MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b6a92aac9266f84cded9a49758a8f40221c9d6f424dd6408c83e7d44d548f4ae. 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: 8


Intelligence 8 IOCs YARA 1 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b6a92aac9266f84cded9a49758a8f40221c9d6f424dd6408c83e7d44d548f4ae
SHA3-384 hash: 08fac3027cf995953ded7864801ede05d5ee6818624edb697f437c1e6e67524137e446a9c48fe724383330f9c9402e75
SHA1 hash: 4409a0080e076e663e8da28a02c1e3ced1f39ba9
MD5 hash: 46cb37a9ab59dfa43f3e4412c9482837
humanhash: tango-delta-hotel-arizona
File name:4.vbs
Download: download sample
Signature QuasarRAT
Create hunting rule
File size:279'205 bytes
First seen:2025-01-30 08:54:28 UTC
Last seen:Never
File type:Visual Basic Script (vbs) vbs
MIME type:text/plain
ssdeep 6144:xwP7sgNytypIj9WuIUaZ8z7zC2rPKwBEf+2y/twjgqM5NAq:y7syytHs3UoK2wB++2yu4
TLSH T19E54D164DB182A4937763DBBB08B6230019ECAD3DC5C86FED598A9F85CF3E9943E0145
Magika vba
Reporter JAMESWT_WT
Tags:156-253-250-62 Quasar QuasarRAT vbs

