MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 e66ca5568b7156f5d0d890b4a996705b103be6a14fe74673e980f4636de98ebb. 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: 15

Intelligence 15 IOCs YARA 29 File information Comments

SHA256 hash:	e66ca5568b7156f5d0d890b4a996705b103be6a14fe74673e980f4636de98ebb
SHA3-384 hash:	b07c805f005400db580ae8b99439a229b0fd917c8dc301c42cffd871ac7582de814100f1c0cb5d409e616be209b1dc1f
SHA1 hash:	ad16d74688f65add2046668d83344c96eb2a65fd
MD5 hash:	3c0221f1a750b84ff1ae679c8883eb73
humanhash:	cardinal-east-washington-freddie
File name:	z1Comprobante_de_Pago.scr
Download:	download sample
Signature	QuasarRAT Create hunting rule
File size:	3'844'096 bytes
First seen:	2025-06-10 08:00:22 UTC
Last seen:	Never
File type:	exe
MIME type:	application/x-dosexec
imphash	f34d5f2d4577ed6d9ceec516c1f5a744 (48'652 x AgentTesla, 19'462 x Formbook, 12'204 x SnakeKeylogger)
ssdeep	98304:DxYaPCMmyDIZ8EjzvJWa8LR0XD5agnlw2wnLC7SU/LfM:DxYa6yivJ5SglrbMLqx/
Threatray	1 similar samples on MalwareBazaar
TLSH	T1B90633D8356432EFC817D8B3C9682D68A6403CB7070BE342A01735ADA9BD5A7CF255B7
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
dhash icon	5960139645174747 (2 x AsyncRAT, 1 x QuasarRAT)
Reporter	FXOLabs
Tags:	exe QuasarRAT

Intelligence

File Origin

# of uploads :

# of downloads :

540

Origin country :

Vendor Threat Intelligence

Malware family:

n/a

ID:

File name:

z1Comprobante_de_Pago.scr

Verdict:

Malicious activity

Analysis date:

2025-06-10 09:04:41 UTC

Tags:

auto-reg confuser crypto-regex

Link:

https://app.any.run/tasks/c76ff496-d869-433d-858a-8160505e6bfc

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/8306/

Detection(s):

SecuriteInfo.com.Win32.MalwareX-gen.23676.9098.UNOFFICIAL

PUA.Win.Packed.ConfuserEx-6582917-0

Verdict:

Malicious

Score:

94.9%

Link:

https://cyber-fortress.com/docs/result/index.php?id=6847e64607b5e8c1cfe606ca

Tags:

autorun packed micro sage

Result

Verdict:

Malware

Maliciousness:

Behaviour

Searching for synchronization primitives

Creating a file

Launching the default Windows debugger (dwwin.exe)

Creating a window

Сreating synchronization primitives

Creating a file in the %AppData% subdirectories

Launching a process

Searching for the window

Unauthorized injection to a recently created process

Restart of the analyzed sample

Enabling autorun by creating a file

Verdict:

Likely Malicious

Threat level:

7.5/10

Confidence:

100%

Tags:

base64 confuser confuserex masquerade net obfuscated obfuscated packed packed packer_detected

Link:

https://www.filescan.io/uploads/6847e64f2d1d8b12425fa82e/reports/6f15b886-ed4a-4e0f-9951-dc6634dae080/overview

Verdict:

Malicious

Labled as:

MSILHeracles.Generic

Link:

https://www.hybrid-analysis.com/sample/e66ca5568b7156f5d0d890b4a996705b103be6a14fe74673e980f4636de98ebb

Verdict:

Malicious

Link:

https://analyze.intezer.com/analyses/66eacadc-e471-42eb-a482-dd1975f0cb53

Result

Threat name:

Quasar

Detection:

malicious

Classification:

troj.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1710593

Signature

.NET source code contains potential unpacker

Antivirus / Scanner detection for submitted sample

Antivirus detection for dropped file

Found malware configuration

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

Injects a PE file into a foreign processes

Joe Sandbox ML detected suspicious sample

Malicious sample detected (through community Yara rule)

Multi AV Scanner detection for dropped file

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)

Uses schtasks.exe or at.exe to add and modify task schedules

Uses threadpools to delay analysis

Yara detected Quasar RAT

Behaviour

Behavior Graph:

Download SVG

Score:

100%

Verdict:

Malware

File Type:

Link:

https://malprob.io/report/e66ca5568b7156f5d0d890b4a996705b103be6a14fe74673e980f4636de98ebb

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/e66ca5568b7156f5d0d890b4a996705b103be6a14fe74673e980f4636de98ebb/

Threat name:

Win32.Malware.Heuristic

Status:

Malicious

First seen:

2025-06-10 08:01:13 UTC

File Type:

PE (.Net Exe)

Extracted files:

AV detection:

19 of 36 (52.78%)

