Linux Analysis Report
armv5l.elf

Overview

General Information

Sample name: armv5l.elf
Analysis ID: 1546875
MD5: 896d1c0e0d19f17cd2608499c1429eaa
SHA1: b0bc28ae92637590802846bc2f6395fc4dc59cc5
SHA256: c581ab2ef043d45bd025dc44c4b941fe57c48d125664048de2f12c6250fc47cb
Tags: elfuser-abuse_ch
Infos:

Detection

Gafgyt, Mirai
Score: 80
Range: 0 - 100
Whitelisted: false

Signatures

Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
Yara detected Gafgyt
Yara detected Mirai
Opens /proc/net/* files useful for finding connected devices and routers
Sample is packed with UPX
Detected TCP or UDP traffic on non-standard ports
ELF contains segments with high entropy indicating compressed/encrypted content
Sample contains only a LOAD segment without any section mappings
Suricata IDS alerts with low severity for network traffic
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
Bashlite, Gafgyt Bashlite is a malware family which infects Linux systems in order to launch distributed denial-of-service attacks (DDoS). Originally it was also known under the name Bashdoor, but this term now refers to the exploit method used by the malware. It has been used to launch attacks of up to 400 Gbps. No Attribution https://malpedia.caad.fkie.fraunhofer.de/details/elf.bashlite
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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Multi AV Scanner detection for submitted file
Source: armv5l.elf ReversingLabs: Detection: 31%

Spreading
barindex
Opens /proc/net/* files useful for finding connected devices and routers
Source: /tmp/armv5l.elf (PID: 5433) Opens: /proc/net/route Jump to behavior
Detected TCP or UDP traffic on non-standard ports
Source: global traffic TCP traffic: 192.168.2.13:48486 -> 181.214.231.152:31130
Suricata IDS alerts with low severity for network traffic
Source: Network traffic Suricata IDS: 2848448 - Severity 1 - ETPRO MALWARE Possible ELF/Various IoT Bot Style Device Checkin (unknown) : 192.168.2.13:48486 -> 181.214.231.152:31130
Tries to connect to HTTP servers, but all servers are down (expired dropper behavior)
Source: global traffic TCP traffic: 192.168.2.13:48202 -> 185.125.190.26:443
Source: unknown TCP traffic detected without corresponding DNS query: 181.214.231.152
Source: unknown TCP traffic detected without corresponding DNS query: 181.214.231.152
Source: unknown TCP traffic detected without corresponding DNS query: 181.214.231.152
Source: unknown TCP traffic detected without corresponding DNS query: 185.125.190.26
Source: unknown TCP traffic detected without corresponding DNS query: 185.125.190.26
Source: global traffic DNS traffic detected: DNS query: daisy.ubuntu.com
Source: armv5l.elf, 5433.1.00007f0824017000.00007f0824064000.r-x.sdmp, armv5l.elf, 5435.1.00007f0824017000.00007f0824064000.r-x.sdmp String found in binary or memory: http://help.yahoo.com/help/us/ysearch/slurp)
Source: armv5l.elf String found in binary or memory: http://upx.sf.net
Source: armv5l.elf, 5435.1.00007f0824017000.00007f0824064000.r-x.sdmp String found in binary or memory: http://www.google.com/bot.html)
Source: armv5l.elf, 5435.1.00007f0824017000.00007f0824064000.r-x.sdmp String found in binary or memory: http://www.google.com/mobile/adsbot.html)
Source: armv5l.elf, 5433.1.00007f0824017000.00007f0824064000.r-x.sdmp, armv5l.elf, 5435.1.00007f0824017000.00007f0824064000.r-x.sdmp String found in binary or memory: http://www.spidersoft.com)
Source: armv5l.elf, 5435.1.00007f0824017000.00007f0824064000.r-x.sdmp String found in binary or memory: https://developers.google.com/search/docs/advanced/crawling/overview-google-crawlers)
Source: unknown Network traffic detected: HTTP traffic on port 48202 -> 443

