Linux Analysis Report
na.elf

Overview

General Information

Sample name: na.elf
Analysis ID: 1530552
MD5: 784a35815074f518c0ca7f5f46ea636c
SHA1: 5aa11310e97ce24ba7e5388823f12069ed17013b
SHA256: 120d534136359bc888e60905e4139f671f9f55fed8ed643cfe4793d77b3d18c0
Tags: elfMiraiuser-abuse_ch
Infos:

Detection

Score: 64
Range: 0 - 100
Whitelisted: false

Signatures

Antivirus / Scanner detection for submitted sample
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for submitted file
ELF contains segments with high entropy indicating compressed/encrypted content
Sample contains only a LOAD segment without any section mappings
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

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: 52%
Tries to connect to HTTP servers, but all servers are down (expired dropper behavior)
Source: global traffic TCP traffic: 192.168.2.14:46540 -> 185.125.190.26:443
Source: unknown TCP traffic detected without corresponding DNS query: 185.125.190.26
Source: unknown TCP traffic detected without corresponding DNS query: 185.125.190.26
Source: global traffic DNS traffic detected: DNS query: daisy.ubuntu.com
Source: unknown Network traffic detected: HTTP traffic on port 46540 -> 443

System Summary
barindex
Malicious sample detected (through community Yara rule)
Source: na.elf, type: SAMPLE Matched rule: Linux_Packer_Patched_UPX_62e11c64 Author: unknown
Source: 5513.1.00007f5d48400000.00007f5d48422000.r-x.sdmp, type: MEMORY Matched rule: Linux_Packer_Patched_UPX_62e11c64 Author: unknown
Sample contains only a LOAD segment without any section mappings
Source: LOAD without section mappings Program segment: 0x400000
Yara signature match
Source: na.elf, type: SAMPLE Matched rule: Linux_Packer_Patched_UPX_62e11c64 reference_sample = 02f81a1e1edcb9032a1d7256a002b11e1e864b2e9989f5d24ea1c9b507895669, os = linux, severity = x86, creation_date = 2021-06-08, scan_context = file, reference = https://cujo.com/upx-anti-unpacking-techniques-in-iot-malware/, license = Elastic License v2, threat_name = Linux.Packer.Patched_UPX, fingerprint = 3297b5c63e70c557e71b739428b453039b142e1e04c2ab15eea4627d023b686d, id = 62e11c64-fc7d-4a0a-9d72-ad53ec3987ff, last_modified = 2021-07-28
Source: 5513.1.00007f5d48400000.00007f5d48422000.r-x.sdmp, type: MEMORY Matched rule: Linux_Packer_Patched_UPX_62e11c64 reference_sample = 02f81a1e1edcb9032a1d7256a002b11e1e864b2e9989f5d24ea1c9b507895669, os = linux, severity = x86, creation_date = 2021-06-08, scan_context = file, reference = https://cujo.com/upx-anti-unpacking-techniques-in-iot-malware/, license = Elastic License v2, threat_name = Linux.Packer.Patched_UPX, fingerprint = 3297b5c63e70c557e71b739428b453039b142e1e04c2ab15eea4627d023b686d, id = 62e11c64-fc7d-4a0a-9d72-ad53ec3987ff, last_modified = 2021-07-28
Source: classification engine Classification label: mal64.linELF@0/0@2/0
ELF contains segments with high entropy indicating compressed/encrypted content
Source: na.elf Submission file: segment LOAD with 7.781 entropy (max. 8.0)
Uses the "uname" system call to query kernel version information (possible evasion)
Source: /tmp/na.elf (PID: 5513) Queries kernel information via 'uname': Jump to behavior
Source: na.elf, 5513.1.0000561a43bba000.0000561a43c41000.rw-.sdmp Binary or memory string: /etc/qemu-binfmt/mipsel
Source: na.elf, 5513.1.0000561a43bba000.0000561a43c41000.rw-.sdmp Binary or memory string: V!/etc/qemu-binfmt/mipsel
Source: na.elf, 5513.1.00007ffdab828000.00007ffdab849000.rw-.sdmp Binary or memory string: qemu: uncaught target signal 11 (Segmentation fault) - core dumped
Source: na.elf, 5513.1.00007ffdab828000.00007ffdab849000.rw-.sdmp Binary or memory string: /usr/bin/qemu-mipsel
Source: na.elf, 5513.1.00007ffdab828000.00007ffdab849000.rw-.sdmp Binary or memory string: x86_64/usr/bin/qemu-mipsel/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

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
185.125.190.26
 unknown United Kingdom
41231 CANONICAL-ASGB false

Contacted Domains

Name IP Active
daisy.ubuntu.com 162.213.35.24 true