MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 c55443835b9da7ef3fd8e804969c806713c352c5fbdbe8e673e348f9588e7189. 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: 17


Intelligence 17 IOCs YARA 5 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: c55443835b9da7ef3fd8e804969c806713c352c5fbdbe8e673e348f9588e7189
SHA3-384 hash: 1a15154a3dc8c8f55db5112dd2279bcd6daa33641a09a70274edc5b3b9f942827902f7bec3e4bf2c4cc3fc183d92fd42
SHA1 hash: 1bc0918d8730eff0097f1edd8ff1a2b9c2150b36
MD5 hash: 8be0f7ff4d41c84caadd0ffc061b0e57
humanhash: three-undress-jersey-avocado
File name:INVOICE...exe
Download: download sample
Signature Formbook
Create hunting rule
File size:775'680 bytes
First seen:2025-09-29 06:59:46 UTC
Last seen:2025-10-06 10:39:59 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'666 x AgentTesla, 19'479 x Formbook, 12'209 x SnakeKeylogger)
ssdeep 12288:+3RvZLgQCzLQ99ss0S4OX9NN/1Hmd3CJVePuzp2VVLnWZDhGocmqNhH83bv09W8I:m1gQCzLQ99ss0pOXReSHzp2rWZcocrh6
Threatray 1'539 similar samples on MalwareBazaar
TLSH T180F4124CFB2E8F66C53C1B7FC4431648C1A74455F6B2F2DC4DCA58E60D2AB58D84AA8B
TrID 69.7% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
10.0% (.EXE) Win64 Executable (generic) (10522/11/4)
6.2% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
4.2% (.EXE) Win32 Executable (generic) (4504/4/1)
1.9% (.EXE) Win16/32 Executable Delphi generic (2072/23)
Magika pebin
Reporter adrian__luca
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
3
# of downloads :
104
Origin country :
HU HU
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
INVOICE...exe
Verdict:
No threats detected
Analysis date:
2025-09-29 07:47:43 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/20d4d649-276e-4f09-bb00-7caa005950d9

