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MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 cf3657cfdbdd80eeb98a4dae53615227703e6ba3dd61f60f9a88b35e032df847. 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: 14


Intelligence 14 IOCs YARA 21 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: cf3657cfdbdd80eeb98a4dae53615227703e6ba3dd61f60f9a88b35e032df847
SHA3-384 hash: 2f80386ce02083855ed2b02fcc8cb0cb598a614387664847f38b1749d12d3fc2947be1481d55b6ea652765f547ead527
SHA1 hash: acb959c8f003298866ac11624b892be7505d8a0a
MD5 hash: 73672a669a8176a3cdf9c8177865b6aa
humanhash: arkansas-nebraska-seventeen-jupiter
File name:Heintjes.exe
Download: download sample
Signature Formbook
Create hunting rule
File size:841'832 bytes
First seen:2026-10-14 15:42:23 UTC
Last seen:Never
File type:Executable exe
MIME type:application/vnd.microsoft.portable-executable
imphash b34f154ec913d2d2c435cbd644e91687 (594 x GuLoader, 131 x RemcosRAT, 86 x EpsilonStealer)
ssdeep 12288:hTUYUaJr/kGOXKCw0V8WTECwS6MtJy3tw34rRKnXX57uPz/fSo8QJt5T5EtCciuv:hTUYUaKXRCWJwS6dAXX5iPDgQ5TgVi
TLSH T1AF05F1A037BADA4FD3B30A7852D263B1B5F8DD2A261B9707626376884D333E45385C71
TrID 50.3% (.EXE) Win32 Executable MS Visual C++ (generic) (31206/45/13)
10.6% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
10.5% (.EXE) Win64 Executable (generic) (6522/11/2)
8.1% (.EXE) Win16 NE executable (generic) (5038/12/1)
7.2% (.EXE) Win32 Executable (generic) (4504/4/1)
Magika pebin
Reporter TomU
Tags:exe FormBook signed

Code Signing Certificate

Organisation:Roomy
Issuer:Roomy
Algorithm:sha256WithRSAEncryption
Valid from:2026-10-01T03:00:42Z
Valid to:2027-10-01T03:00:42Z
Serial number: 4f9f0166608323abc2a749b884ee2bd8c320f3bf
Thumbprint Algorithm:SHA256
Thumbprint: 5d86455b35692e6fe5efd8ee04369361cd807ac222357c5b93f8f7d0b58b419c
Source:This information was brought to you by ReversingLabs A1000 Malware Analysis Platform

Intelligence

File Origin
# of uploads :
1
# of downloads :
111
Origin country :
CH CH
Vendor Threat Intelligence
Malware configuration found for:
GuLoader NSIS
Details
Link:
https://research.acce.ciphertechsolutions.com/results/73763077-024a-46e1-827f-7101406cf54b/
Malware family:
formbook
Create hunting rule
ID:
1
File name:
Rechnung.rar
Verdict:
Malicious activity
Analysis date:
2026-10-14 11:10:29 UTC
Tags:
arch-exec formbook xloader stealer
Link:
https://app.any.run/tasks/0462c49f-fc78-470e-920a-f406c23ecccf

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/91849/
Result
Verdict:
Suspicious
Maliciousness:

Behaviour
Creating a window
Creating a file
Searching for the window
Delayed reading of the file
Creating a file in the %temp% subdirectories
Unauthorized injection to a recently created process
Restart of the analyzed sample
DNS request
Connection attempt
Sending a custom TCP request
Sending an HTTP GET request
Sending an HTTP POST request
Creating synchronization primitives
Verdict:
Unknown
Threat level:
  2.5/10
Confidence:
100%
Tags:
adaptive-context anti-debug installer installer installer-heuristic microsoft_visual_cc nsis reconnaissance signed
Link:
https://www.filescan.io/uploads/6acfa31ad3bae837b818d95f/reports/59757c25-d429-49ad-8ddf-02bfcd333ab3/overview
Verdict:
Suspicious
Labled as:
VHO:Trojan.Makoob.gen
Link:
https://www.hybrid-analysis.com/sample/cf3657cfdbdd80eeb98a4dae53615227703e6ba3dd61f60f9a88b35e032df847
Verdict:
Malicious
File Type:
exe x32
First seen:
2026-10-14T07:36:00Z UTC
Last seen:
2026-10-15T03:47:00Z UTC
Hits:
~10
Link:
https://opentip.kaspersky.com/cf3657cfdbdd80eeb98a4dae53615227703e6ba3dd61f60f9a88b35e032df847/results?tab=lookup
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/85eca1fc-72a5-40c8-969b-1586924ba46e
Score:
95%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/cf3657cfdbdd80eeb98a4dae53615227703e6ba3dd61f60f9a88b35e032df847
Verdict:
inconclusive
YARA:
5 match(es)
Tags:
Executable NSIS Installer PE (Portable Executable) PE File Layout Win 32 Exe x86
Link:
https://app.malva.re/file/73672a669a8176a3cdf9c8177865b6aa
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/cf3657cfdbdd80eeb98a4dae53615227703e6ba3dd61f60f9a88b35e032df847/
Threat name:
Win32.Trojan.Kepavll
Create hunting rule
Status:
Malicious
First seen:
2026-10-14 14:54:31 UTC
File Type:
PE (Exe)
Extracted files:
16
AV detection:
13 of 22 (59.09%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=z43fpt633wao5omkjwxfgykse5yd425d3vq7md42rczv4azn7bdq._file
Verdict:
malicious
Label(s):
Formbook
Create hunting rule
Link:
https://reports.threatray.com/f14a650d-53d4-40aa-9f4c-9f03b4df8373
Result
Malware family:
guloader
Create hunting rule
Score:
  10/10
Tags:
family:guloader defense_evasion discovery downloader privilege_escalation
Link:
https://tria.ge/reports/261014-s5m4qsgg69/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Reads the TCP/IP host and domain name from the registry
System Location Discovery: System Language Discovery
Drops file in Program Files directory
Drops file in Windows directory
Suspicious use of NtCreateThreadExHideFromDebugger
Suspicious use of NtSetInformationThreadHideFromDebugger
Loads dropped DLL
Family: Guloader,Cloudeye
Unpacked files
SH256 hash:
cf3657cfdbdd80eeb98a4dae53615227703e6ba3dd61f60f9a88b35e032df847
MD5 hash:
73672a669a8176a3cdf9c8177865b6aa
SHA1 hash:
acb959c8f003298866ac11624b892be7505d8a0a
Link:
https://www.unpac.me/results/b3244e67-60c8-4ecd-9ec1-38162e791bf7/
SH256 hash:
a632d74332b3f08f834c732a103dafeb09a540823a2217ca7f49159755e8f1d7
MD5 hash:
75ed96254fbf894e42058062b4b4f0d1
SHA1 hash:
996503f1383b49021eb3427bc28d13b5bbd11977
Link:
https://www.unpac.me/results/b3244e67-60c8-4ecd-9ec1-38162e791bf7/
Malware family:
GuLoader
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/cf3657cfdbdd/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/cf3657cfdbdd80eeb98a4dae53615227703e6ba3dd61f60f9a88b35e032df847

