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MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 91b5b3761ae2929d43e507841c68c15d7a619746a6fae2d3be22c796b5ea3298. 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: 17


Intelligence 17 IOCs YARA 5 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 91b5b3761ae2929d43e507841c68c15d7a619746a6fae2d3be22c796b5ea3298
SHA3-384 hash: dbf450894960b410b57165e609b2293b0c445d80294c0a803abe0603155d4d6b6f06644ba36f8b19781a4f8f7d3124da
SHA1 hash: e4638391580998b43ebee04e7b806dec01e07768
MD5 hash: 5b82fa1ff1e7cd949d63c2fa2c58ae26
humanhash: black-sodium-oregon-east
File name:BguMbwmuq6MAxoz.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:866'824 bytes
First seen:2026-05-20 17:57:41 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (49'247 x AgentTesla, 20'516 x Formbook, 12'378 x SnakeKeylogger)
ssdeep 12288:KK3nWLhUWRzTD9BydaHxz4tnYfRHl8ZSp8NPDkHep7C+w8c+T5ijbmkfdVqLM6/i:KYnyUWQdaVMwFSZ2WJp7CSYxlwggbe
Threatray 4'122 similar samples on MalwareBazaar
TLSH T1B405F11562A8AF52E9755BF805A1E5302BF12E1FE529E2464FD76CDFB860F900F04B83
TrID 73.9% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
6.6% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
6.6% (.EXE) Win64 Executable (generic) (6522/11/2)
4.5% (.EXE) Win32 Executable (generic) (4504/4/1)
2.0% (.ICL) Windows Icons Library (generic) (2059/9)
Magika pebin
dhash icon 79d4c8a8d4e87190 (3 x AgentTesla, 3 x Formbook, 1 x Loki)
Reporter TomU
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
1
# of downloads :
77
Origin country :
CH CH
Vendor Threat Intelligence
Malware configuration found for:
RoboSki
Details
Link:
https://research.acce.ciphertechsolutions.com/results/769f934e-cb07-4675-b499-02306a1a5032/
Malware family:
formbook
Create hunting rule
ID:
1
File name:
exe
Verdict:
Malicious activity
Analysis date:
2026-05-21 02:06:58 UTC
Tags:
auto-sch-xml formbook stealer xloader
Link:
https://app.any.run/tasks/91dc270e-3738-4c03-9a76-474d93bbcf33

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/66916/
Detection(s):
SecuriteInfo.com.Trojan.Packed2.50433.18905.21.UNOFFICIAL
Create hunting rule

