Linux Analysis Report
na.elf

Overview

General Information

Sample name: na.elf
Analysis ID: 1527078
MD5: 1bcebda20c0c2435fc35a22deea7de9f
SHA1: b468e8cb4a7257ed8fb0dc8636a49c8a501e47d0
SHA256: f765e905241ca2293c69bf35217d564c70c11c6a70fb5b91c62dbe1ce1f2a4e1
Tags: elfuser-abuse_ch
Infos:

Detection

Mirai, Moobot
Score: 100
Range: 0 - 100
Whitelisted: false

Signatures

Antivirus / Scanner detection for submitted sample
Detected Mirai
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
Suricata IDS alerts for network traffic
Yara detected Mirai
Yara detected Moobot
Sample deletes itself
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
Name Description Attribution Blogpost URLs Link
MooBot No Attribution https://malpedia.caad.fkie.fraunhofer.de/details/elf.moobot

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: 55%

Networking
barindex
Suricata IDS alerts for network traffic
Source: Network traffic Suricata IDS: 2030491 - Severity 1 - ET MALWARE ELF/MooBot Mirai DDoS Variant CnC Checkin M2 (Group String Len 2+) : 192.168.2.23:42074 -> 181.41.196.16:33006
Source: Network traffic Suricata IDS: 2030489 - Severity 1 - ET MALWARE ELF/MooBot Mirai DDoS Variant Server Response : 181.41.196.16:33006 -> 192.168.2.23:42074
Detected TCP or UDP traffic on non-standard ports
Source: global traffic TCP traffic: 192.168.2.23:42074 -> 181.41.196.16:33006
Sample listens on a socket
Source: /tmp/na.elf (PID: 6237) Socket: 0.0.0.0:25265 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: global traffic DNS traffic detected: DNS query: xz33006.h52l.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
Malicious sample detected (through community Yara rule)
Source: na.elf, type: SAMPLE Matched rule: Linux_Trojan_Gafgyt_28a2fe0c Author: unknown
Source: 6237.1.00007f93cc011000.00007f93cc021000.r-x.sdmp, type: MEMORY Matched rule: Linux_Trojan_Gafgyt_28a2fe0c Author: unknown
Source: Process Memory Space: na.elf PID: 6237, 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: na.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: 6237.1.00007f93cc011000.00007f93cc021000.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: na.elf PID: 6237, 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: mal100.troj.evad.linELF@0/0@1/0

Hooking and other Techniques for Hiding and Protection
barindex
Sample deletes itself
Source: /tmp/na.elf (PID: 6237) File: /tmp/na.elf Jump to behavior
Uses the "uname" system call to query kernel version information (possible evasion)
Source: /tmp/na.elf (PID: 6237) Queries kernel information via 'uname': Jump to behavior
Source: na.elf, 6237.1.000055dbb6ad9000.000055dbb6b3e000.rw-.sdmp Binary or memory string: /etc/qemu-binfmt/sparc
Source: na.elf, 6237.1.000055dbb6ad9000.000055dbb6b3e000.rw-.sdmp Binary or memory string: U!/etc/qemu-binfmt/sparc
Source: na.elf, 6237.1.00007ffe69a0c000.00007ffe69a2d000.rw-.sdmp Binary or memory string: x86_64/usr/bin/qemu-sparc/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, 6237.1.00007ffe69a0c000.00007ffe69a2d000.rw-.sdmp Binary or memory string: /usr/bin/qemu-sparc

Stealing of Sensitive Information
barindex
Yara detected Mirai
Source: Yara match File source: na.elf, type: SAMPLE
Source: Yara match File source: 6237.1.00007f93cc011000.00007f93cc021000.r-x.sdmp, type: MEMORY
Source: Yara match File source: Process Memory Space: na.elf PID: 6237, type: MEMORYSTR
Yara detected Moobot
Source: Yara match File source: na.elf, type: SAMPLE
Source: Yara match File source: 6237.1.00007f93cc011000.00007f93cc021000.r-x.sdmp, type: MEMORY
Source: Yara match File source: Process Memory Space: na.elf PID: 6237, type: MEMORYSTR

Remote Access Functionality
barindex
Detected Mirai
Source: Traffic Suricata IDS: ET MALWARE ELF/MooBot Mirai DDoS Variant CnC Checkin M2 (Group String Len 2+)
Source: Traffic Suricata IDS: ET MALWARE ELF/MooBot Mirai DDoS Variant Server Response
Source: Traffic Suricata IDS: ET MALWARE ELF/MooBot Mirai DDoS Variant Server Response
Source: Traffic Suricata IDS: ET MALWARE ELF/MooBot Mirai DDoS Variant Server Response
Source: Traffic Suricata IDS: ET MALWARE ELF/MooBot Mirai DDoS Variant Server Response
Source: Traffic Suricata IDS: ET MALWARE ELF/MooBot Mirai DDoS Variant Server Response
Source: Traffic Suricata IDS: ET MALWARE ELF/MooBot Mirai DDoS Variant Server Response
Source: Traffic Suricata IDS: ET MALWARE ELF/MooBot Mirai DDoS Variant Server Response
Yara detected Mirai
Source: Yara match File source: na.elf, type: SAMPLE
Source: Yara match File source: 6237.1.00007f93cc011000.00007f93cc021000.r-x.sdmp, type: MEMORY
Source: Yara match File source: Process Memory Space: na.elf PID: 6237, type: MEMORYSTR
Yara detected Moobot
Source: Yara match File source: na.elf, type: SAMPLE
Source: Yara match File source: 6237.1.00007f93cc011000.00007f93cc021000.r-x.sdmp, type: MEMORY
Source: Yara match File source: Process Memory Space: na.elf PID: 6237, 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
181.41.196.16
 xz33006.h52l.com Chile
61317 ASDETUKhttpwwwheficedcomGB 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
xz33006.h52l.com 181.41.196.16 true