MalwareBazaar Database
You are currently viewing the MalwareBazaar entry for SHA256 a91e965e1422ffbb4deb3ced4f57609424a8f5bd35f074db40ef42531367353a. 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
| SHA256 hash: | a91e965e1422ffbb4deb3ced4f57609424a8f5bd35f074db40ef42531367353a |
|---|---|
| SHA3-384 hash: | 0fc50868cb1139d86be9f85cd3d885230734de0a53ab616044891830ab54771a01a47cfd65ad231a50409db9c9f1cccf |
| SHA1 hash: | cc7eb21103419c4e67e18e697cebca029b03b00c |
| MD5 hash: | 5f4209c578ec6787f8b516885ae42851 |
| humanhash: | august-nine-pennsylvania-sierra |
| File name: | windefenderupdate.exe |
| Download: | download sample |
| Signature | RustyStealer |
| File size: | 503'296 bytes |
| First seen: | 2026-09-24 20:04:27 UTC |
| Last seen: | Never |
| File type: |  exe |
| MIME type: | application/x-dosexec |
| imphash | c0d1c6f991a15bc3249d9a845ef9c2ad (1 x RustyStealer) |
| ssdeep | 6144:+kFCHJbrT4OP1AEgYt3aem3e4l2yaglPbJxQ0ql5bxkS3kzQ1w1/mYcbCoNq5boU:+k0HJbrTASMHlokz4bK7zAV+ |
| TLSH | T145B47E52F79547F8D0ABC07483478963AA3274C60721F9EF16D452342F2AAE25F3DB29 |
| TrID | 51.9% (.EXE) Win64 Executable (generic) (6522/11/2) 16.1% (.EXE) OS/2 Executable (generic) (2029/13) 15.9% (.EXE) Generic Win/DOS Executable (2002/3) 15.9% (.EXE) DOS Executable (generic) (2000/1) |
| Magika | pebin |
| Reporter |  KnownSpotter |
| Tags: | exe RustyStealer |
Intelligence
File Origin
# of uploads :
1
# of downloads :
175
Origin country :
CAVendor Threat Intelligence
No detections
Malware family:
n/a
ID:
1
File name:
exe
Verdict:
Malicious activity
Analysis date:
2026-09-24 21:29:18 UTC
Tags:
evasion auto-sch auto-startup auto-reg ransomware
Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
n/a
Result
Verdict:
Malware
Maliciousness:
Behaviour
Running batch commands
Launching a process
Сreating synchronization primitives
Modifying a system file
Searching for synchronization primitives
Searching for the window
Using the Windows Management Instrumentation requests
Deleting volume shadow copies
Launching a tool to kill processes
Verdict:
Malicious
Threat level:
10/10
Confidence:
100%
Tags:
anti-debug anti-vm base64 cmd crypto evasive expand lolbin ransomware reconnaissance rust schtasks
Verdict:
Malicious
Labled as:
Gen:Ransom.REntS.Generic
Verdict:
Malicious
File Type:
exe x64
First seen:
2026-08-31T12:46:00Z UTC
Last seen:
2026-09-25T18:08:00Z UTC
Hits:
~10
Verdict:
Malicious
Score:
87%
Verdict:
Malware
File Type:
PE
Verdict:
inconclusive
YARA:
5 match(es)
Tags:
Executable PDB Path PE (Portable Executable) PE File Layout Win 64 Exe x64
Threat name:
Win64.Trojan.Delshad
Status:
Malicious
First seen:
2026-09-01 00:27:14 UTC
File Type:
PE+ (Exe)
AV detection:
22 of 38 (57.89%)
Threat level:
5/5
Detection(s):
Suspicious file
Verdict:
malicious
Label(s):
GenericRansomware
Result
Malware family:
n/a
Score:
10/10
Tags:
defense_evasion execution impact persistence privilege_escalation ransomware
Behaviour
Interacts with shadow copies
Kills process with taskkill
Modifies registry key
Scheduled Task/Job: Scheduled Task
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Uses Volume Shadow Copy service COM API
Executes a command shell one-liner
Drops file in Windows directory
Drops file in System32 directory
Adds Run key to start application
Creates a file in the Startup directory
Executes dropped EXE
Command and Scripting Interpreter: PowerShell
Deletes shadow copies
Unpacked files
SH256 hash:
a91e965e1422ffbb4deb3ced4f57609424a8f5bd35f074db40ef42531367353a
MD5 hash:
5f4209c578ec6787f8b516885ae42851
SHA1 hash:
cc7eb21103419c4e67e18e697cebca029b03b00c
Verdict:
Malicious
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
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: | DebuggerCheck__API |
|---|---|
| Reference: | https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara |
| Rule name: | DetectEncryptedVariants |
|---|---|
| Author: | Zinyth |
| Description: | Detects 'encrypted' in ASCII, Unicode, base64, or hex-encoded |
| Rule name: | detect_powershell |
|---|---|
| Author: | daniyyell |
| Description: | Detects suspicious PowerShell activity related to malware execution |
| Rule name: | Disable_Defender |
|---|---|
| Author: | iam-py-test |
| Description: | Detect files disabling or modifying Windows Defender, Windows Firewall, or Microsoft Smartscreen |
| Rule name: | golang_bin_JCorn_CSC846 |
|---|---|
| Author: | Justin Cornwell |
| Description: | CSC-846 Golang detection ruleset |
| Rule name: | INDICATOR_SUSPICIOUS_GENRansomware |
|---|---|
| Author: | ditekSHen |
| Description: | Detects command variations typically used by ransomware |
| Rule name: | pe_detect_tls_callbacks |
|---|
| Rule name: | ProgramLanguage_Rust |
|---|---|
| Author: | albertzsigovits |
| Description: | Application written in Rust programming language |
| Rule name: | RANSOMWARE |
|---|---|
| Author: | ToroGuitar |
| Rule name: | Rustyloader_mem_loose |
|---|---|
| Author: | James_inthe_box |
| Description: | Corroded buerloader |
| Reference: | https://app.any.run/tasks/83064edd-c7eb-4558-85e8-621db72b2a24 |
| Rule name: | SEH__vectored |
|---|---|
| Reference: | https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara |
| Rule name: | SUSP_Script_PowerShell_Hidden_Launcher |
|---|---|
| Author: | Marjoriefort |
| Description: | Script (JS/VBS) lancant PowerShell en mode furtif - dropper frais MalwareBazaar |
| Reference: | Veille fraicheur 2026-09-14 / cluster misses web |
| Rule name: | Sus_CMD_Powershell_Usage |
|---|---|
| Author: | XiAnzheng |
| Description: | May Contain(Obfuscated or no) Powershell or CMD Command that can be abused by threat actor(can create FP) |
| Rule name: | TigerRAT_pe_yaraify |
|---|---|
| Author: | hunts-yara-code |
| Description: | YARAify-tightened byte rule from 9 sample(s) -- VERIFY hits |
| Rule name: | VECT_Ransomware |
|---|---|
| Author: | Mustafa Bakhit |
| Description: | Detects activity associated with VECT ransomware. This includes registry modifications and deletions, execution of system and defense-evasion commands, suspicious API usage, mutex creation, file and memory manipulation, ransomware note generation, anti-debugging and anti-analysis techniques, and embedded cryptographic constants (SHA256) characteristic of this malware family. Designed for threat intelligence and malware detection environments. |
| Rule name: | WIN_SHADOW_UNPACKED |
|---|
File information
The table below shows additional information about this malware sample such as delivery method and external references.
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