MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 6421948f83bcc1f517adc2556847074a25f8ea04a12be5ede19380f16fc18f50. 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: 12

Intelligence 12 IOCs YARA 26 File information Comments

SHA256 hash:	6421948f83bcc1f517adc2556847074a25f8ea04a12be5ede19380f16fc18f50
SHA3-384 hash:	1828775a03c23394900688a2a09198695bbe092676f6cd45490f575c31b5f733c2e06f0d2b0e69f30d18b71ac0c5f059
SHA1 hash:	8055458ebed7f501d06712613369b49255409ab9
MD5 hash:	13e38af57e2c456ef3bc16b44afdfd46
humanhash:	golf-freddie-pluto-king
File name:	RFQ-1579.zip
Download:	download sample
Signature	Formbook Create hunting rule
File size:	724'652 bytes
First seen:	2025-09-30 10:03:31 UTC
Last seen:	Never
File type:	zip
MIME type:	application/zip
ssdeep	12288:6OWfNzT8/VEVEpGzhET2Mp+taZtI+3E09S0YuzhOojYAMBeeLnwSu:TWRCurETyteI+009pYuz1jY/wN
TLSH	T156F423F45FB13D2F10C4D8A441B01E21824906B45CB916A9D263EB33A2F7DEBFA7254A
Magika	zip
Reporter	cocaman
Tags:	FormBook RFQ zip

cocaman

Malicious email (T1566.001)
From: ""Sagar Raykar"<sraykar@onececo.com>" (likely spoofed)
Received: "from onececo.com (unknown [172.245.12.88]) "
Date: "30 Sep 2025 11:30:13 +0200"
Subject: "RE: Urgent Request // RFQ-1579"
Attachment: "RFQ-1579.zip"

Intelligence

File Origin

# of uploads :

# of downloads :

Origin country :

File Archive Information

This file archive contains 1 file(s), sorted by their relevance:

File name:	RFQ-1579.exe
File size:	750'592 bytes
SHA256 hash:	af9e19b850ac8564ed2282c50b626f7e2baeb77dcd86a5936d09eb3248cee161
MD5 hash:	6c566769b4db850f4c1558cf1ae5ccff
MIME type:	application/x-dosexec
Signature	Formbook

Vendor Threat Intelligence

Verdict:

Malicious

Score:

91.7%

Link:

https://cyber-fortress.com/docs/result/index.php?id=68dbab1e40b7da0b4eb8d2d1

Tags:

spawn

Result

Verdict:

Malicious

File Type:

PE File

Link:

https://app.docguard.net/6421948f83bcc1f517adc2556847074a25f8ea04a12be5ede19380f16fc18f50/results/dashboard

Behaviour

BlacklistAPI detected

Verdict:

Likely Malicious

Threat level:

7.5/10

Confidence:

100%

Tags:

autoit compiled-script evasive fingerprint lolbin microsoft_visual_cc netsh packed packed packed phishing reg upx

Link:

https://www.filescan.io/uploads/68dbab316c140e5b35ffaac8/reports/cc28047a-c744-4aaf-87d4-3e27d1751465/overview

Verdict:

Suspicious

Labled as:

Mal/AuItInj

Link:

https://www.hybrid-analysis.com/sample/6421948f83bcc1f517adc2556847074a25f8ea04a12be5ede19380f16fc18f50

Result

Verdict:

MALICIOUS

Link:

https://labs.inquest.net/dfi/sha256/6421948f83bcc1f517adc2556847074a25f8ea04a12be5ede19380f16fc18f50

Details

Windows PE Executable

Found a Windows Portable Executable (PE) binary. Depending on context, the presence of a binary is suspicious or malicious.

Verdict:

Malicious

File Type:

zip

First seen:

2025-09-29T21:43:00Z UTC

Last seen:

2025-09-29T21:48:00Z UTC

Hits:

~10

Link:

https://opentip.kaspersky.com/6421948f83bcc1f517adc2556847074a25f8ea04a12be5ede19380f16fc18f50/results?tab=lookup

Score:

100%

Verdict:

Malware

File Type:

Result

Malware family:

formbook

Score:

10/10

Tags:

family:formbook discovery rat spyware stealer trojan upx

Link:

https://tria.ge/reports/250930-njl74awsdx/

Behaviour

Suspicious behavior: EnumeratesProcesses

Suspicious behavior: MapViewOfSection

Suspicious use of FindShellTrayWindow

Suspicious use of SendNotifyMessage

Suspicious use of WriteProcessMemory

Program crash

System Location Discovery: System Language Discovery

AutoIT Executable

Suspicious use of SetThreadContext

UPX packed file

Formbook payload

Formbook

Formbook family

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

Threat name:

Suspicious File

Score:

0.53

Link:

https://yomi.yoroi.company/submissions/6421948f83bcc1f517adc2556847074a25f8ea04a12be5ede19380f16fc18f50

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

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

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

Rule name:	DebuggerHiding__Thread 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:	dgaagas Create hunting rule
Author:	Harshit
Description:	Uses certutil.exe to download a file named test.txt

Rule name:	Formbook Create hunting rule
Author:	kevoreilly
Description:	Formbook Payload

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

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

Rule name:	meth_stackstrings Create hunting rule
Author:	Willi Ballenthin

Rule name:	pe_detect_tls_callbacks Create hunting rule

Rule name:	pe_no_import_table Create hunting rule
Description:	Detect pe file that no import table

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:	shellcode Create hunting rule
Author:	nex
Description:	Matched shellcode byte patterns

Rule name:	UPXV200V290MarkusOberhumerLaszloMolnarJohnReiser Create hunting rule
Author:	malware-lu

Rule name:	upx_largefile Create hunting rule
Author:	k3nr9

Rule name:	win_formbook_g0 Create hunting rule
Author:	Slavo Greminger, SWITCH-CERT

Rule name:	win_upx_packed Create hunting rule
Author:	Reedus0
Description:	Rule for detecting UPX packed malware

File information

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

Malspam

Formbook

zip 6421948f83bcc1f517adc2556847074a25f8ea04a12be5ede19380f16fc18f50

(this sample)

Formbook

exe af9e19b850ac8564ed2282c50b626f7e2baeb77dcd86a5936d09eb3248cee161

Delivery method

Distributed via e-mail attachment

Dropping

SHA256 af9e19b850ac8564ed2282c50b626f7e2baeb77dcd86a5936d09eb3248cee161

Dropping

Formbook

Dropping

MD5 6c566769b4db850f4c1558cf1ae5ccff

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