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/29374/
Verdict:
Malicious
Score:
93.3%
Link:
https://cyber-fortress.com/docs/result/index.php?id=68da2edff73d1046aa6acf84
Tags:
virus spawn shell
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Creating a process with a hidden window
Launching a process
Creating a file
Adding an exclusion to Microsoft Defender
Unauthorized injection to a system process
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
masquerade obfuscated obfuscated packed packed packer_detected vbnet
Link:
https://www.filescan.io/uploads/68da2fa174e5a28989979bf5/reports/29b6416d-75f7-44d9-bddd-cfea53600e7b/overview
Verdict:
Malicious
Labled as:
Win/malicious_confidence_100%
Link:
https://www.hybrid-analysis.com/sample/c55443835b9da7ef3fd8e804969c806713c352c5fbdbe8e673e348f9588e7189
Verdict:
Malicious
File Type:
exe x32
First seen:
2025-09-29T00:08:00Z UTC
Last seen:
2025-09-29T00:08:00Z UTC
Hits:
~1000
Detections:
VHO:Trojan-PSW.Win32.Stealer.gen PDM:Trojan.Win32.Generic Backdoor.Agent.HTTP.C&C Trojan-Spy.Win32.Noon.sb Trojan.MSIL.Inject.sb Trojan.MSIL.Crypt.sb Trojan-Spy.Noon.HTTP.ServerRequest HEUR:Trojan-Spy.MSIL.Noon.gen Trojan.MSIL.Taskun.sb
Link:
https://opentip.kaspersky.com/c55443835b9da7ef3fd8e804969c806713c352c5fbdbe8e673e348f9588e7189/results?tab=lookup
Verdict:
Malicious
Link:
https://analyze.intezer.com/analyses/d974d940-92e2-4610-9b79-1076aa5f97f7
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/c55443835b9da7ef3fd8e804969c806713c352c5fbdbe8e673e348f9588e7189
Verdict:
inconclusive
YARA:
10 match(es)
Tags:
.Net Executable Managed .NET PE (Portable Executable) PE File Layout SOS: 0.44 Win 32 Exe x86
Link:
https://app.malva.re/file/8be0f7ff4d41c84caadd0ffc061b0e57
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/c55443835b9da7ef3fd8e804969c806713c352c5fbdbe8e673e348f9588e7189/
Verdict:
Malicious
Threat:
Family.FORMBOOK
Link:
https://tip.neiki.dev/file/c55443835b9da7ef3fd8e804969c806713c352c5fbdbe8e673e348f9588e7189
Threat name:
Win32.Backdoor.FormBook
Create hunting rule
Status:
Malicious
First seen:
2025-09-29 03:37:10 UTC
File Type:
PE (.Net Exe)
Extracted files:
1
AV detection:
28 of 38 (73.68%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=yvkeha23twt66p6y5acjnheam4j4guwf7pn6rztt4nepsweoogeq._file
Verdict:
malicious
Label(s):
formbook
Create hunting rule
unc_loader_037
Create hunting rule
Similar samples:
0ef28af627a20a5be581f8dc7bff948415a909ad482ed18fdc4554902d20091f
Formbook
1608d1238888d30c34f6d72b2874de8fb543126eaa75973b1a75cba95094a973
Formbook
2dcb2fd846c048795d1a3d059ce923bd53e26373db8bd324ec9f4c213f730be1
Formbook
40900bdbfd55f8f206b3b6233c633f35109a6a390c0266eeb542aa939121c035
Formbook
424ae2948a4da9628f788e681957586c2d1e6ca1d4b615b8dd92a8930b5468d4
Formbook
89369898ebf3b91a1f28cecd38382b3f47d32e0cbde22543b1ece74c25c03eef
Formbook
99dcd9cd3a6d39ef105c199f464fb5d166f1c3cf0a699cb008aa9b4b75182b39
Formbook
cad1738a30123d36693ddb0531b3b0ac14d8f9eb577609b25905ab28c4e9a3eb
Formbook
error
Formbook
f7752fa3cc9f5fcdfc5f0346401907e77494ac55c6c133ee115986cd723ee164
Formbook
f94f36ad5e8746f9b9dd6a23e079d8d12f0e55d49a96c761cba4b9bbde734f04
Formbook
+ 1'529 additional samples on MalwareBazaar
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook discovery execution rat spyware stealer trojan
Link:
https://tria.ge/reports/250929-hwljfagm6v/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Suspicious use of SetThreadContext
Checks computer location settings
Command and Scripting Interpreter: PowerShell
Formbook payload
Formbook
Formbook family
Verdict:
Malicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/5c5231be-6211-48c5-b268-4d842ff82efd
Unpacked files
SH256 hash:
c55443835b9da7ef3fd8e804969c806713c352c5fbdbe8e673e348f9588e7189
MD5 hash:
8be0f7ff4d41c84caadd0ffc061b0e57
SHA1 hash:
1bc0918d8730eff0097f1edd8ff1a2b9c2150b36
Link:
https://www.unpac.me/results/28b50cc3-1472-4b6c-87fa-f67fa7ea302a/
SH256 hash:
889ec14703f1c17652244d66c857df1da8848da497651ba2d3308488b292a1a5
MD5 hash:
d5cde7b39c93212e3faa702e349c5e3f
SHA1 hash:
08f98762af837078675bbf6b2c540761b9dda162
Link:
https://www.unpac.me/results/28b50cc3-1472-4b6c-87fa-f67fa7ea302a/
SH256 hash:
e011d112398924d9de33327796d973ae648a448f5d8780907d6dc906981fb85b
MD5 hash:
56ff216192040fb06bbe48cc0d06c73f
SHA1 hash:
7bab495c1e5f6ce9a7d432b050a9cc834653a5f4
Detections:
SUSP_OBF_NET_ConfuserEx_Name_Pattern_Jan24
Create hunting rule
SUSP_OBF_NET_Reactor_Indicators_Jan24
Create hunting rule
Link:
https://www.unpac.me/results/28b50cc3-1472-4b6c-87fa-f67fa7ea302a/
SH256 hash:
f7b55edef63e49793f4bee5657464310562e2e5c9f4ad8d39764cc2bd4b8cbb1
MD5 hash:
666353f0798ebdf250512f14f7ce7a41
SHA1 hash:
8736db444e1c1a503b2f5346c6594b02584e5ddd
Link:
https://www.unpac.me/results/28b50cc3-1472-4b6c-87fa-f67fa7ea302a/
SH256 hash:
fae3fe1a1c49b3df491ce0db82f943afa346ddd580e9f61eda913fcc1c5a5b82
MD5 hash:
c17512299a56fc64e23fa3e1b35699df
SHA1 hash:
a7faee9c891d2004594a4e76df9232ac6af96bb5
Link:
https://www.unpac.me/results/28b50cc3-1472-4b6c-87fa-f67fa7ea302a/
Malware family:
FormBook
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/c55443835b9d/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/c55443835b9da7ef3fd8e804969c806713c352c5fbdbe8e673e348f9588e7189

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:CP_AllMal_Detector
Create hunting rule
Author:DiegoAnalytics
Description:CrossPlatform All Malwares Detector: Detect PE, ELF, Mach-O, scripts, archives; overlay, obfuscation, encryption, spoofing, hiding, high entropy, network communication
Rule name:NET
Create hunting rule
Author:malware-lu
Rule name:NETexecutableMicrosoft
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.

Malspam

Formbook

Executable exe c55443835b9da7ef3fd8e804969c806713c352c5fbdbe8e673e348f9588e7189

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/29374/

Comments