Threat level:

2/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=4zwkkvuloflplugysc2ktftqlmidxzvbj7tum47jqd2gg3pjr25q._file

Verdict:

malicious

Label(s):

agenttesla

Similar samples:

error

QuasarRAT

Result

Malware family:

quasar

Score:

10/10

Tags:

family:quasar botnet:office02 discovery spyware trojan

Link:

https://tria.ge/reports/250610-jwl1msbq6v/

Behaviour

Scheduled Task/Job: Scheduled Task

Suspicious use of AdjustPrivilegeToken

Suspicious use of UnmapMainImage

Suspicious use of WriteProcessMemory

Program crash

System Location Discovery: System Language Discovery

Suspicious use of SetThreadContext

Executes dropped EXE

Quasar family

Quasar payload

Quasar RAT

Malware Config

C2 Extraction:

mjoatboating.ydns.eu:4787

Verdict:

Malicious

Tags:

red_team_tool

YARA:

SUSP_NET_NAME_ConfuserEx

Link:

https://app.threat.zone/submission/c0d5939a-6d0e-4359-8119-fed80e022243

Unpacked files

SH256 hash:

e66ca5568b7156f5d0d890b4a996705b103be6a14fe74673e980f4636de98ebb

MD5 hash:

3c0221f1a750b84ff1ae679c8883eb73

SHA1 hash:

ad16d74688f65add2046668d83344c96eb2a65fd

Link:

https://www.unpac.me/results/5ba21f5a-0d5d-4cff-a207-79c2108ae5c8/

SH256 hash:

33f08850551decbba0dafb2b0bb57e78bc69f1503fed42b0205365de8020ddd9

MD5 hash:

d0a6e03a97a91b300fc083a06d1d5df9

SHA1 hash:

249bc7d782372a43424d4d3b7b250e5336a9b603

Detections:

SUSP_NET_NAME_ConfuserEx

INDICATOR_EXE_Packed_ConfuserEx

INDICATOR_EXE_Packed_ConfuserEx_Custom

Link:

https://www.unpac.me/results/5ba21f5a-0d5d-4cff-a207-79c2108ae5c8/

SH256 hash:

928d56fdabb894f00467cc87b10f60565af498b3ab54ef13f21248df055c3e81

MD5 hash:

4f1122b10e65a95fc3faef8f1c2e4629

SHA1 hash:

64171cff597dac25d0f41f375844c56795ccac14

Detections:

QuasarRAT

cn_utf8_windows_terminal

malware_windows_xrat_quasarrat

MAL_QuasarRAT_May19_1

MAL_BackNet_Nov18_1

INDICATOR_EXE_Packed_Fody

INDICATOR_SUSPICIOUS_EXE_SandboxHookingDLL

INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Link:

https://www.unpac.me/results/5ba21f5a-0d5d-4cff-a207-79c2108ae5c8/

SH256 hash:

d2b542fd00c77521baef25021b2d50d2989cc6a7912b1082aea51d5ff97b4bfa

MD5 hash:

f82066a9b11b51c4a3f805f24cee5036

SHA1 hash:

7032b9c4fdf2c76fd7aca921dfa2af8db0b4461c

Link:

https://www.unpac.me/results/5ba21f5a-0d5d-4cff-a207-79c2108ae5c8/

SH256 hash:

60ca1574d0c916d1f5686bcf871488710a2677a68c94f65a2be47d707976c061

MD5 hash:

d8c04d4e36632b4d5fb0ffab446877ed

SHA1 hash:

6092ad4043c572c8a5616f8a1b343aa94bca25a3

Detections:

SUSP_NET_Large_Static_Array_In_Small_File_Jan24

HKTL_NET_GUID_Quasar

Link:

https://www.unpac.me/results/5ba21f5a-0d5d-4cff-a207-79c2108ae5c8/

Parent samples :
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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/e66ca5568b7156f5d0d890b4a996705b103be6a14fe74673e980f4636de98ebb

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:	Costura_Protobuf Create hunting rule
Author:	@bartblaze
Description:	Identifies Costura and Protobuf in .NET assemblies, respectively for storing resources and (de)serialization. Seen together might indicate a suspect binary.

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

Rule name:	INDICATOR_EXE_Packed_ConfuserEx Create hunting rule
Author:	ditekSHen
Description:	Detects executables packed with ConfuserEx Mod

Rule name:	INDICATOR_EXE_Packed_ConfuserEx_Custom Create hunting rule
Author:	ditekSHen
Description:	Detects executables packed with ConfuserEx Custom; outside of GIT

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
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.

Malspam

QuasarRAT

exe e66ca5568b7156f5d0d890b4a996705b103be6a14fe74673e980f4636de98ebb

(this sample)

Delivery method

Distributed via e-mail attachment

Cape

https://www.capesandbox.com/analysis/8306/

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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