MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b25e43fe3f6068eb13b79f8900dea897533005aee7e2139e6676b7cdc92cc588. 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: b25e43fe3f6068eb13b79f8900dea897533005aee7e2139e6676b7cdc92cc588
SHA3-384 hash: 1a91cb68ce17b92401b711bc6c49efee9932e0f564a3430d84dff83f8ab3ccd005dfd33a82727163c4d37095e4b6d5af
SHA1 hash: dceb4cb62401f5e5c75971a97a9f6f1ad25f5148
MD5 hash: cbcdc236b81280bc56399245dad87195
humanhash: mississippi-georgia-equal-seven
File name:PO#994347.xls.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:907'776 bytes
First seen:2020-08-17 13:41:03 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'649 x AgentTesla, 19'461 x Formbook, 12'202 x SnakeKeylogger)
ssdeep 12288:ocS1QbvgWK5WpLslsYKPg1k4FGEE284t:qQbvxaWi/vCEEbm
Threatray 2'314 similar samples on MalwareBazaar
TLSH 24154EF933494C2EC4082F30EA9495F2F9275E04BA8C459A5E77AE885EDD05FB91813F
Reporter James_inthe_box
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
1
# of downloads :
63
Origin country :
n/a
Vendor Threat Intelligence
Detection:
Formbook
Create hunting rule
Link:
https://www.capesandbox.com/analysis/47020/
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Creating a file in the %temp% subdirectories
Sending a UDP request
Creating a file
Creating a process from a recently created file
Launching cmd.exe command interpreter
Setting browser functions hooks
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.spyw.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/433561
Signature
.NET source code contains very large array initializations
Allocates memory in foreign processes
Detected FormBook malware
Initial sample is a PE file and has a suspicious name
Injects a PE file into a foreign processes
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
System process connects to network (likely due to code injection or exploit)
Tries to detect virtualization through RDTSC time measurements
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Mail credentials (via file access)
Uses an obfuscated file name to hide its real file extension (double extension)
Writes to foreign memory regions
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 269132 Sample: PO#994347.xls.exe Startdate: 17/08/2020 Architecture: WINDOWS Score: 100 41 Malicious sample detected (through community Yara rule) 2->41 43 Yara detected FormBook 2->43 45 .NET source code contains very large array initializations 2->45 47 3 other signatures 2->47 10 PO#994347.xls.exe 6 2->10         started        process3 file4 33 C:\Users\user\AppData\...\AddInProcess32.exe, PE32 10->33 dropped 35 C:\Users\user\AppData\...\AgileDotNetRT.dll, PE32 10->35 dropped 59 Writes to foreign memory regions 10->59 61 Allocates memory in foreign processes 10->61 63 Tries to detect virtualization through RDTSC time measurements 10->63 65 Injects a PE file into a foreign processes 10->65 14 AddInProcess32.exe 10->14         started        signatures5 process6 signatures7 67 Modifies the context of a thread in another process (thread injection) 14->67 69 Maps a DLL or memory area into another process 14->69 71 Sample uses process hollowing technique 14->71 73 2 other signatures 14->73 17 explorer.exe 14->17 injected process8 dnsIp9 37 daruhane.com 93.89.224.161, 49734, 80 TR-FBSTR Turkey 17->37 39 www.daruhane.com 17->39 49 System process connects to network (likely due to code injection or exploit) 17->49 21 cmd.exe 1 17 17->21         started        signatures10 process11 file12 29 C:\Users\user\AppData\...\K7Rlogrv.ini, data 21->29 dropped 31 C:\Users\user\AppData\...\K7Rlogri.ini, data 21->31 dropped 51 Detected FormBook malware 21->51 53 Tries to steal Mail credentials (via file access) 21->53 55 Tries to harvest and steal browser information (history, passwords, etc) 21->55 57 3 other signatures 21->57 25 cmd.exe 1 21->25         started        signatures13 process14 process15 27 conhost.exe 25->27         started       
Detection:
formbook
Create hunting rule
Link:
https://mwdb.cert.pl/sample/b25e43fe3f6068eb13b79f8900dea897533005aee7e2139e6676b7cdc92cc588/
Threat name:
ByteCode-MSIL.Trojan.AgentTesla
Create hunting rule
Status:
Malicious
First seen:
2020-08-17 07:46:31 UTC
File Type:
PE (.Net Exe)
Extracted files:
15
AV detection:
22 of 29 (75.86%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=wjpeh7r7mbuowe5xt6eqbxvis5jtabno47rbhhtgo2343sjmywea._file
Verdict:
malicious
Similar samples:
0e7ba6c8acc0e3de5a31e050eb287daba683c992e12c4715730ef3ccf3bbf575
Formbook
3d8ff1b4492a541b44c03733b090c73fd992535d8c4e867abc0e6aeaf5b58b30
Formbook
415c22ceb1927b67c21bd55423f75713b29ca6950e806387e28abbbf19ccc8bd
Formbook
4fd6cfb4c08338e8b3a6ec64118aa6ad90350e865e90365b5b700aa41908b984
Formbook
8e2f9a1b23ade94b0803ea57ac92e916daad73d760f075fed8f1443715104531
Formbook
9295ce88660ed117b7cfff0886232a51dc6492bf6100738957bf93fabdb74bb8
Formbook
9d545cae8b73e11800aaf794b2919bb8972511e4e217eaf1a51c3f38c17bb412
Formbook
9e4dcaf1e587af9702c21677d6447f90eff8437573e8400a8668db31d7bc7c3e
Formbook
b3289e282e7c031fde98778bac0057bad5d933c85da0b43d95f177c6333fc3c2
Formbook
e04b0836667f55bcc1778c62761c99af52cb5c42c14cef3962531512def2944b
Formbook
+ 2'304 additional samples on MalwareBazaar
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
agilenet rat trojan spyware stealer family:formbook
Link:
https://tria.ge/reports/200817-y6czjjwq4e/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
Suspicious use of WriteProcessMemory
Suspicious use of SetThreadContext
Loads dropped DLL
Obfuscated with Agile.Net obfuscator
Executes dropped EXE
Formbook Payload
Formbook
Malware Config
C2 Extraction:
http://www.iskovlay.com/gdo/
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/b25e43fe3f6068eb13b79f8900dea897533005aee7e2139e6676b7cdc92cc588

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.

  
Delivery method
Other
Cape
Cape
https://www.capesandbox.com/analysis/47020/

Comments