System Summary
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Malicious sample detected (through community Yara rule)
Source: 5433.1.00007f0824017000.00007f0824064000.r-x.sdmp, type: MEMORY Matched rule: Linux_Trojan_Gafgyt_28a2fe0c Author: unknown
Source: 5433.1.00007f0824017000.00007f0824064000.r-x.sdmp, type: MEMORY Matched rule: Linux_Trojan_Gafgyt_ea92cca8 Author: unknown
Source: 5435.1.00007f0824017000.00007f0824064000.r-x.sdmp, type: MEMORY Matched rule: Linux_Trojan_Gafgyt_28a2fe0c Author: unknown
Source: 5435.1.00007f0824017000.00007f0824064000.r-x.sdmp, type: MEMORY Matched rule: Linux_Trojan_Gafgyt_ea92cca8 Author: unknown
Source: Process Memory Space: armv5l.elf PID: 5433, type: MEMORYSTR Matched rule: Linux_Trojan_Gafgyt_28a2fe0c Author: unknown
Source: Process Memory Space: armv5l.elf PID: 5433, type: MEMORYSTR Matched rule: Linux_Trojan_Gafgyt_ea92cca8 Author: unknown
Source: Process Memory Space: armv5l.elf PID: 5435, type: MEMORYSTR Matched rule: Linux_Trojan_Gafgyt_28a2fe0c Author: unknown
Source: Process Memory Space: armv5l.elf PID: 5435, type: MEMORYSTR Matched rule: Linux_Trojan_Gafgyt_ea92cca8 Author: unknown
Sample contains only a LOAD segment without any section mappings
Source: LOAD without section mappings Program segment: 0x8000
Yara signature match
Source: 5433.1.00007f0824017000.00007f0824064000.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: 5433.1.00007f0824017000.00007f0824064000.r-x.sdmp, type: MEMORY Matched rule: Linux_Trojan_Gafgyt_ea92cca8 os = linux, severity = x86, creation_date = 2021-01-12, scan_context = file, memory, license = Elastic License v2, threat_name = Linux.Trojan.Gafgyt, fingerprint = aa4aee9f3d6bedd8234eaf8778895a0f5d71c42b21f2a428f01f121e85704e8e, id = ea92cca8-bba7-4a1c-9b88-a2d051ad0021, last_modified = 2021-09-16
Source: 5435.1.00007f0824017000.00007f0824064000.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: 5435.1.00007f0824017000.00007f0824064000.r-x.sdmp, type: MEMORY Matched rule: Linux_Trojan_Gafgyt_ea92cca8 os = linux, severity = x86, creation_date = 2021-01-12, scan_context = file, memory, license = Elastic License v2, threat_name = Linux.Trojan.Gafgyt, fingerprint = aa4aee9f3d6bedd8234eaf8778895a0f5d71c42b21f2a428f01f121e85704e8e, id = ea92cca8-bba7-4a1c-9b88-a2d051ad0021, last_modified = 2021-09-16
Source: Process Memory Space: armv5l.elf PID: 5433, 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: Process Memory Space: armv5l.elf PID: 5433, type: MEMORYSTR Matched rule: Linux_Trojan_Gafgyt_ea92cca8 os = linux, severity = x86, creation_date = 2021-01-12, scan_context = file, memory, license = Elastic License v2, threat_name = Linux.Trojan.Gafgyt, fingerprint = aa4aee9f3d6bedd8234eaf8778895a0f5d71c42b21f2a428f01f121e85704e8e, id = ea92cca8-bba7-4a1c-9b88-a2d051ad0021, last_modified = 2021-09-16
Source: Process Memory Space: armv5l.elf PID: 5435, 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: Process Memory Space: armv5l.elf PID: 5435, type: MEMORYSTR Matched rule: Linux_Trojan_Gafgyt_ea92cca8 os = linux, severity = x86, creation_date = 2021-01-12, scan_context = file, memory, license = Elastic License v2, threat_name = Linux.Trojan.Gafgyt, fingerprint = aa4aee9f3d6bedd8234eaf8778895a0f5d71c42b21f2a428f01f121e85704e8e, id = ea92cca8-bba7-4a1c-9b88-a2d051ad0021, last_modified = 2021-09-16
Source: classification engine Classification label: mal80.spre.troj.evad.linELF@0/1@2/0

