Analysis
- max time kernel
148s - max time network
150s - platform
ubuntu-18.04_amd64 - resource
ubuntu1804-amd64-20251218-en - resource tags
- submitted
22/12/2025, 01:47
General
- Target x86_32.uhavenobotsxd.elf
- Size 85KB
- Sample251222-b7pxnsel21
- SHA256 99c3e31628d4c1e5ffc94be945d4aaa0a4a0577565f6578dc7f4db8d10e9dfca
Malware Config
Signatures
- Executes dropped EXE 6 IoCs
- Unexpected DNS network traffic destination 4 IoCs
Network traffic to other servers than the configured DNS servers was detected on the DNS port.
- Creates/modifies Cron job 1 TTPs 4 IoCs
Cron allows running tasks on a schedule, and is commonly used for malware persistence.
- Creates/modifies environment variables 1 TTPs 2 IoCs
Creating/modifying environment variables is a common persistence mechanism.
- Deletes log files 1 TTPs 3 IoCs
Deletes log files on the system.
- Enumerates running processes
Discovers information about currently running processes on the system
- Modifies init.d 2 TTPs 4 IoCs
Adds/modifies system service, likely for persistence.
- Modifies rc script 2 TTPs 2 IoCs
Adding/modifying system rc scripts is a common persistence mechanism.
- Write file to user bin folder 1 IoCs
- Modifies Bash startup script 2 TTPs 2 IoCs
- Changes its process name 5 IoCs
- Reads runtime system information 64 IoCs
Reads data from /proc virtual filesystem.
- Writes file to shm directory 1 IoCs
Malware can drop malicious files in the shm directory which will run directly from RAM.
Processes
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/tmp/x86_32.uhavenobotsxd.elf/tmp/x86_32.uhavenobotsxd.elf1⤵
- Creates/modifies Cron job
- Creates/modifies environment variables
- Deletes log files
- Modifies init.d
- Modifies rc script
- Modifies Bash startup script
- Changes its process name
- Reads runtime system information
- Writes file to shm directory
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/bin/shsh -c "rm -f /var/.update /var/tmp/.update /var/log/.update 2>/dev/null"2⤵
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/bin/rmrm -f /var/.update /var/tmp/.update /var/log/.update3⤵
- Deletes log files
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/bin/shsh -c "rm -f /mnt/.update /media/.update /home/.update /root/.update 2>/dev/null"2⤵
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/bin/rmrm -f /mnt/.update /media/.update /home/.update /root/.update3⤵
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/bin/shsh -c "rm -f /usr/bin/.update /bin/.update 2>/dev/null"2⤵
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/bin/rmrm -f /usr/bin/.update /bin/.update3⤵
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/bin/shsh -c "rm -f /etc/init.d/S99system /etc/init.d/S99network 2>/dev/null"2⤵
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/bin/rmrm -f /etc/init.d/S99system /etc/init.d/S99network3⤵
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/bin/shsh -c "rm -f /etc/init.d/S99backup0 /etc/init.d/S99backup1 /etc/init.d/S99backup2 2>/dev/null"2⤵
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/bin/rmrm -f /etc/init.d/S99backup0 /etc/init.d/S99backup1 /etc/init.d/S99backup23⤵
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/bin/shsh -c "rm -f /etc/rc*.d/S99system /etc/rc*.d/S99network 2>/dev/null"2⤵
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/bin/rmrm -f "/etc/rc*.d/S99system" "/etc/rc*.d/S99network"3⤵
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/bin/shsh -c "rm -f /etc/rc*.d/S99backup* 2>/dev/null"2⤵
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/bin/rmrm -f "/etc/rc*.d/S99backup*"3⤵
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/bin/shsh -c "rm -f /var/.monitor /var/tmp/.monitor /tmp/.monitor 2>/dev/null"2⤵
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/bin/rmrm -f /var/.monitor /var/tmp/.monitor /tmp/.monitor3⤵
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/bin/shsh -c "rm -f /mnt/.monitor /media/.monitor /home/.monitor /root/.monitor 2>/dev/null"2⤵
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/bin/rmrm -f /mnt/.monitor /media/.monitor /home/.monitor /root/.monitor3⤵
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/bin/shsh -c "killall -9 .update 2>/dev/null"2⤵
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/usr/bin/killallkillall -9 .update3⤵
- Reads runtime system information
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/bin/shsh -c "killall -9 .monitor 2>/dev/null"2⤵
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/usr/bin/killallkillall -9 .monitor3⤵
- Reads runtime system information
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/bin/shsh -c "cp -f /tmp/x86_32.uhavenobotsxd.elf /usr/bin/.update 2>/dev/null"2⤵
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/bin/cpcp -f /tmp/x86_32.uhavenobotsxd.elf /usr/bin/.update3⤵
- Write file to user bin folder
- Reads runtime system information
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/bin/shsh -c "(crontab -l 2>/dev/null; echo '* * * * * /usr/bin/.update startup') | crontab - 2>/dev/null"2⤵
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/usr/bin/crontabcrontab -3⤵
- Creates/modifies Cron job
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/usr/bin/crontabcrontab -l3⤵
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/bin/shsh -c "kill -HUP 1 2>/dev/null"2⤵
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/bin/shsh -c "/etc/init.d/S99network start > /dev/null 2>&1 &"2⤵
- Executes dropped EXE
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/bin/shsh -c "/run/user/0/.monitor > /dev/null 2>&1 &"2⤵
- Executes dropped EXE
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/bin/shsh -c "/usr/bin/.update startup &"2⤵
- Executes dropped EXE
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/bin/shsh -c "/usr/bin/.update startup &"2⤵
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/bin/shsh -c "/usr/bin/.update startup &"2⤵
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/bin/shsh -c "/usr/bin/.update startup &"2⤵
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/etc/init.d/S99network/etc/init.d/S99network start1⤵
- Executes dropped EXE
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/usr/bin/.update/usr/bin/.update startup2⤵
- Changes its process name
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/bin/sleepsleep 602⤵
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/bin/sleepsleep 602⤵
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/usr/bin/.update/usr/bin/.update startup2⤵
- Changes its process name
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/bin/sleepsleep 602⤵
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/usr/bin/.update/usr/bin/.update startup2⤵
- Changes its process name
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/run/user/0/.monitor/run/user/0/.monitor1⤵
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/usr/bin/.update/usr/bin/.update startup1⤵
- Changes its process name
- Reads runtime system information
Network
MITRE ATT&CK Enterprise v16
Persistence
Boot or Logon Autostart Execution
3Boot or Logon Initialization Scripts
2RC Scripts
2Event 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
3Boot or Logon Initialization Scripts
2RC Scripts
2Event 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
S99network
S99system
rcS
inittab
.update
root
tmp.LIduv2