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Linux Analysis Report
eWOLEi2hJg.elf

Overview

General Information

Sample name:	eWOLEi2hJg.elf renamed because original name is a hash value
Original sample name:	d75994684d5bc04028dca45e93e58f716e06f69f173cf4ab47f9c68d5436a247.elf
Analysis ID:	1520719
MD5:	428a5618b90e0d98b96205ce2b40bf14
SHA1:	a14953444955b6049d402bb5445d25a9ea794c9a
SHA256:	d75994684d5bc04028dca45e93e58f716e06f69f173cf4ab47f9c68d5436a247
Tags:	45-124-64-27elfuser-JAMESWT_MHT
Infos:

Detection

ConnectBack

Score:	72
Range:	0 - 100
Whitelisted:	false

Signatures

Found malware configuration

Multi AV Scanner detection for submitted file

Yara detected ConnectBack

Connects to many ports of the same IP (likely port scanning)

Machine Learning detection for sample

Detected TCP or UDP traffic on non-standard ports

Sample contains only a LOAD segment without any section mappings

Classification

General Information

Joe Sandbox version:	41.0.0 Charoite
Analysis ID:	1520719
Start date and time:	2024-09-27 19:12:09 +02:00
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:	eWOLEi2hJg.elf renamed because original name is a hash value
Original Sample Name:	d75994684d5bc04028dca45e93e58f716e06f69f173cf4ab47f9c68d5436a247.elf
Detection:	MAL
Classification:	mal72.troj.linELF@0/0@2/0

Warnings

VT rate limit hit for: eWOLEi2hJg.elf

Runtime Messages

Command:	/tmp/eWOLEi2hJg.elf
PID:	5435
Exit Code:	139
Exit Code Info:	SIGSEGV (11) Segmentation fault invalid memory reference
Killed:	False
Standard Output:
Standard Error:

Process Tree

system is lnxubuntu20

eWOLEi2hJg.elf (PID: 5435, Parent: 5357, MD5: 428a5618b90e0d98b96205ce2b40bf14) Arguments: /tmp/eWOLEi2hJg.elf

cleanup

Malware Threat Intel

Provided by

Name	Description	Attribution	Blogpost URLs	Link
ConnectBack	ConnectBack malware is a type of malicious software designed to establish unauthorized connections from an infected system to a remote server. Once a victim's device is compromised, ConnectBack creates a covert channel for communication, allowing the attacker to remotely control and gather sensitive information from the compromised system.	No Attribution	https://labs.sucuri.net/signatures/malwares/pl-backdoor-connectback-001/	https://malpedia.caad.fkie.fraunhofer.de/details/elf.connectback

Yara Signatures

Memory Dumps

Source	Rule	Description	Author	Strings
5435.1.0000000000400000.0000000000401000.rwx.sdmp	JoeSecurity_ConnectBack	Yara detected ConnectBack	Joe Security

Suricata Signatures

⊘No Suricata rule has matched

Joe Sandbox Signatures

Click to jump to signature section

Show All Signature Results

AV Detection

Found malware configuration

Source: 5435.1.0000000000400000.0000000000401000.rwx.sdmp

Malware Configuration Extractor: ConnectBack {"C2": "45.124.64.27:47159"}

Multi AV Scanner detection for submitted file

Source: eWOLEi2hJg.elf

ReversingLabs: Detection: 50%

Machine Learning detection for sample

Source: eWOLEi2hJg.elf

Joe Sandbox ML: detected

Networking

Connects to many ports of the same IP (likely port scanning)

Source: global traffic

TCP traffic: 45.124.64.27 ports 47159,1,4,5,7,9

Source: global traffic

TCP traffic: 192.168.2.13:53150 -> 45.124.64.27:47159

Source: unknown	TCP traffic detected without corresponding DNS query: 45.124.64.27
Source: unknown	TCP traffic detected without corresponding DNS query: 45.124.64.27
Source: unknown	TCP traffic detected without corresponding DNS query: 45.124.64.27
Source: unknown	TCP traffic detected without corresponding DNS query: 45.124.64.27
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: LOAD without section mappings

Program segment: 0x400000

Source: classification engine

Classification label: mal72.troj.linELF@0/0@2/0

Stealing of Sensitive Information

Yara detected ConnectBack

Source: Yara match

File source: 5435.1.0000000000400000.0000000000401000.rwx.sdmp, type: MEMORY

Remote Access Functionality

Yara detected ConnectBack

Source: Yara match

File source: 5435.1.0000000000400000.0000000000401000.rwx.sdmp, type: MEMORY

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	System Service Discovery	Remote Services	Data from Local System	1 Non-Standard Port	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 Non-Application Layer Protocol	Exfiltration Over Bluetooth	Network Denial of Service
Email Addresses	DNS Server	Domain Accounts	At	Logon Script (Windows)	Logon Script (Windows)	Obfuscated Files or Information	Security Account Manager	Query Registry	SMB/Windows Admin Shares	Data from Network Shared Drive	1 Application Layer Protocol	Automated Exfiltration	Data Encrypted for Impact

