Linux Analysis Report
arm7.elf

Overview

General Information

Sample name: arm7.elf
Analysis ID: 1528578
MD5: f314c4789d08e22f82ccce70bdf649b8
SHA1: cd311cd4f5b2fdff5ab97208d67b311f47891acb
SHA256: 60ccc1960f28cd5e89c5cd85c44c6a48b9fa83f3f176e3d39a3a0cfb45dd400d
Tags: user-elfdigest
Infos:

Detection

Mirai
Score: 72
Range: 0 - 100
Whitelisted: false

Signatures

Antivirus / Scanner detection for submitted sample
Multi AV Scanner detection for submitted file
Yara detected Mirai
Connects to many ports of the same IP (likely port scanning)
Contains symbols with names commonly found in malware
Detected TCP or UDP traffic on non-standard ports
Sample and/or dropped files contains symbols with suspicious names
Sample listens on a socket
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)

Classification

Name Description Attribution Blogpost URLs Link
Mirai Mirai is one of the first significant botnets targeting exposed networking devices running Linux. Found in August 2016 by MalwareMustDie, its name means "future" in Japanese. Nowadays it targets a wide range of networked embedded devices such as IP cameras, home routers (many vendors involved), and other IoT devices. Since the source code was published on "Hack Forums" many variants of the Mirai family appeared, infecting mostly home networks all around the world. No Attribution https://malpedia.caad.fkie.fraunhofer.de/details/elf.mirai

AV Detection
barindex
Antivirus / Scanner detection for submitted sample
Source: arm7.elf Avira: detected
Multi AV Scanner detection for submitted file
Source: arm7.elf ReversingLabs: Detection: 55%
Source: arm7.elf Virustotal: Detection: 61% Perma Link

Networking
barindex
Connects to many ports of the same IP (likely port scanning)
Source: global traffic TCP traffic: 93.123.39.105 ports 38241,1,2,3,4,8
Detected TCP or UDP traffic on non-standard ports
Source: global traffic TCP traffic: 192.168.2.23:49594 -> 93.123.39.105:38241
Sample listens on a socket
Source: /tmp/arm7.elf (PID: 6220) Socket: 127.0.0.1:2353 Jump to behavior
Tries to connect to HTTP servers, but all servers are down (expired dropper behavior)
Source: global traffic TCP traffic: 192.168.2.23:43928 -> 91.189.91.42:443
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: unknown TCP traffic detected without corresponding DNS query: 91.189.91.42
Source: unknown TCP traffic detected without corresponding DNS query: 91.189.91.43
Source: unknown TCP traffic detected without corresponding DNS query: 109.202.202.202
Source: unknown TCP traffic detected without corresponding DNS query: 91.189.91.42
Source: unknown TCP traffic detected without corresponding DNS query: 91.189.91.43
Source: unknown TCP traffic detected without corresponding DNS query: 109.202.202.202
Source: unknown TCP traffic detected without corresponding DNS query: 91.189.91.42
Source: unknown UDP traffic detected without corresponding DNS query: 80.152.203.134
Source: unknown UDP traffic detected without corresponding DNS query: 178.254.22.166
Source: unknown UDP traffic detected without corresponding DNS query: 152.53.15.127
Source: unknown UDP traffic detected without corresponding DNS query: 152.53.15.127
Source: global traffic DNS traffic detected: DNS query: enemybotnet.com
Source: unknown Network traffic detected: HTTP traffic on port 43928 -> 443
Source: unknown Network traffic detected: HTTP traffic on port 42836 -> 443

System Summary
barindex
Contains symbols with names commonly found in malware
Source: ELF static info symbol of initial sample Name: attack.c
Source: ELF static info symbol of initial sample Name: attack_get_opt_int
Source: ELF static info symbol of initial sample Name: attack_get_opt_ip
Source: ELF static info symbol of initial sample Name: attack_gre_eth
Source: ELF static info symbol of initial sample Name: attack_gre_ip
Source: ELF static info symbol of initial sample Name: attack_init
Source: ELF static info symbol of initial sample Name: attack_kill_all
Source: ELF static info symbol of initial sample Name: attack_ongoing
Source: ELF static info symbol of initial sample Name: attack_parse
Source: ELF static info symbol of initial sample Name: attack_start
Sample and/or dropped files contains symbols with suspicious names
Source: arm7.elf ELF static info symbol of initial sample: __gnu_unwind_execute
Source: classification engine Classification label: mal72.troj.linELF@0/0@4/0
Uses the "uname" system call to query kernel version information (possible evasion)
Source: /tmp/arm7.elf (PID: 6220) Queries kernel information via 'uname': Jump to behavior
Source: arm7.elf, 6220.1.000055f1870fd000.000055f18724f000.rw-.sdmp, arm7.elf, 6224.1.000055f1870fd000.000055f18722b000.rw-.sdmp Binary or memory string: U!/etc/qemu-binfmt/arm
Source: arm7.elf, 6220.1.000055f1870fd000.000055f18724f000.rw-.sdmp, arm7.elf, 6224.1.000055f1870fd000.000055f18722b000.rw-.sdmp Binary or memory string: /etc/qemu-binfmt/arm
Source: arm7.elf, 6220.1.00007fff34817000.00007fff34838000.rw-.sdmp, arm7.elf, 6224.1.00007fff34817000.00007fff34838000.rw-.sdmp Binary or memory string: /usr/bin/qemu-arm
Source: arm7.elf, 6220.1.00007fff34817000.00007fff34838000.rw-.sdmp, arm7.elf, 6224.1.00007fff34817000.00007fff34838000.rw-.sdmp Binary or memory string: x86_64/usr/bin/qemu-arm/tmp/arm7.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/arm7.elf

Stealing of Sensitive Information
barindex
Yara detected Mirai
Source: Yara match File source: arm7.elf, type: SAMPLE

Remote Access Functionality
barindex
Yara detected Mirai
Source: Yara match File source: arm7.elf, type: SAMPLE

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
93.123.39.105
 enemybotnet.com Bulgaria
43561 NET1-ASBG true
109.202.202.202
 unknown Switzerland
13030 INIT7CH false
91.189.91.43
 unknown United Kingdom
41231 CANONICAL-ASGB false
91.189.91.42
 unknown United Kingdom
41231 CANONICAL-ASGB false

Contacted Domains

Name IP Active
enemybotnet.com 93.123.39.105 true