MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 f9d39bd2cb0da8e023e6a968a515dab56a6b8bc4fec90deb340a7bfbb7ea112a. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.

Database Entry


ConnectBack


Vendor detections: 9


Intelligence 9 IOCs YARA 1 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: f9d39bd2cb0da8e023e6a968a515dab56a6b8bc4fec90deb340a7bfbb7ea112a
SHA3-384 hash: 551567d7dda42eb6553c1272533ea7fccf65820d50a77ec53f704f524b2d60f1fc78c644716b3d04e478d8cbd671382d
SHA1 hash: 0a613901aeca56a4248bde7fd331eae7debe22c4
MD5 hash: 4a92396f6a0b3b99012705a931e04010
humanhash: victor-tennessee-november-table
File name:mshell.elf
Download: download sample
Signature ConnectBack
Create hunting rule
File size:250 bytes
First seen:2025-07-05 00:46:53 UTC
Last seen:Never
File type: elf
MIME type:application/x-executable
ssdeep 6:BnX//In8/r1uBxHocmTq9Q3RQdygg5XJYD:BvwncrAH3meq532D
TLSH T1BBD080330F0F41DBDAD4023F6574599CD77B8976574963310890DC050C096045F52C75
TrID 50.1% (.) ELF Executable and Linkable format (Linux) (4022/12)
49.8% (.O) ELF Executable and Linkable format (generic) (4000/1)
Magika elf
Reporter abuse_ch
Tags:ConnectBack elf

Intelligence

File Origin
# of uploads :
1
# of downloads :
12
Origin country :
DE DE
Vendor Threat Intelligence
Detection(s):
Unix.Backdoor.Msfvenom-10012672-0
Create hunting rule

Verdict:
Clean
Score:
84.2%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6868770ac9eb974737666b5f
Tags:
n/a
Result
Verdict:
Malware
Maliciousness:

Behaviour
Connection attempt
Verdict:
Unknown
Threat level:
  0/10
Confidence:
100%
Link:
https://www.filescan.io/uploads/686876189db85bde254b4e9c/reports/2a70cb22-8aa1-46a8-9225-2ceaca7ba5bb/overview
Verdict:
Malicious
Uses P2P?:
false
Uses anti-vm?:
false
Architecture:
x86
Packer:
UPX
Botnet:
unknown
Number of open files:
0
Number of processes launched:
1
Processes remaning?
false
Remote TCP ports scanned:
not identified
Full report:
https://elfdigest.com/brief/f9d39bd2cb0da8e023e6a968a515dab56a6b8bc4fec90deb340a7bfbb7ea112a
Behaviour
no suspicious findings
Botnet C2s
TCP botnet C2(s):
not identified
UDP botnet C2(s):
not identified
Status:
terminated
Link:
https://sandbox.kunai.rocks/analysis/ca951e81-a490-4874-b3b9-613a0106558e
Behavior Graph:
Download SVG
%3 guuid=537cda80-1a00-0000-5460-4e9a620b0000 pid=2914 /usr/bin/sudo guuid=676a1084-1a00-0000-5460-4e9a650b0000 pid=2917 /tmp/sample.bin net guuid=537cda80-1a00-0000-5460-4e9a620b0000 pid=2914->guuid=676a1084-1a00-0000-5460-4e9a650b0000 pid=2917 execve a555acc4-0a3b-538b-8b8e-0e112ba4904a 103.165.81.230:10086 guuid=676a1084-1a00-0000-5460-4e9a650b0000 pid=2917->a555acc4-0a3b-538b-8b8e-0e112ba4904a con
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/3fa049a7-227a-423c-9006-f7397d24e444
Result
Threat name:
ConnectBack
Create hunting rule
Detection:
malicious
Classification:
troj
Score:
64 / 100
Link:
https://www.joesandbox.com/analysis/1729066
Signature
Found malware configuration
Multi AV Scanner detection for submitted file
Yara detected ConnectBack
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1729066 Sample: mshell.elf Startdate: 05/07/2025 Architecture: LINUX Score: 64 14 103.165.81.230, 10086, 38060, 38062 AARNET-AS-APAustralianAcademicandResearchNetworkAARNe unknown 2->14 16 169.254.169.254, 80 USDOSUS Reserved 2->16 18 4 other IPs or domains 2->18 20 Found malware configuration 2->20 22 Multi AV Scanner detection for submitted file 2->22 24 Yara detected ConnectBack 2->24 6 dash rm 2->6         started        8 dash rm 2->8         started        10 python3.8 dpkg 2->10         started        12 mshell.elf 2->12         started        signatures3 process4
Score:
100%
Verdict:
Malware
File Type:
ELF
Link:
https://malprob.io/report/f9d39bd2cb0da8e023e6a968a515dab56a6b8bc4fec90deb340a7bfbb7ea112a
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/f9d39bd2cb0da8e023e6a968a515dab56a6b8bc4fec90deb340a7bfbb7ea112a/
Threat name:
Linux.Backdoor.ConnectBack
Create hunting rule
Status:
Malicious
First seen:
2025-07-05 00:47:18 UTC
File Type:
ELF64 Little (Exe)
AV detection:
25 of 38 (65.79%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=7hjzxuwlbwuoai7gvfukkfo2wvvgxc6e73eq32zubj57xn7kceva._file
Result
Malware family:
connectback
Create hunting rule
Score:
  10/10
Tags:
family:connectback linux
Link:
https://tria.ge/reports/250705-a5ajjacq3w/
Malware Config
C2 Extraction:
103.165.81.230:10086
Verdict:
Malicious
Tags:
Unix.Backdoor.Msfvenom-10012672-0
YARA:
n/a
Link:
https://app.threat.zone/submission/d2c835c1-83a1-4183-b302-b0b5bfa3a7cb
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Legit
Score:
0.23
Link:
https://yomi.yoroi.company/submissions/f9d39bd2cb0da8e023e6a968a515dab56a6b8bc4fec90deb340a7bfbb7ea112a

YARA Signatures

MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.

Rule name:Linux_Trojan_Metasploit_69e20012
Create hunting rule
Author:Elastic Security

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Web download

ConnectBack

elf f9d39bd2cb0da8e023e6a968a515dab56a6b8bc4fec90deb340a7bfbb7ea112a

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/3575923/
  
Delivery method
Distributed via web download

BLint

The following table provides more information about this file using BLint. BLint is a Binary Linter to check the security properties, and capabilities in executables.

Findings
IDTitleSeverity
CHECK_NXMissing Non-Executable Memory Protectioncritical
CHECK_PIEMissing Position-Independent Executable (PIE) Protectionhigh

Comments