MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 fefcf51745f418e4d6d8d4a62dd2bf723ab2bb21c5965523ecd0e670eec1f9aa. 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

QuasarRAT

Vendor detections: 18

Intelligence 18 IOCs YARA 25 File information Comments

SHA256 hash:	fefcf51745f418e4d6d8d4a62dd2bf723ab2bb21c5965523ecd0e670eec1f9aa
SHA3-384 hash:	80caba1cab82c8b6384653e5b242dd77efcc90e0fecadac3df8923903fbeef18f8dada56ff379974df09585aec647a9f
SHA1 hash:	2639cd26f280bf3a8f8d4d9839e6e54047ca7493
MD5 hash:	6e2178613d2271b0b398cd307fad3e40
humanhash:	pasta-foxtrot-earth-summer
File name:	pulsar.exe
Download:	download sample
Signature	QuasarRAT Create hunting rule
File size:	1'868'800 bytes
First seen:	2025-08-18 12:31:25 UTC
Last seen:	Never
File type:	exe
MIME type:	application/x-dosexec
imphash	f34d5f2d4577ed6d9ceec516c1f5a744 (48'663 x AgentTesla, 19'478 x Formbook, 12'208 x SnakeKeylogger)
ssdeep	24576:aRQClfHyclOYM5NKij8QzO4lcHNF0tXZWLuyWfNlHoAcK1fNe:aRQ6SGOGqnXpyWAA51f
TLSH	T1E1850250B7E88606E1FF2BB9E8B216454B73F653D936DB4F1988905C0EA77808E513B3
TrID	62.2% (.RLL) Microsoft Resource Library (x86) (177572/6/26) 25.6% (.EXE) Generic CIL Executable (.NET, Mono, etc.) (73123/4/13) 3.6% (.EXE) Win64 Executable (generic) (10522/11/4) 2.3% (.DLL) Win32 Dynamic Link Library (generic) (6578/25/2) 1.7% (.EXE) Win16 NE executable (generic) (5038/12/1)
Magika	pebin
Reporter	burger
Tags:	exe QuasarRAT

Intelligence

File Origin

# of uploads :

# of downloads :

Origin country :

Vendor Threat Intelligence

Malware family:

n/a

ID:

File name:

pulsar.exe

Verdict:

Malicious activity

Analysis date:

2025-08-18 12:31:19 UTC

Tags:

crypto-regex

Link:

https://app.any.run/tasks/06e1ab36-50b3-4b89-b889-8fa479eeaefa

Note:

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

Detection:

n/a

Link:

https://www.capesandbox.com/analysis/21942/

Detection(s):

Win.Malware.Generic-9883083-0

Win.Malware.Bulz-9933026-0

ditekSHen.MALWARE.Win.Trojan.QuasarStealer.UNOFFICIAL

Win.Malware.Generic-6623004-0

Verdict:

Malicious

Score:

99.9%

Link:

https://cyber-fortress.com/docs/result/index.php?id=68a31d16c2f5296a1a28234a

Tags:

vmdetect quasar emotet

Result

Verdict:

Malware

Maliciousness:

Behaviour

Creating a window

Сreating synchronization primitives

Setting a keyboard event handler

Connection attempt to an infection source

DNS request

Connection attempt

Sending a custom TCP request

Using the Windows Management Instrumentation requests

Query of malicious DNS domain

Sending a TCP request to an infection source

Verdict:

Malicious

Threat level:

10/10

Confidence:

100%

Tags:

anti-debug anti-vm anti-vm base64 cmd cscript explorer fingerprint hacktool lolbin mshta obfuscated packed privilege reconnaissance runonce schtasks threat update

Link:

https://www.filescan.io/uploads/68a31d3cba1f5bb1e60cf058/reports/b5dd1db6-c646-4168-801d-9a046e0a2fe2/overview

Verdict:

Malicious

Labled as:

IL:Trojan.MSILZilla

Link:

https://www.hybrid-analysis.com/sample/fefcf51745f418e4d6d8d4a62dd2bf723ab2bb21c5965523ecd0e670eec1f9aa

