MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 4591828804fe213b5d6a005bdcc6d9eecd1f97b6a25eff6e5e951bbabe03f7f6. 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: 9


Intelligence 9 IOCs YARA 5 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 4591828804fe213b5d6a005bdcc6d9eecd1f97b6a25eff6e5e951bbabe03f7f6
SHA3-384 hash: db2bcbb665f58364ce8e82e3b092cbcde12f015f8f7e9883bc975e218825fce8c5a9b4c1ccf77c9eae4863fbfefe7217
SHA1 hash: d2f459d715db11a12e5db1f1be4ab18c1b6cb46e
MD5 hash: 69d2a6d964db444b72e3755165c19300
humanhash: emma-failed-north-summer
File name:Build.bat
Download: download sample
Signature QuasarRAT
Create hunting rule
File size:8'869'258 bytes
First seen:2025-11-18 22:28:33 UTC
Last seen:Never
File type:Batch (bat) bat
MIME type:text/plain
ssdeep 49152:pVqKLGCV0K4fjjctrdTlL/6tZwYxN5m8SadIi9BAEkSIXwzYoAsT7heoMYel6CWd:Y
Threatray 83 similar samples on MalwareBazaar
TLSH T1C19633028E9E8EAF4B7C325C307F0D4E3AA44F844025BDE577E1BCDD168ED16249B699
Magika txt
Reporter smica83
Tags:bat QuasarRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
66
Origin country :
HU HU
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
Build.bat
Verdict:
No threats detected
Analysis date:
2025-11-18 22:29:02 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/2327daa8-1231-4a81-82fe-79bd6b595350

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/38620/
Verdict:
Clean
Score:
70%
Link:
https://cyber-fortress.com/docs/result/index.php?id=691cf341bdb0ec3a9dc341b5
Tags:
n/a
Result
Verdict:
Malware
Maliciousness:

