MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 40f66f55c4faa23570b8b288dc1d9e59f7c2405725581a523931a9f3d9d8fcab. 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

Intelligence 10 IOCs YARA 21 File information Comments

SHA256 hash:	40f66f55c4faa23570b8b288dc1d9e59f7c2405725581a523931a9f3d9d8fcab
SHA3-384 hash:	349cd6785a97406546940bcc0d0ca3a0aff42297e931e27ed56191f167bd3ebf72db81ff7d8395cc3e95749ab8d4fdc7
SHA1 hash:	26cdafbf5c2efb606d5b92358b322e576debd0a1
MD5 hash:	74071c62962498e648e6b59c211149e9
humanhash:	charlie-white-blossom-alpha
File name:	thông báo hàng đến Awb#_82879440291.exe
Download:	download sample
Signature	Formbook Create hunting rule
File size:	1'153'536 bytes
First seen:	2023-11-20 07:06:24 UTC
Last seen:	Never
File type:	exe
MIME type:	application/x-dosexec
imphash	f34d5f2d4577ed6d9ceec516c1f5a744 (48'666 x AgentTesla, 19'479 x Formbook, 12'208 x SnakeKeylogger)
ssdeep	24576:TTlE8npgWh/FUAmSxo4WA4Y8AhoFnN8iIgm8zL2ePkj:FE8nyWLNKnY8/T13m8zL2ePU
TLSH	T1A735273C2B9A0667FC79C3E6DBD09127B6A1AAE7B119DD24D8D213C65702B0275C423F
TrID	63.0% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13) 11.2% (.SCR) Windows screen saver (13097/50/3) 9.0% (.EXE) Win64 Executable (generic) (10523/12/4) 5.6% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2) 3.8% (.EXE) Win32 Executable (generic) (4505/5/1)
Reporter	lowmal3
Tags:	exe FormBook

Intelligence

File Origin

# of uploads :

# of downloads :

294

Origin country :

Vendor Threat Intelligence

Detection(s):

SecuriteInfo.com.Trojan.Inject4.59820.6536.7273.UNOFFICIAL

Result

Verdict:

Malware

Maliciousness:

Behaviour

Creating a window

Sending a custom TCP request

Searching for synchronization primitives

Launching the default Windows debugger (dwwin.exe)

Searching for the window

Verdict:

Malicious

Labled as:

Win/malicious_confidence_100%

Link:

https://www.hybrid-analysis.com/sample/40f66f55c4faa23570b8b288dc1d9e59f7c2405725581a523931a9f3d9d8fcab

Result

Verdict:

MALICIOUS

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

Link:

https://analyze.intezer.com/analyses/59ba88fb-2526-4c9d-a631-ae95bc7334d1

Result

Threat name:

FormBook

Detection:

malicious

Classification:

troj.evad

Score:

88 / 100

Link:

https://www.joesandbox.com/analysis/1344981

Signature

.NET source code contains method to dynamically call methods (often used by packers)

.NET source code contains potential unpacker

.NET source code contains very large strings

Machine Learning detection for sample

Malicious sample detected (through community Yara rule)

Multi AV Scanner detection for submitted file

Yara detected AntiVM3

Yara detected FormBook

Behaviour

Behavior Graph:

Download SVG

Score:

100%

Verdict:

Malware

File Type:

Link:

https://malprob.io/report/40f66f55c4faa23570b8b288dc1d9e59f7c2405725581a523931a9f3d9d8fcab

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/40f66f55c4faa23570b8b288dc1d9e59f7c2405725581a523931a9f3d9d8fcab/

Threat name:

ByteCode-MSIL.Trojan.AgentTesla

Status:

Malicious

First seen:

2023-11-17 03:31:30 UTC

File Type:

PE (.Net Exe)

Extracted files:

AV detection:

21 of 38 (55.26%)

Threat level:

5/5

Detection(s):

Malicious file

Link:

https://check.spamhaus.org/check/?searchterm=id3g6voe7krdk4fywkenyhm6lh34eqcxevmbuurzggu7hwoy7svq._file

