MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 37fd7b8035bd49b8dfad405a793428dda8cbf623de0133818756d05a1191d8b7. 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: 16

Intelligence 16 IOCs YARA 19 File information Comments

SHA256 hash:	37fd7b8035bd49b8dfad405a793428dda8cbf623de0133818756d05a1191d8b7
SHA3-384 hash:	37333dbc0e75f26aff18c744b3397d102136a9480aaca00122813dd1fd1c7796d611802099d4e4a2221bbda0b754802a
SHA1 hash:	20007286f125b0f2dbd097000c1c3cd014372d1e
MD5 hash:	49e038fcffc683c025060ca5610e0ad3
humanhash:	fix-spaghetti-tennessee-purple
File name:	Invoice copy.pdf.exe
Download:	download sample
Signature	Formbook Create hunting rule
File size:	622'592 bytes
First seen:	2024-04-18 06:47:02 UTC
Last seen:	2024-04-18 07:25:45 UTC
File type:	exe
MIME type:	application/x-dosexec
imphash	f34d5f2d4577ed6d9ceec516c1f5a744 (48'652 x AgentTesla, 19'462 x Formbook, 12'204 x SnakeKeylogger)
ssdeep	12288:7WkV9mUBhIooC3jjSc6bun4f8vNN3JRSA/DGzf9JEMWI:7WkV9mGuqzjSc6bkzN5RL/Ub9
TLSH	T19CD4230C33FD85ABC36866FC9D3160AC03B8C68640D4E7F74EC569AE27C17AD5156A63
TrID	71.1% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13) 10.2% (.EXE) Win64 Executable (generic) (10523/12/4) 6.3% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2) 4.3% (.EXE) Win32 Executable (generic) (4504/4/1) 2.0% (.ICL) Windows Icons Library (generic) (2059/9)
File icon (PE):
dhash icon	70e4d8b8f8e8c470 (8 x AgentTesla, 4 x Formbook)
Reporter	cocaman
Tags:	exe FormBook INVOICE

Intelligence

File Origin

# of uploads :

# of downloads :

356

Origin country :

Vendor Threat Intelligence

Malware family:

formbook

ID:

File name:

37fd7b8035bd49b8dfad405a793428dda8cbf623de0133818756d05a1191d8b7.exe

Verdict:

Malicious activity

Analysis date:

2024-04-18 06:50:02 UTC

Tags:

formbook xloader stealer spyware

Link:

https://app.any.run/tasks/3a6f1866-8fe1-486c-bf07-3ebbb886e779

Note:

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

Result

Verdict:

Malware

Maliciousness:

Behaviour

Searching for the window

Creating a window

Сreating synchronization primitives

Creating a process with a hidden window

Launching a process

Creating a file

Launching cmd.exe command interpreter

Setting browser functions hooks

Forced shutdown of a system process

Adding an exclusion to Microsoft Defender

Unauthorized injection to a system process

Unauthorized injection to a browser process

Verdict:

Unknown

Link:

https://www.hybrid-analysis.com/sample/37fd7b8035bd49b8dfad405a793428dda8cbf623de0133818756d05a1191d8b7

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.

Malware family:

Formbook

Verdict:

Malicious

Link:

https://analyze.intezer.com/analyses/89775a41-0ae9-4fa2-acb0-60db2f600fac

Result

Threat name:

FormBook

Detection:

malicious

Classification:

troj.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1427825

Signature

.NET source code contains potential unpacker

.NET source code contains very large array initializations

Adds a directory exclusion to Windows Defender

Antivirus / Scanner detection for submitted sample

C2 URLs / IPs found in malware configuration

Found malware configuration

Initial sample is a PE file and has a suspicious name

Loading BitLocker PowerShell Module

Machine Learning detection for sample

Malicious sample detected (through community Yara rule)

Maps a DLL or memory area into another process

Modifies the context of a thread in another process (thread injection)

Multi AV Scanner detection for domain / URL

Multi AV Scanner detection for submitted file

Performs DNS queries to domains with low reputation

Queues an APC in another process (thread injection)

Sample uses process hollowing technique

Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet

Sigma detected: Suspicious Double Extension File Execution

Snort IDS alert for network traffic

System process connects to network (likely due to code injection or exploit)

Tries to detect virtualization through RDTSC time measurements

Uses an obfuscated file name to hide its real file extension (double extension)

Uses netsh to modify the Windows network and firewall settings

Yara detected AntiVM3

Yara detected FormBook

Behaviour

Behavior Graph:

Download SVG

Score:

100%

Verdict:

Malware

File Type:

Link:

https://malprob.io/report/37fd7b8035bd49b8dfad405a793428dda8cbf623de0133818756d05a1191d8b7

Detection:

formbook

Link:

https://mwdb.cert.pl/sample/37fd7b8035bd49b8dfad405a793428dda8cbf623de0133818756d05a1191d8b7/

Threat name:

ByteCode-MSIL.Trojan.Taskun

Status:

Malicious

First seen:

