MalwareBazaar Database
You are currently viewing the MalwareBazaar entry for SHA256 50756b5cbf522662f76022571c154d9ae013b796482240b7f88ff874a7c4d5e1. 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
Formbook
Vendor detections: 10
| SHA256 hash: | 50756b5cbf522662f76022571c154d9ae013b796482240b7f88ff874a7c4d5e1 |
|---|---|
| SHA3-384 hash: | 42534b89c73cba9c8f58828d2e2e78aa47b5d4ca100196032231f1c5d131243e8f64588dbbfb3888a2b4d2534b0eb3e4 |
| SHA1 hash: | 2434ec6c9a616b3363ca349e1555f3724662cbe7 |
| MD5 hash: | 867ecfbb8cb26a736348165181258b2e |
| humanhash: | robin-eighteen-freddie-paris |
| File name: | INVOICE.r15 |
| Download: | download sample |
| Signature | Formbook |
| File size: | 1'065'960 bytes |
| First seen: | 2025-09-29 10:10:08 UTC |
| Last seen: | 2025-09-30 10:28:25 UTC |
| File type: | rar |
| MIME type: | application/x-rar |
| ssdeep | 24576:eTFcjz336NA0gbPqnC27WYdBbkf/RtGoagHUgDpF:GFBA0gbrYdB4nRNnHUgD3 |
| Threatray | 1'576 similar samples on MalwareBazaar |
| TLSH | T19535338DDF0AD386DB58FAC291D13242280787E57D8E57DF0E740C1A5E8A86C60B7E97 |
| TrID | 58.3% (.RAR) RAR compressed archive (v-4.x) (7000/1) 41.6% (.RAR) RAR compressed archive (gen) (5000/1) |
| Magika | rar |
| Reporter |  cocaman |
| Tags: | FormBook GuLoader INVOICE payment r15 rar |
cocaman
Malicious email (T1566.001)From: "vanessa.wang@skf.com" (likely spoofed)
Received: "from [91.92.242.11] (unknown [91.92.242.11]) "
Date: "30 Sep 2025 03:15:07 -0700"
Subject: "RE: Confirm revised invoice to proceed with payment ASAP."
Attachment: "INVOICE.r15"
Intelligence
File Origin
# of uploads :
4
# of downloads :
101
Origin country :
CHFile Archive Information
This file archive contains 2 file(s), sorted by their relevance:
| File name: | INVOICE.exe |
|---|---|
| File size: | 768'512 bytes |
| SHA256 hash: | 3189a2a8530b26f87a47c614fd895e197d7fd0fc0900ae8551b44114b277dec8 |
| MD5 hash: | 9ad804c7432ad16d21e0bd3a0a01bc92 |
| MIME type: | application/x-dosexec |
| Signature | Formbook |
| File name: | Invoice.bat |
|---|---|
| File size: | 382'970 bytes |
| SHA256 hash: | e770d4bd2d65dbb979c56054b2ba5b2b6c862e8a55a9769c1c762dd73febe81c |
| MD5 hash: | 55cf812788692306c413aad62ba65b6c |
| MIME type: | application/x-dosexec |
| Signature | GuLoader |
Vendor Threat Intelligence
Detection(s):
Verdict:
Malicious
Score:
70%
Tags:
injection blic
Verdict:
Likely Malicious
Threat level:
7.5/10
Confidence:
100%
Tags:
masquerade packed vbnet
Verdict:
Suspicious
Labled as:
Mal/DrodRar
Verdict:
Malicious
File Type:
rar
First seen:
2025-09-29T04:39:00Z UTC
Last seen:
2025-09-29T04:39:00Z UTC
Hits:
~100
Detections:
Trojan.Win32.Guloader.dcy HEUR:Trojan.Win32.GuLoader.gen
Verdict:
inconclusive
YARA:
2 match(es)
Tags:
.Net Executable Managed .NET PDB Path PE (Portable Executable) PE File Layout Rar Archive SOS: 0.44
Verdict:
Malicious
Threat:
Family.FORMBOOK
Threat name:
Win32.Trojan.Guloader
Status:
Malicious
First seen:
2025-09-29 10:10:11 UTC
File Type:
Binary (Archive)
Extracted files:
18
AV detection:
29 of 37 (78.38%)
Threat level:
5/5
Detection(s):
Malicious file
Verdict:
malicious
Label(s):
formbook
unc_loader_037
Similar samples:
+ 1'566 additional samples on MalwareBazaar
Result
Malware family:
guloader
Score:
10/10
Tags:
family:formbook family:guloader discovery downloader execution installer rat spyware stealer trojan
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Suspicious use of SetThreadContext
Checks computer location settings
Command and Scripting Interpreter: PowerShell
Formbook payload
Formbook
Formbook family
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Legit
Score:
0.00
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: | CP_AllMal_Detector |
|---|---|
| Author: | DiegoAnalytics |
| Description: | CrossPlatform All Malwares Detector: Detect PE, ELF, Mach-O, scripts, archives; overlay, obfuscation, encryption, spoofing, hiding, high entropy, network communication |
| Rule name: | Ins_NSIS_Buer_Nov_2020_1 |
|---|---|
| Author: | Arkbird_SOLG |
| Description: | Detect NSIS installer used for Buer loader |
| Rule name: | NET |
|---|---|
| Author: | malware-lu |
| Rule name: | pe_imphash |
|---|
| Rule name: | pe_no_import_table |
|---|---|
| Description: | Detect pe file that no import table |
| Rule name: | shellcode |
|---|---|
| Author: | nex |
| Description: | Matched shellcode byte patterns |
| Rule name: | Skystars_Malware_Imphash |
|---|---|
| Author: | Skystars LightDefender |
| Description: | imphash |
| Rule name: | win32_dotnet_form_obfuscate |
|---|---|
| Author: | Reedus0 |
| Description: | Rule for detecting .NET form obfuscate malware |
File information
The table below shows additional information about this malware sample such as delivery method and external references.
Malspam
GuLoader
rar 50756b5cbf522662f76022571c154d9ae013b796482240b7f88ff874a7c4d5e1
(this sample)
exe Delivery method
Distributed via e-mail attachment
Dropping
GuLoader
Dropping
Formbook
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