MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 3b1d59c71cf19f0be3f66f4ad7d89e3593bbcd1c461b835f663bce969d07dc53. 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

EpsteinClient

Vendor detections: 9

Intelligence 9 IOCs YARA 32 File information Comments

SHA256 hash:	3b1d59c71cf19f0be3f66f4ad7d89e3593bbcd1c461b835f663bce969d07dc53
SHA3-384 hash:	061c600fad8d73500df228e277fef4d7751aeecbc856b72bf732948a0022ab0fa944ccaef419c9590fde19aec783df2d
SHA1 hash:	6b1616f98baaa7528fa399674ac780498b8bd84e
MD5 hash:	01b52c3f023147284c8efe0c7b708b03
humanhash:	september-mountain-leopard-bacon
File name:	01b52c3f023147284c8efe0c7b708b03.exe
Download:	download sample
Signature	EpsteinClient Create hunting rule
File size:	10'044'416 bytes
First seen:	2026-08-18 15:49:19 UTC
Last seen:	Never
File type:	exe
MIME type:	application/x-dosexec
imphash	d42595b695fc008ef2c56aabd8efd68e (1'075 x Vidar, 327 x RemusStealer, 132 x Stealc)
ssdeep	196608:M3AuLfhprcQ1M6yRc/lhiR73n7TH/wjnOAPJ2k:Mwchf1hF+PH/wjnOM2
TLSH	T151A69D03EC9555EAC1A9A231C9B29253BB717C495B3263D76B50F3382F77BC06AB8710
TrID	33.1% (.EXE) Win64 Executable (generic) (6522/11/2) 25.6% (.EXE) Win16 NE executable (generic) (5038/12/1) 10.4% (.ICL) Windows Icons Library (generic) (2059/9) 10.3% (.EXE) OS/2 Executable (generic) (2029/13) 10.1% (.EXE) Generic Win/DOS Executable (2002/3)
Magika	pebin
Reporter	abuse_ch
Tags:	EpsteinClient exe

Intelligence

File Origin

# of uploads :

# of downloads :

148

Origin country :

Vendor Threat Intelligence

No detections

Malware family:

n/a

ID:

File name:

exe

Verdict:

No threats detected

Analysis date:

2026-08-18 17:42:05 UTC

Tags:

golang

Link:

https://app.any.run/tasks/4e1565a5-16bd-4582-a7b4-36ce87af77dc

Note:

ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample

Detection:

n/a

Link:

https://www.capesandbox.com/analysis/81810/

Result

Verdict:

Clean

Maliciousness:

Behaviour

DNS request

Connection attempt

Sending a custom TCP request

Verdict:

Malicious

Threat level:

10/10

Confidence:

100%

Tags:

anti-vm backdoor base64 crypto expand golang loader lolbin packed zebrocy

Link:

https://www.filescan.io/uploads/6a847f0ee5efe2f010b09990/reports/24e3c9e5-113d-42de-8742-4a7a476c8386/overview

Verdict:

Malicious

Labled as:

Win/grayware_confidence_60%

Link:

https://www.hybrid-analysis.com/sample/3b1d59c71cf19f0be3f66f4ad7d89e3593bbcd1c461b835f663bce969d07dc53

Verdict:

Suspicious

Link:

https://analyze.intezer.com/analyses/ba3d10fb-a119-489f-8d0d-9edfd1ac59a4

Result

Threat name:

Epstein Client

Detection:

malicious

Classification:

troj

Score:

80 / 100

Link:

https://www.joesandbox.com/analysis/1959787

Signature

Antivirus / Scanner detection for submitted sample

Antivirus detection for URL or domain

Malicious sample detected (through community Yara rule)

Multi AV Scanner detection for submitted file

Yara detected Epstein Client

Behaviour

Behavior Graph:

Download SVG

Score:

79%

Verdict:

Malware

File Type:

Link:

https://malprob.io/report/3b1d59c71cf19f0be3f66f4ad7d89e3593bbcd1c461b835f663bce969d07dc53

Verdict:

inconclusive

YARA:

3 match(es)

Tags:

