Overview

overview

7

Static

static

5

putita.x86.elf

ubuntu-18.04-amd64

7

Analysis

  • max time kernel
    148s
  • max time network
    147s
  • 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
    05/08/2026, 07:27

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General

  • Target
    putita.x86.elf
  • Size 62KB
  • Sample260805-jac6lsff73
  • SHA256 85a53e328463f0bdd53937585a176b1882ed00c4948025c3c795ed942f134a87
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
7/10
defense_evasiondiscoveryexecutionpersistenceprivilege_escalationupx

Malware Config

Signatures

  • Deletes itself 1 IoCs
  • Creates/modifies Cron job 1 TTPs 1 IoCs

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

    executionpersistenceprivilege_escalation
  • Creates/modifies environment variables 1 TTPs 8 IoCs

    Creating/modifying environment variables is a common persistence mechanism.

    persistenceprivilege_escalationdefense_evasion
  • Modifies init.d 2 TTPs 1 IoCs

    Adds/modifies system service, likely for persistence.

    persistence
  • Modifies rc script 2 TTPs 1 IoCs

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

    persistence
  • Modifies systemd 2 TTPs 1 IoCs

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

    persistenceprivilege_escalation
  • Modifies Bash startup script 2 TTPs 8 IoCs
    persistence
  • UPX packed file 1 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

    upx
  • Changes its process name 1 IoCs
  • Reads runtime system information 1 IoCs

    Reads data from /proc virtual filesystem.

    discovery

Processes

  • /tmp/putita.x86.elf
    /tmp/putita.x86.elf
    1⤵
    • Deletes itself
    • Creates/modifies environment variables
    • Modifies init.d
    • Modifies rc script
    • Modifies systemd
    • Modifies Bash startup script
    • Changes its process name
    • Reads runtime system information
    PID:1483
    • /bin/sh
      sh -c "crontab -l 2>/dev/null"
      2⤵
        PID:1484
        • /usr/bin/crontab
          crontab -l
          3⤵
            PID:1485
        • /bin/sh
          sh -c "(crontab -l 2>/dev/null; echo '@reboot /usr/lib/kworker-helper') | crontab - 2>/dev/null"
          2⤵
            PID:1486
            • /usr/bin/crontab
              crontab -
              3⤵
              • Creates/modifies Cron job
              PID:1488
            • /usr/bin/crontab
              crontab -l
              3⤵
                PID:1489
          • /bin/busybox
            chattr +i /etc/init.d/kworker-helper
            1⤵
              PID:1497
            • /bin/busybox
              chattr +i /etc/systemd/system/kworker-helper.service
              1⤵
                PID:1496
              • /usr/bin/chattr
                chattr +i /etc/systemd/system/kworker-helper.service
                1⤵
                  PID:1493
                • /bin/busybox
                  chattr +i /usr/lib/kworker-helper
                  1⤵
                    PID:1495
                  • /usr/bin/chattr
                    chattr +i /etc/init.d/kworker-helper
                    1⤵
                      PID:1494
                    • /usr/bin/chattr
                      chattr +i /usr/lib/kworker-helper
                      1⤵
                        PID:1492

                      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

                            4
                            T1547

                            XDG Autostart Entries

                            1
                            T1547.013

                            Boot or Logon Initialization Scripts

                            2
                            T1037

                            RC Scripts

                            2
                            T1037.004

                            Create or Modify System Process

                            1
                            T1543

                            Systemd Service

                            1
                            T1543.002

                            Event Triggered Execution

                            1
                            T1546

                            Unix Shell Configuration Modification

                            1
                            T1546.004

                            Hijack Execution Flow

                            1
                            T1574

                            Path Interception by PATH Environment Variable

                            1
                            T1574.007

                            Scheduled Task/Job

                            1
                            T1053

                            Cron

                            1
                            T1053.003

                            Privilege Escalation

                            Boot or Logon Autostart Execution

                            4
                            T1547

                            XDG Autostart Entries

                            1
                            T1547.013

                            Boot or Logon Initialization Scripts

                            2
                            T1037

                            RC Scripts

                            2
                            T1037.004

                            Create or Modify System Process

                            1
                            T1543

                            Systemd Service

                            1
                            T1543.002

                            Event Triggered Execution

                            1
                            T1546

                            Unix Shell Configuration Modification

                            1
                            T1546.004

                            Hijack Execution Flow

                            1
                            T1574

                            Path Interception by PATH Environment Variable

                            1
                            T1574.007

                            Scheduled Task/Job

                            1
                            T1053

                            Cron

                            1
                            T1053.003

                            Defense Evasion

                            Hijack Execution Flow

                            1
                            T1574

                            Path Interception by PATH Environment Variable

                            1
                            T1574.007

                            Credential Access

                            Discovery

                            Lateral Movement

                            Collection

                            Command and Control

                            Exfiltration

                            Impact

                            Replay Monitor

                            Loading Replay Monitor...

                            Downloads

                            kworker-helper
                            • Path /etc/init.d/kworker-helper
                            • Size 379B
                            • SHA256 daeb1a39fa3bf6fad15573d3aba269ac40fd43532bb487be2ed13453756cbe50
                            • MD5 SHA1 SHA512 TLSH
                            Submit Download

                            kworker-helper.service
                            • Path /etc/systemd/system/kworker-helper.service
                            • Size 190B
                            • SHA256 dcc492c83b938187ae12ae6df39f2350a98bb80761d79aa3ad4f29fa9a371c07
                            • MD5 SHA1 SHA512 TLSH
                            Submit Download

                            .ashrc
                            • Path /root/.ashrc
                            • Size 61B
                            • SHA256 30fc62ecc4fde897502efdd4821bd14c60694b758b6664f4044cfd48ca3a2efb
                            • MD5 SHA1 SHA512
                            Submit Download

                            kworker-helper
                            • Path /usr/lib/kworker-helper
                            • Size 62KB
                            • SHA256 85a53e328463f0bdd53937585a176b1882ed00c4948025c3c795ed942f134a87
                            • MD5 SHA1 SHA512 SSDEEP TLSH
                            Submit Download

                            tmp.PafT6Y
                            • Path /var/spool/cron/crontabs/tmp.PafT6Y
                            • Size 207B
                            • SHA256 493824876b2ad71f160f578c55e0d9f05b52eaf7b5695d9a60b34edd2cfbc90f
                            • MD5 SHA1 SHA512 TLSH
                            Submit Download