Verdict:

Malicious

Link:

https://analyze.intezer.com/analyses/40285bf1-ac78-4531-8faa-1ba5a9d396a4

Result

Threat name:

Quasar

Detection:

malicious

Classification:

troj.spyw.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1759292

Signature

.NET source code contains potential unpacker

Antivirus / Scanner detection for submitted sample

Contains functionality to disable the Task Manager (.Net Source)

Found malware configuration

Hides that the sample has been downloaded from the Internet (zone.identifier)

Installs a global keyboard hook

Malicious sample detected (through community Yara rule)

Multi AV Scanner detection for submitted file

Sample uses string decryption to hide its real strings

Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)

Yara detected Quasar RAT

Behaviour

Behavior Graph:

Download SVG

Score:

99%

Verdict:

Malware

File Type:

Link:

https://malprob.io/report/fefcf51745f418e4d6d8d4a62dd2bf723ab2bb21c5965523ecd0e670eec1f9aa

Verdict:

QuasarRat

YARA:

15 match(es)

Tags:

.Net Executable Fody/Costura Packer Html Malicious Managed .NET PDB Path PE (Portable Executable) PE File Layout QuasarRat RAT SOS: 0.14 SOS: 0.15 SOS: 0.18 SOS: 0.20 SOS: 0.22 SOS: 0.23 SOS: 0.24 SOS: 0.25 SOS: 0.26 SOS: 0.27 SOS: 0.29 SOS: 0.32 SOS: 0.34 SOS: 0.35 SOS: 0.63 Win 32 Exe x86

Link:

https://app.malva.re/file/6e2178613d2271b0b398cd307fad3e40

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/fefcf51745f418e4d6d8d4a62dd2bf723ab2bb21c5965523ecd0e670eec1f9aa/

Verdict:

Malicious

Threat:

Trojan.MSIL.Quasar

Link:

https://tip.neiki.dev/file/fefcf51745f418e4d6d8d4a62dd2bf723ab2bb21c5965523ecd0e670eec1f9aa

Threat name:

ByteCode-MSIL.Hacktool.Aikaantivm

Status:

Malicious

First seen:

2025-08-18 12:31:20 UTC

File Type:

PE (.Net Exe)

Extracted files:

AV detection:

23 of 24 (95.83%)

Threat level:

1/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=736pkf2f6qmojvwy2stc3uv7oi5lfozbywlfki7m2dthb3wb7gva._file

Verdict:

malicious

Label(s):

quasarrat

Similar samples:

error

QuasarRAT

Result

Malware family:

quasar

Score:

10/10

Tags:

family:quasar botnet:pulsar defense_evasion spyware trojan

Link:

https://tria.ge/reports/250818-pqe8sstjt9/

Behaviour

Modifies system certificate store

Suspicious behavior: AddClipboardFormatListener

Suspicious use of AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Modifies trusted root certificate store through registry

Quasar RAT

Quasar family

Quasar payload

Malware Config

C2 Extraction:

kecfcnyn-28082.portmap.host:28082

Verdict:

Malicious

Tags:

red_team_tool backdoor backnet rat quasar_rat Win.Malware.Generic-9883083-0

YARA:

HKTL_EXE_AlKhaser_Jul_01 MAL_BackNet_Nov18_1 MAL_QuasarRAT_May19_1 malware_windows_quasarrat

Link:

https://app.threat.zone/submission/7611b0f5-cd01-4571-bbf2-de106374b627

Unpacked files

SH256 hash:

fefcf51745f418e4d6d8d4a62dd2bf723ab2bb21c5965523ecd0e670eec1f9aa

MD5 hash:

6e2178613d2271b0b398cd307fad3e40

SHA1 hash:

2639cd26f280bf3a8f8d4d9839e6e54047ca7493

Detections:

QuasarRAT

Link:

https://www.unpac.me/results/b1291bc3-8d07-4203-9f9f-5851e9a8f890/

SH256 hash:

