Linux Analysis Report
Kt28gy4sgm.elf

Overview

General Information

Sample name: Kt28gy4sgm.elf
renamed because original name is a hash value
Original sample name: bc86183c67db69ea5c83b7a596a6cc21.elf
Analysis ID: 1428299
MD5: bc86183c67db69ea5c83b7a596a6cc21
SHA1: 74fcd1752f465bc553b55cc66500529ce9039dd1
SHA256: 57387202c335220f7e19bbb08758a735d3307ae45e3fbe6ee1e1bffe9e3da53d
Tags: 32armelfmirai
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
Contains symbols with names commonly found in malware
Sample deletes itself
Detected TCP or UDP traffic on non-standard ports
Enumerates processes within the "proc" file system
Executes the "rm" command used to delete files or directories
Found strings indicative of a multi-platform dropper
Sample and/or dropped files contains symbols with suspicious names
Sample listens on a socket
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
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Antivirus / Scanner detection for submitted sample
Source: Kt28gy4sgm.elf Avira: detected
Multi AV Scanner detection for submitted file
Source: Kt28gy4sgm.elf ReversingLabs: Detection: 55%
Found strings indicative of a multi-platform dropper
Source: Kt28gy4sgm.elf String: /proc//exe%s/%s/proc/%s/cmdlinewgetcurlnetstatgreppslsmvechokillbashrebootshutdownhaltpowerofffaggot got malware'd/tmp/opt/home/dev/var/sbin/proc/self/exe//mnt/root/dev/null/dev/console/dev/watchdog/dev/misc/watchdog
Detected TCP or UDP traffic on non-standard ports
Source: global traffic TCP traffic: 192.168.2.23:60512 -> 104.168.45.11:7722
Sample listens on a socket
Source: /tmp/Kt28gy4sgm.elf (PID: 6225) Socket: 127.0.0.1::39123 Jump to behavior
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: 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: 91.189.91.42
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: 91.189.91.43
Source: unknown UDP traffic detected without corresponding DNS query: 1.1.1.1
Source: unknown UDP traffic detected without corresponding DNS query: 1.1.1.1
Source: unknown UDP traffic detected without corresponding DNS query: 1.1.1.1
Source: unknown UDP traffic detected without corresponding DNS query: 1.1.1.1
Source: unknown UDP traffic detected without corresponding DNS query: 1.1.1.1
Source: unknown UDP traffic detected without corresponding DNS query: 1.1.1.1
Source: unknown DNS traffic detected: queries for: tcpdown.su
Source: unknown Network traffic detected: HTTP traffic on port 43928 -> 443
Source: unknown Network traffic detected: HTTP traffic on port 39248 -> 443
Source: unknown Network traffic detected: HTTP traffic on port 443 -> 39248
Source: unknown Network traffic detected: HTTP traffic on port 42836 -> 443