Executable PE (Portable Executable) PE File Layout Win 64 Exe x64

Link:

https://app.malva.re/file/01b52c3f023147284c8efe0c7b708b03

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/3b1d59c71cf19f0be3f66f4ad7d89e3593bbcd1c461b835f663bce969d07dc53/

Threat name:

Win64.Trojan.Wacatac

Status:

Suspicious

First seen:

2026-08-12 11:44:58 UTC

File Type:

PE+ (Exe)

AV detection:

17 of 23 (73.91%)

Threat level:

5/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=hmovtry46gpqxy7wn5fnpwe6gwj3xti4iynygx3ghphjnhih3rjq._file

Verdict:

malicious

Label(s):

EpsteinClient

Link:

https://reports.threatray.com/3801e858-8367-439d-86d3-46d2e108e72d

Result

Malware family:

n/a

Score:

3/10

Tags:

n/a

Link:

https://tria.ge/reports/260818-s9mzjadl6w/

Unpacked files

SH256 hash:

3b1d59c71cf19f0be3f66f4ad7d89e3593bbcd1c461b835f663bce969d07dc53

MD5 hash:

01b52c3f023147284c8efe0c7b708b03

SHA1 hash:

6b1616f98baaa7528fa399674ac780498b8bd84e

Link:

https://www.unpac.me/results/7a967c3c-ccb8-4b4d-bafa-679b123beb69/

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

Threat name:

Malicious File

Score:

1.00

Link:

https://yomi.yoroi.company/submissions/3b1d59c71cf19f0be3f66f4ad7d89e3593bbcd1c461b835f663bce969d07dc53

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:	apt28_win_zebrocy_golang_loader_modified Create hunting rule
Author:	@VK_Intel
Description:	Detects unpacked modified APT28/Sofacy Zebrocy Golang.
Reference:	https://www.vkremez.com/2018/12/lets-learn-progression-of-apt28sofacy.html

Rule name:	command_and_control Create hunting rule
Author:	CD_R0M_
Description:	This rule searches for common strings found by malware using C2. Based on a sample used by a Ransomware group

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:	DebuggerCheck__QueryInfo Create hunting rule
Reference:	https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara

Rule name:	DebuggerException__ConsoleCtrl Create hunting rule
Reference:	https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara

Rule name:	DebuggerException__SetConsoleCtrl Create hunting rule
Reference:	https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara

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:	Detect_PowerShell_Obfuscation Create hunting rule
Author:	daniyyell
Description:	Detects obfuscated PowerShell commands commonly used in malicious scripts.

Rule name:	Gentlemen_Ransomware_Binary Create hunting rule
Author:	Bedrock Safeguard Inc.
Description:	Detects The Gentlemen ransomware binary (Go/Garble)
Reference:	https://github.com/Bedrock-Safeguard/gentlemen-decryptor

Rule name:	GoBinTest Create hunting rule

Rule name:	golang Create hunting rule

Rule name:	Golangmalware Create hunting rule
Author:	Dhanunjaya
Description:	Malware in Golang

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

Rule name:	golang_bin_JCorn_CSC846 Create hunting rule
Author:	Justin Cornwell
Description:	CSC-846 Golang detection ruleset

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:	HiveRansomware Create hunting rule
Author:	Dhanunjaya
Description:	Yara Rule To Detect Hive V4 Ransomware

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

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

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:	RemusStealer_GoPayload Create hunting rule
Author:	burger
Description:	Detects RemusStealer Go-compiled payload

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

Rule name:	SEH__vectored Create hunting rule
Reference:	https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara

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:	Suspicious_Golang_Binary Create hunting rule
Author:	Tim Machac
Description:	Triage: Golang-compiled binary with suspicious OS/persistence/network strings (not family-specific)

Rule name:	ThreadControl__Context Create hunting rule
Reference:	https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara

Rule name:	TH_AntiVM_MassHunt_Win_Malware_2026_CYFARE Create hunting rule
Author:	CYFARE
Description:	Detects Windows malware employing anti-VM / anti-sandbox evasion techniques across VMware, VirtualBox, Hyper-V, QEMU, Xen, and generic sandbox environments
Reference:	https://cyfare.net/

File information

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

Cape

https://www.capesandbox.com/analysis/81810/

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