Linux Analysis Report
arm5.elf

Overview

General Information

Sample name: arm5.elf
Analysis ID: 1417377
MD5: b7176e4d355ae95c4788a36f369282b9
SHA1: a9805ce346d7809a05855638fae9c8ba166105f3
SHA256: 0b945860268995e0ed54391a7b63bacb3cad9f2daeacf6c20fd46cc9ae4c6c81
Infos:

Detection

Mirai
Score: 64
Range: 0 - 100
Whitelisted: false

Signatures

Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
Yara detected Mirai
Executes the "rm" command used to delete files or directories
Sample has stripped symbol table
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
barindex
Multi AV Scanner detection for submitted file
Source: arm5.elf ReversingLabs: Detection: 64%
Source: unknown TCP traffic detected without corresponding DNS query: 54.171.230.55
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: 34.249.145.219
Source: unknown TCP traffic detected without corresponding DNS query: 34.249.145.219
Source: unknown TCP traffic detected without corresponding DNS query: 34.249.145.219
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: 34.249.145.219
Source: unknown Network traffic detected: HTTP traffic on port 443 -> 39242
Source: unknown Network traffic detected: HTTP traffic on port 33606 -> 443
Source: unknown Network traffic detected: HTTP traffic on port 43928 -> 443
Source: unknown Network traffic detected: HTTP traffic on port 39242 -> 443
Source: unknown Network traffic detected: HTTP traffic on port 42836 -> 443

System Summary
barindex
Malicious sample detected (through community Yara rule)
Source: arm5.elf, type: SAMPLE Matched rule: Linux_Trojan_Gafgyt_28a2fe0c Author: unknown
Source: 6210.1.00007f82dc017000.00007f82dc022000.r-x.sdmp, type: MEMORY Matched rule: Linux_Trojan_Gafgyt_28a2fe0c Author: unknown
Source: Process Memory Space: arm5.elf PID: 6210, 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: arm5.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: 6210.1.00007f82dc017000.00007f82dc022000.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: arm5.elf PID: 6210, 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: mal64.troj.linELF@0/0@0/0
Executes the "rm" command used to delete files or directories
Source: /usr/bin/dash (PID: 6271) Rm executable: /usr/bin/rm -> rm -f /tmp/tmp.Hd3Ch0xuAa /tmp/tmp.iRdiomyrrx /tmp/tmp.REaFxVXqrl Jump to behavior
Source: /usr/bin/dash (PID: 6272) Rm executable: /usr/bin/rm -> rm -f /tmp/tmp.Hd3Ch0xuAa /tmp/tmp.iRdiomyrrx /tmp/tmp.REaFxVXqrl Jump to behavior
Uses the "uname" system call to query kernel version information (possible evasion)
Source: /tmp/arm5.elf (PID: 6210) Queries kernel information via 'uname': Jump to behavior
Source: arm5.elf, 6210.1.00007ffde7ef1000.00007ffde7f12000.rw-.sdmp Binary or memory string: x86_64/usr/bin/qemu-arm/tmp/arm5.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/arm5.elf
Source: arm5.elf, 6210.1.00005586252d4000.0000558625402000.rw-.sdmp Binary or memory string: U!/etc/qemu-binfmt/arm
Source: arm5.elf, 6210.1.00007ffde7ef1000.00007ffde7f12000.rw-.sdmp Binary or memory string: qemu: %s: %s
Source: arm5.elf, 6210.1.00007ffde7ef1000.00007ffde7f12000.rw-.sdmp Binary or memory string: leqemu: %s: %s
Source: arm5.elf, 6210.1.00005586252d4000.0000558625402000.rw-.sdmp Binary or memory string: Urg.qemu.gdb.arm.sys.regs">
Source: arm5.elf, 6210.1.00005586252d4000.0000558625402000.rw-.sdmp Binary or memory string: /etc/qemu-binfmt/arm
Source: arm5.elf, 6210.1.00007ffde7ef1000.00007ffde7f12000.rw-.sdmp Binary or memory string: /usr/bin/qemu-arm
Source: arm5.elf, 6210.1.00005586252d4000.0000558625402000.rw-.sdmp Binary or memory string: rg.qemu.gdb.arm.sys.regs">

Stealing of Sensitive Information
barindex
Yara detected Mirai
Source: Yara match File source: arm5.elf, type: SAMPLE
Source: Yara match File source: 6210.1.00007f82dc017000.00007f82dc022000.r-x.sdmp, type: MEMORY

Remote Access Functionality
barindex
Yara detected Mirai
Source: Yara match File source: arm5.elf, type: SAMPLE
Source: Yara match File source: 6210.1.00007f82dc017000.00007f82dc022000.r-x.sdmp, type: MEMORY
windows-stand
  • 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
54.171.230.55
 unknown United States
16509 AMAZON-02US false
34.249.145.219
 unknown United States
16509 AMAZON-02US 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