MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 1336a81d27c381bfaefd7d763b6c93d593f9c181fe97522b8248d520c6b0e2ff. 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: 18

Intelligence 18 IOCs YARA 28 File information Comments

SHA256 hash:	1336a81d27c381bfaefd7d763b6c93d593f9c181fe97522b8248d520c6b0e2ff
SHA3-384 hash:	43055c9a8e3b7a032d204386038184035dbb87ab40c8bb0f6f54241abe09a2fc121f88ef557e074cdab6f4ce867677ff
SHA1 hash:	98bc9e05c63dd6577a46d56bda0eaafcba7c8786
MD5 hash:	d525479c1ec52ea1ff3429c90f3791f9
humanhash:	florida-floor-edward-glucose
File name:	rinvoiceAR29230714N.exe
Download:	download sample
Signature	Formbook Create hunting rule
File size:	732'160 bytes
First seen:	2025-08-21 03:00:14 UTC
Last seen:	2025-09-05 13:09:52 UTC
File type:	exe
MIME type:	application/x-dosexec
imphash	21371b611d91188d602926b15db6bd48 (61 x Formbook, 23 x AgentTesla, 20 x RemcosRAT)
ssdeep	12288:fz7hU5I5yuNHIgzSFKxWltRohBfSTso93U9xRvDT8+A8fN4QQY+rRx2qigzvE4+r:ff+iN57Gtene3WvnvDmQQLrnbtzE4rW
Threatray	346 similar samples on MalwareBazaar
TLSH	T1E5F42345A8919A95D604A330D236CCA049B939306E07A77EC76FF53B7C30397C86A75E
TrID	39.1% (.EXE) UPX compressed Win32 Executable (27066/9/6) 38.3% (.EXE) Win32 EXE Yoda's Crypter (26569/9/4) 7.2% (.EXE) Win16 NE executable (generic) (5038/12/1) 6.5% (.EXE) Win32 Executable (generic) (4504/4/1) 2.9% (.EXE) OS/2 Executable (generic) (2029/13)
Magika	pebin
dhash icon	aae2f3e38383b629 (2'034 x Formbook, 1'183 x CredentialFlusher, 666 x AgentTesla)
Reporter	FXOLabs
Tags:	exe FormBook

Intelligence

File Origin

# of uploads :

# of downloads :

Origin country :

Vendor Threat Intelligence

Malware family:

n/a

ID:

File name:

invoice AR29230714N.exe

Verdict:

No threats detected

Analysis date:

2025-08-21 03:02:49 UTC

Tags:

n/a

Link:

https://app.any.run/tasks/827ff32a-367e-4343-8f78-5ad5d22926c2

Note:

ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample

Detection:

Formbook

Link:

https://www.capesandbox.com/analysis/22646/

Verdict:

Malicious

Score:

70%

Link:

https://cyber-fortress.com/docs/result/index.php?id=68a68bf08fd55a79c52989cb

Tags:

spawn

Result

Verdict:

Malware

Maliciousness:

Behaviour

Creating a window

Creating a file in the %temp% directory

Launching a process

Сreating synchronization primitives

Unauthorized injection to a system process

Verdict:

Likely Malicious

Threat level:

7.5/10

Confidence:

100%

Tags:

autoit compiled-script fingerprint lolbin masquerade microsoft_visual_cc msconfig packed packed packed threat upx

Link:

https://www.filescan.io/uploads/68a68be4419c816a6e8e49d7/reports/62e0104f-d208-42b0-b7ec-66e4cb5276ac/overview

Verdict:

Malicious

Labled as:

AIT:Trojan.Nymeria.7481;AIT:Trojan.Nymeria

Link:

https://www.hybrid-analysis.com/sample/1336a81d27c381bfaefd7d763b6c93d593f9c181fe97522b8248d520c6b0e2ff

Malware family:

Formbook

Verdict:

Malicious

Link:

https://analyze.intezer.com/analyses/289f05c6-a586-409b-a6fc-aa63073157e5

Result

Threat name:

