Linux Analysis Report
arm5.elf

Overview

General Information

Sample name: arm5.elf
Analysis ID: 1544030
MD5: 88d126d1872e16f2ea2b1db201f92708
SHA1: a5da4e545f902699d6b821b33487fa5084293ffc
SHA256: d14efe9fa0ec6fdfebff98a4fbe2eec7a476806c9392a2f284b8ef726cc9f6e7
Tags: elfuser-abuse_ch
Infos:

Detection

Score: 56
Range: 0 - 100
Whitelisted: false

Signatures

Multi AV Scanner detection for submitted file
Deletes system log files
Sample tries to access files in /etc/config/ (typical for OpenWRT routers)
Creates hidden files and/or directories
Enumerates processes within the "proc" file system
Found strings indicative of a multi-platform dropper
Sample has stripped symbol table
Sample listens on a socket
Sample tries to kill a process (SIGKILL)
Sleeps for long times indicative of sandbox evasion
Uses the "uname" system call to query kernel version information (possible evasion)

Classification

AV Detection
barindex
Multi AV Scanner detection for submitted file
Source: arm5.elf ReversingLabs: Detection: 13%
Found strings indicative of a multi-platform dropper
Source: arm5.elf String: ash|login|wget|curl|tftp|ntpdate|ftp
Source: arm5.elf String: /proc//exe|ash|login|wget|curl|tftp|ntpdate|ftp/lib//lib64/
Sample listens on a socket
Source: /tmp/arm5.elf (PID: 6240) Socket: 127.0.0.1:1234 Jump to behavior
Sample has stripped symbol table
Source: ELF static info symbol of initial sample .symtab present: no
Sample tries to kill a process (SIGKILL)
Source: /tmp/arm5.elf (PID: 6242) SIGKILL sent: pid: 936, result: successful Jump to behavior
Source: /tmp/arm5.elf (PID: 6335) SIGKILL sent: pid: 6333, result: successful Jump to behavior
Source: /tmp/arm5.elf (PID: 6369) SIGKILL sent: pid: 6367, result: successful Jump to behavior
Source: /tmp/arm5.elf (PID: 6403) SIGKILL sent: pid: 6401, result: successful Jump to behavior
Source: classification engine Classification label: mal56.evad.linELF@0/0@0/0

Data Obfuscation
barindex
Sample tries to access files in /etc/config/ (typical for OpenWRT routers)
Source: /tmp/arm5.elf (PID: 6243) File: /etc/config Jump to behavior
Creates hidden files and/or directories
Source: /tmp/arm5.elf (PID: 6243) Directory: /root/.cache Jump to behavior
Source: /tmp/arm5.elf (PID: 6243) Directory: /root/.ssh Jump to behavior
Source: /tmp/arm5.elf (PID: 6243) Directory: /root/.config Jump to behavior
Source: /tmp/arm5.elf (PID: 6243) Directory: /root/.local Jump to behavior
Source: /tmp/arm5.elf (PID: 6243) Directory: /tmp/.X11-unix Jump to behavior
Source: /tmp/arm5.elf (PID: 6243) Directory: /tmp/.Test-unix Jump to behavior
Source: /tmp/arm5.elf (PID: 6243) Directory: /tmp/.font-unix Jump to behavior
Source: /tmp/arm5.elf (PID: 6243) Directory: /tmp/.ICE-unix Jump to behavior
Source: /tmp/arm5.elf (PID: 6243) Directory: /tmp/.XIM-unix Jump to behavior
Source: /tmp/arm5.elf (PID: 6243) Directory: /etc/.java Jump to behavior
Enumerates processes within the "proc" file system
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/230/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/110/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/231/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/111/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/232/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/112/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/233/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/113/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/234/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/114/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/235/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/115/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/236/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/116/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/237/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/117/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/118/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/910/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/119/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/912/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/10/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/11/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/918/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/12/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/13/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/14/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/15/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/16/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/17/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/18/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/120/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/121/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/1/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/122/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/243/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/123/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/2/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/124/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/3/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/4/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/125/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/126/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/127/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/6/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/248/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/128/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/249/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/800/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/9/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/801/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/20/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/21/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/22/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/23/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/24/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/25/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/26/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/27/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/28/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/29/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/491/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/250/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/130/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/251/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/252/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/132/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/253/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/254/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/255/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/256/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/257/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/379/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/258/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/259/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/936/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/30/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/35/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/260/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/261/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/141/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/262/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/263/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/264/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/144/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/265/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/266/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/267/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/269/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/270/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/272/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/274/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/278/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/157/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/281/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/286/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/720/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/721/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/847/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/77/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/78/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/79/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/80/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/81/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/82/fd Jump to behavior
Source: /tmp/arm5.elf (PID: 6242) File opened: /proc/83/fd Jump to behavior

