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MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b31bb9149cddcfcd91f2c39426c8d38e545678c272e97d7c28a34ba433ca05cf. 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 40 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b31bb9149cddcfcd91f2c39426c8d38e545678c272e97d7c28a34ba433ca05cf
SHA3-384 hash: 94935dda07b9255ee07e7cb60bb886226d8069460345386eec2e3bb97730e9fbdf1737f11833606e7f727cd490afa3ea
SHA1 hash: 25087c72ca9b82d49c3a7e98f448be22c0a031e2
MD5 hash: e0ad990828f6491f57219030b1c464c0
humanhash: fish-may-carpet-grey
File name:b31bb9149cddcfcd91f2c39426c8d38e545678c272e97d7c28a34ba433ca05cf
Download: download sample
Signature Formbook
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File size:920'064 bytes
First seen:2026-11-09 08:19:14 UTC
Last seen:Never
File type:Executable exe
MIME type:application/vnd.microsoft.portable-executable
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (49'350 x AgentTesla, 20'845 x Formbook, 12'417 x SnakeKeylogger)
ssdeep 24576:ie9Ei+8am5tSG5F4QdZOdig500pa0r68JTzMW:f85gtSSF5dZCa02mTzM
TLSH T12F15E1442269CA06C46A97F8D931E2F517F96EAAE820F3574ED57EEF3836F400D80653
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
Reporter adrian__luca
Tags:exe FormBook

Intelligence

File Origin
# of uploads :
1
# of downloads :
46
Origin country :
HU HU
Vendor Threat Intelligence
Malware configuration found for:
RoboSki
Details
Link:
https://research.acce.ciphertechsolutions.com/results/7e2dc6eb-3ab4-4b85-98bf-9450556944bd/
Detection:
Formbook
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Link:
https://www.capesandbox.com/analysis/98381/
Gathering data
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)
Blocking the Windows Defender launch
Adding an exclusion to Microsoft Defender
Gathering data
Verdict:
Malicious
Labled as:
Trojan.Generic
Link:
https://www.hybrid-analysis.com/sample/b31bb9149cddcfcd91f2c39426c8d38e545678c272e97d7c28a34ba433ca05cf
Verdict:
Malicious
File Type:
exe x32
First seen:
2026-10-15T21:17:00Z UTC
Last seen:
2026-10-30T11:27:00Z UTC
Hits:
~100
Link:
https://opentip.kaspersky.com/b31bb9149cddcfcd91f2c39426c8d38e545678c272e97d7c28a34ba433ca05cf/results?tab=lookup
Verdict:
Unknown
Link:
https://analyze.intezer.com/analyses/7a9e4b65-911a-42ba-be00-5328d5e732cb
Verdict:
inconclusive
YARA:
5 match(es)
Tags:
.Net Executable Managed .NET PE (Portable Executable) PE File Layout SOS: 0.37 Win 32 Exe x86
Link:
https://app.malva.re/file/e0ad990828f6491f57219030b1c464c0
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b31bb9149cddcfcd91f2c39426c8d38e545678c272e97d7c28a34ba433ca05cf/
Threat name:
ByteCode-MSIL.Backdoor.FormBook
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Status:
Malicious
First seen:
2026-10-17 02:27:20 UTC
File Type:
PE (.Net Exe)
Extracted files:
12
AV detection:
28 of 36 (77.78%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=wmn3sfe43xh43epsyokcnsgtrzkfm6gcolux27biunf2im6kaxhq._file
Result
Malware family:
formbook
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Score:
  10/10
Tags:
family:formbook discovery evasion execution rat spyware stealer trojan
Link:
https://tria.ge/reports/261109-j73grsaw7r/
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
Family: Formbook
Formbook payload
Modifies Windows Defender DisableAntiSpyware settings
Malware Family:
n/a
Verdict:
Malicious
Tags:
evasion injector
YARA:
n/a
Link:
https://app.threat.zone/submission/43cd33cd-5e06-402a-8180-e60372208c14
Malware Family:
msil
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Malicious:
True
Tags:
polymorphic dotnet peexe
Link:
https://intel.virussign.com/intelligence/file/b31bb9149cddcfcd91f2c39426c8d38e545678c272e97d7c28a34ba433ca05cf
Unpacked files
SH256 hash:
b31bb9149cddcfcd91f2c39426c8d38e545678c272e97d7c28a34ba433ca05cf
MD5 hash:
e0ad990828f6491f57219030b1c464c0
SHA1 hash:
25087c72ca9b82d49c3a7e98f448be22c0a031e2
Link:
https://www.unpac.me/results/c37ab419-1d43-496f-8db6-8eea0a7664ee/
SH256 hash:
27c88bad1b2c006c58fe2f4f06192cc6183d4b7b90361eed9c1feb991b6089b9
MD5 hash:
0861fa77f69145eefb3980b154ade96b
SHA1 hash:
e8f202cd2f3eb80de88e200abf5ca721637aed09
Link:
https://www.unpac.me/results/c37ab419-1d43-496f-8db6-8eea0a7664ee/
SH256 hash:
a191d02ea8e94d4e60af487303704e362981530ded0c3f0199f6c5878ce2d82e
MD5 hash:
6b2d7aa9fe4259cdc6380a57bb72c61b
SHA1 hash:
f8752ab25f83b609cd618b3c646a98b303b5badc
Link:
https://www.unpac.me/results/c37ab419-1d43-496f-8db6-8eea0a7664ee/
SH256 hash:
6d66fb055e77a64052f8c68f608930aff4ba0d80031148ee6b08071e024cd0f2
MD5 hash:
7d66f22984bfe5a9f2f9982f90c7215c
SHA1 hash:
ae9ffe37ed87098ea1708015717a694cc79a0e48
Link:
https://www.unpac.me/results/c37ab419-1d43-496f-8db6-8eea0a7664ee/
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/b31bb9149cddcfcd91f2c39426c8d38e545678c272e97d7c28a34ba433ca05cf

