MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 a99bac1e728dc56860037cee42d2b3f22c50f987e10e010db92f29f88b6f8521. 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: a99bac1e728dc56860037cee42d2b3f22c50f987e10e010db92f29f88b6f8521
SHA3-384 hash: 1f6e060399d610d7737b76fd2875b192a78f77b12821a16d25ae71e9edac53636405f6cdd031e557fecd3d94fa13412c
SHA1 hash: 62d718de68d1dc23e2405c1298dfed0607b06378
MD5 hash: a5001f76ddb878e95ee9911c17b64ca2
humanhash: spring-cardinal-triple-april
File name:a99bac1e728dc56860037cee42d2b3f22c50f987e10e010db92f29f88b6f8521
Download: download sample
Signature Formbook
Create hunting rule
File size:285'696 bytes
First seen:2026-06-08 09:34:41 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
ssdeep 6144:ilqiSZRLVRANitpQ6ENjrSY0VtZOFn6xFTwUM8dKgtMXok:XiSXVaApJejrSY0e6/wUrkgtM
TLSH T17F5423CEEF1255B7E6510FF99A6A11871E3E89B4887CB347CB6A224971344D8890C7CF
TrID 34.1% (.EXE) Win64 Executable (generic) (6522/11/2)
23.5% (.EXE) Win32 Executable (generic) (4504/4/1)
10.7% (.ICL) Windows Icons Library (generic) (2059/9)
10.6% (.EXE) OS/2 Executable (generic) (2029/13)
10.4% (.EXE) Generic Win/DOS Executable (2002/3)
Magika pebin
Reporter adrian__luca
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
1
# of downloads :
57
Origin country :
HU HU
Vendor Threat Intelligence
No detections
Malware family:
n/a
ID:
1
File name:
a99bac1e728dc56860037cee42d2b3f22c50f987e10e010db92f29f88b6f8521.exe
Verdict:
No threats detected
Analysis date:
2026-06-08 09:46:11 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/dea064f0-5c8b-45b3-8f7f-d068c44c24f1

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
Formbook
Create hunting rule
Link:
https://www.capesandbox.com/analysis/69832/
Verdict:
Malicious
Score:
90.9%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6a268dc3ae2f98c00a68c924
Tags:
spawn
Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for synchronization primitives
Launching the default Windows debugger (dwwin.exe)
Launching a service
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
microsoft_visual_cc packed
Link:
https://www.filescan.io/uploads/6a268dd1554e843ff8640730/reports/09b7eda0-ec51-44cb-996b-dfe453e3389e/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Link:
https://www.hybrid-analysis.com/sample/a99bac1e728dc56860037cee42d2b3f22c50f987e10e010db92f29f88b6f8521
Verdict:
Malicious
File Type:
exe x32
First seen:
2026-04-21T06:06:00Z UTC
Last seen:
2026-04-27T23:25:00Z UTC
Hits:
~10
Detections:
Trojan-Spy.Win32.Noon.sb HEUR:Trojan-Spy.Win32.Noon.pef
Link:
https://opentip.kaspersky.com/a99bac1e728dc56860037cee42d2b3f22c50f987e10e010db92f29f88b6f8521/results?tab=lookup
Verdict:
Suspicious
Link:
https://analyze.intezer.com/analyses/6609213a-6e07-4829-a153-21270e11994b
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/a99bac1e728dc56860037cee42d2b3f22c50f987e10e010db92f29f88b6f8521
Gathering data
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/a99bac1e728dc56860037cee42d2b3f22c50f987e10e010db92f29f88b6f8521/
Verdict:
Malicious
Threat:
Family.FORMBOOK
Link:
https://tip.neiki.dev/file/a99bac1e728dc56860037cee42d2b3f22c50f987e10e010db92f29f88b6f8521
Threat name:
Win32.Backdoor.FormBook
Create hunting rule
Status:
Malicious
First seen:
2026-04-21 11:33:47 UTC
AV detection:
20 of 24 (83.33%)
Threat level:
  5/5
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook discovery rat spyware stealer trojan
Link:
https://tria.ge/reports/260608-llyykabv8n/
Behaviour
Suspicious behavior: EnumeratesProcesses
Program crash
System Location Discovery: System Language Discovery
Family: Formbook
Formbook payload
Unpacked files
SH256 hash:
a99bac1e728dc56860037cee42d2b3f22c50f987e10e010db92f29f88b6f8521
MD5 hash:
a5001f76ddb878e95ee9911c17b64ca2
SHA1 hash:
62d718de68d1dc23e2405c1298dfed0607b06378
Link:
https://www.unpac.me/results/c2ab9ef1-2c45-4cd4-9c9a-f19362d49fd4/
Malware family:
FormBook
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/a99bac1e728d/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.

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_no_import_table
Create hunting rule
Description:Detect pe file that no import table
Rule name:shellcode
Create hunting rule
Author:nex
Description:Matched shellcode byte patterns

File information

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

Cape
Cape
https://www.capesandbox.com/analysis/69832/

Comments