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Linux Analysis Report
tftp.elf

Overview

General Information

Sample name:	tftp.elf
Analysis ID:	1544889
MD5:	14caf90fd128da7915ce8d84cf08f4c2
SHA1:	721a17f5450230441ebb58c1028de42902205221
SHA256:	e79f1eb1023d3e1cc81652e83f4efe56daa837c701214b8db655a4c69c8d9416
Tags:	elfuser-abuse_ch
Infos:

Detection

Score:	1
Range:	0 - 100
Whitelisted:	false

Signatures

Sample contains strings indicative of BusyBox which embeds multiple Unix commands in a single executable

Uses the "uname" system call to query kernel version information (possible evasion)

Classification

General Information

Joe Sandbox version:	41.0.0 Charoite
Analysis ID:	1544889
Start date and time:	2024-10-29 21:03:19 +01:00
Joe Sandbox product:	CloudBasic
Overall analysis duration:	0h 4m 20s
Hypervisor based Inspection enabled:	false
Report type:	full
Cookbook file name:	defaultlinuxfilecookbook.jbs
Analysis system description:	Ubuntu Linux 20.04 x64 (Kernel 5.4.0-72, Firefox 91.0, Evince Document Viewer 3.36.10, LibreOffice 6.4.7.2, OpenJDK 11.0.11)
Analysis Mode:	default
Sample name:	tftp.elf
Detection:	CLEAN
Classification:	clean1.linELF@0/0@2/0

Warnings

VT rate limit hit for: tftp.elf

Runtime Messages

Command:	/tmp/tftp.elf
PID:	5536
Exit Code:	135
Exit Code Info:
Killed:	False
Standard Output:
Standard Error:

Process Tree

system is lnxubuntu20

tftp.elf (PID: 5536, Parent: 5454, MD5: 0083f1f0e77be34ad27f849842bbb00c) Arguments: /tmp/tftp.elf

cleanup

Yara Signatures

⊘No yara matches

Suricata Signatures

⊘No Suricata rule has matched

Joe Sandbox Signatures

Click to jump to signature section

Show All Signature Results

There are no malicious signatures, click here to show all signatures.

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: global traffic

DNS traffic detected: DNS query: daisy.ubuntu.com

Source: Initial sample	String containing 'busybox' found: busybox_main
Source: Initial sample	String containing 'busybox' found: _fini__uClibc_mainbb_applet_namerun_applet_by_namebb_error_msg_and_diebeen_there_done_thatstderrbb_msg_full_versionappletsfputsbb_strlenmemmovememsetusage_messagesstrcmpbsearchfind_applet_by_namebb_show_usagebusybox_maintest_maincat_mainchmod_mainchown_mainclear_maincp_maindate_maindf_maindu_mainecho_mainenv_mainfalse_mainhalt_mainhostname_mainifconfig_maininit_maininsmod_mainkill_mainln_mainls_mainlsmod_mainmesg_mainmkdir_mainmknod_mainmodprobe_mainmore_mainmsh_mainmv_mainnetstat_mainnslookup_mainping_mainpoweroff_mainps_mainpwd_mainreboot_mainreset_mainrm_mainrmdir_mainrmmod_mainstart_stop_daemon_mainstty_maintail_maintelnet_maintftp_maintop_maintouch_maintrue_mainumount_mainuname_mainuptime_mainwhoami_mainbb_getopt_ulflagsoptindbb_wfopen_inputfilenobb_copyfd_eofbb_fclose_nonstdinbb_parse_modechmodbb_perror_msgrecursive_actionlchownstrchrget_ug_idmy_getgrnammy_getpwnamlstatcp_mv_stat2cp_mv_statbb_get_last_path_componentconcat_path_filecopy_filefreebb_opt_complementalyputenvbb_perror_msg_and_dielocaltimememc

Source: classification engine

Classification label: clean1.linELF@0/0@2/0

Source: /tmp/tftp.elf (PID: 5536)

Queries kernel information via 'uname':

Jump to behavior

Source: tftp.elf, 5536.1.00007fff1aa9c000.00007fff1aabd000.rw-.sdmp	Binary or memory string: 5x86_64/usr/bin/qemu-mips/tmp/tftp.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/tftp.elf
Source: tftp.elf, 5536.1.0000559f9a10c000.0000559f9a170000.rw-.sdmp	Binary or memory string: U!/etc/qemu-binfmt/mips
Source: tftp.elf, 5536.1.0000559f9a10c000.0000559f9a170000.rw-.sdmp	Binary or memory string: /etc/qemu-binfmt/mips
Source: tftp.elf, 5536.1.00007fff1aa9c000.00007fff1aabd000.rw-.sdmp	Binary or memory string: /usr/bin/qemu-mips

