Linux Analysis Report
na.elf

Overview

General Information

Sample name: na.elf
Analysis ID: 1530549
MD5: a089784465bf00170de07fba33cfcd64
SHA1: 70232249f8aa23657b401c2b87dfc1d8bd0b145a
SHA256: f2215fa6d1b7eb3e43fd85348f1feba29e09e129de4cb7c3596ae7d270d6916f
Tags: elfuser-abuse_ch
Infos:

Detection

Score: 64
Range: 0 - 100
Whitelisted: false

Signatures

Antivirus / Scanner detection for submitted sample
Multi AV Scanner detection for submitted file
Deletes system log files
Sample tries to access files in /etc/config/ (typical for OpenWRT routers)
Creates hidden files and/or directories
Found strings indicative of a multi-platform dropper
Sample has stripped symbol table
Sample listens on a socket
Sample tries to kill a process (SIGKILL)
Sleeps for long times indicative of sandbox evasion
Uses the "uname" system call to query kernel version information (possible evasion)

Classification

AV Detection
barindex
Antivirus / Scanner detection for submitted sample
Source: na.elf Avira: detected
Multi AV Scanner detection for submitted file
Source: na.elf Virustotal: Detection: 24% Perma Link
Source: na.elf ReversingLabs: Detection: 23%
Found strings indicative of a multi-platform dropper
Source: na.elf String: ash|login|wget|curl|tftp|ntpdate
Source: na.elf String: /proc//exe|ash|login|wget|curl|tftp|ntpdate/fdsocket|proc/usr/bin/usr/sbin/system/mnt/mtd/app/org/z/zbin/home/app/dvr/bin/duksan/userfs/mnt/app/usr/etc/dvr/main/usr/local/var/bin/tmp/sqfs/z/bin/dvr/mnt/mtd/zconf/gm/bin/home/process/var/challenge/usr/lib/lib/systemd//usr/lib/systemd/system/system/bin//mnt//home/helper/home/davinci/usr/libexec//sbin//bin/
Sample listens on a socket
Source: /tmp/na.elf (PID: 5430) Socket: 127.0.0.1:1234 Jump to behavior
Sample has stripped symbol table
Source: ELF static info symbol of initial sample .symtab present: no
Sample tries to kill a process (SIGKILL)
Source: /tmp/na.elf (PID: 5478) SIGKILL sent: pid: 5476, result: successful Jump to behavior
Source: classification engine Classification label: mal64.evad.linELF@0/0@0/0

Data Obfuscation
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Sample tries to access files in /etc/config/ (typical for OpenWRT routers)
Source: /tmp/na.elf (PID: 5441) File: /etc/config Jump to behavior
Creates hidden files and/or directories
Source: /tmp/na.elf (PID: 5441) Directory: /root/.cache Jump to behavior
Source: /tmp/na.elf (PID: 5441) Directory: /root/.ssh Jump to behavior
Source: /tmp/na.elf (PID: 5441) Directory: /root/.config Jump to behavior
Source: /tmp/na.elf (PID: 5441) Directory: /root/.local Jump to behavior
Source: /tmp/na.elf (PID: 5441) Directory: /tmp/.X11-unix Jump to behavior
Source: /tmp/na.elf (PID: 5441) Directory: /tmp/.Test-unix Jump to behavior
Source: /tmp/na.elf (PID: 5441) Directory: /tmp/.font-unix Jump to behavior
Source: /tmp/na.elf (PID: 5441) Directory: /tmp/.ICE-unix Jump to behavior
Source: /tmp/na.elf (PID: 5441) Directory: /tmp/.XIM-unix Jump to behavior
Source: /tmp/na.elf (PID: 5441) Directory: /etc/.java Jump to behavior

Hooking and other Techniques for Hiding and Protection
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Deletes system log files
Source: /tmp/na.elf (PID: 5441) Log files deleted: /var/log/kern.log Jump to behavior
Sleeps for long times indicative of sandbox evasion
Source: /tmp/na.elf (PID: 5478) Sleeps longer then 60s: 60.0s Jump to behavior
Uses the "uname" system call to query kernel version information (possible evasion)
Source: /tmp/na.elf (PID: 5430) Queries kernel information via 'uname': Jump to behavior
Source: na.elf, 5430.1.00007fff50b28000.00007fff50b49000.rw-.sdmp, na.elf, 5476.1.00007fff50b28000.00007fff50b49000.rw-.sdmp, na.elf, 5478.1.00007fff50b28000.00007fff50b49000.rw-.sdmp Binary or memory string: x86_64/usr/bin/qemu-mips/tmp/na.elfSUDO_USER=saturninoPATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/binDISPLAY=:1.0XAUTHORITY=/run/user/1000/gdm/XauthoritySUDO_UID=1000TERM=xterm-256colorCOLORTERM=truecolorLOGNAME=rootUSER=rootLANG=en_US.UTF-8SUDO_COMMAND=/bin/bashHOME=/rootMAIL=/var/mail/rootSUDO_GID=1000SHELL=/bin/bash/tmp/na.elf
Source: na.elf, 5430.1.000055813a023000.000055813a0cb000.rw-.sdmp, na.elf, 5476.1.000055813a023000.000055813a0cb000.rw-.sdmp, na.elf, 5478.1.000055813a023000.000055813a0cb000.rw-.sdmp Binary or memory string: U!/etc/qemu-binfmt/mips
Source: na.elf, 5430.1.000055813a023000.000055813a0cb000.rw-.sdmp, na.elf, 5476.1.000055813a023000.000055813a0cb000.rw-.sdmp, na.elf, 5478.1.000055813a023000.000055813a0cb000.rw-.sdmp Binary or memory string: /etc/qemu-binfmt/mips
Source: na.elf, 5430.1.00007fff50b28000.00007fff50b49000.rw-.sdmp, na.elf, 5476.1.00007fff50b28000.00007fff50b49000.rw-.sdmp, na.elf, 5478.1.00007fff50b28000.00007fff50b49000.rw-.sdmp Binary or memory string: /usr/bin/qemu-mips

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