Hooking and other Techniques for Hiding and Protection
barindex
Deletes system log files
Source: /tmp/arm5.elf (PID: 6243) Log files deleted: /var/log/kern.log Jump to behavior
Sleeps for long times indicative of sandbox evasion
Source: /tmp/arm5.elf (PID: 6335) Sleeps longer then 60s: 60.0s Jump to behavior
Source: /tmp/arm5.elf (PID: 6369) Sleeps longer then 60s: 60.0s Jump to behavior
Source: /tmp/arm5.elf (PID: 6403) Sleeps longer then 60s: 60.0s Jump to behavior
Source: /tmp/arm5.elf (PID: 6442) Sleeps longer then 60s: 60.0s Jump to behavior
Uses the "uname" system call to query kernel version information (possible evasion)
Source: /tmp/arm5.elf (PID: 6240) Queries kernel information via 'uname': Jump to behavior
Source: arm5.elf, 6240.1.00007ffe23f25000.00007ffe23f46000.rw-.sdmp, arm5.elf, 6333.1.00007ffe23f25000.00007ffe23f46000.rw-.sdmp, arm5.elf, 6335.1.00007ffe23f25000.00007ffe23f46000.rw-.sdmp, arm5.elf, 6367.1.00007ffe23f25000.00007ffe23f46000.rw-.sdmp, arm5.elf, 6369.1.00007ffe23f25000.00007ffe23f46000.rw-.sdmp, arm5.elf, 6401.1.00007ffe23f25000.00007ffe23f46000.rw-.sdmp, arm5.elf, 6403.1.00007ffe23f25000.00007ffe23f46000.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, 6240.1.0000560dade1e000.0000560dadf6c000.rw-.sdmp, arm5.elf, 6333.1.0000560dade1e000.0000560dadf6c000.rw-.sdmp, arm5.elf, 6335.1.0000560dade1e000.0000560dadf6c000.rw-.sdmp, arm5.elf, 6367.1.0000560dade1e000.0000560dadf6c000.rw-.sdmp, arm5.elf, 6369.1.0000560dade1e000.0000560dadf6c000.rw-.sdmp, arm5.elf, 6401.1.0000560dade1e000.0000560dadf6c000.rw-.sdmp, arm5.elf, 6403.1.0000560dade1e000.0000560dadf6c000.rw-.sdmp Binary or memory string: /etc/qemu-binfmt/arm
Source: arm5.elf, 6240.1.0000560dade1e000.0000560dadf6c000.rw-.sdmp, arm5.elf, 6333.1.0000560dade1e000.0000560dadf6c000.rw-.sdmp, arm5.elf, 6335.1.0000560dade1e000.0000560dadf6c000.rw-.sdmp, arm5.elf, 6367.1.0000560dade1e000.0000560dadf6c000.rw-.sdmp, arm5.elf, 6369.1.0000560dade1e000.0000560dadf6c000.rw-.sdmp, arm5.elf, 6401.1.0000560dade1e000.0000560dadf6c000.rw-.sdmp, arm5.elf, 6403.1.0000560dade1e000.0000560dadf6c000.rw-.sdmp Binary or memory string: V!/etc/qemu-binfmt/arm
Source: arm5.elf, 6240.1.00007ffe23f25000.00007ffe23f46000.rw-.sdmp, arm5.elf, 6333.1.00007ffe23f25000.00007ffe23f46000.rw-.sdmp, arm5.elf, 6335.1.00007ffe23f25000.00007ffe23f46000.rw-.sdmp, arm5.elf, 6367.1.00007ffe23f25000.00007ffe23f46000.rw-.sdmp, arm5.elf, 6369.1.00007ffe23f25000.00007ffe23f46000.rw-.sdmp, arm5.elf, 6401.1.00007ffe23f25000.00007ffe23f46000.rw-.sdmp, arm5.elf, 6403.1.00007ffe23f25000.00007ffe23f46000.rw-.sdmp Binary or memory string: /usr/bin/qemu-arm

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