Malware Configuration

Threatname: ConnectBack

{"C2": "45.124.64.27:47159"}

Behavior Graph

Hide Legend

Legend:

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

Antivirus, Machine Learning and Genetic Malware Detection

Initial Sample

Source	Detection	Scanner	Label	Link
eWOLEi2hJg.elf	50%	ReversingLabs	Linux.Backdoor.Meterpreter
eWOLEi2hJg.elf	100%	Joe Sandbox ML

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. of IPs < 25%
25% < No. of IPs < 50%
50% < No. of IPs < 75%
75% < No. of IPs

Public IPs

IP	Domain	Country	Flag	ASN	ASN Name	Malicious
45.124.64.27	unknown	Hong Kong		36351	SOFTLAYERUS	true

Joe Sandbox View / Context

IPs

⊘No context

Domains

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link	Context
daisy.ubuntu.com	SecuriteInfo.com.ELF.FastReverseProxy-D.16458.15476.elf	Get hash	malicious	Unknown	Browse	162.213.35.25
	pl.spc.elf	Get hash	malicious	Gafgyt	Browse	162.213.35.25
	pl.x86.elf	Get hash	malicious	Gafgyt	Browse	162.213.35.24
	pl.arm5.elf	Get hash	malicious	Gafgyt	Browse	162.213.35.24
	pl.m68.elf	Get hash	malicious	Gafgyt	Browse	162.213.35.25
	pl.mips.elf	Get hash	malicious	Gafgyt	Browse	162.213.35.25
	pl.ppc.elf	Get hash	malicious	Gafgyt	Browse	162.213.35.25
	pl.sh4.elf	Get hash	malicious	Gafgyt	Browse	162.213.35.25
	pl.arm4t.elf	Get hash	malicious	Gafgyt	Browse	162.213.35.24
	i586.elf	Get hash	malicious	Unknown	Browse	162.213.35.24

ASNs

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link	Context
SOFTLAYERUS	https://uhcdenal.com/	Get hash	malicious	Unknown	Browse	52.116.53.155
	z65orderrequest.bat.exe	Get hash	malicious	GuLoader, Remcos	Browse	43.226.229.233
	SecuriteInfo.com.Linux.Siggen.9999.1529.24643.elf	Get hash	malicious	Unknown	Browse	169.63.50.112
	http://pub-d64d63bc9b0049929bfeb3afd89bfb4d.r2.dev/file.html	Get hash	malicious	HTMLPhisher	Browse	169.55.190.245
	Awb_Shipping_Documents_BL_Invoice_Packinglist_0000000000000000000000pdf.exe	Get hash	malicious	Remcos, GuLoader	Browse	172.111.137.137
	http://pub-d64d63bc9b0049929bfeb3afd89bfb4d.r2.dev/file.html	Get hash	malicious	HTMLPhisher	Browse	169.55.190.245
	SecuriteInfo.com.Linux.Siggen.9999.32167.12194.elf	Get hash	malicious	Unknown	Browse	70.87.118.83
	SecuriteInfo.com.Linux.Siggen.9999.11593.30273.elf	Get hash	malicious	Unknown	Browse	173.192.57.8
	http://17ebook.com	Get hash	malicious	Unknown	Browse	52.116.53.155
	https://bankllist.us	Get hash	malicious	Unknown	Browse	52.116.53.150

JA3 Fingerprints

⊘No context

Dropped Files

⊘No context

Created / dropped Files

⊘No created / dropped files found

Static File Info

General

File type:	ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, no section header
Entropy (8bit):	5.309859275769177
TrID:	ELF Executable and Linkable format (Linux) (4029/14) 50.16% ELF Executable and Linkable format (generic) (4004/1) 49.84%
File name:	eWOLEi2hJg.elf
File size:	295 bytes
MD5:	428a5618b90e0d98b96205ce2b40bf14
SHA1:	a14953444955b6049d402bb5445d25a9ea794c9a
SHA256:	d75994684d5bc04028dca45e93e58f716e06f69f173cf4ab47f9c68d5436a247
SHA512:	11faf46cc55e07b01a36b1f57bebf5d8eaa740a1f4d96df197672985d73aaea05c7f9cc9c110e785703dc4b986afc056bbd53382f960aad29aa2aa81e49c319a
SSDEEP:	6:BnX//In8/r1aklZRRzvO2+vVo1LvqeR552m1yKcyBHKRec:BvwncrQ6T6nVoBvvRn2m1Byec
TLSH:	95E0A747174713CFD2614D79C4D803312AF3D077F2615B2799A6251A380795D0C31964
File Content Preview:	.ELF..............>.....x.@.....@...................@.8...........................@.......@.....'.......................H1.H......H......H..a..L...H1X'H-................0.}A`..;......F...&.K..........`..I..y.Z.?.1..{V....[.J..... ..d...Hs.../.T.`.....I..^

