MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 856d8419d52c0368f4aab3c196c8360dbbd4ba67c74d230bd7e0082b8f004f71. 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: 9


Intelligence 9 IOCs YARA 17 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 856d8419d52c0368f4aab3c196c8360dbbd4ba67c74d230bd7e0082b8f004f71
SHA3-384 hash: b3bba0de5475cdb0a04fc2ee260b4263f04f3324bc5ec0d2a2e4e46ba3a558c3d307729270c1bb69297af1d641bedd44
SHA1 hash: 831533fd379c6801b3d64cd88cd5f47e204cdda5
MD5 hash: 4a7b23d20ae2e24468e4f1070090cdc0
humanhash: uniform-floor-bacon-orange
File name:KMcrypted.ps1
Download: download sample
Signature Formbook
Create hunting rule
File size:2'276'236 bytes
First seen:2026-08-19 18:28:28 UTC
Last seen:Never
File type:PowerShell (PS) ps1
MIME type:text/plain
ssdeep 24576:fecvqylhZzATcN8Zu/pQNu5llHkuD/ueVIsdZ9TDl2XCgK1qWnwNSY26MvBVvj9y:E
TLSH T1ECB592BA0743F1AB973EC897AD96106C45F19B2AC45D50B020B9B53B2DE7D17C4CB88E
Magika powershell
Reporter abuse_ch
Tags:FormBook ps1

Intelligence

File Origin
# of uploads :
1
# of downloads :
59
Origin country :
SE SE
Vendor Threat Intelligence
No detections
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Tags:
aspnet_compiler base64 base64 encrypted evasive lolbin obfuscated reconnaissance
Link:
https://www.filescan.io/uploads/6a85f6066a7432e853710ef4/reports/17235e75-db87-4b96-80d4-88bf96a68ea0/overview
Verdict:
Malicious
Labled as:
PowerShell/Agent.EZS trojan
Link:
https://www.hybrid-analysis.com/sample/856d8419d52c0368f4aab3c196c8360dbbd4ba67c74d230bd7e0082b8f004f71
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1960688
Signature
.NET source code contains method to dynamically call methods (often used by packers)
.NET source code contains potential unpacker
Found direct / indirect Syscall (likely to bypass EDR)
Injects a PE file into a foreign processes
Joe Sandbox ML detected suspicious sample
Malicious sample detected (through community Yara rule)
Maps a DLL or memory area into another process
Modifies the context of a thread in another process (thread injection)
Multi AV Scanner detection for submitted file
Queues an APC in another process (thread injection)
Switches to a custom stack to bypass stack traces
Unusual module load detection (module proxying)
Writes to foreign memory regions
Yara detected FormBook
Yara detected Powershell decode and execute
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 1960688 Sample: KMcrypted.ps1 Startdate: 19/08/2026 Architecture: WINDOWS Score: 100 38 Malicious sample detected (through community Yara rule) 2->38 40 Multi AV Scanner detection for submitted file 2->40 42 Yara detected FormBook 2->42 44 4 other signatures 2->44 9 powershell.exe 20 2->9         started        process3 signatures4 46 Writes to foreign memory regions 9->46 48 Injects a PE file into a foreign processes 9->48 12 aspnet_compiler.exe 9->12         started        15 aspnet_compiler.exe 9->15         started        17 aspnet_compiler.exe 9->17         started        19 24 other processes 9->19 process5 signatures6 58 Modifies the context of a thread in another process (thread injection) 12->58 60 Maps a DLL or memory area into another process 12->60 62 Queues an APC in another process (thread injection) 12->62 21 5rQVaL7Z.exe 12->21 injected 64 Found direct / indirect Syscall (likely to bypass EDR) 15->64 23 CLZC3fzLvc0XV.exe 15->23 injected 25 SF4RvpKIao3K.exe 17->25 injected 66 Unusual module load detection (module proxying) 19->66 68 Switches to a custom stack to bypass stack traces 19->68 process7 process8 27 TCPSVCS.EXE 21->27         started        30 TCPSVCS.EXE 23->30         started        32 TCPSVCS.EXE 25->32         started        signatures9 50 Maps a DLL or memory area into another process 27->50 52 Unusual module load detection (module proxying) 27->52 54 Switches to a custom stack to bypass stack traces 27->54 34 yzPP8k7F.exe 27->34 injected 56 Modifies the context of a thread in another process (thread injection) 30->56 36 PHHjQCMWB.exe 30->36 injected process10
Score:
88%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/856d8419d52c0368f4aab3c196c8360dbbd4ba67c74d230bd7e0082b8f004f71
Verdict:
inconclusive
YARA:
1 match(es)
Tags:
Base64 Block Contains Base64 Block PowerShell T1059.001
Link:
https://app.malva.re/file/4a7b23d20ae2e24468e4f1070090cdc0
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/856d8419d52c0368f4aab3c196c8360dbbd4ba67c74d230bd7e0082b8f004f71/
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=qvwyigovfqbwr5fkwpaznsbwbw55jothy5gsgc6x4aecxdyaj5yq._file
Verdict:
malicious
Label(s):
DCRat
Create hunting rule
Formbook
Create hunting rule
Link:
https://reports.threatray.com/8622c7db-013d-468e-a80d-3b31ea541c1a
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook adware collection discovery execution rat spyware stealer trojan
Link:
https://tria.ge/reports/260819-w448eazhnb/
Behaviour
Modifies Internet Explorer settings
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
outlook_office_path
Command and Scripting Interpreter: PowerShell
System Location Discovery: System Language Discovery
Suspicious use of SetThreadContext
Accesses Microsoft Outlook profiles
Badlisted process makes network request
Family: Formbook
Formbook payload
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/856d8419d52c0368f4aab3c196c8360dbbd4ba67c74d230bd7e0082b8f004f71

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_Script_Inject_Detector
Create hunting rule
Author:DiegoAnalytics
Description:Detects attempts to inject code into another process across PE, ELF, Mach-O binaries
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
Create hunting rule
Author:Zinyth
Description:Detects 'encrypted' in ASCII, Unicode, base64, or hex-encoded
Rule name:dgaagas
Create hunting rule
Author:Harshit
Description:Uses certutil.exe to download a file named test.txt
Rule name:golang_bin_JCorn_CSC846
Create hunting rule
Author:Justin Cornwell
Description:CSC-846 Golang detection ruleset
Rule name:MD5_Constants
Create hunting rule
Author:phoul (@phoul)
Description:Look for MD5 constants
Rule name:pe_no_import_table
Create hunting rule
Description:Detect pe file that no import table
Rule name:RANSOMWARE
Create hunting rule
Author:ToroGuitar
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: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:TH_Win_ETW_Bypass_2025_CYFARE
Create hunting rule
Author:CYFARE
Description:Windows ETW Bypass Detection Rule - 2025
Reference:https://cyfare.net/

File information

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

Web download

Formbook

PowerShell (PS) ps1 856d8419d52c0368f4aab3c196c8360dbbd4ba67c74d230bd7e0082b8f004f71

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/3905601/
  
Delivery method
Distributed via web download

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