MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 c4b1b2d82beea8ab9cc8feb1ec2f47b645b3017280f7a8c752a939f96cfd323c. 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: 13


Intelligence 13 IOCs YARA 3 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: c4b1b2d82beea8ab9cc8feb1ec2f47b645b3017280f7a8c752a939f96cfd323c
SHA3-384 hash: e1955fb3a76a4c8d99b9ddd9fa26762b7a46fd35483365cb5a9d82d5d5b24dce8a6d287b15ba00e2e64e2b7206882d97
SHA1 hash: 27a7b50a2546632cbec807d130cd01d37f8d403e
MD5 hash: f37c7a7acdf7c5cc397e6931eca075f9
humanhash: tango-cold-nitrogen-one
File name:c4b1b2d82beea8ab9cc8feb1ec2f47b645b3017280f7a8c752a939f96cfd323c
Download: download sample
Signature Formbook
Create hunting rule
File size:1'088'512 bytes
First seen:2026-08-10 14:29:58 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (49'191 x AgentTesla, 20'339 x Formbook, 12'364 x SnakeKeylogger)
ssdeep 24576:Ud7GzDWmWpTQfY14a6X2LHxDlrqMYh4VKg0CjqoP4:BmNsfY1221lGo0/Cjq
TLSH T114351214A79BDA12D4650B72D9E2E2F503B28F14F613C2AF5ED9BED37A333960D50242
TrID 73.9% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
6.6% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
6.6% (.EXE) Win64 Executable (generic) (6522/11/2)
4.5% (.EXE) Win32 Executable (generic) (4504/4/1)
2.0% (.ICL) Windows Icons Library (generic) (2059/9)
Magika pebin
dhash icon 3e73715d4d5d7d23 (62 x Formbook)
Reporter adrian__luca
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
1
# of downloads :
56
Origin country :
HU HU
Vendor Threat Intelligence
Malware configuration found for:
NETReactor RoboSki
Details
Link:
https://research.acce.ciphertechsolutions.com/results/f4aaf465-165c-477a-b453-eb8b8054215d/
Detection:
Formbook
Create hunting rule
Link:
https://www.capesandbox.com/analysis/79899/
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Unauthorized injection to a recently created process
Restart of the analyzed sample
Creating a file
Searching for synchronization primitives
Launching the default Windows debugger (dwwin.exe)
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
entropy formbook net_reactor obfuscated packed packed vbnet
Link:
https://www.filescan.io/uploads/6a79e0cbc28463a7097ae099/reports/c8f35bc0-c568-4ee7-a1c7-ea90a5d2e24f/overview
Verdict:
Malicious
Labled as:
FormBook.Generic
Link:
https://www.hybrid-analysis.com/sample/c4b1b2d82beea8ab9cc8feb1ec2f47b645b3017280f7a8c752a939f96cfd323c
Verdict:
Malicious
File Type:
exe x32
First seen:
2026-07-17T00:17:00Z UTC
Last seen:
2026-08-11T07:42:00Z UTC
Hits:
~1000
Link:
https://opentip.kaspersky.com/c4b1b2d82beea8ab9cc8feb1ec2f47b645b3017280f7a8c752a939f96cfd323c/results?tab=lookup
Malware family:
Formbook
Create hunting rule
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/bfa58389-bf8b-4ec5-a3cb-df2d965ae980
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/c4b1b2d82beea8ab9cc8feb1ec2f47b645b3017280f7a8c752a939f96cfd323c
Gathering data
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/c4b1b2d82beea8ab9cc8feb1ec2f47b645b3017280f7a8c752a939f96cfd323c/
Threat name:
ByteCode-MSIL.Backdoor.FormBook
Create hunting rule
Status:
Malicious
First seen:
2026-07-17 12:21:43 UTC
File Type:
PE (.Net Exe)
Extracted files:
13
AV detection:
24 of 36 (66.67%)
Threat level:
  5/5
Verdict:
malicious
Label(s):
Formbook
Create hunting rule
Link:
https://reports.threatray.com/f42b4270-9a16-4576-8a2a-6fe6feb93457
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook discovery rat spyware stealer trojan
Link:
https://tria.ge/reports/260810-rvsqsswwcv/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious use of WriteProcessMemory
Program crash
System Location Discovery: System Language Discovery
SmartAssembly .NET packer
Suspicious use of SetThreadContext
Family: Formbook
Formbook payload
Unpacked files
SH256 hash:
c4b1b2d82beea8ab9cc8feb1ec2f47b645b3017280f7a8c752a939f96cfd323c
MD5 hash:
f37c7a7acdf7c5cc397e6931eca075f9
SHA1 hash:
27a7b50a2546632cbec807d130cd01d37f8d403e
Link:
https://www.unpac.me/results/71f27271-6c33-4961-8ecb-bfefc8e21ac7/
SH256 hash:
97c23fc04cedb4f6a978cb54fb734bb3cb6226cea7df86f12b222a9d946c86ef
MD5 hash:
2218509125c5d27dceaecada27190fce
SHA1 hash:
614d7515836b0a1eecc6ce9021f0bf03510ac55d
Link:
https://www.unpac.me/results/71f27271-6c33-4961-8ecb-bfefc8e21ac7/
SH256 hash:
281f0a31109ba3566ae24aad9d51a96464ffc1d21e36b6b6772663df2f0faac0
MD5 hash:
dde879de3fd7eb5674e79b43c6f5722d
SHA1 hash:
63a6adfa2f3d970779f8f77c69c9da620b52f3e4
Link:
https://www.unpac.me/results/71f27271-6c33-4961-8ecb-bfefc8e21ac7/
SH256 hash:
a65a99078aa8c118c04a0c04b3235bbe8db22ce42e71e79f1bb5981c24fefdd3
MD5 hash:
326ea8b8279cb171add7d5ec2955c743
SHA1 hash:
bd69eb0d8a12f7c3c6a4c55c7369b9d7af380fa3
Link:
https://www.unpac.me/results/71f27271-6c33-4961-8ecb-bfefc8e21ac7/
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/c4b1b2d82beea8ab9cc8feb1ec2f47b645b3017280f7a8c752a939f96cfd323c

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:NET
Create hunting rule
Author:malware-lu
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.

Cape
Cape
https://www.capesandbox.com/analysis/79899/

Comments