Mitre Att&ck Matrix

Reconnaissance	Resource Development	Initial Access	Execution	Persistence	Privilege Escalation	Defense Evasion	Credential Access	Discovery	Lateral Movement	Collection	Command and Control	Exfiltration	Impact
Gather Victim Identity Information	Acquire Infrastructure	Valid Accounts	Windows Management Instrumentation	Path Interception	Path Interception	Direct Volume Access	OS Credential Dumping	11 Security Software Discovery	Remote Services	Data from Local System	1 Non-Application Layer Protocol	Exfiltration Over Other Network Medium	Abuse Accessibility Features
Credentials	Domains	Default Accounts	Scheduled Task/Job	Boot or Logon Initialization Scripts	Boot or Logon Initialization Scripts	Rootkit	LSASS Memory	Application Window Discovery	Remote Desktop Protocol	Data from Removable Media	1 Application Layer Protocol	Exfiltration Over Bluetooth	Network Denial of Service

Malware Configuration

⊘No configs have been found

Behavior Graph

Hide Legend

Legend:

Process
Signature
Created File
DNS/IP Info
Is Dropped
Number of created Files
Is malicious
Internet

Screenshots

Thumbnails

This section contains all screenshots as thumbnails, including those not shown in the slideshow.

Antivirus, Machine Learning and Genetic Malware Detection

Initial Sample

Source	Detection	Scanner	Label	Link
tftp.elf	0%	ReversingLabs

Dropped Files

⊘No Antivirus matches

Domains

⊘No Antivirus matches

URLs

⊘No Antivirus matches

Domains and IPs

Contacted Domains

Name	IP	Active	Malicious	Antivirus Detection	Reputation
daisy.ubuntu.com	162.213.35.24	true	false		unknown

World Map of Contacted IPs

⊘No contacted IP infos

Joe Sandbox View / Context

IPs

⊘No context

Domains

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link	Context
daisy.ubuntu.com	belks.arm.elf	Get hash	malicious	Mirai	Browse	162.213.35.24
	belks.arm6.elf	Get hash	malicious	Mirai	Browse	162.213.35.25
	belks.arm5.elf	Get hash	malicious	Unknown	Browse	162.213.35.24
	belks.arm7.elf	Get hash	malicious	Mirai	Browse	162.213.35.25
	belks.mips.elf	Get hash	malicious	Mirai	Browse	162.213.35.24
	belks.sh4.elf	Get hash	malicious	Mirai	Browse	162.213.35.24
	belks.ppc.elf	Get hash	malicious	Mirai	Browse	162.213.35.25
	5.elf	Get hash	malicious	Unknown	Browse	162.213.35.24
	arm6.elf	Get hash	malicious	Mirai	Browse	162.213.35.25
	arm7.elf	Get hash	malicious	Mirai	Browse	162.213.35.24

ASNs

⊘No context

JA3 Fingerprints

⊘No context

Dropped Files

⊘No context

Created / dropped Files

⊘No created / dropped files found

Static File Info

General

File type:	ELF 32-bit MSB executable, MIPS, MIPS32 version 1 (SYSV), dynamically linked, interpreter /lib/ld-uClibc.so.0, missing section headers at 243968
Entropy (8bit):	5.355308200844317
TrID:	ELF Executable and Linkable format (generic) (4004/1) 100.00%
File name:	tftp.elf
File size:	102'400 bytes
MD5:	14caf90fd128da7915ce8d84cf08f4c2
SHA1:	721a17f5450230441ebb58c1028de42902205221
SHA256:	e79f1eb1023d3e1cc81652e83f4efe56daa837c701214b8db655a4c69c8d9416
SHA512:	adfa59151549ae073e7938c73762740d337811f7acca26089f3da9f77aa25fbff745ac779bc6faf746d69b7ef428dd536a2ae28f618a1eb593093dbc3e477815
SSDEEP:	1536:fmdurU07J8MtqHxqGPkncW/RVi/wJz8H6xVRFOr4kp6khxH:fma7JLqHxcncWZViTH6xVRFOR6khV
TLSH:	DCA3825E7A218F7DF6B8C73497FB1B34A77922CA2A91C580D1ACD5012E2434D981FF68
File Content Preview:	.ELF.....................@7....4....P....4. ...(...........4.@.4.@.4.........................@...@..................p......(.@.(.@.(.........................@...@....a...a...............a..Da..Da.......N0...............@.@.@.@.@...........................