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:AgentTesla_DIFF_Common_Strings_01
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Author:schmidtsz
Description:Identify partial Agent Tesla strings
Rule name:CP_Script_Inject_Detector
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Author:DiegoAnalytics
Description:Detects attempts to inject code into another process across PE, ELF, Mach-O binaries
Rule name:data_manipulation
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Author:Serhii Kocherhan
Description:Detects data manipulation routines including XOR encoding, Base64 references, and RC4 PRGA encryption
Rule name:DebuggerCheck__GlobalFlags
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerCheck__QueryInfo
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerHiding__Active
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DebuggerHiding__Thread
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:DetectEncryptedVariants
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Author:Zinyth
Description:Detects 'encrypted' in ASCII, Unicode, base64, or hex-encoded
Rule name:dgaagas
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Author:Harshit
Description:Uses certutil.exe to download a file named test.txt
Rule name:DotNet_RGB_Embedded_AssemblyLoader_Hunt
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Author:ShadowOpCode
Description:Hunt .NET bitmap RGB extraction combined with embedded resources and assembly loading
Rule name:exploit_any_poppopret
Create hunting rule
Author:Jeff White [karttoon@gmail.com] @noottrak
Description:Identify POP -> POP -> RET opcodes for quick ROP Gadget creation in target binaries.
Rule name:golang_bin_JCorn_CSC846
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Author:Justin Cornwell
Description:CSC-846 Golang detection ruleset
Rule name:HUNT_NET_Loader_ImagePixel_To_AssemblyLoad
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Author:Anish Bogati
Description:Hunting: .NET loader that reads pixel data from an embedded image, loads it as a .NET assembly, and runs it via reflection or late binding. Catches bitmap-steganography loaders.
Rule name:MD5_Constants
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Author:phoul (@phoul)
Description:Look for MD5 constants
Rule name:NET
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Author:malware-lu
Rule name:NETexecutableMicrosoft
Create hunting rule
Author:malware-lu
Rule name:pe_imphash
Create hunting rule
Rule name:pe_no_import_table
Create hunting rule
Description:Detect pe file that no import table
Rule name:RIPEMD160_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for RIPEMD-160 constants
Rule name:SEH__vectored
Create hunting rule
Reference:https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara
Rule name:SHA1_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for SHA1 constants
Rule name:shellcode
Create hunting rule
Author:nex
Description:Matched shellcode byte patterns
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash
Rule name:TH_Win_ETW_Bypass_2025_CYFARE
Create hunting rule
Author:CYFARE
Description:Windows ETW Bypass Detection Rule - 2025
Reference:https://cyfare.net/
Rule name:VIGIA_njrat_060dd811
Create hunting rule
Author:VIG-IA - Cognitive Threat Intelligence System for Smart Territories and Tourism Sector
Description:njRAT protocol indicators with a corroborated original-sample signature
Reference:https://vigia.bisite.es/
Rule name:WIN_Malware_Derialock_ForgeAuto_3127f957_Extrait
Create hunting rule
Author:Marjoriefort
Description:Detects Derialock (pe, etat extrait)
Rule name:WIN_Malware_SalatStealer_ForgeAuto_542e717b
Create hunting rule
Author:Marjoriefort
Description:Detects SalatStealer (pe, etat binaire)
Rule name:WIN_Malware_Sliver_ForgeAuto_2ddb463c
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Author:Marjoriefort
Description:Detects Sliver (pe, etat binaire)
Rule name:WIN_Malware_Unknown_ForgeAuto_2ffc3572
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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_ce8c5b46
Create hunting rule
Author:Marjoriefort
Description:Detects Unknown (pe, etat binaire)
Rule name:WIN_Malware_ValleyRAT_ForgeAuto_401c5e16
Create hunting rule
Author:Marjoriefort
Description:Detects ValleyRAT (pe, etat binaire)
Rule name:WIN_Malware_XWorm_ForgeAuto_6b06c990_Extrait
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Author:Marjoriefort
Description:Detects XWorm (pe, etat extrait)
Rule name:WIN_Sample_Unique_69354b41
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Author:Marjoriefort
Description:Specimen unique (soumission Bazaar) - strings distinctifs propres au sample
Reference:69354b41e10daf03d3f3af881b32d5c0fec56b1cfe96629fd4c5263413a42854.exe

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/98381/

Comments