MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 fff8ec58e389bfcec03ca66fe8bee39b849a948174472de91eb160ae35b78365. 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: 14


Intelligence 14 IOCs YARA 4 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: fff8ec58e389bfcec03ca66fe8bee39b849a948174472de91eb160ae35b78365
SHA3-384 hash: 83d55e3b6b244d2e614f3f6531cc13d98cb1fe16c4cb287c27cb670c445c63cb9a2037dece94ea567b093cb759c78ecf
SHA1 hash: 2c7d41e4a8d05d7ceffaaabbc3032532e195b569
MD5 hash: 6e80f1ff721d8c1bbae10cafca6070e5
humanhash: oscar-bulldog-yankee-angel
File name:1.bat
Download: download sample
Signature QuasarRAT
Create hunting rule
File size:4'350'326 bytes
First seen:2026-02-04 10:27:30 UTC
Last seen:Never
File type:Batch (bat) bat
MIME type:text/x-msdos-batch
ssdeep 24576:3XYSse6R2smZhoAZSxU3CMdXEzFxYih8nbtG1yZxbwb3L/5MNIQv/Ly+iJvhKv72:32s350FN4tVpfL8ZEE
Threatray 87 similar samples on MalwareBazaar
TLSH T1F916B0F33495B994CDEEE65F865F8728732A1282B713118C179F0E94CB2394F7B8458A
Magika batch
Reporter abuse_ch
Tags:bat QuasarRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
41
Origin country :
SE SE
Vendor Threat Intelligence
No detections
Malware family:
agenttesla
Create hunting rule
ID:
1
File name:
1.bat
Verdict:
Malicious activity
Analysis date:
2026-02-04 10:31:07 UTC
Tags:
vbatloader loader auto-reg keylogger agenttesla susp-powershell evasion
Link:
https://app.any.run/tasks/64303fb1-6330-4cc1-9c58-abc59f15a5bf