FormBook

Detection:

malicious

Classification:

troj.spyw.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1761773

Signature

Binary is likely a compiled AutoIt script file

Found API chain indicative of sandbox detection

Found direct / indirect Syscall (likely to bypass EDR)

Initial sample is a PE file and has a suspicious name

Joe Sandbox ML detected suspicious sample

Maps a DLL or memory area into another process

Multi AV Scanner detection for submitted file

Queues an APC in another process (thread injection)

Suricata IDS alerts for network traffic

Switches to a custom stack to bypass stack traces

Tries to harvest and steal browser information (history, passwords, etc)

Tries to steal Mail credentials (via file / registry access)

Writes to foreign memory regions

Yara detected FormBook

Behaviour

Behavior Graph:

Download SVG

Score:

100%

Verdict:

Malware

File Type:

Link:

https://malprob.io/report/1336a81d27c381bfaefd7d763b6c93d593f9c181fe97522b8248d520c6b0e2ff

Verdict:

Malware

YARA:

5 match(es)

Tags:

AutoIt Decompiled Executable PE (Portable Executable) PE File Layout Suspect Win 32 Exe x86

Link:

https://app.malva.re/file/d525479c1ec52ea1ff3429c90f3791f9

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/1336a81d27c381bfaefd7d763b6c93d593f9c181fe97522b8248d520c6b0e2ff/

Threat name:

Win32.Trojan.AutoitInject

Status:

Malicious

First seen:

2025-08-21 01:08:54 UTC

File Type:

PE (Exe)

Extracted files:

AV detection:

29 of 38 (76.32%)

Threat level:

5/5

Detection(s):

Malicious file

Link:

https://check.spamhaus.org/check/?searchterm=cm3kqhjhyoa37lx5pv3dw3et2wj7tqmb72lvek4cjdksbrvq4l7q._file

Result

Malware family:

formbook

Score:

10/10

Tags:

family:formbook discovery rat spyware stealer trojan upx

Link:

https://tria.ge/reports/250821-dhs9xael4z/

Behaviour

Suspicious behavior: EnumeratesProcesses

Suspicious behavior: MapViewOfSection

Suspicious use of FindShellTrayWindow

Suspicious use of SendNotifyMessage

Suspicious use of WriteProcessMemory

System Location Discovery: System Language Discovery

AutoIT Executable

Suspicious use of SetThreadContext

UPX packed file

Formbook payload

Formbook

Formbook family

Verdict:

Suspicious

Tags:

n/a

YARA:

n/a

Link:

https://app.threat.zone/submission/117ff003-b935-417b-89e6-ffcb1dfc4efe

Unpacked files

SH256 hash:

1336a81d27c381bfaefd7d763b6c93d593f9c181fe97522b8248d520c6b0e2ff

MD5 hash:

d525479c1ec52ea1ff3429c90f3791f9

SHA1 hash:

98bc9e05c63dd6577a46d56bda0eaafcba7c8786

Link:

https://www.unpac.me/results/5a26c624-5ff8-4974-a68f-dda5286acf58/

SH256 hash:

a1be3e0c2e3d45ae087019a8f0c95fbae97c7b16cf7eb38b41fa1586e06cb82e

MD5 hash:

a7bef26637dbeee76f6c02de239b10d0

SHA1 hash:

3ad9c8f4ac61ac4b1ce055a30b4a5062c8004c7d

Detections:

AutoIT_Compiled

Link:

https://www.unpac.me/results/5a26c624-5ff8-4974-a68f-dda5286acf58/

SH256 hash:

5d31ec0aa930c24d9b515d17f48bfba4322a9bacbf3552a163ddf688413d8bc1

MD5 hash:

438411203f6344cf48bf029ce8ea9942

SHA1 hash:

951b8654b4fbd371391fbd2534309d43d8066fb5

Link:

https://www.unpac.me/results/5a26c624-5ff8-4974-a68f-dda5286acf58/

SH256 hash:

3efa4d798f7a914986423aeae01f4605d2456bd184aeabd574e06bc933d069dc

MD5 hash:

c856388dd3d52aaec1e12f315d661239

SHA1 hash:

3b0b03a6d47bc24c3816ad703cc029283997c0d3

Detections:

win_formbook_g0

Link:

https://www.unpac.me/results/5a26c624-5ff8-4974-a68f-dda5286acf58/

Parent samples :

af6376d7d5de38d0d7acf754db0d4c4f77ba49a48eb1cb4d240b16d3725d58dc
1336a81d27c381bfaefd7d763b6c93d593f9c181fe97522b8248d520c6b0e2ff
d877bae199bbc7c645d879095e9b1eae36fd04bda4c49ba47bb15a9d216cc5e6
9307cae648af713f22ed1e089eaa4df908d0fcd582fc681d777a4fe61e30e283
061e7c16799ad41c3ca701ec1f4d06c7ad0c1c44e4c9bf4a57fd6eddb2ffa923
c0e5dfeb1cd2fe37c7fd82456e5f8a61998861c4de7764f820bed31290599dd4
800bd73ca92a135c6484e12e92ea1ed0ad33d33a01228e9ad23b0062d6a57024
29b52ea1de3a9d2e291aa46c8a603621a05cfa96d72462d1a235d0c6b7948257
10fe23a76875727b473cf13c70a08596bd5d1c9bf9e571b16775e27229802c22
a422d6ce2f3c8376411decfba73a28fbaaed1eefd5ce12d4d6f62afb3d03915b
a0f03b781a6132d96dd86b61922cb734aa80b135d2e1551d45496117eb7d1b65
04192a8beaa2f78a1c4ab5764134930e49fe58b202f7ea99a2421809a12acee2
f911f79f6ccaeb8891449b839a13d1775f210183778c25c77787db52bf638cfb
d68774cf28e7f7a8a574c3b983a339c0bd77810dc9874e90810ccf13739efbdc
e8ac0f1c567b0f90ebd42d248f3b9aad0afe8c0e2ee927b5a1cec88fa61eda56
a3701fb120b8bf03636784197b6584ed43b3a18215b27b4c8d85b0ee5f415bf7

Malware family:

FormBook

Verdict:

Malicious

Link:

https://www.vmray.com/analyses/_mb/1336a81d27c3/report/overview.html

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

Threat name:

Malicious File

Score:

0.94

Link:

https://yomi.yoroi.company/submissions/1336a81d27c381bfaefd7d763b6c93d593f9c181fe97522b8248d520c6b0e2ff

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:	Sus_Obf_Enc_Spoof_Hide_PE Create hunting rule
Author:	XiAnzheng
Description:	Check for Overlay, Obfuscating, Encrypting, Spoofing, Hiding, or Entropy Technique(can create FP)

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

Rule name:	upx_largefile Create hunting rule
Author:	k3nr9

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

exe 1336a81d27c381bfaefd7d763b6c93d593f9c181fe97522b8248d520c6b0e2ff

(this sample)

Delivery method

Distributed via e-mail attachment

Cape

https://www.capesandbox.com/analysis/22646/

BLint

The following table provides more information about this file using BLint. BLint is a Binary Linter to check the security properties, and capabilities in executables.

Findings

ID	Title	Severity
CHECK_AUTHENTICODE	Missing Authenticode	high
CHECK_DLL_CHARACTERISTICS	Missing dll Security Characteristics (HIGH_ENTROPY_VA)	high
CHECK_NX	Missing Non-Executable Memory Protection	critical

Reviews

ID	Capabilities	Evidence
AUTH_API	Manipulates User Authorization	ADVAPI32.dll::GetAce
MULTIMEDIA_API	Can Play Multimedia	WINMM.dll::timeGetTime
WIN_BASE_API	Uses Win Base API	KERNEL32.DLL::LoadLibraryA

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