Verdict:
Malicious
Score:
99.9%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6a0e0d804159ce11f601ebc8
Tags:
shell virus micro
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Sending a custom TCP request
Сreating synchronization primitives
Creating a process with a hidden window
Creating a file in the %AppData% directory
Enabling the 'hidden' option for recently created files
Adding an access-denied ACE
Creating a file in the %temp% directory
Launching a process
Creating a file
Launching cmd.exe command interpreter
Setting browser functions hooks
Adding an exclusion to Microsoft Defender
Enabling autorun by creating a file
Unauthorized injection to a system process
Unauthorized injection to a browser process
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
bitmap crypt expired-cert invalid-signature obfuscated packed signed stego vbnet
Link:
https://www.filescan.io/uploads/6a0dfba4efbd399b39c028b3/reports/79a23568-9520-4165-86fc-5e1017c92fa0/overview
Verdict:
Malicious
Labled as:
Genie8DN.Generic
Link:
https://www.hybrid-analysis.com/sample/91b5b3761ae2929d43e507841c68c15d7a619746a6fae2d3be22c796b5ea3298
Verdict:
Malicious
File Type:
exe x32
First seen:
2025-05-07T01:24:00Z UTC
Last seen:
2025-05-09T04:33:00Z UTC
Hits:
~10
Link:
https://opentip.kaspersky.com/91b5b3761ae2929d43e507841c68c15d7a619746a6fae2d3be22c796b5ea3298/results?tab=lookup
Malware family:
Formbook
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/b0f6b3d9-9ec9-45c9-8572-89434884c377
Score:
98%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/91b5b3761ae2929d43e507841c68c15d7a619746a6fae2d3be22c796b5ea3298
Gathering data
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/91b5b3761ae2929d43e507841c68c15d7a619746a6fae2d3be22c796b5ea3298/
Threat name:
Win32.Trojan.AgentTesla
Create hunting rule
Status:
Malicious
First seen:
2025-05-07 07:27:10 UTC
File Type:
PE (.Net Exe)
Extracted files:
27
AV detection:
27 of 38 (71.05%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=sg23g5q24kjj2q7fa6cby2gblv5gdf2gu35ofu56eldznnpkgkma._file
Verdict:
malicious
Label(s):
formbook
Create hunting rule
unc_loader_037
Create hunting rule
wannacryptor
Create hunting rule
Similar samples:
0013e6d899c343df37d42e9aea6a40a035021195b544f6c442ff98094501b5a0
Formbook
80c1a0b48688c83d7c1532da5d5871618838eea438a4262a0c36ff21d5914c2f
Formbook
83cdcf1f7b8b580c62b4bc74e0ec2eb1fb18e2229335179d4f333c6b5f52f4ae
Formbook
865d757dbd675369b749dd68b1da5f785900d98d39386376e3464422248fa561
Formbook
+ 4'112 additional samples on MalwareBazaar
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook campaign:hi13 discovery execution persistence rat spyware stealer trojan
Link:
https://tria.ge/reports/260520-wkk1esas7y/
Behaviour
Scheduled Task/Job: Scheduled Task
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
System Location Discovery: System Language Discovery
SmartAssembly .NET packer
Suspicious use of SetThreadContext
Checks computer location settings
Executes dropped EXE
Uses the VBS compiler for execution
Command and Scripting Interpreter: PowerShell
Family: Formbook
Formbook payload
Unpacked files
SH256 hash:
91b5b3761ae2929d43e507841c68c15d7a619746a6fae2d3be22c796b5ea3298
MD5 hash:
5b82fa1ff1e7cd949d63c2fa2c58ae26
SHA1 hash:
e4638391580998b43ebee04e7b806dec01e07768
Link:
https://www.unpac.me/results/8b0826f1-3b91-4482-9ee9-f13b2df7bcad/
SH256 hash:
d6aa76e00297fb7d6257fe996c1cb61fb2e164b334c23a22fb8b6167df126fa3
MD5 hash:
64e9ace9ca2e6e18faae678ecdcc1f54
SHA1 hash:
42b71be13209f74143df321c47d44a326dce29fc
Link:
https://www.unpac.me/results/8b0826f1-3b91-4482-9ee9-f13b2df7bcad/
SH256 hash:
6a8728bdf199cb2fe3a63cb8a2e6657e70214f046b08d9f0c2ed57100f24dd50
MD5 hash:
8345e6fb7d3b4fa69ac397f10e6c1d41
SHA1 hash:
71b04645f3813278737d63e0abd0acc4ec7a9bd2
Link:
https://www.unpac.me/results/8b0826f1-3b91-4482-9ee9-f13b2df7bcad/
SH256 hash:
f7b2a1307788383e625f5e97e8b6493d83d3d5dc92e6668b4021089c31f95b60
MD5 hash:
01dee027b928c11106c8eedee12872e5
SHA1 hash:
9688743d5cb6c7d6bf8bc89b32c8336f3f12293d
Detections:
win_formbook_w0
Create hunting rule
win_formbook_g0
Create hunting rule
win_formbook_auto
Create hunting rule
FormBook
Create hunting rule
Link:
https://www.unpac.me/results/8b0826f1-3b91-4482-9ee9-f13b2df7bcad/
Parent samples :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 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/91b5b3761ae2929d43e507841c68c15d7a619746a6fae2d3be22c796b5ea3298

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:INDICATOR_KB_CERT_7c1118cbbadc95da3752c46e47a27438
Create hunting rule
Author:ditekSHen
Description:Detects executables signed with stolen, revoked or invalid certificates
Rule name:NET
Create hunting rule
Author:malware-lu
Rule name:PE_Digital_Certificate
Create hunting rule
Author:albertzsigovits
Rule name:pe_imphash
Create hunting rule
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash

File information

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

Malspam

Formbook

Executable exe 91b5b3761ae2929d43e507841c68c15d7a619746a6fae2d3be22c796b5ea3298

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/66916/

Comments