System Summary
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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.c
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_method_udprape
Source: ELF static info symbol of initial sample Name: attack_ongoing
Sample and/or dropped files contains symbols with suspicious names
Source: Kt28gy4sgm.elf ELF static info symbol of initial sample: __gnu_unwind_execute
Source: classification engine Classification label: mal72.troj.evad.linELF@0/0@6/0
Enumerates processes within the "proc" file system
Source: /tmp/Kt28gy4sgm.elf (PID: 6231) File opened: /proc/11/cmdline Jump to behavior
Source: /tmp/Kt28gy4sgm.elf (PID: 6231) File opened: /proc/22/cmdline Jump to behavior
Source: /tmp/Kt28gy4sgm.elf (PID: 6231) File opened: /proc/33/cmdline Jump to behavior
Source: /tmp/Kt28gy4sgm.elf (PID: 6231) File opened: /proc/66/cmdline Jump to behavior
Source: /tmp/Kt28gy4sgm.elf (PID: 6231) File opened: /proc/111/cmdline Jump to behavior
Source: /tmp/Kt28gy4sgm.elf (PID: 6231) File opened: /proc/222/cmdline Jump to behavior
Source: /tmp/Kt28gy4sgm.elf (PID: 6231) File opened: /proc/333/cmdline Jump to behavior
Source: /tmp/Kt28gy4sgm.elf (PID: 6231) File opened: /proc/777/cmdline Jump to behavior
Source: /tmp/Kt28gy4sgm.elf (PID: 6231) File opened: /proc/888/cmdline Jump to behavior
Source: /tmp/Kt28gy4sgm.elf (PID: 6231) File opened: /proc/999/cmdline Jump to behavior
Executes the "rm" command used to delete files or directories
Source: /usr/bin/dash (PID: 6294) Rm executable: /usr/bin/rm -> rm -f /tmp/tmp.0Yye5q8mNq /tmp/tmp.dgNBUU65IJ /tmp/tmp.swPyngJifa Jump to behavior
Source: /usr/bin/dash (PID: 6295) Rm executable: /usr/bin/rm -> rm -f /tmp/tmp.0Yye5q8mNq /tmp/tmp.dgNBUU65IJ /tmp/tmp.swPyngJifa Jump to behavior

Hooking and other Techniques for Hiding and Protection
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Sample deletes itself
Source: /tmp/Kt28gy4sgm.elf (PID: 6225) File: /tmp/Kt28gy4sgm.elf Jump to behavior
Uses the "uname" system call to query kernel version information (possible evasion)
Source: /tmp/Kt28gy4sgm.elf (PID: 6225) Queries kernel information via 'uname': Jump to behavior
Source: Kt28gy4sgm.elf, 6264.1.0000559b620b3000.0000559b620d5000.rw-.sdmp Binary or memory string: vmware
Source: Kt28gy4sgm.elf, 6225.1.0000559b61f85000.0000559b620d4000.rw-.sdmp, Kt28gy4sgm.elf, 6264.1.0000559b61f85000.0000559b620b3000.rw-.sdmp Binary or memory string: U!/etc/qemu-binfmt/arm
Source: Kt28gy4sgm.elf, 6264.1.0000559b620b3000.0000559b620d5000.rw-.sdmp Binary or memory string: $0vmware
Source: Kt28gy4sgm.elf, 6225.1.0000559b61f85000.0000559b620d4000.rw-.sdmp, Kt28gy4sgm.elf, 6264.1.0000559b61f85000.0000559b620b3000.rw-.sdmp Binary or memory string: /etc/qemu-binfmt/arm
Source: Kt28gy4sgm.elf, 6225.1.00007ffdef016000.00007ffdef037000.rw-.sdmp, Kt28gy4sgm.elf, 6264.1.00007ffdef016000.00007ffdef037000.rw-.sdmp Binary or memory string: /usr/bin/qemu-arm
Source: Kt28gy4sgm.elf, 6225.1.00007ffdef016000.00007ffdef037000.rw-.sdmp, Kt28gy4sgm.elf, 6264.1.00007ffdef016000.00007ffdef037000.rw-.sdmp Binary or memory string: x86_64/usr/bin/qemu-arm/tmp/Kt28gy4sgm.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/Kt28gy4sgm.elf

Stealing of Sensitive Information
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Yara detected Mirai
Source: Yara match File source: Kt28gy4sgm.elf, type: SAMPLE

Remote Access Functionality
barindex
Yara detected Mirai
Source: Yara match File source: Kt28gy4sgm.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
34.249.145.219
 unknown United States
16509 AMAZON-02US false
172.245.119.63
 unknown United States
36352 AS-COLOCROSSINGUS false
109.202.202.202
 unknown Switzerland
13030 INIT7CH false
104.168.45.11
 tcpdown.su United States
36352 AS-COLOCROSSINGUS 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
tcpdown.su 104.168.45.11 true
tcpdown.su( unknown unknown