MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 91dcef6c3b2c37efb32b7e00ef140ad7e176d8cffb3d16b1ce006bd1bb82b4b8. 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: 15


Intelligence 15 IOCs YARA 4 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 91dcef6c3b2c37efb32b7e00ef140ad7e176d8cffb3d16b1ce006bd1bb82b4b8
SHA3-384 hash: 5196c3c47f5e812509b19d2288c6d1a564bc2a68ef8249b69ed4ce5cb445843860bffceb9978649b48c3ace33e821ced
SHA1 hash: ab2e27557804a0913b53ceea8d5740c33c1b5a7a
MD5 hash: e74b662cdef8cbb7810df9c3d0743513
humanhash: alabama-saturn-triple-failed
File name:91dcef6c3b2c37efb32b7e00ef140ad7e176d8cffb3d16b1ce006bd1bb82b4b8
Download: download sample
Signature Formbook
Create hunting rule
File size:815'104 bytes
First seen:2025-10-09 14:31:00 UTC
Last seen:Never
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'740 x AgentTesla, 19'600 x Formbook, 12'241 x SnakeKeylogger)
ssdeep 24576:L4CYImX6dlll/eiYpoL2O3qIY001btoANmx:rqXalV6F0yX
TLSH T1A90501453719ED03D5B24AF448B1D3B50BB8BDAAA910D3C74EE6ACDB74F6F102A05683
TrID 71.1% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13)
10.2% (.EXE) Win64 Executable (generic) (10522/11/4)
6.3% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2)
4.3% (.EXE) Win32 Executable (generic) (4504/4/1)
2.0% (.ICL) Windows Icons Library (generic) (2059/9)
Magika pebin
Reporter adrian__luca
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
1
# of downloads :
66
Origin country :
HU HU
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
91dcef6c3b2c37efb32b7e00ef140ad7e176d8cffb3d16b1ce006bd1bb82b4b8
Verdict:
No threats detected
Analysis date:
2025-10-09 19:07:18 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/d02997e1-8bc0-4440-b058-664d4b1f4e5d

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/31554/
Verdict:
Malicious
Score:
99.1%
Link:
https://cyber-fortress.com/docs/result/index.php?id=68e7c8e2277c2bd8bc5e6940
Tags:
virus shell micro
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Creating a process with a hidden 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)
Adding an exclusion to Microsoft Defender
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
obfuscated packed packed packer_detected
Link:
https://www.filescan.io/uploads/68e7d641f377ab2310553a7e/reports/d275f9e8-d44d-4207-9f49-0def8472acf2/overview
Verdict:
Malicious
Labled as:
Trojan.Generic
Link:
https://www.hybrid-analysis.com/sample/91dcef6c3b2c37efb32b7e00ef140ad7e176d8cffb3d16b1ce006bd1bb82b4b8
Verdict:
Malicious
File Type:
exe x32
First seen:
2025-09-22T23:15:00Z UTC
Last seen:
2025-10-08T04:00:00Z UTC
Hits:
~1000
Link:
https://opentip.kaspersky.com/91dcef6c3b2c37efb32b7e00ef140ad7e176d8cffb3d16b1ce006bd1bb82b4b8/results?tab=lookup
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/398cabb1-a586-48b4-abb7-02c93a224a69
Score:
100%
Verdict:
Malware
File Type:
PE
Link:
https://malprob.io/report/91dcef6c3b2c37efb32b7e00ef140ad7e176d8cffb3d16b1ce006bd1bb82b4b8
Gathering data
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/91dcef6c3b2c37efb32b7e00ef140ad7e176d8cffb3d16b1ce006bd1bb82b4b8/
Threat name:
ByteCode-MSIL.Spyware.Negasteal
Create hunting rule
Status:
Malicious
First seen:
2025-09-23 02:14:55 UTC
File Type:
PE (.Net Exe)
Extracted files:
11
AV detection:
27 of 36 (75.00%)
Threat level:
  2/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=shoo63b3fq367mzlpyao6fak27qxnwgp7m6rnmooabv5do4cws4a._file
Verdict:
malicious
Label(s):
unc_loader_037
Create hunting rule
unc_loader_078
Create hunting rule
Similar samples:
error
Formbook
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook discovery execution rat spyware stealer trojan
Link:
https://tria.ge/reports/251009-s1qn3a1kx8/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Program crash
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/952cb54f-1538-4ced-a73d-cf719dac6bb1
Unpacked files
SH256 hash:
91dcef6c3b2c37efb32b7e00ef140ad7e176d8cffb3d16b1ce006bd1bb82b4b8
MD5 hash:
e74b662cdef8cbb7810df9c3d0743513
SHA1 hash:
ab2e27557804a0913b53ceea8d5740c33c1b5a7a
Link:
https://www.unpac.me/results/c3f23674-6511-4299-a196-0e6d36020841/
SH256 hash:
1041b538ccbc7d66e59247ef7551cde9b6c282843541585e9190a8e2e3943b12
MD5 hash:
e870d1e8f3791ccc141f85f40fd2972b
SHA1 hash:
150919ee289cffa6feb40ab8261f620dd7e26aac
Link:
https://www.unpac.me/results/c3f23674-6511-4299-a196-0e6d36020841/
SH256 hash:
ca1afbbdb25b54e0d4c07f9b84b0413f52a43b6cde98879ad8ab8f4af072cc61
MD5 hash:
08b7c02de115f6bd6949b9cf47164d4b
SHA1 hash:
9307c830cedc68bfba8f518954c07c352cc063bc
Link:
https://www.unpac.me/results/c3f23674-6511-4299-a196-0e6d36020841/
SH256 hash:
b9d5f1546523466dc8408138bc7f6c622cfba7ce8dde22fee64790e9f50290d0
MD5 hash:
03c001fe4b658b56c8671a507075b768
SHA1 hash:
e2e4131d66769191d600389ef91370f6db413dbd
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/c3f23674-6511-4299-a196-0e6d36020841/
SH256 hash:
c7f4a02dd8540aa58fd7d63f6853ee70f3e831933ff4d5b9d99b4c353fb75b58
MD5 hash:
28a0a198d1b0fa5b6a13a21391f449c0
SHA1 hash:
995ae682beeb2d06231524456faa237b1a83fd7d
Link:
https://www.unpac.me/results/c3f23674-6511-4299-a196-0e6d36020841/
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/91dcef6c3b2c37efb32b7e00ef140ad7e176d8cffb3d16b1ce006bd1bb82b4b8

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: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.

Cape
Cape
https://www.capesandbox.com/analysis/31554/

Comments