MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 81636a7a80f724208563efc323ddcda8088ee050c4d4bf926ffb6374ff0ebf20. 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 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 81636a7a80f724208563efc323ddcda8088ee050c4d4bf926ffb6374ff0ebf20
SHA3-384 hash: e7ac316c05ed164326cada2b80c163704594f0023d0f01c536d354296c44f19f8b6dd789490a897190e91f3f74f6739d
SHA1 hash: 3c81444ac38ea750535b24a807cf84ffa61c1fd8
MD5 hash: 59c774c999cfff9f61442e581c87d520
humanhash: maine-fruit-asparagus-victor
File name:PO 38836353_pdf.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:449'024 bytes
First seen:2020-08-05 08:38:13 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'753 x AgentTesla, 19'660 x Formbook, 12'250 x SnakeKeylogger)
ssdeep 6144:hHAgbCa8sGQTSeOywrWlFH/+EENbiVaHSUHnZQE6gB:hHX8kTSeOywqFf+ECLL6gB
Threatray 5'130 similar samples on MalwareBazaar
TLSH 5EA47C3A3843C038C5391A74E0B95AD3AA383A793B54861F7396134C5F536AB7B1726F
Reporter abuse_ch
Tags:exe FormBook


Avatar
abuse_ch
Malspam distributing Formbook:

HELO: xa0.06.msllownpl.cf
Sending IP: 161.35.80.81
From: Joanny Vento <sales@buchi.com>
Subject: Re: New PO
Attachment: PO 38836353_pdf.img (contains "PO 38836353_pdf.exe")

Intelligence

File Origin
# of uploads :
1
# of downloads :
73
Origin country :
n/a
Vendor Threat Intelligence
Detection:
Formbook
Create hunting rule
Link:
https://www.capesandbox.com/analysis/39232/
Detection(s):
Sanesecurity.Malware.25544.7zHeur.UNOFFICIAL
Create hunting rule

Win.Malware.Formbook-7399661-0
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Sending a UDP request
Creating a file in the %temp% directory
Creating a process from a recently created file
Creating a file
Launching a process
Launching cmd.exe command interpreter
Unauthorized injection to a recently created process
Unauthorized injection to a recently created process by context flags manipulation
Unauthorized injection to a system process
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/410611
Signature
.NET source code contains very large array initializations
Allocates memory in foreign processes
Initial sample is a PE file and has a suspicious name
Injects a PE file into a foreign processes
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)
Modifies the prolog of user mode functions (user mode inline hooks)
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Sigma detected: Suspicious Svchost Process
System process connects to network (likely due to code injection or exploit)
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: 257575 Sample: PO 38836353_pdf.exe Startdate: 05/08/2020 Architecture: WINDOWS Score: 100 36 Malicious sample detected (through community Yara rule) 2->36 38 Yara detected FormBook 2->38 40 .NET source code contains very large array initializations 2->40 42 4 other signatures 2->42 10 PO 38836353_pdf.exe 4 2->10         started        process3 file4 30 C:\Users\user\AppData\...\AddInProcess32.exe, PE32 10->30 dropped 32 C:\Users\user\...\PO 38836353_pdf.exe.log, ASCII 10->32 dropped 52 Writes to foreign memory regions 10->52 54 Allocates memory in foreign processes 10->54 56 Injects a PE file into a foreign processes 10->56 14 AddInProcess32.exe 10->14         started        signatures5 process6 signatures7 58 Modifies the context of a thread in another process (thread injection) 14->58 60 Maps a DLL or memory area into another process 14->60 62 Sample uses process hollowing technique 14->62 64 2 other signatures 14->64 17 explorer.exe 14->17 injected process8 dnsIp9 34 www.xn--7rs79lgsf3ux.online 150.95.255.38, 49738, 80 INTERQGMOInternetIncJP Japan 17->34 44 System process connects to network (likely due to code injection or exploit) 17->44 21 svchost.exe 17->21         started        24 autofmt.exe 17->24         started        signatures10 process11 signatures12 46 Modifies the context of a thread in another process (thread injection) 21->46 48 Maps a DLL or memory area into another process 21->48 50 Tries to detect virtualization through RDTSC time measurements 21->50 26 cmd.exe 1 21->26         started        process13 process14 28 conhost.exe 26->28         started       
Detection:
formbook
Create hunting rule
Link:
https://mwdb.cert.pl/sample/81636a7a80f724208563efc323ddcda8088ee050c4d4bf926ffb6374ff0ebf20/
Threat name:
ByteCode-MSIL.Trojan.Kryptik
Create hunting rule
Status:
Malicious
First seen:
2020-08-05 08:40:07 UTC
AV detection:
24 of 29 (82.76%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=qfrwu6ua64scbbld57bshxonvaei5ycqytkl7etp7nrxj7yox4qa._file
Verdict:
malicious
Similar samples:
1b3a9b2b91e235e345e7ed4e944e219133eed160548fb27594e9493ad71785a6
Formbook
30bbf2043054b92e495bbd55f67e43b8eafce430bf31d8aaa4899385e503cdbe
Formbook
474cad642b1cf88f8d7f922cbfd9b8a00d7fc0eb40cafc0877007ee2884f105f
Formbook
487d192d19c37c9d4841141d3a41248b70400caa0cdcaed3d94ac7d4f3782222
Formbook
590fde182a154cd89b15d88546d60351b9fecb51e04fbbf4affd8d49a618bd23
Formbook
6b307cbe4f1e8d769af95142d574e77a50654e25cce234f48da6c5e7a7aa4b99
Formbook
6f827b68129d30609057c2e6b36be05649fce91d6bc8ee3d3566ca5c6aba562b
Formbook
6f95416c1006a499c7012c6cde49a27f83223c665cf9b28764030afeb04bf697
Formbook
b042e4bdfe19df2aa474fd5e2294aecc9a07d447c96466db7a7e20316d885634
Formbook
d3664113994262962936ebe74d0355986970def0cd0bcdcf088fe102047df9ba
Formbook
+ 5'120 additional samples on MalwareBazaar
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
rat family:formbook
Link:
https://tria.ge/reports/200805-9s21vlj3ts/
Behaviour
Formbook Payload
Formbook family
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Suspicious File
Score:
0.63
Link:
https://yomi.yoroi.company/submissions/81636a7a80f724208563efc323ddcda8088ee050c4d4bf926ffb6374ff0ebf20

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:Formbook
Create hunting rule
Author:JPCERT/CC Incident Response Group
Description:detect Formbook in memory
Reference:internal research
Rule name:win_formbook_auto
Create hunting rule
Author:Felix Bilstein - yara-signator at cocacoding dot com
Description:autogenerated rule brought to you by yara-signator

File information

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

Malspam

Formbook

img 4e61ea6dc464b7f388a90291db0f0ab7d1694fa2f37aaea965d7cd08e520d936

Formbook

Executable exe 81636a7a80f724208563efc323ddcda8088ee050c4d4bf926ffb6374ff0ebf20

(this sample)

  
Dropped by
MD5 af509a67b11c33c65a6df258fa1fcc2d
  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/39232/
  
Dropped by
SHA256 4e61ea6dc464b7f388a90291db0f0ab7d1694fa2f37aaea965d7cd08e520d936

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