Linux Analysis Report
sh4.elf

Overview

General Information

Sample name: sh4.elf
Analysis ID: 1566407
MD5: b0d7c4a1edfc03778330c4ce5ea30b8c
SHA1: 2a0d222530b9031b6a8cf20b0ac0a092f0f53aa3
SHA256: cd46d1feab7377a870427243c604dc717af9e56db242197dfab5eb8f482fd008
Tags: elfuser-abuse_ch
Infos:

Detection

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

Signatures

Antivirus / Scanner detection for submitted sample
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
Yara detected Mirai
Detected TCP or UDP traffic on non-standard ports
Sample has stripped symbol table
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)
Yara signature match

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
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Antivirus / Scanner detection for submitted sample
Source: sh4.elf Avira: detected
Multi AV Scanner detection for submitted file
Source: sh4.elf ReversingLabs: Detection: 63%
Source: sh4.elf Virustotal: Detection: 60% Perma Link
Detected TCP or UDP traffic on non-standard ports
Source: global traffic TCP traffic: 192.168.2.23:32770 -> 85.239.34.134:2132
Sample listens on a socket
Source: /tmp/sh4.elf (PID: 6239) Socket: 127.0.0.1:57186 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: 85.239.34.134
Source: unknown TCP traffic detected without corresponding DNS query: 85.239.34.134
Source: unknown TCP traffic detected without corresponding DNS query: 85.239.34.134
Source: unknown TCP traffic detected without corresponding DNS query: 85.239.34.134
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: 85.239.34.134
Source: unknown TCP traffic detected without corresponding DNS query: 85.239.34.134
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: 85.239.34.134
Source: unknown TCP traffic detected without corresponding DNS query: 85.239.34.134
Source: unknown Network traffic detected: HTTP traffic on port 43928 -> 443
Source: unknown Network traffic detected: HTTP traffic on port 42836 -> 443

System Summary
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Malicious sample detected (through community Yara rule)
Source: sh4.elf, type: SAMPLE Matched rule: Linux_Trojan_Gafgyt_28a2fe0c Author: unknown
Source: 6239.1.00007f57e4400000.00007f57e4411000.r-x.sdmp, type: MEMORY Matched rule: Linux_Trojan_Gafgyt_28a2fe0c Author: unknown
Source: Process Memory Space: sh4.elf PID: 6239, type: MEMORYSTR Matched rule: Linux_Trojan_Gafgyt_28a2fe0c Author: unknown
Sample has stripped symbol table
Source: ELF static info symbol of initial sample .symtab present: no
Yara signature match
Source: sh4.elf, type: SAMPLE Matched rule: Linux_Trojan_Gafgyt_28a2fe0c os = linux, severity = x86, creation_date = 2021-01-12, scan_context = file, memory, license = Elastic License v2, threat_name = Linux.Trojan.Gafgyt, fingerprint = a2c6beaec18ca876e8487c11bcc7a29279669588aacb7d3027d8d8df8f5bcead, id = 28a2fe0c-eed5-4c79-81e6-3b11b73a4ebd, last_modified = 2021-09-16
Source: 6239.1.00007f57e4400000.00007f57e4411000.r-x.sdmp, type: MEMORY Matched rule: Linux_Trojan_Gafgyt_28a2fe0c os = linux, severity = x86, creation_date = 2021-01-12, scan_context = file, memory, license = Elastic License v2, threat_name = Linux.Trojan.Gafgyt, fingerprint = a2c6beaec18ca876e8487c11bcc7a29279669588aacb7d3027d8d8df8f5bcead, id = 28a2fe0c-eed5-4c79-81e6-3b11b73a4ebd, last_modified = 2021-09-16
Source: Process Memory Space: sh4.elf PID: 6239, type: MEMORYSTR Matched rule: Linux_Trojan_Gafgyt_28a2fe0c os = linux, severity = x86, creation_date = 2021-01-12, scan_context = file, memory, license = Elastic License v2, threat_name = Linux.Trojan.Gafgyt, fingerprint = a2c6beaec18ca876e8487c11bcc7a29279669588aacb7d3027d8d8df8f5bcead, id = 28a2fe0c-eed5-4c79-81e6-3b11b73a4ebd, last_modified = 2021-09-16
Source: classification engine Classification label: mal72.troj.linELF@0/0@0/0
Uses the "uname" system call to query kernel version information (possible evasion)
Source: /tmp/sh4.elf (PID: 6239) Queries kernel information via 'uname': Jump to behavior
Source: sh4.elf, 6239.1.00007ffcd6525000.00007ffcd6546000.rw-.sdmp Binary or memory string: /usr/bin/qemu-sh4
Source: sh4.elf, 6239.1.00005563e834c000.00005563e83af000.rw-.sdmp Binary or memory string: /etc/qemu-binfmt/sh4
Source: sh4.elf, 6239.1.00005563e834c000.00005563e83af000.rw-.sdmp Binary or memory string: cU5!/etc/qemu-binfmt/sh4
Source: sh4.elf, 6239.1.00007ffcd6525000.00007ffcd6546000.rw-.sdmp Binary or memory string: x86_64/usr/bin/qemu-sh4/tmp/sh4.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/sh4.elf

Stealing of Sensitive Information
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Yara detected Mirai
Source: Yara match File source: sh4.elf, type: SAMPLE
Source: Yara match File source: 6239.1.00007f57e4400000.00007f57e4411000.r-x.sdmp, type: MEMORY
Source: Yara match File source: Process Memory Space: sh4.elf PID: 6239, type: MEMORYSTR

Remote Access Functionality
barindex
Yara detected Mirai
Source: Yara match File source: sh4.elf, type: SAMPLE
Source: Yara match File source: 6239.1.00007f57e4400000.00007f57e4411000.r-x.sdmp, type: MEMORY
Source: Yara match File source: Process Memory Space: sh4.elf PID: 6239, type: MEMORYSTR

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
85.239.34.134
 unknown Russian Federation
134121 RAINBOW-HKRainbownetworklimitedHK false
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