MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 d8032c71de22af1a399435b344ca825689ee175529c98fce2529f128f8357dc2. 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: 6


Maldoc score: 3


Intelligence 6 IOCs YARA 7 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: d8032c71de22af1a399435b344ca825689ee175529c98fce2529f128f8357dc2
SHA3-384 hash: 00112edeb254ee7d9bab6c5453a5490dad2ff067b522d84af25a922a3ff7a184501088552b972b5cc75f2256f75c6b81
SHA1 hash: 4f3765768183cbf79e220df9a15ca778c2385b64
MD5 hash: 85a5ea8dcd78a8df15d7e49bb5f22387
humanhash: south-kilo-mars-oregon
File name:OVERDUE INVOICE.xls
Download: download sample
Signature QuasarRAT
Create hunting rule
File size:69'120 bytes
First seen:2020-11-28 07:43:33 UTC
Last seen:2020-11-28 09:55:40 UTC
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 1536:+MnSGiysRchNXHfA1MiWhZFGkEld+Dr7JmSb4wIE7zp0RhBv1hQz7rT01aG:+MnSGiysRchNXHfA1MiWhZFGkEld+Dri
TLSH 7B637D927755C846DA9A033686F3671A7733FC1186F3870F6108F35A5EB3E909A03A67
Reporter abuse_ch
Tags:nVpn QuasarRAT RAT SilentBuilder xls


Avatar
abuse_ch
Malspam distributing QuasarRAT:

HELO: web.buttar.hk
Sending IP: 192.163.248.55
From: Matthew M Stables BSc (Hons) ACIAT <account@j-h-a.co.uk >
Subject: OVERDUE INVOICE
Attachment: OVERDUE INVOICE.xls

QuasarRAT payload URL:
https://cdn.discordapp.com/attachments/776527778357968959/781781579084988447/Veno.exe

QuasarRAT C2:
79.134.225.54:4449

Hosted on nVpn:

% Information related to '79.134.225.0 - 79.134.225.127'

% Abuse contact for '79.134.225.0 - 79.134.225.127' is 'abuse@privacyfirst.sh'

inetnum: 79.134.225.0 - 79.134.225.127
netname: PRIVACYFIRST-EU
country: EU
remarks: This prefix is assigned to The PRIVACYFIRST Project, which
remarks: operates infrastructure jointly used by various VPN service
remarks: providers. We have a very strong focus on privacy and freedom.
remarks: In case of abuse, we encourage all international law enforcement
remarks: agencies to get in touch with our abuse contact. Due to the fact
remarks: that we keep no logs of user activities and only share data when
remarks: it is legally required under our jurisdiction, it is very unlikely
remarks: for a demand of user information to be successful. Still, that
remarks: should not deter you from reaching out.
admin-c: TPP15-RIPE
tech-c: TPP15-RIPE
status: ASSIGNED PA
mnt-by: AF15-MNT
org: ORG-TPP6-RIPE
created: 2020-07-14T15:26:02Z
last-modified: 2020-07-14T15:31:06Z
source: RIPE

Office OLE Information

This malware samples appears to be an Office document. The following table provides more information about this document using oletools and oledump.

OLE id
Maldoc score: 3
Application name is unknown
Office document is in OLE format
OLE dump

MalwareBazaar was able to identify 3 sections in this file using oledump:

Section IDSection sizeSection name
1276 bytesDocumentSummaryInformation
2192 bytesSummaryInformation
365639 bytesWorkbook
OLE vba

MalwareBazaar was able to extract and deobfuscate VBA script(s) the following information from OLE objects embedded in this file using olevba:

TypeKeywordDescription
AutoExecAuto_OpenRuns when the Excel Workbook is opened
IOCpd.batExecutable file name
SuspiciousEXECMay run an executable file or a system

