcp --dport 26721 -j ACCEPT
                      3⤵
                        PID:1530
                    • /bin/sh
                      sh -c "/usr/bin/iptables -A INPUT -p tcp --dport 26721 -j ACCEPT"
                      2⤵
                        PID:1531
                        • /usr/bin/iptables
                          /usr/bin/iptables -A INPUT -p tcp --dport 26721 -j ACCEPT
                          3⤵
                            PID:1532
                        • /bin/sh
                          sh -c "busybox iptables -A INPUT -p tcp --dport 26721 -j ACCEPT"
                          2⤵
                            PID:1533
                            • /bin/busybox
                              busybox iptables -A INPUT -p tcp --dport 26721 -j ACCEPT
                              3⤵
                                PID:1534

                          Network

                                MITRE ATT&CK Enterprise v16

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                                Downloads

                                cFJmWIMCGdM
                                • Path /usr/local/bin/cFJmWIMCGdM
                                • Size 132KB
                                • SHA256 0547ae658e5383989fcf75408e813c491da48342dfd32bf76e051c969ddd527f
                                • MD5 SHA1 SHA512 SSDEEP TLSH
                                Submit Download

                                tmp.kwK5yR
                                • Path /var/spool/cron/crontabs/tmp.kwK5yR
                                • Size 210B
                                • SHA256 a85245b1b55cce4a0e045a3d1cc650d8cada9a370b173f9ddb588e7d6f940dfa
                                • MD5 SHA1 SHA512 TLSH
                                Submit Download