0871e634a53b09397210909e2bc6735b8a89ff9c23a2ce4437503ec4f5812a32

MD5 hash:

3b72d381b81d3af33725aac193c710a4

SHA1 hash:

da75fb0f8d40857d542a91f2ba995ed9c85a452b

Detections:

SUSP_NET_Large_Static_Array_In_Small_File_Jan24

HKTL_NET_GUID_Quasar

Link:

https://www.unpac.me/results/b1291bc3-8d07-4203-9f9f-5851e9a8f890/

Malware family:

QuasarRAT

Verdict:

Malicious

Link:

https://www.vmray.com/analyses/_mb/fefcf51745f4/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/fefcf51745f418e4d6d8d4a62dd2bf723ab2bb21c5965523ecd0e670eec1f9aa

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:	Check_Dlls Create hunting rule

Rule name:	DebuggerCheck__API 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__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:	Detect_PowerShell_Obfuscation Create hunting rule
Author:	daniyyell
Description:	Detects obfuscated PowerShell commands commonly used in malicious scripts.

Rule name:	FreddyBearDropper Create hunting rule
Author:	Dwarozh Hoshiar
Description:	Freddy Bear Dropper is dropping a malware through base63 encoded powershell scrip.

Rule name:	golang_bin_JCorn_CSC846 Create hunting rule
Author:	Justin Cornwell
Description:	CSC-846 Golang detection ruleset

Rule name:	INDICATOR_EXE_Packed_Fody Create hunting rule
Author:	ditekSHen
Description:	Detects executables manipulated with Fody

Rule name:	Indicator_MiniDumpWriteDump Create hunting rule
Author:	Obscurity Labs LLC
Description:	Detects PE files and PowerShell scripts that use MiniDumpWriteDump either through direct imports or string references

Rule name:	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA Create hunting rule
Author:	ditekSHen
Description:	Detects Windows executables referencing non-Windows User-Agents

Rule name:	INDICATOR_SUSPICIOUS_EXE_SandboxHookingDLL Create hunting rule
Author:	ditekSHen
Description:	Detects binaries and memory artifacts referencing sandbox DLLs typically observed in sandbox evasion

Rule name:	MAL_BackNet_Nov18_1 Create hunting rule
Author:	Florian Roth (Nextron Systems)
Description:	Detects BackNet samples
Reference:	https://github.com/valsov/BackNet

Rule name:	MAL_BackNet_Nov18_1_RID2D6D Create hunting rule
Author:	Florian Roth
Description:	Detects BackNet samples
Reference:	https://github.com/valsov/BackNet

Rule name:	MAL_QuasarRAT_May19_1 Create hunting rule
Description:	Detects QuasarRAT malware

Rule name:	MAL_QuasarRAT_May19_1 Create hunting rule
Author:	Florian Roth (Nextron Systems)
Description:	Detects QuasarRAT malware
Reference:	https://blog.ensilo.com/uncovering-new-activity-by-apt10

Rule name:	MAL_QuasarRAT_May19_1_RID2E1E Create hunting rule
Author:	Florian Roth
Description:	Detects QuasarRAT malware
Reference:	https://blog.ensilo.com/uncovering-new-activity-by-apt10

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:	pe_imphash Create hunting rule

Rule name:	RANSOMWARE Create hunting rule
Author:	ToroGuitar

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

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:	Sus_Obf_Enc_Spoof_Hide_PE Create hunting rule
Author:	XiAnzheng
Description:	Check for Overlay, Obfuscating, Encrypting, Spoofing, Hiding, or Entropy Technique(can create FP)

File information

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

Cape

https://www.capesandbox.com/analysis/21942/

BLint

The following table provides more information about this file using BLint. BLint is a Binary Linter to check the security properties, and capabilities in executables.

Findings

ID	Title	Severity
CHECK_AUTHENTICODE	Missing Authenticode	high
CHECK_DLL_CHARACTERISTICS	Missing dll Security Characteristics (GUARD_CF)	high

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