Data Obfuscation
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Sample is packed with UPX
Source: initial sample String containing UPX found: $Info: This file is packed with the UPX executable packer http://upx.sf.net $
Source: initial sample String containing UPX found: $Info: This file is packed with the UPX executable packer http://upx.sf.net $
Source: initial sample String containing UPX found: $Id: UPX 3.94 Copyright (C) 1996-2017 the UPX Team. All Rights Reserved. $
Source: /tmp/armv5l.elf (PID: 5433) Log file created: /tmp/Infected.log Jump to dropped file
ELF contains segments with high entropy indicating compressed/encrypted content
Source: armv5l.elf Submission file: segment LOAD with 7.9858 entropy (max. 8.0)
Uses the "uname" system call to query kernel version information (possible evasion)
Source: /tmp/armv5l.elf (PID: 5433) Queries kernel information via 'uname': Jump to behavior
Source: armv5l.elf, 5433.1.00005614097b5000.00005614099c3000.rw-.sdmp, armv5l.elf, 5435.1.00005614097b5000.00005614099c3000.rw-.sdmp Binary or memory string: /etc/qemu-binfmt/arm
Source: armv5l.elf, 5433.1.00005614097b5000.00005614099c3000.rw-.sdmp, armv5l.elf, 5435.1.00005614097b5000.00005614099c3000.rw-.sdmp Binary or memory string: V!/etc/qemu-binfmt/arm
Source: armv5l.elf, 5433.1.00007ffc044d5000.00007ffc044f6000.rw-.sdmp, armv5l.elf, 5435.1.00007ffc044d5000.00007ffc044f6000.rw-.sdmp Binary or memory string: /usr/bin/qemu-arm
Source: armv5l.elf, 5433.1.00007ffc044d5000.00007ffc044f6000.rw-.sdmp, armv5l.elf, 5435.1.00007ffc044d5000.00007ffc044f6000.rw-.sdmp Binary or memory string: x86_64/usr/bin/qemu-arm/tmp/armv5l.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/armv5l.elf

Stealing of Sensitive Information
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Yara detected Gafgyt
Source: Yara match File source: 5433.1.00007f0824017000.00007f0824064000.r-x.sdmp, type: MEMORY
Source: Yara match File source: 5435.1.00007f0824017000.00007f0824064000.r-x.sdmp, type: MEMORY
Yara detected Mirai
Source: Yara match File source: 5433.1.00007f0824017000.00007f0824064000.r-x.sdmp, type: MEMORY
Source: Yara match File source: 5435.1.00007f0824017000.00007f0824064000.r-x.sdmp, type: MEMORY
Source: Yara match File source: Process Memory Space: armv5l.elf PID: 5433, type: MEMORYSTR
Source: Yara match File source: Process Memory Space: armv5l.elf PID: 5435, type: MEMORYSTR

Remote Access Functionality
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Yara detected Gafgyt
Source: Yara match File source: 5433.1.00007f0824017000.00007f0824064000.r-x.sdmp, type: MEMORY
Source: Yara match File source: 5435.1.00007f0824017000.00007f0824064000.r-x.sdmp, type: MEMORY
Yara detected Mirai
Source: Yara match File source: 5433.1.00007f0824017000.00007f0824064000.r-x.sdmp, type: MEMORY
Source: Yara match File source: 5435.1.00007f0824017000.00007f0824064000.r-x.sdmp, type: MEMORY
Source: Yara match File source: Process Memory Space: armv5l.elf PID: 5433, type: MEMORYSTR
Source: Yara match File source: Process Memory Space: armv5l.elf PID: 5435, 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
181.214.231.152
 unknown Chile
61317 ASDETUKhttpwwwheficedcomGB false
185.125.190.26
 unknown United Kingdom
41231 CANONICAL-ASGB false

Contacted Domains

Name IP Active
daisy.ubuntu.com 162.213.35.25 true