Verdict:

malicious

Label(s):

formbook

agenttesla

Result

Malware family:

n/a

Score:

3/10

Tags:

n/a

Link:

https://tria.ge/reports/231120-hxnp7afa9z/

Behaviour

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Program crash

Unpacked files

SH256 hash:

7de29da364a46b05ef35fb365ec282cec7da83bc81507e370c060a9564819b22

MD5 hash:

9fecf91bb56a1e1d90e2c74508690d0b

SHA1 hash:

777e6de3498c13fb526bbaa03a6405e1eca1841d

Link:

https://www.unpac.me/results/c72973c4-0a90-4111-b762-1a033d4902a0/

SH256 hash:

d05893b7f6f8e80de00ec14432669d61fcc0e3e84d1a8235e6c9207a2fecc650

MD5 hash:

5fbe5d27b6cbcb98066b83b977bcf634

SHA1 hash:

bfe5828699cc8d7b30f878dfbc3c3d803b9ef138

Link:

https://www.unpac.me/results/c72973c4-0a90-4111-b762-1a033d4902a0/

SH256 hash:

d01f3dea3851602ba5a0586c60430d286adf6fcc7e17aab080601a66630606e5

MD5 hash:

579197d4f760148a9482d1ebde113259

SHA1 hash:

cf6924eb360c7e5a117323bebcb6ee02d2aec86d

Link:

https://www.unpac.me/results/c72973c4-0a90-4111-b762-1a033d4902a0/

SH256 hash:

76482f1dc9b0639dd6b2d762e09101875e207e8c60e146a43ca182a4c13d6afa

MD5 hash:

9561bc00330bfa400784c1b3b2075d0b

SHA1 hash:

b98f0014f428085dea5ea44108d64d9119e3d698

Link:

https://www.unpac.me/results/c72973c4-0a90-4111-b762-1a033d4902a0/

SH256 hash:

7265b2d204666d92d46f5f514408a62679785e07b875f7aa2217b6c2309cb5f5

MD5 hash:

7c3265470e94e0945b738b7adb039e8d

SHA1 hash:

3dbdf3418371b33359becebfe05ade4b9e01148a

Link:

https://www.unpac.me/results/c72973c4-0a90-4111-b762-1a033d4902a0/

SH256 hash:

40f66f55c4faa23570b8b288dc1d9e59f7c2405725581a523931a9f3d9d8fcab

MD5 hash:

74071c62962498e648e6b59c211149e9

SHA1 hash:

26cdafbf5c2efb606d5b92358b322e576debd0a1

Link:

https://www.unpac.me/results/c72973c4-0a90-4111-b762-1a033d4902a0/

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/40f66f55c4faa23570b8b288dc1d9e59f7c2405725581a523931a9f3d9d8fcab

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

Rule name:	maldoc_find_kernel32_base_method_1 Create hunting rule
Author:	Didier Stevens (https://DidierStevens.com)

Rule name:	maldoc_getEIP_method_1 Create hunting rule
Author:	Didier Stevens (https://DidierStevens.com)

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

Rule name:	meth_get_eip Create hunting rule
Author:	Willi Ballenthin

Rule name:	meth_stackstrings Create hunting rule
Author:	Willi Ballenthin

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

Rule name:	pe_imphash 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:	Skystars_Malware_Imphash Create hunting rule
Author:	Skystars LightDefender
Description:	imphash

Rule name:	Windows_Trojan_Formbook Create hunting rule
Author:	@malgamy12

Rule name:	Windows_Trojan_Formbook_1112e116 Create hunting rule
Author:	Elastic Security

Rule name:	win_formbook_w0 Create hunting rule
Author:	@malgamy12

File information

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

Malspam

Formbook

exe 40f66f55c4faa23570b8b288dc1d9e59f7c2405725581a523931a9f3d9d8fcab

(this sample)

Delivery method

Distributed via e-mail attachment

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