MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 39757ff17030e983082ea45fe748092f6574774586e6f034d260dc37411b39c9. 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

Threat unknown

Vendor detections: 5

Intelligence 5 IOCs YARA 33 File information Comments

SHA256 hash:	39757ff17030e983082ea45fe748092f6574774586e6f034d260dc37411b39c9
SHA3-384 hash:	6dd020a1a63f860883c6e7c2db7bfb78e1bed6201612e5d22889de42e04597290d899cf77466524670a39c06ed150d4f
SHA1 hash:	117cec59bd5cfcd9aac24ba5286d3a4a96c29cd3
MD5 hash:	07dcf1a2f50f856bd3553767cb65cc1c
humanhash:	uranus-glucose-may-whiskey
File name:	nix-update
Download:	download sample
File size:	12'296'340 bytes
First seen:	2026-10-27 15:51:42 UTC
Last seen:	Never
File type:	elf
MIME type:	application/x-executable
ssdeep	98304:dqkd3/emiRzLiZQFLpRZvPf8nSlLGFFLSBxkZflZ0BNfHE6:djqRviZQFfNlL2W26
TLSH	T101C65B07E86105E8C0EDD130C6669263BA717C499F3123D72F90F7682FB6BE06A79794
telfhash	t139324b704dbc39b4b69ada11b3a3b4b4567719a562f834f15063ad84ffc1e805ce2837
gimphash	e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
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	yueyinqiu
Tags:	elf

yueyinqiu

It appeared on my NixOS laptop disguised as a "nix-update" / "nix-auto-update" systemd user service (plain files, not nix-managed symlinks into the store). Reasons I believe it's malicious:
(1) Its C2 is 139.180.189.72 / pytorch-models-cdn.com — a domain I do not know, and that IP has been flagged as #C2 in threat intel since 2025-01.
(2) Heavily obfuscated: garble, buildinfo stripped, C2 domain encrypted at rest — normal tools don't do this.
(3) Installed silently on 2026-10-22 by a scripted burst (no shell/ssh/cron trace), and it even disguised the daemon-reload as "reload fwupd.service".
(4) It's a customized ligolo-ng (reverse-tunnel/pivoting) with added file upload/download + PSK auth + post-quantum crypto — i.e. a backdoor.
I never installed it and can't trace the entry vector. Any recognition of this build or its operator would be appreciated.

Intelligence

File Origin

# of uploads :

# of downloads :

Origin country :

Vendor Threat Intelligence

No detections

Verdict:

Malicious

Uses P2P?:

false

Uses anti-vm?:

true

Architecture:

x86

Packer:

not packed

Botnet:

unknown

Number of open files:

Number of processes launched:

Processes remaning?

false

Remote TCP ports scanned:

not identified

Full report:

https://elfdigest.com/brief/39757ff17030e983082ea45fe748092f6574774586e6f034d260dc37411b39c9

Behaviour

Anti-VM

Botnet C2s

TCP botnet C2(s):

not identified

UDP botnet C2(s):

not identified

Verdict:

Unknown

File Type:

elf.64.le

Link:

https://opentip.kaspersky.com/39757ff17030e983082ea45fe748092f6574774586e6f034d260dc37411b39c9/results?tab=lookup

Status:

terminated

Link:

https://sandbox.kunai.rocks/analysis/e20722fa-9301-4f5a-b3cf-66ed36491a2c

Behavior Graph:

Download SVG

Verdict:

Suspicious

Link:

https://analyze.intezer.com/analyses/eccd5637-0c18-4243-b86b-e01649737a33

Result

Threat name:

n/a

Detection:

clean

Classification:

n/a

Score:

1 / 100

Link:

https://www.joesandbox.com/analysis/1992996

Behaviour

Behavior Graph:

n/a

Score:

100%

Verdict:

Malware

File Type:

ELF

Link:

https://malprob.io/report/39757ff17030e983082ea45fe748092f6574774586e6f034d260dc37411b39c9

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/39757ff17030e983082ea45fe748092f6574774586e6f034d260dc37411b39c9/

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=hf2x74lqgduygcbourp6osajf5sxi52fq3tpangsmdodoqi3hheq._file

Result

Malware family:

n/a

Score:

3/10

Tags:

discovery linux

Link:

https://tria.ge/reports/261027-tcatdavwf1/

Behaviour

Enumerates kernel/hardware configuration

Reads runtime system information

Please note that we are no longer able to provide a coverage score for Virus Total.

