MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 4bfe02df6ed7e7511a1ae9c44a2d1eed1b45147037c1c8770bc7be0fb6622a74. 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

AsyncRAT

Vendor detections: 19

Intelligence 19 IOCs YARA 25 File information Comments 1

SHA256 hash:	4bfe02df6ed7e7511a1ae9c44a2d1eed1b45147037c1c8770bc7be0fb6622a74
SHA3-384 hash:	d32893e5add2fcc0d17f4c702179fc9cabd822a40b90f52614daa0d7c45b33732b9d7d881959c87b589bbe53fe3738b4
SHA1 hash:	52fb7321acc2a2ba73db7180a0505398dbccb4b7
MD5 hash:	50c479a0b0b24696f9a6f8661db3d6c0
humanhash:	island-river-kitten-winter
File name:	CalybraB.exe
Download:	download sample
Signature	AsyncRAT Create hunting rule
File size:	47'104 bytes
First seen:	2026-02-03 19:26:08 UTC
Last seen:	Never
File type:	exe
MIME type:	application/x-dosexec
imphash	f34d5f2d4577ed6d9ceec516c1f5a744 (48'754 x AgentTesla, 19'661 x Formbook, 12'252 x SnakeKeylogger)
ssdeep	768:iu/euTMUzwJbWUnBtJmo2qV6T2QAm7PINtjbcgX3idju9IlcidjoBDZyT:iu/euTMzX2mTNlbzXSdjOOjOdyT
TLSH	T109232A007BE9823AF2BF4BB85DF26145867AF5633603D64D2CC451DB5623FC28A426F9
TrID	67.7% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13) 9.7% (.EXE) Win64 Executable (generic) (10522/11/4) 6.0% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2) 4.6% (.EXE) Win16 NE executable (generic) (5038/12/1) 4.1% (.EXE) Win32 Executable (generic) (4504/4/1)
Magika	pebin
Reporter	Anonymous
Tags:	AsyncRAT exe

Anonymous

The sample SHA-256: 4bfe02df6ed7e7511a1ae9c44a2d1eed1b45147037c1c8770bc7be0fb6622a74 is consistently attributed by multiple security engines to the AsyncRAT lineage (MSIL). Vendor labels reference known AsyncRAT variants and related backdoor behavior, indicating remote access capabilities and post-infection control typical of this family. The convergence of family attribution across independent vendors supports inclusion of this file as a malware specimen in MalwareBazaar

Intelligence

File Origin

# of uploads :

# of downloads :

128

Origin country :

Vendor Threat Intelligence

Malware configuration found for:

AsyncRAT

Details

AsyncRAT

c2 socket addresses or a dead drop resolver url, a version, a mutex, an SSL certificate and server signature, an interval, varying flags, and possibly a filepath and a group

Link:

https://research.acce.ciphertechsolutions.com/results/d85e285e-c7ae-4547-9786-e6cd6f88ac95/

Malware family:

asyncrat

ID:

File name:

CalybraB.exe

Verdict:

Malicious activity

Analysis date:

2026-02-03 19:29:30 UTC

Tags:

auto-reg asyncrat

Link:

https://app.any.run/tasks/20d1333e-78ba-4d93-84b7-91cea34ede0d

Note:

ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample

Detection:

AsyncRAT

Link:

https://www.capesandbox.com/analysis/51561/

Detection(s):

Win.Packed.Razy-9625918-0

Win.Packed.AsyncRAT-9856570-1

Verdict:

Malicious

Score:

99.9%

Link:

https://cyber-fortress.com/docs/result/index.php?id=69824bdb9a60ec70d92c89f0

Tags:

asyncrat autorun

Result

Verdict:

Malware

Maliciousness:

Behaviour

Сreating synchronization primitives

Running batch commands

Creating a process with a hidden window

Creating a file in the %AppData% directory

Creating a file in the %temp% directory

Creating a file

Launching a process

Creating a process from a recently created file

DNS request

Connection attempt

Unauthorized injection to a recently created process

Enabling autorun by creating a file

Verdict:

Malicious

Threat level:

10/10

Confidence:

100%

Tags:

anti-vm asyncrat asyncrat base64 config-extracted fareit fingerprint lolbin obfuscated razy reconnaissance reg samas schtasks vbnet

Link:

https://www.filescan.io/uploads/69824bd9930564ff3c87a0a6/reports/2f15d7bc-8b8a-4fd7-a622-59e10416f6a7/overview

Verdict:

Malicious

Labled as:

AsyncRAT.Marte.B.Generic

Link:

https://www.hybrid-analysis.com/sample/4bfe02df6ed7e7511a1ae9c44a2d1eed1b45147037c1c8770bc7be0fb6622a74

