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Linux Analysis Report
r5sPBYZoeg.elf

Overview

General Information

Sample Name:	r5sPBYZoeg.elf
Original Sample Name:	4ed5c7939fdaa8ca9cfc6cd0dfe762bb68b58adb434f98c1a28aae53c3b96b00.elf
Analysis ID:	1303707
MD5:	cb42acc26fc460bf02b00f38ca4b430b
SHA1:	6ed3326e64cabf5cba4c04da4aafcc4e86b07754
SHA256:	4ed5c7939fdaa8ca9cfc6cd0dfe762bb68b58adb434f98c1a28aae53c3b96b00
Tags:	elf
Infos:

Detection

ConnectBack

Score:	72
Range:	0 - 100
Whitelisted:	false

Signatures

Yara detected ConnectBack

Antivirus / Scanner detection for submitted sample

Found malware configuration

Multi AV Scanner detection for submitted file

Sample contains only a LOAD segment without any section mappings

Classification

General Information

Joe Sandbox Version:	38.0.0 Beryl
Analysis ID:	1303707
Start date and time:	2023-09-05 18:27:50 +02:00
Joe Sandbox Product:	CloudBasic
Overall analysis duration:	0h 8m 39s
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 file name:	r5sPBYZoeg.elf
Original Sample Name:	4ed5c7939fdaa8ca9cfc6cd0dfe762bb68b58adb434f98c1a28aae53c3b96b00.elf
Detection:	MAL
Classification:	mal72.troj.linELF@0/0@2/0

Warnings

VT rate limit hit for: r5sPBYZoeg.elf

Runtime Messages

Command:	/tmp/r5sPBYZoeg.elf
PID:	5544
Exit Code:
Exit Code Info:
Killed:	True
Standard Output:
Standard Error:

Process Tree

system is lnxubuntu20

r5sPBYZoeg.elf (PID: 5544, Parent: 5444, MD5: cb42acc26fc460bf02b00f38ca4b430b) Arguments: /tmp/r5sPBYZoeg.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
5544.1.0000000000400000.0000000000401000.rwx.sdmp	JoeSecurity_ConnectBack	Yara detected ConnectBack	Joe Security

Snort Signatures

⊘No Snort rule has matched

Joe Sandbox Signatures

Click to jump to signature section

Show All Signature Results

AV Detection

Antivirus / Scanner detection for submitted sample

Source: r5sPBYZoeg.elf

Avira: detected

Found malware configuration

Source: 5544.1.0000000000400000.0000000000401000.rwx.sdmp

Malware Configuration Extractor: ConnectBack {"C2": "10.5.31.54:4445"}

Multi AV Scanner detection for submitted file

Source: r5sPBYZoeg.elf

ReversingLabs: Detection: 47%

Source: unknown

DNS traffic detected: queries for: daisy.ubuntu.com

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: 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: 5544.1.0000000000400000.0000000000401000.rwx.sdmp, type: MEMORY

Remote Access Functionality

Yara detected ConnectBack

Source: Yara match

File source: 5544.1.0000000000400000.0000000000401000.rwx.sdmp, type: MEMORY

Mitre Att&ck Matrix

Initial Access	Execution	Persistence	Privilege Escalation	Defense Evasion	Credential Access	Discovery	Lateral Movement	Collection	Exfiltration	Command and Control	Network Effects	Remote Service Effects	Impact
Valid Accounts	Windows Management Instrumentation	Path Interception	Path Interception	Direct Volume Access	OS Credential Dumping	System Service Discovery	Remote Services	Data from Local System	Exfiltration Over Other Network Medium	1 Non-Application Layer Protocol	Eavesdrop on Insecure Network Communication	Remotely Track Device Without Authorization	Modify System Partition
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	Exfiltration Over Bluetooth	1 Application Layer Protocol	Exploit SS7 to Redirect Phone Calls/SMS	Remotely Wipe Data Without Authorization	Device Lockout

Malware Configuration

Threatname: ConnectBack

{"C2": "10.5.31.54:4445"}

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
r5sPBYZoeg.elf	47%	ReversingLabs	Linux.Trojan.AgentSig
r5sPBYZoeg.elf	100%	Avira	LINUX/AgentSig.GV

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	185.125.188.136	true	false		high

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	5w1ZVkWZr0.elf	Get hash	malicious	ConnectBack	Browse	185.125.188.137
	uY8I5tsPyE.elf	Get hash	malicious	Unknown	Browse	185.125.188.136
	aTW6NBHzrR.elf	Get hash	malicious	Mirai	Browse	185.125.188.136
	S0wBQZF3m0.elf	Get hash	malicious	Mirai	Browse	185.125.188.136
	2UrIdiFYkk.elf	Get hash	malicious	Mirai	Browse	185.125.188.137
	kVJm6vAtbZ.elf	Get hash	malicious	Mirai	Browse	185.125.188.136
	jDSxdSv24i.elf	Get hash	malicious	Mirai	Browse	185.125.188.137
	sora.x86.elf	Get hash	malicious	Mirai	Browse	185.125.188.137
	sora.arm7.elf	Get hash	malicious	Mirai	Browse	185.125.188.136
	1YAUVrxaRE.elf	Get hash	malicious	Unknown	Browse	185.125.188.136
	VDLHJ2DiAp.elf	Get hash	malicious	Mirai	Browse	185.125.188.137
	oVj60bn37Z.elf	Get hash	malicious	Unknown	Browse	185.125.188.137
	k6u3UrfMBu.elf	Get hash	malicious	Unknown	Browse	185.125.188.136
	IJB2Ub1KkE.elf	Get hash	malicious	Mirai	Browse	185.125.188.137
	KLKoNDE2QG.elf	Get hash	malicious	Mirai	Browse	185.125.188.136
	YG6BL264MC.elf	Get hash	malicious	Unknown	Browse	185.125.188.136
	SecuriteInfo.com.Linux.Siggen.9999.22201.31614.elf	Get hash	malicious	Mirai	Browse	185.125.188.136
	SecuriteInfo.com.Linux.Siggen.9999.13852.30731.elf	Get hash	malicious	Mirai	Browse	185.125.188.137
	6dQ4EzBG7Z.elf	Get hash	malicious	Mirai	Browse	185.125.188.136
	0PNv3OHIDT.elf	Get hash	malicious	Mirai	Browse	185.125.188.136