Behaviour
Unauthorized injection to a browser process
Launching a process
Setting browser functions hooks
Unauthorized injection to a system process
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
anti-vm base64 base64 conhost evasive lolbin obfuscated packed powershell reconnaissance schtasks
Link:
https://www.filescan.io/uploads/691cf33fe68d9822a37c681c/reports/eb36a346-a63b-4e59-949e-3988da967425/overview
Verdict:
Unknown
Link:
https://www.hybrid-analysis.com/sample/4591828804fe213b5d6a005bdcc6d9eecd1f97b6a25eff6e5e951bbabe03f7f6
Verdict:
Clean
File Type:
text
Link:
https://opentip.kaspersky.com/4591828804fe213b5d6a005bdcc6d9eecd1f97b6a25eff6e5e951bbabe03f7f6/results?tab=lookup
Result
Threat name:
Quasar
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1816562
Signature
.NET source code contains potential unpacker
.NET source code contains process injector
.NET source code references suspicious native API functions
Allocates memory in foreign processes
Bypasses PowerShell execution policy
Connects to a pastebin service (likely for C&C)
Contains functionality to disable the Task Manager (.Net Source)
Contains functionality to inject code into remote processes
Creates a thread in another existing process (thread injection)
Found large BAT file
Hides that the sample has been downloaded from the Internet (zone.identifier)
Hooks files or directories query functions (used to hide files and directories)
Hooks processes query functions (used to hide processes)
Hooks registry keys query functions (used to hide registry keys)
Injects a PE file into a foreign processes
Injects code into the Windows Explorer (explorer.exe)
Joe Sandbox ML detected suspicious sample
Malicious sample detected (through community Yara rule)
Modifies the prolog of user mode functions (user mode inline hooks)
Sample uses string decryption to hide its real strings
Sets debug register (to hijack the execution of another thread)
Sigma detected: Base64 Encoded PowerShell Command Detected
Sigma detected: Malicious Base64 Encoded PowerShell Keywords in Command Lines
Sigma detected: Potentially Suspicious PowerShell Child Processes
Sigma detected: PowerShell Base64 Encoded FromBase64String Cmdlet
Sigma detected: Powerup Write Hijack DLL
Sigma detected: Schedule system process
Sigma detected: Suspicious PowerShell Parameter Substring
Suspicious powershell command line found
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Uses cmd line tools excessively to alter registry or file data
Uses schtasks.exe or at.exe to add and modify task schedules
Writes to foreign memory regions
Yara detected AntiVM3
Yara detected Powershell decode and execute
Yara detected Quasar RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1816562 Sample: Build.bat Startdate: 18/11/2025 Architecture: WINDOWS Score: 100 55 pastebin.com 2->55 63 Malicious sample detected (through community Yara rule) 2->63 65 Yara detected Powershell decode and execute 2->65 67 Yara detected AntiVM3 2->67 71 19 other signatures 2->71 10 cmd.exe 1 2->10         started        signatures3 69 Connects to a pastebin service (likely for C&C) 55->69 process4 signatures5 91 Uses cmd line tools excessively to alter registry or file data 10->91 13 conhost.exe 10->13         started        16 conhost.exe 10->16         started        process6 signatures7 93 Suspicious powershell command line found 13->93 18 powershell.exe 16 56 13->18         started        95 Bypasses PowerShell execution policy 16->95 process8 dnsIp9 57 147.185.221.29, 41700 SALSGIVERUS United States 18->57 59 pastebin.com 104.20.29.150, 443, 49687 CLOUDFLARENETUS United States 18->59 51 C:\Windows\startup_393.bat, ASCII 18->51 dropped 53 C:\Users\user\AppData\Local\Temp\tmp393.xml, XML 18->53 dropped 73 Tries to detect sandboxes and other dynamic analysis tools (process name or module or function) 18->73 75 Uses schtasks.exe or at.exe to add and modify task schedules 18->75 77 Sets debug register (to hijack the execution of another thread) 18->77 79 4 other signatures 18->79 23 winlogon.exe 18->23 injected 26 cmd.exe 1 18->26         started        28 cmd.exe 1 18->28         started        30 13 other processes 18->30 file10 signatures11 process12 signatures13 81 Injects code into the Windows Explorer (explorer.exe) 23->81 83 Contains functionality to inject code into remote processes 23->83 85 Writes to foreign memory regions 23->85 89 3 other signatures 23->89 32 lsass.exe 23->32 injected 35 dwm.exe 23->35 injected 47 16 other processes 23->47 87 Uses cmd line tools excessively to alter registry or file data 26->87 37 conhost.exe 26->37         started        39 reg.exe 1 1 26->39         started        41 conhost.exe 28->41         started        43 reg.exe 1 1 28->43         started        45 conhost.exe 30->45         started        49 19 other processes 30->49 process14 signatures15 61 Writes to foreign memory regions 32->61
Score:
99%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/4591828804fe213b5d6a005bdcc6d9eecd1f97b6a25eff6e5e951bbabe03f7f6
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/4591828804fe213b5d6a005bdcc6d9eecd1f97b6a25eff6e5e951bbabe03f7f6/
Verdict:
Clean
Link:
https://tip.neiki.dev/file/4591828804fe213b5d6a005bdcc6d9eecd1f97b6a25eff6e5e951bbabe03f7f6
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=iwiyfcae7yqtwxlkabn5zrwz53gr7f5wujpp63s6sun3vpqd673a._file
Verdict:
malicious
Label(s):
r77rootkit
Create hunting rule
Similar samples:
01a970d4babfcc5be59ebefa425e49f1e349745e42ff492f45c43c49ab5474ec
QuasarRAT
15677075b789688ce1e275059ffa60558113512418585628dd4f2af3414e8896
QuasarRAT
27dd30525e0be342fc3b931194c0edb06a9f3eff6e03aba8582d4d30432db386
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294f1af51f6fc74b23f052c7ddabf9bad27d536930090c5ee37e1e7704991c76
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58d206fec695b1762412072302c302cec3cf4174b4576521e9fb78a44ae54eef
QuasarRAT
76884d65172a609ec6a3ef5594c1c98ec1dc5c3b429ce4e788a71a79d6ff8b7f
QuasarRAT
84194d364ade96d7542b306008b267585b36fd077962006314ead79ba4ddb09e
QuasarRAT
9718c621907b1aafada7dfbd980e6feba50cf5238c2215c2268f8d2d7125d030
QuasarRAT
9c2647c32c2a546150e6afc4fb8148b1af3939ff7ae2e45c3db5e31fd021b259
QuasarRAT
b35455cad92986d46a0122a606d621c856af5cfe16a755163c38ab24a62938a2
QuasarRAT
error
QuasarRAT
+ 73 additional samples on MalwareBazaar
Result
Malware family:
quasar
Create hunting rule
Score:
  10/10
Tags:
family:quasar bootkit defense_evasion execution persistence spyware trojan
Link:
https://tria.ge/reports/251118-2ecpravmhk/
Behaviour
Checks SCSI registry key(s)
Checks processor information in registry
Enumerates system info in registry
Modifies data under HKEY_USERS
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Drops file in Windows directory
Drops file in System32 directory
Enumerates connected drives
Legitimate hosting services abused for malware hosting/C2
Writes to the Master Boot Record (MBR)
Checks BIOS information in registry
Indicator Removal: Clear Windows Event Logs
Badlisted process makes network request
Command and Scripting Interpreter: PowerShell
Sets service image path in registry
Quasar RAT
Quasar family
Quasar 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/4591828804fe213b5d6a005bdcc6d9eecd1f97b6a25eff6e5e951bbabe03f7f6

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:Ezcob
Create hunting rule
Author:Seth Hardy
Description:Ezcob
Rule name:EzcobStrings
Create hunting rule
Author:Seth Hardy
Description:Ezcob Identifying Strings
Rule name:MirrorBlast_Author
Create hunting rule
Author:David Coomber
Description:Detects MirrorBlast samples with Author: Ferop
Reference:https://bazaar.abuse.ch/browse.php?search=tag%3AMirrorBlast
Rule name:vmdetect
Create hunting rule
Author:nex
Description:Possibly employs anti-virtualization techniques

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/38620/

Comments