Linux Analysis Report
na.elf

Overview

General Information

Sample name: na.elf
Analysis ID: 1528713
MD5: b1b2cfc6aa650c86d3fc36c5d97ffd9b
SHA1: 1cd1603f687141f8426309d91ce8d3a62e490a7e
SHA256: 018126389d78d622879924d688395499da7084b04861697c8df276b0c314748c
Tags: elfuser-abuse_ch
Infos:

Detection

Score: 56
Range: 0 - 100
Whitelisted: false

Signatures

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
Multi AV Scanner detection for submitted file
Source: na.elf ReversingLabs: Detection: 34%
Found strings indicative of a multi-platform dropper
Source: na.elf String: /proc//exewgetinitcurltftp/fdsocketproc/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: 5527) 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: 5578) SIGKILL sent: pid: 5535, result: successful Jump to behavior
Source: /tmp/na.elf (PID: 5580) SIGKILL sent: pid: 5578, result: successful Jump to behavior
Source: classification engine Classification label: mal56.evad.linELF@0/0@0/0

Data Obfuscation
barindex
Sample tries to access files in /etc/config/ (typical for OpenWRT routers)
Source: /tmp/na.elf (PID: 5531) File: /etc/config Jump to behavior
Creates hidden files and/or directories
Source: /tmp/na.elf (PID: 5531) Directory: /root/.cache Jump to behavior
Source: /tmp/na.elf (PID: 5531) Directory: /root/.ssh Jump to behavior
Source: /tmp/na.elf (PID: 5531) Directory: /root/.config Jump to behavior
Source: /tmp/na.elf (PID: 5531) Directory: /root/.local Jump to behavior
Source: /tmp/na.elf (PID: 5531) Directory: /tmp/.X11-unix Jump to behavior
Source: /tmp/na.elf (PID: 5531) Directory: /tmp/.Test-unix Jump to behavior
Source: /tmp/na.elf (PID: 5531) Directory: /tmp/.font-unix Jump to behavior
Source: /tmp/na.elf (PID: 5531) Directory: /tmp/.ICE-unix Jump to behavior
Source: /tmp/na.elf (PID: 5531) Directory: /tmp/.XIM-unix Jump to behavior
Source: /tmp/na.elf (PID: 5531) Directory: /etc/.java Jump to behavior

Hooking and other Techniques for Hiding and Protection
barindex
Deletes system log files
Source: /tmp/na.elf (PID: 5531) Log files deleted: /var/log/kern.log Jump to behavior
Sleeps for long times indicative of sandbox evasion
Source: /tmp/na.elf (PID: 5580) 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: 5527) Queries kernel information via 'uname': Jump to behavior
Source: na.elf, 5527.1.00007ffdea5ca000.00007ffdea5eb000.rw-.sdmp, na.elf, 5535.1.00007ffdea5ca000.00007ffdea5eb000.rw-.sdmp, na.elf, 5578.1.00007ffdea5ca000.00007ffdea5eb000.rw-.sdmp, na.elf, 5580.1.00007ffdea5ca000.00007ffdea5eb000.rw-.sdmp Binary or memory string: x86_64/usr/bin/qemu-arm/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, 5527.1.00005630fd751000.00005630fd89f000.rw-.sdmp, na.elf, 5535.1.00005630fd751000.00005630fd89f000.rw-.sdmp, na.elf, 5578.1.00005630fd751000.00005630fd89f000.rw-.sdmp, na.elf, 5580.1.00005630fd751000.00005630fd89f000.rw-.sdmp Binary or memory string: /etc/qemu-binfmt/arm
Source: na.elf, 5527.1.00005630fd751000.00005630fd89f000.rw-.sdmp, na.elf, 5535.1.00005630fd751000.00005630fd89f000.rw-.sdmp, na.elf, 5578.1.00005630fd751000.00005630fd89f000.rw-.sdmp, na.elf, 5580.1.00005630fd751000.00005630fd89f000.rw-.sdmp Binary or memory string: 0V!/etc/qemu-binfmt/arm
Source: na.elf, 5527.1.00007ffdea5ca000.00007ffdea5eb000.rw-.sdmp, na.elf, 5535.1.00007ffdea5ca000.00007ffdea5eb000.rw-.sdmp, na.elf, 5578.1.00007ffdea5ca000.00007ffdea5eb000.rw-.sdmp, na.elf, 5580.1.00007ffdea5ca000.00007ffdea5eb000.rw-.sdmp Binary or memory string: /usr/bin/qemu-arm
windows-stand
⊘No contacted IP infos