Network Behavior

Network Port Distribution

UDP Packets

Timestamp	Source Port	Dest Port	Source IP	Dest IP
Oct 29, 2024 21:04:05.682923079 CET	33744	53	192.168.2.15	1.1.1.1
Oct 29, 2024 21:04:05.682971954 CET	48836	53	192.168.2.15	1.1.1.1
Oct 29, 2024 21:04:05.691139936 CET	53	48836	1.1.1.1	192.168.2.15
Oct 29, 2024 21:04:05.706795931 CET	53	33744	1.1.1.1	192.168.2.15

DNS Queries

Timestamp	Source IP	Dest IP	Trans ID	OP Code	Name	Type	Class	DNS over HTTPS
Oct 29, 2024 21:04:05.682923079 CET	192.168.2.15	1.1.1.1	0x5979	Standard query (0)	daisy.ubuntu.com	A (IP address)	IN (0x0001)	false
Oct 29, 2024 21:04:05.682971954 CET	192.168.2.15	1.1.1.1	0xe47f	Standard query (0)	daisy.ubuntu.com	28	IN (0x0001)	false

DNS Answers

Timestamp	Source IP	Dest IP	Trans ID	Reply Code	Name	CName	Address	Type	Class	DNS over HTTPS
Oct 29, 2024 21:04:05.706795931 CET	1.1.1.1	192.168.2.15	0x5979	No error (0)	daisy.ubuntu.com		162.213.35.24	A (IP address)	IN (0x0001)	false
Oct 29, 2024 21:04:05.706795931 CET	1.1.1.1	192.168.2.15	0x5979	No error (0)	daisy.ubuntu.com		162.213.35.25	A (IP address)	IN (0x0001)	false

System Behavior

Analysis Process: tftp.elf PID: 5536, Parent PID: 5454

General

Start time (UTC):	20:04:03
Start date (UTC):	29/10/2024
Path:	/tmp/tftp.elf
Arguments:	/tmp/tftp.elf
File size:	5777432 bytes
MD5 hash:	0083f1f0e77be34ad27f849842bbb00c

Description:	Adversaries may attempt to get a listing of security software, configurations, defensive tools, and sensors that are installed on a system or in a cloud environment. This may include things such as firewall rules and anti-virus. Adversaries may use the information from Security Software Discovery during automated discovery to shape follow-on behaviors, including whether or not the adversary fully infects the target and/or attempts specific actions.
Tactics:	Discovery
Data Sources:	Command: Command Execution, Firewall: Firewall Enumeration, Firewall: Firewall Metadata, Process: OS API Execution, Process: Process Creation
Platforms:	Azure AD, Google Workspace, IaaS, Linux, macOS, Office 365, SaaS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may use an OSI non-application layer protocol for communication between host and C2 server or among infected hosts within a network. The list of possible protocols is extensive.Specific examples include use of network layer protocols, such as the Internet Control Message Protocol (ICMP), transport layer protocols, such as the User Datagram Protocol (UDP), session layer protocols, such as Socket Secure (SOCKS), as well as redirected/tunneled protocols, such as Serial over LAN (SOL).
Tactics:	Command and Control
Data Sources:	Network Traffic: Network Traffic Content, Network Traffic: Network Traffic Flow
Platforms:	Linux, macOS, Network, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may communicate using OSI application layer protocols to avoid detection/network filtering by blending in with existing traffic. Commands to the remote system, and often the results of those commands, will be embedded within the protocol traffic between the client and server.
Tactics:	Command and Control
Data Sources:	Network Traffic: Network Traffic Content, Network Traffic: Network Traffic Flow
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Behavior Section

Behavior Chronological

Disassembly

Uncategorized

Graph

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Linux Analysis Report tftp.elf

Overview

General Information

Detection

Signatures

Classification

General Information

Warnings

Runtime Messages

Process Tree

Yara Signatures

Suricata Signatures

Joe Sandbox Signatures

Networking

System Summary

Malware Analysis System Evasion

Mitre Att&ck Matrix

Malware Configuration

Behavior Graph

Screenshots

Thumbnails

Antivirus, Machine Learning and Genetic Malware Detection

Initial Sample

Dropped Files

Domains

URLs

Domains and IPs

Contacted Domains

World Map of Contacted IPs

Joe Sandbox View / Context

IPs

Domains

ASNs

JA3 Fingerprints

Dropped Files

Created / dropped Files

Static File Info

General

Network Behavior

Network Port Distribution

UDP Packets

DNS Queries

DNS Answers

System Behavior

Analysis Process: tftp.elf PID: 5536, Parent PID: 5454

General

Chronological Activities

Linux Analysis Report
tftp.elf