MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b4a31239040deb4bf5f7fdf7219a2b8e9c1141131da634489e6e894a19a9255f. 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 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b4a31239040deb4bf5f7fdf7219a2b8e9c1141131da634489e6e894a19a9255f
SHA3-384 hash: 4f3069622534c46c1b6690d511c989624b10f8ec79bb57488ef294cb8abec96fcf25412d312d19e373016a098ec8d45c
SHA1 hash: 51aa4a6ff934b5e913562707748cfd530844b9b1
MD5 hash: 62f6611574881698664ecd291fdb4185
humanhash: muppet-black-blue-wolfram
File name:62f6611574881698664ecd291fdb4185.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:378'880 bytes
First seen:2022-05-12 07:32:10 UTC
Last seen:2022-05-12 08:57:30 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'744 x AgentTesla, 19'609 x Formbook, 12'242 x SnakeKeylogger)
ssdeep 1536:dNls63bJCWKdWuP/stH76Oj7zocFdV/dzMen+r93:L3bUWKdWuP/sB76OjftdQ3
TLSH T16E847364E7687C17CBE398F2BD81745CD41F8F88B7C04D0E9365BB1A34E299620D19AE
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) (4505/5/1)
2.0% (.EXE) Win16/32 Executable Delphi generic (2072/23)
File icon (PE):PE icon
dhash icon 86ccc6c2a28e8ed0 (2 x Matiex, 2 x LummaStealer, 1 x Formbook)
Reporter abuse_ch
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
2
# of downloads :
213
Origin country :
n/a
Vendor Threat Intelligence
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/269960/
Result
Verdict:
Malware
Maliciousness:

Behaviour
Сreating synchronization primitives
Launching a process
Creating a process with a hidden window
Sending an HTTP GET request
DNS request
Running batch commands
Creating a file in the %AppData% subdirectories
Creating a file
Searching for synchronization primitives
Reading critical registry keys
Launching cmd.exe command interpreter
Enabling autorun by creating a file
Unauthorized injection to a system process
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
obfuscated packed
Link:
https://www.filescan.io/uploads/627cb83c804c0977d3e4facf/reports/45fe4998-b054-43ef-8c00-21b224a1d5e8/overview
Result
Verdict:
UNKNOWN
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
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/c991c0d6-6bef-4956-b3ee-12093f67ed85
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/992619
Signature
.NET source code contains potential unpacker
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Creates an undocumented autostart registry key
Encrypted powershell cmdline option found
Found malware configuration
Injects a PE file into a foreign processes
Machine Learning detection for dropped file
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 dropped file
Multi AV Scanner detection for submitted file
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Snort IDS alert for network traffic
Tries to detect virtualization through RDTSC time measurements
Writes to foreign memory regions
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 625112 Sample: d4py7mJKrN.exe Startdate: 12/05/2022 Architecture: WINDOWS Score: 100 44 Snort IDS alert for network traffic 2->44 46 Multi AV Scanner detection for domain / URL 2->46 48 Found malware configuration 2->48 50 9 other signatures 2->50 9 d4py7mJKrN.exe 15 7 2->9         started        process3 dnsIp4 42 alexochemicals.cf 192.185.174.177, 49773, 80 UNIFIEDLAYER-AS-1US United States 9->42 36 C:\Users\user\AppData\...\Wvyjvexj.exe, PE32 9->36 dropped 38 C:\Users\...\Wvyjvexj.exe:Zone.Identifier, ASCII 9->38 dropped 40 C:\Users\user\AppData\...\d4py7mJKrN.exe.log, ASCII 9->40 dropped 54 Creates an undocumented autostart registry key 9->54 56 Encrypted powershell cmdline option found 9->56 58 Writes to foreign memory regions 9->58 60 Injects a PE file into a foreign processes 9->60 14 MSBuild.exe 9->14         started        17 cmd.exe 1 9->17         started        19 powershell.exe 15 9->19         started        file5 signatures6 process7 signatures8 62 Modifies the context of a thread in another process (thread injection) 14->62 64 Maps a DLL or memory area into another process 14->64 66 Sample uses process hollowing technique 14->66 68 2 other signatures 14->68 21 explorer.exe 14->21         started        24 explorer.exe 14->24 injected 26 conhost.exe 17->26         started        28 timeout.exe 1 17->28         started        30 conhost.exe 19->30         started        process9 signatures10 52 Tries to detect virtualization through RDTSC time measurements 21->52 32 cmd.exe 1 21->32         started        process11 process12 34 conhost.exe 32->34         started       
Detection:
formbook
Create hunting rule
Link:
https://mwdb.cert.pl/sample/b4a31239040deb4bf5f7fdf7219a2b8e9c1141131da634489e6e894a19a9255f/
Threat name:
ByteCode-MSIL.Downloader.PsDownload
Create hunting rule
Status:
Malicious
First seen:
2022-05-12 07:33:04 UTC
File Type:
PE (.Net Exe)
Extracted files:
14
AV detection:
21 of 26 (80.77%)
Threat level:
  3/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=wsrreoiebxvux5px7x3sdgrlr2obcqitdwtdise6n2euugnjevpq._file
Verdict:
malicious
Label(s):
formbook
Create hunting rule
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook campaign:s4s9 rat spyware stealer suricata trojan
Link:
https://tria.ge/reports/220512-jdhv9sdhck/
Behaviour
Delays execution with timeout.exe
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Program crash
Suspicious use of SetThreadContext
Checks computer location settings
Formbook Payload
Formbook
suricata: ET MALWARE FormBook CnC Checkin (GET)
Unpacked files
SH256 hash:
b4a31239040deb4bf5f7fdf7219a2b8e9c1141131da634489e6e894a19a9255f
MD5 hash:
62f6611574881698664ecd291fdb4185
SHA1 hash:
51aa4a6ff934b5e913562707748cfd530844b9b1
Link:
https://www.unpac.me/results/3dc9d88a-8623-4ee9-9910-e6b75194f625/
Malware family:
FormBook
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/b4a31239040d/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/b4a31239040deb4bf5f7fdf7219a2b8e9c1141131da634489e6e894a19a9255f

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:pe_imphash
Create hunting rule
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.

Web download

Formbook

Executable exe b4a31239040deb4bf5f7fdf7219a2b8e9c1141131da634489e6e894a19a9255f

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/2190691/
  
Delivery method
Distributed via web download
Cape
Cape
https://www.capesandbox.com/analysis/269960/

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