Threat name:

Suspicious File

Score:

0.59

Link:

https://yomi.yoroi.company/submissions/39757ff17030e983082ea45fe748092f6574774586e6f034d260dc37411b39c9

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:	CP_Script_Inject_Detector Create hunting rule
Author:	DiegoAnalytics
Description:	Detects attempts to inject code into another process across PE, ELF, Mach-O binaries

Rule name:	dependsonpythonailib Create hunting rule
Author:	Tim Brown
Description:	Hunts for dependencies on Python AI libraries

Rule name:	DetectEncryptedVariants Create hunting rule
Author:	Zinyth
Description:	Detects 'encrypted' in ASCII, Unicode, base64, or hex-encoded

Rule name:	DetectGoMethodSignatures Create hunting rule
Author:	Wyatt Tauber
Description:	Detects Go method signatures in unpacked Go binaries

Rule name:	Detect_Go_GOMAXPROCS Create hunting rule
Author:	Obscurity Labs LLC
Description:	Detects Go binaries by the presence of runtime.GOMAXPROCS in the runtime metadata

Rule name:	enterpriseapps2 Create hunting rule
Author:	Tim Brown @timb_machine
Description:	Enterprise apps

Rule name:	enterpriseunix2 Create hunting rule
Author:	Tim Brown @timb_machine
Description:	Enterprise UNIX

Rule name:	exploit_any_poppopret Create hunting rule
Author:	Jeff White [karttoon@gmail.com] @noottrak
Description:	Identify POP -> POP -> RET opcodes for quick ROP Gadget creation in target binaries.

Rule name:	F01_s1ckrule Create hunting rule
Author:	s1ckb017

Rule name:	FreddyBearDropper Create hunting rule
Author:	Dwarozh Hoshiar
Description:	Freddy Bear Dropper is dropping a malware through base63 encoded powershell scrip.

Rule name:	GoBinTest Create hunting rule

Rule name:	golang Create hunting rule

Rule name:	golang_binary_string Create hunting rule
Description:	Golang strings present

Rule name:	golang_duffcopy_amd64 Create hunting rule

Rule name:	Golang_Find_CSC846 Create hunting rule
Author:	Ashar Siddiqui
Description:	Find Go Signatuers

Rule name:	Golang_Find_CSC846_Simple Create hunting rule
Author:	Ashar Siddiqui
Description:	Find Go Signatuers

Rule name:	identity_golang Create hunting rule
Author:	Eric Yocam
Description:	find Golang malware

Rule name:	LIN_Sample_Unique_4c099562 Create hunting rule
Author:	Marjoriefort
Description:	Detects Unknown (elf, etat binaire)

Rule name:	MD5_Constants Create hunting rule
Author:	phoul (@phoul)
Description:	Look for MD5 constants

Rule name:	MULTI_Malware_RemcosRAT_ForgeAuto_4785f0c3 Create hunting rule
Author:	Marjoriefort
Description:	Detects RemcosRAT (inconnu, etat binaire)

Rule name:	ProgramLanguage_Golang Create hunting rule
Author:	albertzsigovits
Description:	Application written in Golang programming language

Rule name:	RANSOMWARE Create hunting rule
Author:	ToroGuitar

Rule name:	RIPEMD160_Constants Create hunting rule
Author:	phoul (@phoul)
Description:	Look for RIPEMD-160 constants

Rule name:	SCRIPT_Dropper_Unknown_ForgeAuto_0507f067_Script Create hunting rule
Author:	Marjoriefort
Description:	Detects Unknown (script_js, etat script)

Rule name:	setsockopt Create hunting rule
Author:	Tim Brown @timb_machine
Description:	Hunts for setsockopt() red flags

Rule name:	SHA1_Constants Create hunting rule
Author:	phoul (@phoul)
Description:	Look for SHA1 constants

Rule name:	SHA512_Constants Create hunting rule
Author:	phoul (@phoul)
Description:	Look for SHA384/SHA512 constants

Rule name:	SUSP_HTML_XMLHTTP_Redirect_Kit Create hunting rule
Author:	Marjoriefort
Description:	HTML avec exfiltration XMLHTTP + redirection window.location - kit phishing frais
Reference:	Veille fraicheur 2026-09-14 / cluster HTML

Rule name:	telebot_framework Create hunting rule
Author:	vietdx.mb

Rule name:	test_Malaysia Create hunting rule
Author:	rectifyq
Description:	Detects file containing malaysia string

Rule name:	TH_Generic_MassHunt_Linux_Malware_2026_CYFARE Create hunting rule
Author:	CYFARE
Description:	Generic Linux malware mass-hunt rule - 2026
Reference:	https://cyfare.net/

Rule name:	unixredflags3 Create hunting rule
Author:	Tim Brown @timb_machine
Description:	Hunts for UNIX red flags

Rule name:	vmdetect Create hunting rule
Author:	nex
Description:	Possibly employs anti-virtualization techniques

File information

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

Link

https://discourse.nixos.org/t/found-a-backdoor-on-my-nixos-laptop-disguised-as-a-nix-update-service/80793

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