MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 819d4d31b2c839fc0d8ea8dbcf7bc90b6ebb7f90e63d9b0dfc70078c1989f26d. 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: 13

Intelligence 13 IOCs YARA 30 File information Comments

SHA256 hash:	819d4d31b2c839fc0d8ea8dbcf7bc90b6ebb7f90e63d9b0dfc70078c1989f26d
SHA3-384 hash:	eb6c738bd9a855a341d56c1fc23e7851f335f1b174ff509a9edf245da675f2f375f8af81a681602df342a7f337218d3e
SHA1 hash:	25cd1d404424d40b9f83c3ff5431759fec18bed0
MD5 hash:	0f575e7cd23e5fd894c24610ffb2db5f
humanhash:	three-massachusetts-lemon-arizona
File name:	819d4d31b2c839fc0d8ea8dbcf7bc90b6ebb7f90e63d9b0dfc70078c1989f26d
Download:	download sample
Signature	Formbook Create hunting rule
File size:	2'716'672 bytes
First seen:	2026-11-09 08:53:28 UTC
Last seen:	Never
File type:	exe
MIME type:	application/vnd.microsoft.portable-executable
imphash	e3220b29bcb828d950472feec27bbc25 (2 x Formbook, 1 x AgentTesla)
ssdeep	49152:qidDZK+GOp0PSAwGIQ8JnjpzHVDLZHGABhtm6q:qiq7Sj3j/HFHw6q
TLSH	T120C5AD36B1838A71E5B6033049A9F3B096AEBE054731AA97F3D4F30D1C751969B2B353
TrID	38.2% (.EXE) Win64 Executable (generic) (6522/11/2) 26.4% (.EXE) Win32 Executable (generic) (4504/4/1) 11.8% (.EXE) OS/2 Executable (generic) (2029/13) 11.7% (.EXE) Generic Win/DOS Executable (2002/3) 11.7% (.EXE) DOS Executable (generic) (2000/1)
Magika	pebin
dhash icon	f4ecc4d0f0e8c8c4 (5 x Formbook, 2 x AgentTesla, 1 x DarkCloud)
Reporter	adrian__luca
Tags:	exe FormBook

Intelligence

File Origin

# of uploads :

# of downloads :

Origin country :

Vendor Threat Intelligence

No detections

Detection:

n/a

Link:

https://www.capesandbox.com/analysis/98642/

Gathering data

Result

Verdict:

Malware

Maliciousness:

Behaviour

Creating a file in the drivers directory

Creating a service

Launching a service

Loading a system driver

Creating a file

Creating a file in the %temp% directory

Creating a process from a recently created file

Sending a custom TCP request

Creating synchronization primitives

Launching a process

Forced system process termination

Enabling autorun for a service

Gathering data

Verdict:

Malicious

Labled as:

Win/malicious_confidence_70%

Link:

https://www.hybrid-analysis.com/sample/819d4d31b2c839fc0d8ea8dbcf7bc90b6ebb7f90e63d9b0dfc70078c1989f26d

Verdict:

Malicious

File Type:

exe x32

First seen:

2026-10-26T14:33:00Z UTC

Last seen:

2026-10-31T00:45:00Z UTC

Hits:

~100

Link:

https://opentip.kaspersky.com/819d4d31b2c839fc0d8ea8dbcf7bc90b6ebb7f90e63d9b0dfc70078c1989f26d/results?tab=lookup

Result

Threat name:

FormBook

Detection:

malicious

Classification:

troj.spyw.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/2001769

Behaviour

Behavior Graph:

n/a

Verdict:

inconclusive

YARA:

4 match(es)

Tags:

Executable PE (Portable Executable) PE File Layout Win 32 Exe x86

Link:

https://app.malva.re/file/0f575e7cd23e5fd894c24610ffb2db5f

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/819d4d31b2c839fc0d8ea8dbcf7bc90b6ebb7f90e63d9b0dfc70078c1989f26d/

Threat name:

Win32.Trojan.Negasteal

Status:

Suspicious

First seen:

2026-10-27 03:37:00 UTC

File Type:

PE (Exe)

Extracted files:

AV detection:

17 of 24 (70.83%)

Threat level:

5/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=qgou2mnsza47ydmovdn4666jbnxlw74q4y6zwdp4oadyygmj6jwq._file

Result

Malware family:

formbook

Score:

10/10

Tags:

family:formbook adware collection defense_evasion discovery persistence privilege_escalation rat spyware stealer trojan

