MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 761e77be2bbf6089f04b1901c44548bd4ff5ac873a74b1ca0e0604bb902eff22. 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: 10


Intelligence 10 IOCs YARA 6 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 761e77be2bbf6089f04b1901c44548bd4ff5ac873a74b1ca0e0604bb902eff22
SHA3-384 hash: d59db24bf28ea3ec49a56bb6f0b1d01ca89af5ca268ab4375627a7b8d21f0bd3a6fb70201cf3b6cb68d58e224d62ad69
SHA1 hash: 1153f298db7e6aeed9c3a55c907dfa474ae9155f
MD5 hash: d90049e2aff303588e499820e0d9078c
humanhash: tennis-sweet-one-steak
File name:PO#4018-308875.pdf.exe
Download: download sample
Signature NanoCore
Create hunting rule
File size:783'360 bytes
First seen:2021-01-20 06:28:07 UTC
Last seen:2021-01-20 14:44:14 UTC
File type:Executable exe
MIME type:application/x-dosexec
imphash f34d5f2d4577ed6d9ceec516c1f5a744 (48'652 x AgentTesla, 19'463 x Formbook, 12'204 x SnakeKeylogger)
ssdeep 12288:NAagt50jwcEc6tvHpTkJ23d9ZSn9V9ovGPfiu:N3i08cEc6tvHpAIZSnb+vGXi
Threatray 251 similar samples on MalwareBazaar
TLSH 90F4E164B78ACEB2D09C393F419F183883D3DECBE782D1971A597EB606350D05E4E899
Reporter abuse_ch
Tags:exe NanoCore RAT


Avatar
abuse_ch
Malspam distributing NanoCore:

HELO: bornsun.com
Sending IP: 144.208.127.214
From: 业务部（外）-罗秀兰 <sales312@bornsun.com>
Subject: Carlos Valdez Mato PO#4018-308875
Attachment: PO4018-308875.pdf.rar (contains "PO#4018-308875.pdf.exe")

NanoCore RAT C2:
fenixalec.ddns.net

Intelligence

File Origin
# of uploads :
2
# of downloads :
179
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
PO#4018-308875.pdf.exe
Verdict:
Malicious activity
Analysis date:
2021-01-20 06:31:31 UTC
Tags:
rat nanocore
Link:
https://app.any.run/tasks/fc1d184d-bd4e-4b6e-bb4e-fcb683b6b2f3