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:DebuggerCheck__API
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DetectEncryptedVariants
Create hunting rule
Author:Zinyth
Description:Detects 'encrypted' in ASCII, Unicode, base64, or hex-encoded
Rule name:Detect_NSIS_Nullsoft_Installer
Create hunting rule
Author:Obscurity Labs LLC
Description:Detects NSIS installers by .ndata section + NSIS header string
Rule name:FormhookB
Create hunting rule
Author:kevoreilly
Description:Formbook Anti-hook Bypass
Rule name:golang_bin_JCorn_CSC846
Create hunting rule
Author:Justin Cornwell
Description:CSC-846 Golang detection ruleset
Rule name:NSIS
Create hunting rule
Author:kevoreilly
Description:NSIS Integrity Check function
Rule name:pe_detect_tls_callbacks
Create hunting rule
Rule name:PE_Digital_Certificate
Create hunting rule
Author:albertzsigovits
Rule name:Sus_CMD_Powershell_Usage
Create hunting rule
Author:XiAnzheng
Description:May Contain(Obfuscated or no) Powershell or CMD Command that can be abused by threat actor(can create FP)
Rule name:telebot_framework
Create hunting rule
Author:vietdx.mb
Rule name:TH_AntiVM_MassHunt_Win_Malware_2026_CYFARE
Create hunting rule
Author:CYFARE
Description:Detects Windows malware employing anti-VM / anti-sandbox evasion techniques across VMware, VirtualBox, Hyper-V, QEMU, Xen, and generic sandbox environments
Reference:https://cyfare.net/
Rule name:VECT_Ransomware
Create hunting rule
Author:Mustafa Bakhit
Description:Detects activity associated with VECT ransomware. This includes registry modifications and deletions, execution of system and defense-evasion commands, suspicious API usage, mutex creation, file and memory manipulation, ransomware note generation, anti-debugging and anti-analysis techniques, and embedded cryptographic constants (SHA256) characteristic of this malware family. Designed for threat intelligence and malware detection environments.
Rule name:Win_Clipboard_Clipper_Thengavar
Create hunting rule
Author:Thengavar
Description:Detects malware manipulating the Windows clipboard for clipping or crypto stealing attacks
Rule name:Win_FakeInstaller_PythonShellcodeLoader_Crepectl_2026
Create hunting rule
Author:SixHands
Description:Detects the analyzed fake installer sample using .key config, XOR key, and Python/fiber shellcode loader traits
Rule name:WIN_Malware_Unknown_ForgeAuto_1762e598_Extrait
Create hunting rule
Author:Marjoriefort
Description:Detects Unknown (pe, etat extrait)
Rule name:WIN_Malware_Unknown_ForgeAuto_2ffc3572
Create hunting rule
Author:Marjoriefort
Description:Detects Unknown (pe, etat binaire)
Rule name:WIN_Malware_Unknown_ForgeAuto_5001c94c
Create hunting rule
Author:Marjoriefort
Description:Detects Unknown (pe, etat binaire)
Rule name:WIN_Malware_Unknown_ForgeAuto_74566f98
Create hunting rule
Author:Marjoriefort
Description:Detects Unknown (pe, etat binaire)
Rule name:WIN_Malware_Unknown_ForgeAuto_79234c04
Create hunting rule
Author:Marjoriefort
Description:Detects Unknown (pe, etat binaire)
Rule name:WIN_Malware_Unknown_ForgeAuto_7e8e91c4
Create hunting rule
Author:Marjoriefort
Description:Detects Unknown (pe, etat binaire)
Rule name:WIN_Malware_Unknown_ForgeAuto_92a28498
Create hunting rule
Author:Marjoriefort
Description:Detects Unknown (pe, etat binaire)

File information

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

Malspam

Formbook

Executable exe cf3657cfdbdd80eeb98a4dae53615227703e6ba3dd61f60f9a88b35e032df847

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/91849/

Comments