Intelligence

File Origin
# of uploads :
1
# of downloads :
102
Origin country :
IT IT
Vendor Threat Intelligence
Verdict:
Malicious
Score:
94.9%
Link:
https://cyber-fortress.com/docs/result/index.php?id=679b3f4e29ae628cf42b7cd5
Tags:
autorun quasar
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
anti-vm fingerprint monero obfuscated powershell
Link:
https://www.filescan.io/uploads/679b3e6b26e855d1db5309b5/reports/0dd1d443-7f88-4d9c-9ea2-91dcdb268ce9/overview
Verdict:
Unknown
Link:
https://www.hybrid-analysis.com/sample/b6a92aac9266f84cded9a49758a8f40221c9d6f424dd6408c83e7d44d548f4ae
Result
Verdict:
MALICIOUS
Details
Base64 Encoded Powershell Directives
Detected one or more base64 encoded Powershell directives.
Result
Threat name:
Quasar
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1602869
Signature
.NET source code contains a sample name check
.NET source code contains potential unpacker
.NET source code references suspicious native API functions
Bypasses PowerShell execution policy
C2 URLs / IPs found in malware configuration
Detected Quasar RAT
Found malware configuration
Found suspicious powershell code related to unpacking or dynamic code loading
Hides that the sample has been downloaded from the Internet (zone.identifier)
Joe Sandbox ML detected suspicious sample
Loading BitLocker PowerShell Module
Malicious sample detected (through community Yara rule)
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: PowerShell Base64 Encoded Invoke Keyword
Sigma detected: Suspicious PowerShell Parameter Substring
Sigma detected: WScript or CScript Dropper
Suricata IDS alerts for network traffic
Suspicious execution chain found
Suspicious powershell command line found
Uses cmd line tools excessively to alter registry or file data
Uses known network protocols on non-standard ports
VBScript performs obfuscated calls to suspicious functions
Windows Scripting host queries suspicious COM object (likely to drop second stage)
Wscript starts Powershell (via cmd or directly)
Yara detected AntiVM3
Yara detected Generic Downloader
Yara detected Quasar RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1602869 Sample: 4.vbs Startdate: 30/01/2025 Architecture: WINDOWS Score: 100 99 ip-api.com 2->99 101 0x0.st 2->101 109 Suricata IDS alerts for network traffic 2->109 111 Found malware configuration 2->111 113 Malicious sample detected (through community Yara rule) 2->113 115 16 other signatures 2->115 11 wscript.exe 2 2->11         started        15 cmd.exe 2->15         started        17 cmd.exe 2->17         started        19 6 other processes 2->19 signatures3 process4 file5 89 C:\Users\user\AppData\Local\Temp\c.bat, ASCII 11->89 dropped 137 VBScript performs obfuscated calls to suspicious functions 11->137 139 Wscript starts Powershell (via cmd or directly) 11->139 141 Windows Scripting host queries suspicious COM object (likely to drop second stage) 11->141 143 Suspicious execution chain found 11->143 21 cmd.exe 1 11->21         started        24 cmd.exe 15->24         started        26 conhost.exe 15->26         started        28 cmd.exe 17->28         started        30 conhost.exe 17->30         started        145 Loading BitLocker PowerShell Module 19->145 32 conhost.exe 19->32         started        34 conhost.exe 19->34         started        36 conhost.exe 19->36         started        38 3 other processes 19->38 signatures6 process7 signatures8 117 Suspicious powershell command line found 21->117 119 Wscript starts Powershell (via cmd or directly) 21->119 121 Uses cmd line tools excessively to alter registry or file data 21->121 123 Bypasses PowerShell execution policy 21->123 40 cmd.exe 2 21->40         started        43 conhost.exe 21->43         started        45 powershell.exe 24->45         started        47 powershell.exe 24->47         started        49 conhost.exe 24->49         started        51 reg.exe 24->51         started        53 powershell.exe 28->53         started        55 powershell.exe 28->55         started        57 2 other processes 28->57 process9 signatures10 125 Suspicious powershell command line found 40->125 127 Wscript starts Powershell (via cmd or directly) 40->127 129 Uses cmd line tools excessively to alter registry or file data 40->129 59 powershell.exe 40->59         started        63 powershell.exe 14 35 40->63         started        66 conhost.exe 40->66         started        68 reg.exe 40->68         started        131 Detected Quasar RAT 45->131 133 Hides that the sample has been downloaded from the Internet (zone.identifier) 45->133 135 Loading BitLocker PowerShell Module 47->135 70 csc.exe 47->70         started        72 cmstp.exe 47->72         started        74 csc.exe 55->74         started        76 cmstp.exe 55->76         started        process11 dnsIp12 103 ip-api.com 208.95.112.1, 49908, 49990, 49991 TUT-ASUS United States 59->103 105 156.253.250.62, 49820, 49987, 49989 POWERLINE-AS-APPOWERLINEDATACENTERHK Seychelles 59->105 147 Detected Quasar RAT 59->147 149 Found suspicious powershell code related to unpacking or dynamic code loading 59->149 151 Hides that the sample has been downloaded from the Internet (zone.identifier) 59->151 107 0x0.st 168.119.145.117, 443, 49711, 49872 HETZNER-ASDE Germany 63->107 93 C:\Users\user\AppData\...\afomzpnt.cmdline, Unicode 63->93 dropped 153 Loading BitLocker PowerShell Module 63->153 78 csc.exe 3 63->78         started        81 cmstp.exe 8 7 63->81         started        95 C:\Users\user\AppData\Local\...\y2pl0bp4.dll, PE32 70->95 dropped 83 cvtres.exe 70->83         started        97 C:\Users\user\AppData\Local\...\tyyrhhaj.dll, PE32 74->97 dropped 85 cvtres.exe 74->85         started        file13 signatures14 process15 file16 91 C:\Users\user\AppData\Local\...\afomzpnt.dll, PE32 78->91 dropped 87 cvtres.exe 1 78->87         started        process17
Score:
100%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/b6a92aac9266f84cded9a49758a8f40221c9d6f424dd6408c83e7d44d548f4ae
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b6a92aac9266f84cded9a49758a8f40221c9d6f424dd6408c83e7d44d548f4ae/
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=w2usvlesm34ezxwzuslvrkhuaiq4tvxuetowicgihz6ujvki6sxa._file
Result
Malware family:
quasar
Create hunting rule
Score:
  10/10
Tags:
family:quasar discovery execution persistence spyware trojan
Link:
https://tria.ge/reports/250130-kvf9fawpfw/
Behaviour
Kills process with taskkill
Scheduled Task/Job: Scheduled Task
Suspicious behavior: CmdExeWriteProcessMemorySpam
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Drops file in Program Files directory
Drops file in System32 directory
Adds Run key to start application
Looks up external IP address via web service
Checks computer location settings
Executes dropped EXE
Blocklisted process makes network request
Command and Scripting Interpreter: PowerShell
Quasar RAT
Quasar family
Quasar payload
Please note that we are no longer able to provide a coverage score for Virus Total.

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

File information

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

Web download

QuasarRAT

Visual Basic Script (vbs) vbs b6a92aac9266f84cded9a49758a8f40221c9d6f424dd6408c83e7d44d548f4ae

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/3420643/
  
Delivery method
Distributed via web download

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