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/113016/
Detection(s):
SecuriteInfo.com.BehavesLike.Win32.Generic.bm.30835.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Running batch commands
Launching a process
Sending a UDP request
Creating a file in the %temp% directory
Creating a file in the %AppData% directory
Creating a process from a recently created file
Creating a file
Enabling autorun with the standard Software\Microsoft\Windows\CurrentVersion\Run registry branch
Unauthorized injection to a recently created process
Result
Verdict:
UNKNOWN
Details
Windows PE Executable
Found a Windows Portable Executable (PE) binary. Depending on context, the presence of a binary is suspicious or malicious.
Result
Threat name:
Nanocore
Create hunting rule
Detection:
malicious
Classification:
troj.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/585788
Signature
.NET source code contains very large array initializations
Allocates memory in foreign processes
C2 URLs / IPs found in malware configuration
Detected Nanocore Rat
Found malware configuration
Hides that the sample has been downloaded from the Internet (zone.identifier)
Initial sample is a PE file and has a suspicious name
Injects a PE file into a foreign processes
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Sigma detected: NanoCore
Uses an obfuscated file name to hide its real file extension (double extension)
Uses dynamic DNS services
Writes to foreign memory regions
Yara detected Nanocore RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 341926 Sample: PO#4018-308875.pdf.exe Startdate: 20/01/2021 Architecture: WINDOWS Score: 100 39 fenixalec.ddns.net 2->39 41 Found malware configuration 2->41 43 Malicious sample detected (through community Yara rule) 2->43 45 Multi AV Scanner detection for submitted file 2->45 47 8 other signatures 2->47 8 PO#4018-308875.pdf.exe 5 2->8         started        signatures3 process4 file5 27 C:\Users\user\AppData\Roaming\gfrdeswaq.exe, PE32 8->27 dropped 29 C:\Users\user\AppData\...\InstallUtil.exe, PE32 8->29 dropped 31 C:\Users\...\gfrdeswaq.exe:Zone.Identifier, ASCII 8->31 dropped 33 C:\Users\user\...\PO#4018-308875.pdf.exe.log, ASCII 8->33 dropped 49 Hides that the sample has been downloaded from the Internet (zone.identifier) 8->49 12 gfrdeswaq.exe 2 8->12         started        15 cmd.exe 1 8->15         started        signatures6 process7 signatures8 51 Multi AV Scanner detection for dropped file 12->51 53 Writes to foreign memory regions 12->53 55 Allocates memory in foreign processes 12->55 57 2 other signatures 12->57 17 InstallUtil.exe 6 12->17         started        21 conhost.exe 15->21         started        23 reg.exe 1 1 15->23         started        process9 dnsIp10 35 fenixalec.ddns.net 185.162.88.26, 20911, 49729, 49730 AS40676US Netherlands 17->35 37 192.168.2.1 unknown unknown 17->37 25 C:\Users\user\AppData\Roaming\...\run.dat, data 17->25 dropped file11
Detection:
nanocore
Create hunting rule
Link:
https://mwdb.cert.pl/sample/761e77be2bbf6089f04b1901c44548bd4ff5ac873a74b1ca0e0604bb902eff22/
Threat name:
Win32.Trojan.Wacatac
Create hunting rule
Status:
Malicious
First seen:
2021-01-20 00:38:50 UTC
AV detection:
7 of 46 (15.22%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=oyphpprlx5qit4cldea4irkixvh7llehhj2ldsqoayclxebo74ra._file
Verdict:
unknown
Similar samples:
18da6bd51f14bd9ffca136121586de47bad598fb4652f9a48044290377fcec61
NanoCore
1cc6b22673f09ee5dd4fa5b54b0244ab8f81ad0064e900d211f62890263a5ab7
NanoCore
37965f22c013912043bab3cb214f8219ba54e3c3570132985fc37be5a9e4ba49
NanoCore
38c0ef7726c130542c9ee9f048704a0576df466bb03168aad7d71654a399b3e4
NanoCore
3d402a866fb1dc18d7eaaa64013502d3184c25b9f5c93bfa916b5d15cda34a11
NanoCore
5da82dd52f913ff5d416ec5479133a0f89cd5d835d2fbd964f32191f642ca9fa
NanoCore
7862be8b6b58fc073c3b91badfeab7f5d939725074f2022be9430f89c594692d
NanoCore
c960f47eb155a0066c0e4e279c296d0516edf66cf032b44188fe3d7f3a16aef6
NanoCore
d659838fb0e082657316694b3c5fa5b1664968b441d84fa60c3f6ed029e85a3f
NanoCore
e2d112bd0fd186acce6eebc6ec5d389c69fd6ae1154d0f44938de68dedec29cc
NanoCore
+ 241 additional samples on MalwareBazaar
Result
Malware family:
nanocore
Create hunting rule
Score:
  10/10
Tags:
family:nanocore evasion keylogger persistence spyware stealer trojan
Link:
https://tria.ge/reports/210120-jgn86qtkmj/
Behaviour
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: GetForegroundWindowSpam
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Suspicious use of SetThreadContext
Adds Run key to start application
Checks whether UAC is enabled
Loads dropped DLL
Executes dropped EXE
NanoCore
Malware Config
C2 Extraction:
185.162.88.26:20911
fenixalec.ddns.net:20911
Unpacked files
SH256 hash:
a60900adc31e8e28ff541b91a55de5d9719c0d1ddc3022eb6f6fb5ac19cc9e4f
MD5 hash:
831fb0609b3509b4fb31ac662ac69217
SHA1 hash:
985c33fa2b01e305995e2ea166b961b01f0f6335
Link:
https://www.unpac.me/results/4f4381a6-6dca-404a-a2ad-a0e7136ae79b/
SH256 hash:
4f81e273da20c5b9835ce6ca57cc061d77764f9e3927bdb1505cb791bf50b046
MD5 hash:
29e19b5dce96140a8b90152b16bd44af
SHA1 hash:
4f3dc6eb876bb58f53966980a9c451a04ec17d8a
Link:
https://www.unpac.me/results/4f4381a6-6dca-404a-a2ad-a0e7136ae79b/
SH256 hash:
4fbb56f5dc4e483df10bcd44d45bac4db5577be7ddf20a4e6c7957a5b271f0af
MD5 hash:
7f0eaa932643cecaa67e3cc6ed800ed6
SHA1 hash:
123360e62fb1d1e9e9f64b742cc2240041294752
Detections:
win_nanocore_w0
Create hunting rule
Link:
https://www.unpac.me/results/4f4381a6-6dca-404a-a2ad-a0e7136ae79b/
Parent samples :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 hash:
761e77be2bbf6089f04b1901c44548bd4ff5ac873a74b1ca0e0604bb902eff22
MD5 hash:
d90049e2aff303588e499820e0d9078c
SHA1 hash:
1153f298db7e6aeed9c3a55c907dfa474ae9155f
Link:
https://www.unpac.me/results/4f4381a6-6dca-404a-a2ad-a0e7136ae79b/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Kryptik
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/761e77be2bbf6089f04b1901c44548bd4ff5ac873a74b1ca0e0604bb902eff22

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_NanoCore
Create hunting rule
Author:abuse.ch
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: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

rar aeaa56570bab1ee316473fe8a369c8ef41ed7a99fcedcea58dde547ab57835fd

NanoCore

Executable exe 761e77be2bbf6089f04b1901c44548bd4ff5ac873a74b1ca0e0604bb902eff22

(this sample)

  
Dropped by
MD5 4bfa0fc9c27b6367003681a0eaefc482
  
Delivery method
Distributed via e-mail attachment
  
Dropped by
SHA256 aeaa56570bab1ee316473fe8a369c8ef41ed7a99fcedcea58dde547ab57835fd
Cape
Cape
https://www.capesandbox.com/analysis/113016/

Comments