Link:

https://tria.ge/reports/261109-kt2trawv2j/

Behaviour

Modifies Internet Explorer settings

Suspicious behavior: EnumeratesProcesses

Suspicious behavior: GetForegroundWindowSpam

Suspicious behavior: LoadsDriver

Suspicious behavior: MapViewOfSection

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

outlook_office_path

System Location Discovery: System Language Discovery

Suspicious use of SetThreadContext

Accesses Microsoft Outlook profiles

Executes dropped EXE

Drops file in Drivers directory

Sets service image path in registry

Family: Formbook

Formbook payload

Malware Family:

n/a

Verdict:

Malicious

Tags:

privilege_escalation rat

YARA:

DebuggerCheck__MemoryWorkingSet win_token

Link:

https://app.threat.zone/submission/f259ee60-57bb-4299-946f-367094263781

Unpacked files

SH256 hash:

819d4d31b2c839fc0d8ea8dbcf7bc90b6ebb7f90e63d9b0dfc70078c1989f26d

MD5 hash:

0f575e7cd23e5fd894c24610ffb2db5f

SHA1 hash:

25cd1d404424d40b9f83c3ff5431759fec18bed0

Link:

https://www.unpac.me/results/0972ba4e-928f-4562-bc67-fe5e2c503f3a/

SH256 hash:

2280e9e702f12f5875d61275632254aac6fa83128520f783749a9c9409d36d69

MD5 hash:

c30434bb209590f2bf9b661fe82a6da8

SHA1 hash:

41cf2b32d71b29d40a984bb1f74ba73f7928d625

Link:

https://www.unpac.me/results/0972ba4e-928f-4562-bc67-fe5e2c503f3a/

Malware family:

FormBook

Verdict:

Malicious

Link:

https://www.vmray.com/analyses/_mb/819d4d31b2c8/report/overview.html

Please 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/819d4d31b2c839fc0d8ea8dbcf7bc90b6ebb7f90e63d9b0dfc70078c1989f26d

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_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:	data_manipulation Create hunting rule
Author:	Serhii Kocherhan
Description:	Detects data manipulation routines including XOR encoding, Base64 references, and RC4 PRGA encryption

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

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

Rule name:	DebuggerCheck__MemoryWorkingSet Create hunting rule
Author:	Fernando Mercês
Description:	Anti-debug process memory working set size check
Reference:	http://www.gironsec.com/blog/2015/06/anti-debugger-trick-quicky/

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:	exploit_any_poppopret Create hunting rule
Author:	Jeff White [karttoon@gmail.com] @noottrak
Description:	Identify POP -> POP -> RET opcodes for quick ROP Gadget creation in target binaries.

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

Rule name:	Jupyter_infostealer Create hunting rule
Author:	CD_R0M_
Description:	Rule for Jupyter Infostealer/Solarmarker malware from september 2021-December 2022

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

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

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:	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:	TH_Win_ETW_Bypass_2025_CYFARE Create hunting rule
Author:	CYFARE
Description:	Windows ETW Bypass Detection Rule - 2025
Reference:	https://cyfare.net/

Rule name:	WIN_Malware_SalatStealer_ForgeAuto_542e717b Create hunting rule
Author:	Marjoriefort
Description:	Detects SalatStealer (pe, etat binaire)

Rule name:	WIN_Malware_Sliver_ForgeAuto_2ddb463c Create hunting rule
Author:	Marjoriefort
Description:	Detects Sliver (pe, etat binaire)

Rule name:	WIN_Malware_Unknown_ForgeAuto_2ffc3572 Create hunting rule
Author:	Marjoriefort
Description:	Detects Unknown (pe, etat binaire)

Rule name:	WIN_Malware_Unknown_ForgeAuto_4fa7e284_Extrait Create hunting rule
Author:	Marjoriefort
Description:	Detects Unknown (pe, etat extrait)

Rule name:	WIN_Malware_Unknown_ForgeAuto_5001c94c Create hunting rule
Author:	Marjoriefort
Description:	Detects Unknown (pe, etat binaire)

Rule name:	WIN_Malware_Unknown_ForgeAuto_ce8c5b46 Create hunting rule
Author:	Marjoriefort
Description:	Detects Unknown (pe, etat binaire)

Rule name:	WIN_Malware_ValleyRAT_ForgeAuto_401c5e16 Create hunting rule
Author:	Marjoriefort
Description:	Detects ValleyRAT (pe, etat binaire)

File information

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

Cape

https://www.capesandbox.com/analysis/98642/

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