Static ELF Info

ELF header
Class:	ELF64
Data:	2's complement, little endian
Version:	1 (current)
Machine:	Advanced Micro Devices X86-64
Version Number:	0x1
Type:	EXEC (Executable file)
OS/ABI:	UNIX - System V
ABI Version:	0
Entry Point Address:	0x400078
Flags:	0x0
ELF Header Size:	64
Program Header Offset:	64
Program Header Size:	56
Number of Program Headers:	1
Section Header Offset:	0
Section Header Size:	0
Number of Section Headers:	0
Header String Table Index:	0

Program Segments

Type	Offset	Virtual Address	Physical Address	File Size	Memory Size	Entropy	Flags	Flags Description	Align	Prog Interpreter	Section Mappings
LOAD	0x0	0x400000	0x400000	0x127	0x1d6	5.3099	0x7	RWE	0x1000

Network Behavior

Network Port Distribution

TCP Packets

Timestamp	Source Port	Dest Port	Source IP	Dest IP
Sep 27, 2024 19:12:54.682404995 CEST	53150	47159	192.168.2.13	45.124.64.27
Sep 27, 2024 19:12:54.687553883 CEST	47159	53150	45.124.64.27	192.168.2.13
Sep 27, 2024 19:12:54.687746048 CEST	53150	47159	192.168.2.13	45.124.64.27
Sep 27, 2024 19:12:56.706355095 CEST	47159	53150	45.124.64.27	192.168.2.13
Sep 27, 2024 19:12:56.708197117 CEST	53150	47159	192.168.2.13	45.124.64.27
Sep 27, 2024 19:12:56.924277067 CEST	53150	47159	192.168.2.13	45.124.64.27
Sep 27, 2024 19:12:56.929364920 CEST	47159	53150	45.124.64.27	192.168.2.13

UDP Packets

Timestamp	Source Port	Dest Port	Source IP	Dest IP
Sep 27, 2024 19:12:57.383703947 CEST	59588	53	192.168.2.13	1.1.1.1
Sep 27, 2024 19:12:57.383754969 CEST	54889	53	192.168.2.13	1.1.1.1
Sep 27, 2024 19:12:57.390851974 CEST	53	59588	1.1.1.1	192.168.2.13
Sep 27, 2024 19:12:57.390968084 CEST	53	54889	1.1.1.1	192.168.2.13

DNS Queries

Timestamp	Source IP	Dest IP	Trans ID	OP Code	Name	Type	Class	DNS over HTTPS
Sep 27, 2024 19:12:57.383703947 CEST	192.168.2.13	1.1.1.1	0x74c8	Standard query (0)	daisy.ubuntu.com	A (IP address)	IN (0x0001)	false
Sep 27, 2024 19:12:57.383754969 CEST	192.168.2.13	1.1.1.1	0x770b	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
Sep 27, 2024 19:12:57.390851974 CEST	1.1.1.1	192.168.2.13	0x74c8	No error (0)	daisy.ubuntu.com		162.213.35.24	A (IP address)	IN (0x0001)	false
Sep 27, 2024 19:12:57.390851974 CEST	1.1.1.1	192.168.2.13	0x74c8	No error (0)	daisy.ubuntu.com		162.213.35.25	A (IP address)	IN (0x0001)	false

System Behavior

Analysis Process: eWOLEi2hJg.elf PID: 5435, Parent PID: 5357

General

Start time (UTC):	17:12:53
Start date (UTC):	27/09/2024
Path:	/tmp/eWOLEi2hJg.elf
Arguments:	/tmp/eWOLEi2hJg.elf
File size:	295 bytes
MD5 hash:	428a5618b90e0d98b96205ce2b40bf14

Description:	Adversaries may communicate using a protocol and port pairing that are typically not associated. For example, HTTPS over port 8088or port 587as opposed to the traditional port 443. Adversaries may make changes to the standard port used by a protocol to bypass filtering or muddle analysis/parsing of network data.
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

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 eWOLEi2hJg.elf

Overview

General Information

Detection

Signatures

Classification

General Information

Warnings

Runtime Messages

Process Tree

Malware Threat Intel

Yara Signatures

Memory Dumps

Suricata Signatures

Joe Sandbox Signatures

AV Detection

Networking

System Summary

Stealing of Sensitive Information

Remote Access Functionality

Mitre Att&ck Matrix

Malware Configuration

Threatname: ConnectBack

Behavior Graph

Antivirus, Machine Learning and Genetic Malware Detection

Initial Sample

Dropped Files

Domains

URLs

Domains and IPs

Contacted Domains

World Map of Contacted IPs

Public IPs

Joe Sandbox View / Context

IPs

Domains

ASNs

JA3 Fingerprints

Dropped Files

Created / dropped Files

Static File Info

General

Static ELF Info

ELF header

Program Segments

Network Behavior

Network Port Distribution

TCP Packets

UDP Packets

DNS Queries

DNS Answers

System Behavior

Analysis Process: eWOLEi2hJg.elf PID: 5435, Parent PID: 5357

General

Chronological Activities

Linux Analysis Report
eWOLEi2hJg.elf