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/51651/
Verdict:
Malicious
Score:
99.9%
Link:
https://cyber-fortress.com/docs/result/index.php?id=69831f836b1af47db72cb69c
Tags:
ransomware dropper emotet sage
Verdict:
Malicious
Labled as:
Trojan.Generic
Link:
https://www.hybrid-analysis.com/sample/fff8ec58e389bfcec03ca66fe8bee39b849a948174472de91eb160ae35b78365
Result
Gathering data
Verdict:
Malicious
File Type:
unix shell
First seen:
2026-01-27T10:25:00Z UTC
Last seen:
2026-01-27T12:38:00Z UTC
Hits:
~10
Link:
https://opentip.kaspersky.com/fff8ec58e389bfcec03ca66fe8bee39b849a948174472de91eb160ae35b78365/results?tab=lookup
Result
Threat name:
DonutLoader
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1863171
Signature
.NET source code contains potential unpacker
Benign windows process drops PE files
Bypasses PowerShell execution policy
Creates a thread in another existing process (thread injection)
Encrypted powershell cmdline option found
Found large BAT file
Found suspicious powershell code related to unpacking or dynamic code loading
Hides that the sample has been downloaded from the Internet (zone.identifier)
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)
Multi AV Scanner detection for submitted file
Sigma detected: Base64 Encoded PowerShell Command Detected
Sigma detected: Dot net compiler compiles file from suspicious location
Sigma detected: PowerShell Base64 Encoded FromBase64String Cmdlet
Sigma detected: Script Interpreter Execution From Suspicious Folder
Sigma detected: Suspicious Script Execution From Temp Folder
Suricata IDS alerts for network traffic
Suspicious powershell command line found
System process connects to network (likely due to code injection or exploit)
Unusual module load detection (module proxying)
Uses cmd line tools excessively to alter registry or file data
Writes to foreign memory regions
Yara detected DonutLoader
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1863171 Sample: 1.bat Startdate: 04/02/2026 Architecture: WINDOWS Score: 100 74 ipwho.is 2->74 86 Suricata IDS alerts for network traffic 2->86 88 Malicious sample detected (through community Yara rule) 2->88 90 Multi AV Scanner detection for submitted file 2->90 92 10 other signatures 2->92 10 cmd.exe 1 2->10         started        13 cmd.exe 1 2->13         started        15 cmd.exe 2->15         started        signatures3 process4 signatures5 102 Suspicious powershell command line found 10->102 104 Uses cmd line tools excessively to alter registry or file data 10->104 106 Encrypted powershell cmdline option found 10->106 108 Bypasses PowerShell execution policy 10->108 17 cmd.exe 4 10->17         started        21 conhost.exe 10->21         started        23 cmd.exe 1 13->23         started        25 conhost.exe 13->25         started        27 cmd.exe 15->27         started        29 conhost.exe 15->29         started        process6 file7 60 C:\Users\user\...\q0n0MdMdlwoPhNsu.bat, DOS 17->60 dropped 80 Suspicious powershell command line found 17->80 82 Uses cmd line tools excessively to alter registry or file data 17->82 84 Encrypted powershell cmdline option found 17->84 31 powershell.exe 23 17->31         started        34 powershell.exe 11 17->34         started        36 powershell.exe 16 17->36         started        45 3 other processes 17->45 39 powershell.exe 15 23->39         started        41 conhost.exe 23->41         started        47 2 other processes 23->47 43 conhost.exe 27->43         started        49 3 other processes 27->49 signatures8 process9 file10 110 Injects code into the Windows Explorer (explorer.exe) 31->110 112 Writes to foreign memory regions 31->112 114 Creates a thread in another existing process (thread injection) 31->114 51 explorer.exe 33 29 31->51 injected 56 csc.exe 3 31->56         started        116 Found suspicious powershell code related to unpacking or dynamic code loading 34->116 62 C:\Users\user\AppData\...\ps_gU1uU6JG.ps1, Unicode 36->62 dropped signatures11 process12 dnsIp13 76 31.57.219.219, 49700, 5001 RASANAIR Iran (ISLAMIC Republic Of) 51->76 78 ipwho.is 199.71.214.57, 443, 49701 AS40676US United States 51->78 64 C:\Users\user\AppData\Roaming\...\SharpDX.dll, PE32 51->64 dropped 66 C:\Users\user\...\SharpDX.Mathematics.dll, PE32 51->66 dropped 68 C:\Users\user\...\SharpDX.Direct3D11.dll, PE32 51->68 dropped 72 11 other files (none is malicious) 51->72 dropped 94 System process connects to network (likely due to code injection or exploit) 51->94 96 Benign windows process drops PE files 51->96 98 Hides that the sample has been downloaded from the Internet (zone.identifier) 51->98 100 Unusual module load detection (module proxying) 51->100 70 C:\Users\user\AppData\Local\...\bzculsy5.dll, PE32 56->70 dropped 58 cvtres.exe 1 56->58         started        file14 signatures15 process16
Score:
100%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/fff8ec58e389bfcec03ca66fe8bee39b849a948174472de91eb160ae35b78365
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/fff8ec58e389bfcec03ca66fe8bee39b849a948174472de91eb160ae35b78365/
Verdict:
Malicious
Threat:
Backdoor.Win32.PulsarRAT
Link:
https://tip.neiki.dev/file/fff8ec58e389bfcec03ca66fe8bee39b849a948174472de91eb160ae35b78365
Threat name:
Script-BAT.Trojan.Heuristic
Create hunting rule
Status:
Malicious
First seen:
2026-01-26 23:28:30 UTC
File Type:
Text (Batch)
AV detection:
10 of 36 (27.78%)
Threat level:
  2/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=774oywhdrg745qb4uzx6rpxdtocjvfebords32i6wfqk4nnxqnsq._file
Verdict:
malicious
Label(s):
donutloader
Create hunting rule
quasarrat
Create hunting rule
Similar samples:
0455ebce0a62e2413a730a8e172cde5e6171d2a3569c4620c7e10a6ff04a3710
QuasarRAT
0a2c887c8a3b30519f8c1750b8eba2df2ede2710b1fbb71f26c2acff3ececff8
QuasarRAT
2ad6a919f8256c9100324af50c0894527bb71f344ecdfe1e1f00b4e708ff8481
QuasarRAT
4028e49df6c5bb6f0610b22406d5457aa906382dbb29e6db46757985c1340511
QuasarRAT
8385f3cc2b7ba194f3abb756f95f20b6610f6840034f312683ff4914fdfaced6
QuasarRAT
8b285bfafb3e876e29f04165896276d17f0998e2b02f97c90a28c34ab53ee866
QuasarRAT
9250584a4878cae6188ba7eafa667e4612afbfb89e2698bbc5ceb7fa17cddc08
QuasarRAT
d797019b2ff011ae71e9e700e8f9a16cb463af646aae4815654ae79e09f59ceb
QuasarRAT
e27288fcd6c3ccbadf90d37481ff6b407e31eeb33f775e5110be3e75401879b9
QuasarRAT
error
QuasarRAT
+ 77 additional samples on MalwareBazaar
Result
Malware family:
quasar
Create hunting rule
Score:
  10/10
Tags:
family:donutloader family:quasar defense_evasion execution loader persistence spyware trojan
Link:
https://tria.ge/reports/260204-mhqy8adz6e/
Behaviour
NTFS ADS
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious use of AdjustPrivilegeToken
Suspicious use of UnmapMainImage
Suspicious use of WriteProcessMemory
Views/modifies file attributes
Adds Run key to start application
Command and Scripting Interpreter: PowerShell
Detects DonutLoader
DonutLoader
Donutloader family
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/fff8ec58e389bfcec03ca66fe8bee39b849a948174472de91eb160ae35b78365

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:Base64_Encoded_Powershell_Directives
Create hunting rule
Rule name:Disable_Defender
Create hunting rule
Author:iam-py-test
Description:Detect files disabling or modifying Windows Defender, Windows Firewall, or Microsoft Smartscreen
Rule name:SUSP_Base64
Create hunting rule
Author:Eslam Hassan
Description:Detects hex encoded code that has been base64 encoded
Reference:Internal Research
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)

File information

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

Web download

QuasarRAT

Batch (bat) bat fff8ec58e389bfcec03ca66fe8bee39b849a948174472de91eb160ae35b78365

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/3770995/
  
Delivery method
Distributed via web download
Cape
Cape
https://www.capesandbox.com/analysis/51651/

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