MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 dfef2a4891f8b740e75b04a676fe4cb1657e3ab8ded9cb5f50be804068205c97. 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

RustyStealer

Vendor detections: 11

Intelligence 11 IOCs YARA 50 File information Comments

SHA256 hash:	dfef2a4891f8b740e75b04a676fe4cb1657e3ab8ded9cb5f50be804068205c97
SHA3-384 hash:	9f21b3705f40bed664e4a1411502dedea88159f04d7999f1811010e344ee745b6270b6c081a4a0b96ff875c67fa23c6b
SHA1 hash:	36b1dc13c134770d0233aee883dd46d0768a703a
MD5 hash:	ccdc4a9f41056bdf8d6ab0fb3b374fd4
humanhash:	social-johnny-artist-pasta
File name:	file
Download:	download sample
Signature	RustyStealer Create hunting rule
File size:	8'214'160 bytes
First seen:	2026-04-04 17:18:23 UTC
Last seen:	2026-04-05 06:25:11 UTC
File type:	exe
MIME type:	application/x-dosexec
imphash	d42595b695fc008ef2c56aabd8efd68e (639 x Vidar, 198 x RemusStealer, 109 x Stealc)
ssdeep	98304:cKlgv7YPBEvENoleUcxAVNeEQkHt0dLSq2SlVPn3RpZbRNA3l:cIgDYPBEvENo0YnF2LxBrn39El
TLSH	T1BE86E1C76FB50DB4D551137499E6698132B2AF2C8BB033C33D89DD204A697DE68FA702
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	Bitsight
Tags:	a dropped-by-gcleaner exe PMIX0.file RustyStealer signed

Code Signing Certificate

Organisation:	1575d9b8.sni.cloudflaressl.com
Issuer:	E8
Algorithm:	sha256WithRSAEncryption
Valid from:	2026-03-31T23:03:53Z
Valid to:	2026-06-29T23:03:52Z
Serial number:	05bd3c63dff6a0d7f4a5bbbb5a754276e0de
Intelligence:	18 malware samples on MalwareBazaar are signed with this code signing certificate
Thumbprint Algorithm:	SHA256
Thumbprint:	fb907c8636f9eb1915a2438eefbad69a5cfbcfe2edd6c12827b69648346f8520
Source:	This information was brought to you by ReversingLabs A1000 Malware Analysis Platform

Bitsight

url: http://158.94.209.95/service

Intelligence

File Origin

# of uploads :

# of downloads :

179

Origin country :

Vendor Threat Intelligence

Gathering data

Malware family:

n/a

ID:

File name:

file

Verdict:

Malicious activity

Analysis date:

2026-04-04 17:21:39 UTC

Tags:

ip-check golang auto-sch

Link:

https://app.any.run/tasks/2442cf21-d38a-4e70-be01-22d6e628b014

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/60443/

Verdict:

Malicious

Score:

99.9%

Link:

https://cyber-fortress.com/docs/result/index.php?id=69d1481766ab6d001dcece5f

Tags:

emotet shell micro sage

Result

Verdict:

Malware

Maliciousness:

Behaviour

Sending a custom TCP request

Using the Windows Management Instrumentation requests

Launching a process

Running batch commands

Searching for the window

Creating a file

Enabling the 'hidden' option for recently created files

Creating a file in the %AppData% subdirectories

Launching a tool to kill processes

Forced shutdown of a system process

Adding an exclusion to Microsoft Defender

Verdict:

Likely Malicious

Threat level:

7.5/10

Confidence:

100%

Tags:

adaptive-context crypt golang packed signed

Link:

https://www.filescan.io/uploads/69d148122346b9da57bcf07d/reports/435f4049-39fe-4075-808b-cde5acfd5451/overview

Verdict:

Malicious

Labled as:

Win/malicious_confidence_90%

Link:

https://www.hybrid-analysis.com/sample/dfef2a4891f8b740e75b04a676fe4cb1657e3ab8ded9cb5f50be804068205c97

Verdict:

Malicious

File Type:

exe x64

First seen:

2026-04-04T14:26:00Z UTC

Last seen:

2026-04-05T13:48:00Z UTC

Hits:

~100

Detections:

Backdoor.Win64.Gsb.sb Backdoor.Win64.Gsb.gen

Link:

https://opentip.kaspersky.com/dfef2a4891f8b740e75b04a676fe4cb1657e3ab8ded9cb5f50be804068205c97/results?tab=lookup

Verdict:

Unknown

Link:

https://analyze.intezer.com/analyses/b50834cd-af81-499d-ab86-a7025fe06ce4

Score:

100%

Verdict:

Malware

File Type:

Link:

https://malprob.io/report/dfef2a4891f8b740e75b04a676fe4cb1657e3ab8ded9cb5f50be804068205c97

Verdict:

inconclusive

YARA:

4 match(es)

Tags:

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

Link:

https://app.malva.re/file/ccdc4a9f41056bdf8d6ab0fb3b374fd4

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/dfef2a4891f8b740e75b04a676fe4cb1657e3ab8ded9cb5f50be804068205c97/

Verdict:

Malicious

Threat:

Backdoor.Win64.Gsb

Link:

https://tip.neiki.dev/file/dfef2a4891f8b740e75b04a676fe4cb1657e3ab8ded9cb5f50be804068205c97

