MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 8d3fde104daed4ea247d38c763872e1617c6d9143f85a657de2c42c7ee17f104. 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


NanoCore


Vendor detections: 8


Intelligence 8 IOCs YARA 11 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 8d3fde104daed4ea247d38c763872e1617c6d9143f85a657de2c42c7ee17f104
SHA3-384 hash: e616e26db83f74345603ba4216fada9a281c85cb1367414eb76927c1bd497b6f193e7606c2568b280a4a51e394711ecd
SHA1 hash: 4ecb8946a937944b20b5536bceb3f40acf0d474a
MD5 hash: a6ac8ad150a8c4781793e73be3fbb121
humanhash: october-lion-grey-lithium
File name:Invoice No B1019855_PDF.vbs
Download: download sample
Signature NanoCore
Create hunting rule
File size:1'735'224 bytes
First seen:2021-05-21 15:36:01 UTC
Last seen:2021-05-21 16:50:18 UTC
File type:Visual Basic Script (vbs) vbs
MIME type:text/plain
ssdeep 24576:NnRRgj4W0oGE7AzM0Ev78hwv22qrC4dzzH6hC5Y3mEabOXDBKu:FReBAzDET8hwGxZCXx
Threatray 5'093 similar samples on MalwareBazaar
TLSH CD85AD318905BD1B8EFF2F46B5502FD33C38257BCF141058E98F09B999682389A7AF64
Reporter abuse_ch
Tags:NanoCore RAT vbs

Intelligence

File Origin
# of uploads :
2
# of downloads :
162
Origin country :
n/a
Vendor Threat Intelligence
Detection(s):
SecuriteInfo.com.Generic-EXE.UNOFFICIAL
Create hunting rule

SecuriteInfo.com.PUA.Base64EXE-2.UNOFFICIAL
Create hunting rule

Result
Verdict:
Clean
Maliciousness:

Behaviour
Creating a window
Sending a UDP request
Result
Verdict:
MALICIOUS
Details
Base64 Encoded URL
Detected an ANSI or UNICODE http:// or https:// base64 encoded URL prefix.
Result
Threat name:
Nanocore AgentTesla
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/787760
Signature
.NET source code contains potential unpacker
.NET source code contains very large array initializations
.NET source code references suspicious native API functions
Benign windows process drops PE files
C2 URLs / IPs found in malware configuration
Detected Nanocore Rat
Found evasive API chain (trying to detect sleep duration tampering with parallel thread)
Found malware configuration
Hides that the sample has been downloaded from the Internet (zone.identifier)
Injects a PE file into a foreign processes
Machine Learning detection for dropped file
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Queries sensitive BIOS Information (via WMI, Win32_Bios & Win32_BaseBoard, often done to detect virtual machines)
Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines)
Queries sensitive video device information (via WMI, Win32_VideoController, often done to detect virtual machines)
Sigma detected: NanoCore
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
VBScript performs obfuscated calls to suspicious functions
Yara detected AgentTesla
Yara detected AntiVM3
Yara detected Nanocore RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 420156 Sample: Invoice No B1019855_PDF.vbs Startdate: 21/05/2021 Architecture: WINDOWS Score: 100 46 sys2021.linkpc.net 2->46 56 Found malware configuration 2->56 58 Malicious sample detected (through community Yara rule) 2->58 60 Multi AV Scanner detection for dropped file 2->60 62 13 other signatures 2->62 9 wscript.exe 3 2->9         started        signatures3 process4 file5 36 C:\Users\user\AppData\Local\Temp\word.exe, PE32 9->36 dropped 38 C:\Users\user\AppData\Local\Temp\opp.exe, PE32 9->38 dropped 66 Benign windows process drops PE files 9->66 68 VBScript performs obfuscated calls to suspicious functions 9->68 13 word.exe 8 9->13         started        17 opp.exe 8 9->17         started        signatures6 process7 file8 40 C:\Users\user\AppData\...\vvUBhTfLzDdyx.exe, PE32 13->40 dropped 42 C:\Users\user\AppData\Local\...\tmp3B96.tmp, XML 13->42 dropped 70 Queries sensitive video device information (via WMI, Win32_VideoController, often done to detect virtual machines) 13->70 72 Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines) 13->72 74 Machine Learning detection for dropped file 13->74 80 3 other signatures 13->80 19 word.exe 4 13->19         started        22 schtasks.exe 1 13->22         started        44 C:\Users\user\AppData\...\QafkeIHoBdA.exe, PE32 17->44 dropped 76 Multi AV Scanner detection for dropped file 17->76 78 Injects a PE file into a foreign processes 17->78 24 opp.exe 8 17->24         started        28 schtasks.exe 1 17->28         started        signatures9 process10 dnsIp11 48 jetport-aero.com 217.182.175.206, 49764, 49768, 49770 OVHFR France 19->48 50 mail.jetport-aero.com 19->50 30 conhost.exe 22->30         started        52 sys2021.linkpc.net 51.210.201.99, 11940, 49731, 49735 OVHFR France 24->52 54 191.96.25.26, 11940, 49739, 49753 AS40676US Chile 24->54 34 C:\Users\user\AppData\Roaming\...\run.dat, data 24->34 dropped 64 Hides that the sample has been downloaded from the Internet (zone.identifier) 24->64 32 conhost.exe 28->32         started        file12 signatures13 process14
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/8d3fde104daed4ea247d38c763872e1617c6d9143f85a657de2c42c7ee17f104/
Threat name:
Script-WScript.Trojan.Heuristic
Create hunting rule
Status:
Malicious
First seen:
2021-05-21 15:36:12 UTC
AV detection:
12 of 47 (25.53%)
Threat level:
  2/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=ru754ecnv3koujd5hddwhbzocyl4nwiuh6c2mv66frbmp3qx6eca._file
Verdict:
malicious
Label(s):
agenttesla
Create hunting rule
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NanoCore
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NanoCore
3ad6ce8aaf456bd0cfd4ea3f7be02d9d08b5e74249e1bb49be61ff58ed61f675
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7f3f988d6ca1f6799c89ed9bdc4e890e0a4b8eb63b08ef424049fdf94514e431
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93bb62774d2359778e34985d5c7fc6be51f91e48706509b8698714f0b5f46a46
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9425a24231d1dad3484de480d65843e7f1b60fd04d753c9f8cb8b093a022e7f2
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NanoCore
+ 5'083 additional samples on MalwareBazaar
Result
Malware family:
nanocore
Create hunting rule
Score:
  10/10
Tags:
family:agenttesla family:nanocore evasion keylogger spyware stealer trojan
Link:
https://tria.ge/reports/210521-tv2glgwkre/
Behaviour
Creates scheduled task(s)
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious behavior: SetClipboardViewer
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Suspicious use of SetThreadContext
Checks whether UAC is enabled
Maps connected drives based on registry
Checks BIOS information in registry
Loads dropped DLL
Reads data files stored by FTP clients
Reads user/profile data of local email clients
Reads user/profile data of web browsers
Executes dropped EXE
Looks for VMWare Tools registry key
AgentTesla Payload
Looks for VirtualBox Guest Additions in registry
AgentTesla
NanoCore
Malware Config
C2 Extraction:
sys2021.linkpc.net:11940
191.96.25.26:11940
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/8d3fde104daed4ea247d38c763872e1617c6d9143f85a657de2c42c7ee17f104

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:ach_AgentTesla_20200929
Create hunting rule
Author:abuse.ch
Description:Detects AgentTesla PE
Rule name:ach_NanoCore
Create hunting rule
Author:abuse.ch
Rule name:MALWARE_Win_AgentTeslaV3
Create hunting rule
Author:ditekSHen
Description:AgentTeslaV3 infostealer payload
Rule name:Nanocore
Create hunting rule
Author:JPCERT/CC Incident Response Group
Description:detect Nanocore in memory
Reference:internal research
Rule name:nanocore_rat
Create hunting rule
Author:jeFF0Falltrades
Rule name:Nanocore_RAT_Feb18_1
Create hunting rule
Author:Florian Roth
Description:Detects Nanocore RAT
Reference:Internal Research - T2T
Rule name:Nanocore_RAT_Gen_2
Create hunting rule
Author:Florian Roth
Description:Detetcs the Nanocore RAT
Reference:https://www.sentinelone.com/blogs/teaching-an-old-rat-new-tricks/
Rule name:pe_imphash
Create hunting rule
Rule name:Skystars_Malware_Imphash
Create hunting rule
Author:Skystars LightDefender
Description:imphash
Rule name:win_agent_tesla_v1
Create hunting rule
Author:Johannes Bader @viql
Description:detects Agent Tesla
Rule name:win_nanocore_w0
Create hunting rule
Author: Kevin Breen <kevin@techanarchy.net>

File information

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

Malspam

NanoCore

Visual Basic Script (vbs) vbs 8d3fde104daed4ea247d38c763872e1617c6d9143f85a657de2c42c7ee17f104

(this sample)

  
Delivery method
Distributed via e-mail attachment

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