Result

Gathering data

Verdict:

Malicious

Link:

https://analyze.intezer.com/analyses/fb126819-af35-4622-ae60-722621b44fcd

Score:

99%

Verdict:

Malware

File Type:

Link:

https://malprob.io/report/4bfe02df6ed7e7511a1ae9c44a2d1eed1b45147037c1c8770bc7be0fb6622a74

Gathering data

Detection:

asyncrat

Link:

https://mwdb.cert.pl/sample/4bfe02df6ed7e7511a1ae9c44a2d1eed1b45147037c1c8770bc7be0fb6622a74/

Verdict:

Malicious

Threat:

Family.ANARCHYRAT

Link:

https://tip.neiki.dev/file/4bfe02df6ed7e7511a1ae9c44a2d1eed1b45147037c1c8770bc7be0fb6622a74

Threat name:

ByteCode-MSIL.Backdoor.AsyncRAT

Status:

Malicious

First seen:

2026-02-03 19:26:22 UTC

File Type:

PE (.Net Exe)

Extracted files:

AV detection:

30 of 36 (83.33%)

Threat level:

5/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=jp7afx3o27tvcgq25hceuli65unukfdqg7a4q5yly67a7ntcfj2a._file

Verdict:

malicious

Label(s):

asyncrat

Similar samples:

error

AsyncRAT

Result

Malware family:

asyncrat

Score:

10/10

Tags:

family:asyncrat botnet:crb defense_evasion discovery execution persistence rat

Link:

https://tria.ge/reports/260203-x5mkese19a/

Behaviour

Delays execution with timeout.exe

Scheduled Task/Job: Scheduled Task

Suspicious behavior: EnumeratesProcesses

Suspicious use of AdjustPrivilegeToken

Suspicious use of WriteProcessMemory

Enumerates physical storage devices

System Location Discovery: System Language Discovery

Checks computer location settings

Executes dropped EXE

Async RAT payload

AsyncRat

Asyncrat family

Malware Config

C2 Extraction:

waike.cn.com:4782
waike.cn.com:1604
waike.cn.com:1337
www.waike.cn.com:4782
www.waike.cn.com:1604
www.waike.cn.com:1337
simplifycrm.it.com:4782
simplifycrm.it.com:1604
simplifycrm.it.com:1337
www.simplifycrm.it.com:4782
www.simplifycrm.it.com:1604
www.simplifycrm.it.com:1337
ltnhez.sa.com:4782
ltnhez.sa.com:1604
ltnhez.sa.com:1337
www.ltnhez.sa.com:4782
www.ltnhez.sa.com:1604
www.ltnhez.sa.com:1337

Unpacked files

SH256 hash:

4bfe02df6ed7e7511a1ae9c44a2d1eed1b45147037c1c8770bc7be0fb6622a74

MD5 hash:

50c479a0b0b24696f9a6f8661db3d6c0

SHA1 hash:

52fb7321acc2a2ba73db7180a0505398dbccb4b7

Detections:

win_asyncrat_w0

AsyncRAT

Link:

https://www.unpac.me/results/37a43899-aea4-4019-a042-63b98b4ccfd0/

Malware family:

AsyncRAT

Verdict:

Malicious

Link:

https://www.vmray.com/analyses/_mb/4bfe02df6ed7/report/overview.html

Please note that we are no longer able to provide a coverage score for Virus Total.

Threat name:

iSpy Keylogger

Score:

1.00

Link:

https://yomi.yoroi.company/submissions/4bfe02df6ed7e7511a1ae9c44a2d1eed1b45147037c1c8770bc7be0fb6622a74

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:	asyncrat Create hunting rule
Author:	JPCERT/CC Incident Response Group
Description:	detect AsyncRat in memory
Reference:	internal research

Rule name:	AsyncRat Create hunting rule
Author:	kevoreilly, JPCERT/CC Incident Response Group
Description:	AsyncRat Payload

Rule name:	asyncrat_kingrat Create hunting rule
Author:	jeFF0Falltrades

Rule name:	DebuggerCheck__RemoteAPI Create hunting rule
Reference:	https://github.com/naxonez/yaraRules/blob/master/AntiDebugging.yara

Rule name:	INDICATOR_SUSPICIOUS_EXE_ASEP_REG_Reverse Create hunting rule
Author:	ditekSHen
Description:	Detects file containing reversed ASEP Autorun registry keys

Rule name:	malware_asyncrat Create hunting rule
Author:	JPCERT/CC Incident Response Group
Description:	detect AsyncRat in memory
Reference:	internal research

Rule name:	malware_asyncrat Create hunting rule
Description:	detect AsyncRat in memory
Reference:	https://github.com/NYAN-x-CAT/AsyncRAT-C-Sharp

Rule name:	MAL_AsnycRAT Create hunting rule
Author:	SECUINFRA Falcon Team
Description:	Detects AsnycRAT based on it's config decryption routine

Rule name:	MAL_AsyncRAT_Config_Decryption Create hunting rule
Author:	SECUINFRA Falcon Team
Description:	Detects AsnycRAT based on it's config decryption routine

Rule name:	Mal_WIN_AsyncRat_RAT_PE Create hunting rule
Author:	Phatcharadol Thangplub
Description:	Use to detect AsyncRAT implant.