Intelligence

File Origin
# of uploads :
2
# of downloads :
231
Origin country :
n/a
Vendor Threat Intelligence
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Creating a process with a hidden window
Launching a process
DNS request
Sending a custom TCP request
Creating a file
Launching cmd.exe command interpreter by exploiting the app vulnerability
Result
Verdict:
Malicious
File Type:
Legacy Office File
Link:
https://app.docguard.net/d8032c71de22af1a399435b344ca825689ee175529c98fce2529f128f8357dc2/results/dashboard
Payload URLs
URL
File name
https://tinyurl.com/y677kmz8'',''pd.bat''
Macro1
Document image
Image:
Download PNG
Document image
Result
Gathering data
Result
Threat name:
Hidden Macro 4.0 Quasar
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/549899
Signature
.NET source code contains potential unpacker
.NET source code references suspicious native API functions
Binary contains a suspicious time stamp
Connects to a pastebin service (likely for C&C)
Connects to a URL shortener service
Contains functionality to disable the Task Manager (.Net Source)
Document exploit detected (process start blacklist hit)
Drops PE files to the document folder of the user
Found Excel 4.0 Macro with suspicious formulas
Hides that the sample has been downloaded from the Internet (zone.identifier)
Injects a PE file into a foreign processes
Malicious sample detected (through community Yara rule)
May check the online IP address of the machine
Modifies the windows firewall
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Obfuscated command line found
Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Powershell drops PE file
Sigma detected: Microsoft Office Product Spawning Windows Shell
Uses netsh to modify the Windows network and firewall settings
Yara detected hidden Macro 4.0 in Excel
Yara detected Obfuscated Powershell
Yara detected Quasar RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 324064 Sample: OVERDUE INVOICE.xls Startdate: 28/11/2020 Architecture: WINDOWS Score: 100 86 Malicious sample detected (through community Yara rule) 2->86 88 Multi AV Scanner detection for dropped file 2->88 90 Multi AV Scanner detection for submitted file 2->90 92 16 other signatures 2->92 11 EXCEL.EXE 85 29 2->11         started        process3 file4 68 C:\Users\user\Desktop\38DE0000, Applesoft 11->68 dropped 104 Obfuscated command line found 11->104 106 Document exploit detected (process start blacklist hit) 11->106 15 cmd.exe 11->15         started        17 cmd.exe 11->17         started        19 cmd.exe 11->19         started        22 2 other processes 11->22 signatures5 process6 signatures7 24 powershell.exe 7 15->24         started        26 powershell.exe 6 17->26         started        94 Obfuscated command line found 19->94 29 powershell.exe 16 10 19->29         started        33 powershell.exe 7 22->33         started        35 powershell.exe 7 22->35         started        process8 dnsIp9 37 pd.bat 12 24->37         started        100 Drops PE files to the document folder of the user 26->100 102 Powershell drops PE file 26->102 82 tinyurl.com 104.20.138.65, 443, 49165 CLOUDFLARENETUS United States 29->82 84 cdn.discordapp.com 162.159.129.233, 443, 49166 CLOUDFLARENETUS United States 29->84 72 C:\Users\user\Documents\pd.bat, PE32 29->72 dropped 41 attrib.exe 33->41         started        file10 signatures11 process12 dnsIp13 74 hastebin.com 172.67.143.180, 443, 49168 CLOUDFLARENETUS United States 37->74 96 Multi AV Scanner detection for dropped file 37->96 98 Injects a PE file into a foreign processes 37->98 43 pd.bat 1 3 37->43         started        48 timeout.exe 37->48         started        signatures14 process15 dnsIp16 76 ip-api.com 208.95.112.1, 49169, 80 TUT-ASUS United States 43->76 78 pastebin.com 104.23.98.190, 443, 49170 CLOUDFLARENETUS United States 43->78 80 www.minpic.net 172.67.164.133, 443, 49171 CLOUDFLARENETUS United States 43->80 70 C:\Users\user\AppData\Roaming\Venom.exe, PE32 43->70 dropped 108 Hides that the sample has been downloaded from the Internet (zone.identifier) 43->108 50 cmd.exe 43->50         started        52 cmd.exe 43->52         started        54 cmd.exe 43->54         started        56 3 other processes 43->56 file17 signatures18 process19 process20 58 netsh.exe 50->58         started        60 netsh.exe 52->60         started        62 netsh.exe 54->62         started        64 netsh.exe 56->64         started        66 netsh.exe 56->66         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/d8032c71de22af1a399435b344ca825689ee175529c98fce2529f128f8357dc2/
Threat name:
Document-Word.Trojan.Abracadabra
Create hunting rule
Status:
Malicious
First seen:
2020-11-28 07:44:09 UTC
File Type:
Document
Extracted files:
8
AV detection:
11 of 48 (22.92%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=3absy4o6ekxruomugwzujsuck2e64f2vfhey7trffhysr6bvpxba._file
Result
Malware family:
n/a
Score:
  10/10
Tags:
evasion macro
Link:
https://tria.ge/reports/201128-ntb4etds3n/
Behaviour
Delays execution with timeout.exe
Enumerates system info in registry
Modifies Internet Explorer settings
Modifies registry class
Modifies system certificate store
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Views/modifies file attributes
Checks processor information in registry
Suspicious use of SetThreadContext
Legitimate hosting services abused for malware hosting/C2
Looks up external IP address via web service
Loads dropped DLL
Blacklisted process makes network request
Executes dropped EXE
Modifies Windows Firewall
Sets file to hidden
Process spawned unexpected child process
Malware Config
Dropper Extraction:
https://tinyurl.com/y677kmz8
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:Email_stealer_bin_mem
Create hunting rule
Author:James_inthe_box
Description:Email in files like avemaria
Rule name:IPPort_combo_mem
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:Select_from_enumeration
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:SharedStrings
Create hunting rule
Author:Katie Kleemola
Description:Internal names found in LURK0/CCTV0 samples
Rule name:SUSP_Excel4Macro_AutoOpen
Create hunting rule
Author:John Lambert @JohnLaTwC
Description:Detects Excel4 macro use with auto open / close
Rule name:SUSP_PowerShell_Caret_Obfuscation_2
Create hunting rule
Author:Florian Roth
Description:Detects powershell keyword obfuscated with carets
Reference:Internal Research
Rule name:UAC_bypass_bin_mem
Create hunting rule
Author:James_inthe_box
Description:UAC bypass in files like avemaria

File information

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

Malspam

QuasarRAT

Excel file xls d8032c71de22af1a399435b344ca825689ee175529c98fce2529f128f8357dc2

(this sample)

  
Delivery method
Distributed via e-mail attachment

Comments