Linux Analysis Report
na.elf

Overview

General Information

Sample name: na.elf
Analysis ID: 1532529
MD5: 23f684775cd0ec77dbac5d3b06eaa2a3
SHA1: 1c5dc968afd80b8641c7184a2ff5ab7072de33a7
SHA256: bb7b5ef114c9ab567852caa806c03672cac7aa3ef1c855609cba74c1b5d77957
Tags: elfuser-abuse_ch
Infos:

Detection

Score: 60
Range: 0 - 100
Whitelisted: false

Signatures

Multi AV Scanner detection for submitted file
Connects to many ports of the same IP (likely port scanning)
Deletes system log files
Sample tries to access files in /etc/config/ (typical for OpenWRT routers)
Creates hidden files and/or directories
Detected TCP or UDP traffic on non-standard ports
Executes the "systemctl" command used for controlling the systemd system and service manager
Found strings indicative of a multi-platform dropper
Reads system version information
Sample has stripped symbol table
Sample listens on a socket
Sample tries to kill a process (SIGKILL)
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: 21%
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/

Networking
barindex
Connects to many ports of the same IP (likely port scanning)
Source: global traffic TCP traffic: 38.60.249.66 ports 3,4,6,7,9,49376
Detected TCP or UDP traffic on non-standard ports
Source: global traffic TCP traffic: 192.168.2.13:33626 -> 38.60.249.66:49376
Sample listens on a socket
Source: /tmp/na.elf (PID: 5721) Socket: 127.0.0.1:1234 Jump to behavior
Source: unknown TCP traffic detected without corresponding DNS query: 38.60.249.66
Source: unknown TCP traffic detected without corresponding DNS query: 38.60.249.66
Source: unknown TCP traffic detected without corresponding DNS query: 38.60.249.66
Source: unknown TCP traffic detected without corresponding DNS query: 38.60.249.66
Source: unknown TCP traffic detected without corresponding DNS query: 38.60.249.66
Source: unknown TCP traffic detected without corresponding DNS query: 38.60.249.66
Source: unknown TCP traffic detected without corresponding DNS query: 38.60.249.66
Source: unknown TCP traffic detected without corresponding DNS query: 38.60.249.66
Source: unknown TCP traffic detected without corresponding DNS query: 38.60.249.66
Source: unknown TCP traffic detected without corresponding DNS query: 38.60.249.66
Source: unknown TCP traffic detected without corresponding DNS query: 38.60.249.66
Source: unknown UDP traffic detected without corresponding DNS query: 116.203.104.203
Source: global traffic DNS traffic detected: DNS query: daisy.ubuntu.com
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: 5723) SIGKILL sent: pid: 1692, result: successful Jump to behavior
Source: classification engine Classification label: mal60.troj.evad.linELF@0/0@2/0

Data Obfuscation
barindex
Sample tries to access files in /etc/config/ (typical for OpenWRT routers)
Source: /tmp/na.elf (PID: 5724) File: /etc/config Jump to behavior
Creates hidden files and/or directories
Source: /tmp/na.elf (PID: 5724) Directory: /root/.cache Jump to behavior
Source: /tmp/na.elf (PID: 5724) Directory: /root/.ssh Jump to behavior
Source: /tmp/na.elf (PID: 5724) Directory: /root/.config Jump to behavior
Source: /tmp/na.elf (PID: 5724) Directory: /root/.local Jump to behavior
Source: /tmp/na.elf (PID: 5724) Directory: /tmp/.X11-unix Jump to behavior
Source: /tmp/na.elf (PID: 5724) Directory: /tmp/.Test-unix Jump to behavior
Source: /tmp/na.elf (PID: 5724) Directory: /tmp/.font-unix Jump to behavior
Source: /tmp/na.elf (PID: 5724) Directory: /tmp/.ICE-unix Jump to behavior
Source: /tmp/na.elf (PID: 5724) Directory: /tmp/.XIM-unix Jump to behavior
Source: /tmp/na.elf (PID: 5724) Directory: /etc/.java Jump to behavior
Executes the "systemctl" command used for controlling the systemd system and service manager
Source: /usr/lib/snapd/snap-failure (PID: 5746) Systemctl executable: /usr/bin/systemctl -> systemctl stop snapd.socket Jump to behavior
Reads system version information
Source: /usr/lib/snapd/snap-failure (PID: 5732) Reads version info: /proc/version Jump to behavior

Hooking and other Techniques for Hiding and Protection
barindex
Deletes system log files
Source: /tmp/na.elf (PID: 5724) Log files deleted: /var/log/kern.log Jump to behavior
Uses the "uname" system call to query kernel version information (possible evasion)
Source: /tmp/na.elf (PID: 5721) Queries kernel information via 'uname': Jump to behavior
Source: na.elf, 5721.1.00005585d0fd9000.00005585d1089000.rw-.sdmp Binary or memory string: !/etc/qemu-binfmt/ppc1
Source: na.elf, 5721.1.00007fffe29a8000.00007fffe29c9000.rw-.sdmp Binary or memory string: x86_64/usr/bin/qemu-ppc/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, 5721.1.00005585d0fd9000.00005585d1089000.rw-.sdmp Binary or memory string: /etc/qemu-binfmt/ppc
Source: na.elf, 5721.1.00007fffe29a8000.00007fffe29c9000.rw-.sdmp Binary or memory string: /usr/bin/qemu-ppc

No Screenshots

  • No. of IPs < 25%
  • 25% < No. of IPs < 50%
  • 50% < No. of IPs < 75%
  • 75% < No. of IPs

Contacted Public IPs

IP Domain Country Flag ASN ASN Name Malicious
116.203.104.203
 unknown Germany
24940 HETZNER-ASDE false
38.60.249.66
 unknown United States
174 COGENT-174US true

Contacted Domains

Name IP Active
daisy.ubuntu.com 162.213.35.25 true