Threat name:

Win64.Spyware.Rustystealer

Status:

Suspicious

First seen:

2026-04-04 17:19:18 UTC

File Type:

PE+ (Exe)

AV detection:

16 of 37 (43.24%)

Threat level:

2/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=37xsuser7c3ubz23asthn7smwfsx4ovy33m4wx2qx2aea2balslq._file

Result

Malware family:

n/a

Score:

8/10

Tags:

defense_evasion discovery execution persistence spyware stealer

Link:

https://tria.ge/reports/260404-vvyhtsay4n/

Behaviour

Delays execution with timeout.exe

Kills process with taskkill

Modifies data under HKEY_USERS

Scheduled Task/Job: Scheduled Task

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Uses Task Scheduler COM API

Views/modifies file attributes

Hide Artifacts: Ignore Process Interrupts

Drops file in System32 directory

Enumerates processes with tasklist

Adds Run key to start application

Disables automatic submission of suspicious files to Microsoft by Windows Defender

Executes dropped EXE

Reads user/profile data of web browsers

Command and Scripting Interpreter: PowerShell

Disables one or more Microsoft Defender components

Sets file to hidden

Unpacked files

SH256 hash:

dfef2a4891f8b740e75b04a676fe4cb1657e3ab8ded9cb5f50be804068205c97

MD5 hash:

ccdc4a9f41056bdf8d6ab0fb3b374fd4

SHA1 hash:

36b1dc13c134770d0233aee883dd46d0768a703a

Link:

https://www.unpac.me/results/8dfe19e1-bc84-498f-8651-251fc3c1cb9e/

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

Threat name:

Legit

Score:

0.00

Link:

https://yomi.yoroi.company/submissions/dfef2a4891f8b740e75b04a676fe4cb1657e3ab8ded9cb5f50be804068205c97

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:	Check_OutputDebugStringA_iat Create hunting rule

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__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_powershell Create hunting rule
Author:	daniyyell
Description:	Detects suspicious PowerShell activity related to malware execution

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

Rule name:	Disable_Defender Create hunting rule
Author:	iam-py-test
Description:	Detect files disabling or modifying Windows Defender, Windows Firewall, or Microsoft Smartscreen

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:	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:	grakate_stealer_nov_2021 Create hunting rule

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

Rule name:	INDICATOR_SUSPICIOUS_EXE_SQLQuery_ConfidentialDataStore Create hunting rule
Author:	ditekSHen
Description:	Detects executables containing SQL queries to confidential data stores. Observed in infostealers

Rule name:	INDICATOR_SUSPICIOUS_PWSH_B64Encoded_Concatenated_FileEXEC Create hunting rule
Author:	ditekSHen
Description:	Detects PowerShell scripts containing patterns of base64 encoded files, concatenation and execution

Rule name:	pe_detect_tls_callbacks Create hunting rule

Rule name:	PE_Digital_Certificate Create hunting rule
Author:	albertzsigovits

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

Rule name:	ProgramLanguage_Rust Create hunting rule
Author:	albertzsigovits
Description:	Application written in Rust 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:	Rustyloader_mem_loose Create hunting rule
Author:	James_inthe_box
Description:	Corroded buerloader
Reference:	https://app.any.run/tasks/83064edd-c7eb-4558-85e8-621db72b2a24

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:	Suspicious_Process Create hunting rule
Author:	Security Research Team
Description:	Suspicious process creation

Rule name:	SUSP_Scheduled_Tasks_Create_From_Susp_Dir Create hunting rule
Author:	SECUINFRA Falcon Team
Description:	Detects a PowerShell Script that creates a Scheduled Task that runs from an suspicious directory

Rule name:	Sus_All_Windows_PE_Malware Create hunting rule
Author:	DiegoAnalytics
Description:	Detects Windows PE malware of all types, avoids non-executables like .html

Rule name:	Sus_CMD_Powershell_Usage Create hunting rule
Author:	XiAnzheng
Description:	May Contain(Obfuscated or no) Powershell or CMD Command that can be abused by threat actor(can create FP)

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

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/

Rule name:	upxHook Create hunting rule
Author:	@r3dbU7z
Description:	Detect artifacts from 'upxHook' - modification of UPX packer
Reference:	https://bazaar.abuse.ch/sample/6352be8aa5d8063673aa428c3807228c40505004320232a23d99ebd9ef48478a/

Rule name:	vbaproject_bin Create hunting rule
Author:	CD_R0M_
Description:	{76 62 61 50 72 6f 6a 65 63 74 2e 62 69 6e} is hex for vbaproject.bin. Macros are often used by threat actors. Work in progress - Ran out of time

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

Rule name:	WIN_FileFix_Detection Create hunting rule
Author:	dogsafetyforeverone
Description:	Detects FileFix social engineering technique that launches chained PowerShell and PHP commands from file explorer typed paths
Reference:	FileFix social engineering with PowerShell and PHP commands

File information

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

Web download

RustyStealer

exe dfef2a4891f8b740e75b04a676fe4cb1657e3ab8ded9cb5f50be804068205c97

(this sample)

Dropped by

Gcleaner

Delivery method

Distributed via web download

Cape

https://www.capesandbox.com/analysis/60443/

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