MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 e58d43d6c26604984dce363a2ffe11c9162e58666f02041df046663554dee403. 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 3 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: e58d43d6c26604984dce363a2ffe11c9162e58666f02041df046663554dee403
SHA3-384 hash: 97c65160f36fa2df8e841cab2a2effceeb68c3054fb2a69425b48122c83bc40fbc4d319500b62d11160aa79be73411b2
SHA1 hash: 8733b861014f74afbec927bca7a1c2f57cf7989b
MD5 hash: 5255b3dd53921bebbbf3464f36d9a34d
humanhash: sierra-massachusetts-king-mexico
File name:SD237687289.doc
Download: download sample
Signature NanoCore
Create hunting rule
File size:87'371 bytes
First seen:2023-11-26 14:15:08 UTC
Last seen:Never
File type:Word file doc
MIME type:text/plain
ssdeep 768:aKwAbZSibMX9gRWjkJkdhJTSSxHaGaWYtdIKvX:aKwAlR5iZSKKh6kX
TLSH T1A083CD6CD78F01A98F6253369B2B0E8441BCBA6EF34052B5305C937533E9D3DA2256BD
Reporter Xev
Tags:AgentTesla CVE-2017-11882 doc Downloader Exploit.MSOffice NanoCore rtf


Avatar
NIXLovesCooper
NanoCore, AgentTesla, Andromeda payload: http://zang1.almashreaq.top/_errorpages/plugmanzx.exe

Intelligence

File Origin
# of uploads :
1
# of downloads :
395
Origin country :
GR GR
Vendor Threat Intelligence
Verdict:
Legit
File type:
application/msword
Has a screenshot:
False
Contains macros:
False
Detection(s):
SecuriteInfo.com.Spam-473.UNOFFICIAL
Create hunting rule