2024-04-18 01:59:07 UTC

File Type:

PE (.Net 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=g76xxabvxve3rx5nibnhsnbi3wumx5rd3yathamhk3ifuemr3c3q._file

Verdict:

malicious

Label(s):

formbook

Result

Malware family:

formbook

Score:

10/10

Tags:

family:formbook campaign:fs83 rat spyware stealer trojan

Link:

https://tria.ge/reports/240418-hj8s7sfc5v/

Behaviour

Suspicious behavior: EnumeratesProcesses

Suspicious behavior: MapViewOfSection

Suspicious use of AdjustPrivilegeToken

Suspicious use of UnmapMainImage

Suspicious use of WriteProcessMemory

Enumerates physical storage devices

Suspicious use of SetThreadContext

Checks computer location settings

Formbook payload

Formbook

Unpacked files

SH256 hash:

139f75b55ff904e5ccbc51d61c61de935274c66cfa38d9cb859461ea2216bd81

MD5 hash:

cdf453020c11d01891a06da4b1ec17d3

SHA1 hash:

27f91c5c7afdc57847d17f8274ce3b3ba96bbf8b

Detections:

FormBook

win_formbook_w0

win_formbook_auto

win_formbook_g0

Formbook

Link:

https://www.unpac.me/results/f02b5639-ccef-40ef-a410-193fbd1691b0/

Parent samples :

8ab205dc4d6f7c232cf9e2047a6abf4b2bb6425258cefeaf9b05e922c8229c6a
37fd7b8035bd49b8dfad405a793428dda8cbf623de0133818756d05a1191d8b7
e1fd783c3c5c3a686b2ae04b64ecce2b3c5e00d2bed04cdbf8f420a57d82208e
3fce144519b73bde4b30740ced6678a0aebcfcf00c7ff2ed6f78034cd5900f56
331ca91b3a643aab796547bdd69ecd624ab13ac224ea80f88ca4a8987c0625e3
eec2040b640e5b1806119e1a428d54c4dab8fe87e2afe89570d158968122e4bb

SH256 hash:

c06cf7dfe3fa645b3291dc61df2481863cc20b4feb0356bca1dcb0bf826f33a8

MD5 hash:

29e7c18fc2d270fa52d3f059c6fafbfb

SHA1 hash:

f8a60df4aa297c90c0c4c59a86c121630b6dd9c8

Link:

https://www.unpac.me/results/f02b5639-ccef-40ef-a410-193fbd1691b0/

SH256 hash:

1c633f39a192f108f755e0bcf412e8489ad80781f3b7807c80892deb2526ff0d

MD5 hash:

e4b5d57e9e46a4e76075b5b92f71577f

SHA1 hash:

d76dc165724148193c6911cc75fc62c198737d3a

Link:

https://www.unpac.me/results/f02b5639-ccef-40ef-a410-193fbd1691b0/

Parent samples :

d89ea6a01347b82f963ed7960583e5d76c6a07e91852fae83bc290e0f64a06b2
3f700fd41c6cca501d50cc2f62afd8e0d951efc1a918aa65ab3e84ee563ff1d6

SH256 hash:

e8d5a9219e8af1cf0ed3c2dffaeee22b38da4ea86d02502ea3e48e6da80dc40e

MD5 hash:

eb53f8b2ad757b9fdaaa04ccf238a125

SHA1 hash:

698712042011f2ee4c9a014912920c82b0a230d2

Link:

https://www.unpac.me/results/f02b5639-ccef-40ef-a410-193fbd1691b0/

SH256 hash:

37fd7b8035bd49b8dfad405a793428dda8cbf623de0133818756d05a1191d8b7

MD5 hash:

49e038fcffc683c025060ca5610e0ad3

SHA1 hash:

20007286f125b0f2dbd097000c1c3cd014372d1e

Link:

https://www.unpac.me/results/f02b5639-ccef-40ef-a410-193fbd1691b0/

Malware family:

FormBook

Verdict:

Malicious

Link:

https://www.vmray.com/analyses/_mb/37fd7b8035bd/report/overview.html

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

Threat name:

Malicious File

Score:

0.85

Link:

https://yomi.yoroi.company/submissions/37fd7b8035bd49b8dfad405a793428dda8cbf623de0133818756d05a1191d8b7

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:	cobalt_strike_tmp01925d3f Create hunting rule
Author:	The DFIR Report
Description:	files - file ~tmp01925d3f.exe
Reference:	https://thedfirreport.com

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

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

Rule name:	NETexecutableMicrosoft 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:	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

r00 f3298ef809962d972156b31709e10d4af7ab11c9ea3e2ce3412f052bf9784d26

Formbook

exe 37fd7b8035bd49b8dfad405a793428dda8cbf623de0133818756d05a1191d8b7

(this sample)

Delivery method

Other

Dropped by

SHA256 f3298ef809962d972156b31709e10d4af7ab11c9ea3e2ce3412f052bf9784d26

Dropped by

MD5 edf46e0240a7993d532633a83af664b6

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

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