Rule name:	msil_suspicious_use_of_strreverse Create hunting rule
Author:	dr4k0nia
Description:	Detects mixed use of Microsoft.CSharp and VisualBasic to use StrReverse

Rule name:	Multifamily_RAT_Detection Create hunting rule
Author:	Lucas Acha (http://www.lukeacha.com)
Description:	Generic Detection for multiple RAT families, PUPs, Packers and suspicious executables

Rule name:	NET Create hunting rule
Author:	malware-lu

Rule name:	NETexecutableMicrosoft Create hunting rule
Author:	malware-lu

Rule name:	Njrat Create hunting rule
Author:	botherder https://github.com/botherder
Description:	Njrat

Rule name:	pe_imphash Create hunting rule

Rule name:	Skystars_Malware_Imphash Create hunting rule
Author:	Skystars LightDefender
Description:	imphash

Rule name:	SUSP_DOTNET_PE_List_AV Create hunting rule
Author:	SECUINFRA Falcon Team
Description:	Detecs .NET Binary that lists installed AVs

Rule name:	SUSP_Reverse_Run_Key Create hunting rule
Author:	SECUINFRA Falcon Team
Description:	Detects a Reversed Run Key

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:	Windows_Generic_Threat_ce98c4bc Create hunting rule
Author:	Elastic Security

Rule name:	win_asyncrat_bytecodes Create hunting rule
Author:	Matthew @ Embee_Research
Description:	Detects bytecodes present in unobfuscated AsyncRat Samples. Rule may also pick up on other Asyncrat-derived malware (Dcrat/venom etc)

Rule name:	win_asyncrat_j1 Create hunting rule
Author:	Johannes Bader @viql
Description:	detects AsyncRAT

Rule name:	win_asyncrat_unobfuscated Create hunting rule
Author:	Matthew @ Embee_Research
Description:	Detects strings present in unobfuscated AsyncRat Samples. Rule may also pick up on other Asyncrat-derived malware (Dcrat/venom etc)

Rule name:	win_asyncrat_w0 Create hunting rule
Author:	JPCERT/CC Incident Response Group
Description:	detect AsyncRat in memory
Reference:	internal research

File information

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

Web download

AsyncRAT

exe 4bfe02df6ed7e7511a1ae9c44a2d1eed1b45147037c1c8770bc7be0fb6622a74

(this sample)

Link

https://www.virustotal.com/gui/file/4bfe02df6ed7e7511a1ae9c44a2d1eed1b45147037c1c8770bc7be0fb6622a74

Dropped by

AsyncRAT

Delivery method

Distributed via web download

Cape

https://www.capesandbox.com/analysis/51561/

Comments

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commented on 2026-02-03 19:31:08 UTC

RAT King Parser (https://github.com/jeFF0Falltrades/rat_king_parser) Output:

{
"sha256": "4bfe02df6ed7e7511a1ae9c44a2d1eed1b45147037c1c8770bc7be0fb6622a74",
"yara_possible_family": "asyncrat",
"key": "d0e151c1c7c8f0695e402d6cad23dc582815157aba6afad4508ddbb8492b24af",
"salt": "bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941",
"config": {
"Ports": [
"4782",
"1604",
"1337"
],
"Hosts": [
"waike.cn.com",
"www.waike.cn.com",
"simplifycrm.it.com",
"www.simplifycrm.it.com",
"ltnhez.sa.com",
"www.ltnhez.sa.com"
],
"Version": "0.5.8",
"Install": "true",
"InstallFolder": "%AppData%",
"InstallFile": "CalybraB.exe",
"Key": "OFBRd3hYUW54aEZ6SmhSZERMaEMzVGJRU3VrM3Q3aHI=",
"Mutex": "3Cuh9VIRdiuz",
"Certificate": "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",
"Serversignature": "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",
"Anti": "false",
"Pastebin": "null",
"BDOS": "false",
"Hwid": "null",
"Delay": "3",
"Group": "CRB"
}
}