Sanesecurity.Malware.27333.RtfHeur.BadVer.UNOFFICIAL
Create hunting rule

SecuriteInfo.com.FakeRTF-1.UNOFFICIAL
Create hunting rule

Sanesecurity.Malware.26244.RtfHeur.UNOFFICIAL
Create hunting rule

Sanesecurity.Shelter.Malware.BadRtf.ObjUpd.UNOFFICIAL
Create hunting rule

MiscreantPunch.RTF.EvilRTF.CVE-2017-0199-Obfus.UNOFFICIAL
Create hunting rule

MiscreantPunch.EvilRTF.CommonLure.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.RTFFakeVersionWithObjUpdateUKSurfMix.20200514.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.RoomService.20230808.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for synchronization primitives
Sending a custom TCP request
Launching a process
Creating a window
Creating a file in the %AppData% directory
Сreating synchronization primitives
Query of malicious DNS domain
Sending an HTTP GET request to an infection source by exploiting the app vulnerability
Creating a process from a recently created file
Result
Verdict:
Malicious
File Type:
Fake RTF File
Link:
https://app.docguard.net/e58d43d6c26604984dce363a2ffe11c9162e58666f02041df046663554dee403/results/dashboard
Behaviour
BlacklistAPI detected
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Link:
https://www.filescan.io/uploads/65635324bcca970107cd2c2e/reports/e28822c7-7800-4afd-b07a-82320415f782/overview
Verdict:
Unknown
Link:
https://www.hybrid-analysis.com/sample/e58d43d6c26604984dce363a2ffe11c9162e58666f02041df046663554dee403
Result
Verdict:
MALICIOUS
Result
Threat name:
Nanocore
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1347954
Signature
.NET source code contains potential unpacker
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Antivirus detection for URL or domain
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 an obfuscated RTF file
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 domain / URL
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Office equation editor drops PE file
Office equation editor establishes network connection
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Sigma detected: EQNEDT32.EXE connecting to internet
Sigma detected: File Dropped By EQNEDT32EXE
Sigma detected: NanoCore
Sigma detected: Scheduled temp file as task from temp location
Snort IDS alert for network traffic
Uses schtasks.exe or at.exe to add and modify task schedules
Yara detected Nanocore RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 1347954 Sample: SD237687289.doc Startdate: 26/11/2023 Architecture: WINDOWS Score: 100 59 Initial sample is an obfuscated RTF file 2->59 61 Snort IDS alert for network traffic 2->61 63 Multi AV Scanner detection for domain / URL 2->63 65 18 other signatures 2->65 8 EQNEDT32.EXE 11 2->8         started        13 taskeng.exe 1 2->13         started        15 smtpsvc.exe 2->15         started        17 WINWORD.EXE 291 16 2->17         started        process3 dnsIp4 53 zang1.almashreaq.top 172.67.221.26, 49161, 80 CLOUDFLARENETUS United States 8->53 43 C:\Users\user\AppData\...\plugman2485.exe, PE32 8->43 dropped 45 C:\Users\user\AppData\...\plugmanzx[1].exe, PE32 8->45 dropped 77 Office equation editor establishes network connection 8->77 79 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 8->79 19 plugman2485.exe 1 7 8->19         started        22 smtpsvc.exe 2 13->22         started        24 plugman2485.exe 2 13->24         started        81 Injects a PE file into a foreign processes 15->81 26 smtpsvc.exe 15->26         started        file5 signatures6 process7 signatures8 67 Antivirus detection for dropped file 19->67 69 Multi AV Scanner detection for dropped file 19->69 71 Detected Nanocore Rat 19->71 75 2 other signatures 19->75 28 plugman2485.exe 1 11 19->28         started        73 Injects a PE file into a foreign processes 22->73 33 smtpsvc.exe 22->33         started        35 smtpsvc.exe 22->35         started        37 plugman2485.exe 2 24->37         started        process9 dnsIp10 55 127.0.0.1 unknown unknown 28->55 57 6coinc.zapto.org 28->57 47 C:\Program Files (x86)\...\smtpsvc.exe, PE32 28->47 dropped 49 C:\Users\user\AppData\Roaming\...\run.dat, Non-ISO 28->49 dropped 51 C:\Users\user\AppData\Local\...\tmp540A.tmp, XML 28->51 dropped 83 Detected Nanocore Rat 28->83 85 Hides that the sample has been downloaded from the Internet (zone.identifier) 28->85 39 schtasks.exe 28->39         started        41 schtasks.exe 28->41         started        file11 signatures12 process13
Score:
99%
Verdict:
Malware
File Type:
ASCII
Link:
https://malprob.io/report/e58d43d6c26604984dce363a2ffe11c9162e58666f02041df046663554dee403
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/e58d43d6c26604984dce363a2ffe11c9162e58666f02041df046663554dee403/
Threat name:
Document-RTF.Exploit.CVE-2017-11882
Create hunting rule
Status:
Malicious
First seen:
2023-11-20 00:35:57 UTC
File Type:
Document
Extracted files:
4
AV detection:
19 of 37 (51.35%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=4wguhvwcmycjqtoogy5c77qrzelc4wdgn4baihpqiztdkvg64qbq._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
n/a
Link:
https://tria.ge/reports/231126-sj14gaab22/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Launches Equation Editor
Modifies Internet Explorer settings
Modifies registry class
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Office loads VBA resources, possible macro or embedded object present
Drops file in Windows directory
Executes dropped EXE
Loads dropped DLL
Blocklisted process makes network request
Downloads MZ/PE file
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Nanocore
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/e58d43d6c26604984dce363a2ffe11c9162e58666f02041df046663554dee403

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:INDICATOR_RTF_MalVer_Objects
Create hunting rule
Author:ditekSHen
Description:Detects RTF documents with non-standard version and embeding one of the object mostly observed in exploit documents.
Rule name:SUSP_INDICATOR_RTF_MalVer_Objects
Create hunting rule
Author:ditekSHen
Description:Detects RTF documents with non-standard version and embedding one of the object mostly observed in exploit (e.g. CVE-2017-11882) documents.
Reference:https://github.com/ditekshen/detection
Rule name:SUSP_RTF_Header_Anomaly_RID2F7F
Create hunting rule
Author:Florian Roth
Description:Detects malformed RTF header often used to trick mechanisms that check for a full RTF header
Reference:https://twitter.com/ItsReallyNick/status/975705759618158593

File information

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

Malspam

NanoCore

Word file doc e58d43d6c26604984dce363a2ffe11c9162e58666f02041df046663554dee403

(this sample)

NanoCore

Executable exe 874f9ec9a67d5ecb2c131a9aa0c4738af6bc7be28dae7b47c797d8eecdd9961a

  
Delivery method
Distributed via e-mail attachment
  
Dropping
SHA256 874f9ec9a67d5ecb2c131a9aa0c4738af6bc7be28dae7b47c797d8eecdd9961a
  
Dropping
MD5 d58652b6bd76ac545da4b9dd4f70e032

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