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 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, no section header
Entropy (8bit):	5.464046134639987
TrID:	ELF Executable and Linkable format (Linux) (4029/14) 50.16% ELF Executable and Linkable format (generic) (4004/1) 49.84%
File name:	r5sPBYZoeg.elf
File size:	302 bytes
MD5:	cb42acc26fc460bf02b00f38ca4b430b
SHA1:	6ed3326e64cabf5cba4c04da4aafcc4e86b07754
SHA256:	4ed5c7939fdaa8ca9cfc6cd0dfe762bb68b58adb434f98c1a28aae53c3b96b00
SHA512:	11327aadb8e862e4c70c6e05e63b38f457afb50f6f81f836c7e5eda4dce8fa7dbd4f01b3c32cd46971f2606c84f8de642d427a511dd3611fb408e282fd07ba97
SSDEEP:	6:BnX//In8/r1/9ammVtbN/ssaSiAWmSfnXsF6NNV9t08q:BvwncrN9oHbN/NaSi1Vnu6NNVw8q
TLSH:	C0E0230B6B60E3C3D10C8E306344033C43D38037989103478F10ACC04C02244CD31E74
File Content Preview:	.ELF..............>.....x.@.....@...................@.8...........................@.......@.............................M1.I.)wc.:..RA....H..f%..H...L.P.I..O1\|..M..u.aF.}3...9?..w.Y8.69.=......FP...y.JO....Cv=.?...QL+.rh.R8*i.%.......`...&r:_...w`..c"..qq

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	0x12e	0x1e4	5.4640	0x7	RWE	0x1000

Network Behavior

Network Port Distribution

TCP Packets

Timestamp	Source Port	Dest Port	Source IP	Dest IP
Sep 5, 2023 18:28:39.309745073 CEST	43594	4445	192.168.2.15	10.5.31.54
Sep 5, 2023 18:28:40.337572098 CEST	43594	4445	192.168.2.15	10.5.31.54
Sep 5, 2023 18:28:42.353532076 CEST	43594	4445	192.168.2.15	10.5.31.54
Sep 5, 2023 18:28:46.577672958 CEST	43594	4445	192.168.2.15	10.5.31.54
Sep 5, 2023 18:28:54.769951105 CEST	43594	4445	192.168.2.15	10.5.31.54
Sep 5, 2023 18:29:10.898530960 CEST	43594	4445	192.168.2.15	10.5.31.54

UDP Packets

Timestamp	Source Port	Dest Port	Source IP	Dest IP
Sep 5, 2023 18:31:19.848263025 CEST	55749	53	192.168.2.15	1.1.1.1
Sep 5, 2023 18:31:19.848346949 CEST	46351	53	192.168.2.15	1.1.1.1
Sep 5, 2023 18:31:19.968030930 CEST	53	46351	1.1.1.1	192.168.2.15
Sep 5, 2023 18:31:19.969556093 CEST	53	55749	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
Sep 5, 2023 18:31:19.848263025 CEST	192.168.2.15	1.1.1.1	0x8cfc	Standard query (0)	daisy.ubuntu.com	A (IP address)	IN (0x0001)	false
Sep 5, 2023 18:31:19.848346949 CEST	192.168.2.15	1.1.1.1	0x919d	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 5, 2023 18:31:19.969556093 CEST	1.1.1.1	192.168.2.15	0x8cfc	No error (0)	daisy.ubuntu.com		185.125.188.136	A (IP address)	IN (0x0001)	false
Sep 5, 2023 18:31:19.969556093 CEST	1.1.1.1	192.168.2.15	0x8cfc	No error (0)	daisy.ubuntu.com		185.125.188.137	A (IP address)	IN (0x0001)	false

System Behavior

Analysis Process: r5sPBYZoeg.elf PID: 5544, Parent PID: 5444

General

Start time:	16:28:38
Start date:	05/09/2023
Path:	/tmp/r5sPBYZoeg.elf
Arguments:	/tmp/r5sPBYZoeg.elf
File size:	302 bytes
MD5 hash:	cb42acc26fc460bf02b00f38ca4b430b

Description:	Adversaries may use a 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:	Host network interface, Netflow/Enclave netflow, Network intrusion detection system, Network protocol analysis, Packet capture, Process use of network
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may communicate using 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:	DNS records, Netflow/Enclave netflow, Network protocol analysis, Packet capture, Process monitoring, Process use of network
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Behavior Section

Behavior Chronological

Disassembly

Uncategorized

Graph

Loading Joe Sandbox Report ...

Warning!

Linux Analysis Report r5sPBYZoeg.elf

Overview

General Information

Detection

Signatures

Classification

General Information

Warnings

Runtime Messages

Process Tree

Malware Threat Intel

Yara Signatures

Memory Dumps

Snort 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

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

Static ELF Info

ELF header

Program Segments

Network Behavior

Network Port Distribution

TCP Packets

UDP Packets

DNS Queries

DNS Answers

System Behavior

Analysis Process: r5sPBYZoeg.elf PID: 5544, Parent PID: 5444

General

Linux Analysis Report
r5sPBYZoeg.elf