MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 d483c4f1670ea7a69f9cdbbf716e67f1511e271d485229566afaa67011304dd6. 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


RemcosRAT


Vendor detections: 13


Intelligence 13 IOCs YARA 3 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: d483c4f1670ea7a69f9cdbbf716e67f1511e271d485229566afaa67011304dd6
SHA3-384 hash: 0a038864b7d470568ffa89ce2e6c6a54ef0c10c2960629881c95e5410199fe7a721acf04dd706c49a5e4769c4dc0cafd
SHA1 hash: 40dd20643ba58bb81a27c3be4c37c84cc6a2ce6f
MD5 hash: 42d3837bf1dc78a79c488153d7ff0ca9
humanhash: artist-video-bacon-yankee
File name:RFQ-000753.xla
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:63'488 bytes
First seen:2024-03-21 08:23:04 UTC
Last seen:2024-03-21 10:26:47 UTC
File type:Excel file xlsx
MIME type:application/vnd.ms-excel
ssdeep 768:UyBP0/+sG1tzXyBP0nApAEhJrOawVkC43+1eaIqnxMsijgO4E9XFzd:U68/pG1tzX68ApAEzrOawaaZus04E9
TLSH T1A553D01A7224E428C173593E4DCDC1EB73243D725D16E70BB6807B1D6C762C28B17B9A
TrID 46.5% (.XLS) Microsoft Excel sheet (alternate) (56500/1/4)
26.7% (.XLS) Microsoft Excel sheet (32500/1/3)
20.1% (.XLS) Microsoft Excel sheet (alternate) (24500/1/2)
6.5% (.) Generic OLE2 / Multistream Compound (8000/1)
Reporter lowmal3
Tags:RemcosRAT xlsx

Intelligence

File Origin
# of uploads :
2
# of downloads :
534
Origin country :
DE DE
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
42d3837bf1dc78a79c488153d7ff0ca9.xls
Verdict:
Malicious activity
Analysis date:
2024-03-21 01:04:12 UTC
Tags:
exploit cve-2017-11882
Link:
https://app.any.run/tasks/7d45dc68-ad88-4980-9186-ae330b98eb5f

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Legit
File type:
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Has a screenshot:
False
Contains macros:
False
Detection(s):
Sanesecurity.Badmacro.Xls.VB.Redir1.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Changing an executable file
Using the Windows Management Instrumentation requests
Creating a window
DNS request
Sending an HTTP GET request
Searching for synchronization primitives
Launching a process
Сreating synchronization primitives
Connection attempt by exploiting the app vulnerability
Launching a process by exploiting the app vulnerability
Result
Verdict:
Malicious
File Type:
Legacy Excel File with Macro
Link:
https://app.docguard.net/d483c4f1670ea7a69f9cdbbf716e67f1511e271d485229566afaa67011304dd6/results/dashboard
Payload URLs
URL
File name
http://qly.ai/V5LvD
Embedded Ole
Behaviour
SuspiciousRTF detected
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
88%
Tags:
macros masquerade sload
Link:
https://www.filescan.io/uploads/65fbeea7757c624818b4f8bd/reports/ac5948b9-8bba-4cfd-ac9d-c71c4286d41a/overview
Verdict:
Unknown
Link:
https://www.hybrid-analysis.com/sample/d483c4f1670ea7a69f9cdbbf716e67f1511e271d485229566afaa67011304dd6
Label:
Benign
Suspicious Score:
3.2/10
Score Malicious:
33%
Score Benign:
67%
Link:
https://www.malware.ai/gui/files/?id=1538fa49-14f9-4802-bd5c-bc8f0379322e
Result
Threat name:
n/a
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1413036
Signature
Antivirus detection for dropped file
Connects to a pastebin service (likely for C&C)
Document exploit detected (process start blacklist hit)
Excel sheet contains many unusual embedded objects
Installs new ROOT certificates
Malicious sample detected (through community Yara rule)
Microsoft Office drops suspicious files
Microsoft Office launches external ms-search protocol handler (WebDAV)
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for submitted file
Office drops RTF file
Office equation editor establishes network connection
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Office viewer loads remote template
Shellcode detected
Sigma detected: EQNEDT32.EXE connecting to internet
Sigma detected: Equation Editor Network Connection
Sigma detected: File Dropped By EQNEDT32EXE
Sigma detected: Script Initiated Connection to Non-Local Network
Sigma detected: Suspicious Microsoft Office Child Process
Sigma detected: WScript or CScript Dropper
System process connects to network (likely due to code injection or exploit)
Windows Scripting host queries suspicious COM object (likely to drop second stage)
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1413036 Sample: RFQ-000753.xla.xlsx Startdate: 21/03/2024 Architecture: WINDOWS Score: 100 35 qly.ai 2->35 47 Multi AV Scanner detection for domain / URL 2->47 49 Malicious sample detected (through community Yara rule) 2->49 51 Antivirus detection for dropped file 2->51 53 12 other signatures 2->53 8 EXCEL.EXE 51 44 2->8         started        signatures3 process4 dnsIp5 37 qly.ai 144.126.217.83, 49161, 49163, 49164 LOYOLAUS United States 8->37 39 103.67.162.213, 49162, 49165, 49167 AARNET-AS-APAustralianAcademicandResearchNetworkAARNe unknown 8->39 25 ilovehimtrulyfromm...andfacetoget[1].doc, Rich 8->25 dropped 12 WINWORD.EXE 345 41 8->12         started        17 wscript.exe 9 8->17         started        file6 process7 dnsIp8 41 qly.ai 12->41 27 C:\Users\user\AppData\Roaming\...\qly.ai.url, MS 12->27 dropped 29 C:\Users\user\AppData\Roaming\...\V5LvD.url, MS 12->29 dropped 31 ~WRF{9A86D375-7BED...C-F277BDE444A6}.tmp, Composite 12->31 dropped 33 C:\Users\user\AppData\Local\...\C7099D59.doc, Rich 12->33 dropped 59 Microsoft Office launches external ms-search protocol handler (WebDAV) 12->59 61 Office viewer loads remote template 12->61 63 Microsoft Office drops suspicious files 12->63 19 EQNEDT32.EXE 12 12->19         started        43 paste.ee 17->43 45 paste.ee 104.21.84.67, 443, 49169 CLOUDFLARENETUS United States 17->45 65 System process connects to network (likely due to code injection or exploit) 17->65 67 Installs new ROOT certificates 17->67 69 Windows Scripting host queries suspicious COM object (likely to drop second stage) 17->69 file9 71 Connects to a pastebin service (likely for C&C) 43->71 signatures10 process11 file12 23 C:\Users\user\...\imaginepixelmediakiss.vbs, Unicode 19->23 dropped 55 Office equation editor establishes network connection 19->55 57 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 19->57 signatures13
Detection:
cve-2017-11882-shellcode
Create hunting rule
Link:
https://mwdb.cert.pl/sample/d483c4f1670ea7a69f9cdbbf716e67f1511e271d485229566afaa67011304dd6/
Threat name:
Document-Excel.Trojan.Remcos
Create hunting rule
Status:
Malicious
First seen:
2024-03-20 07:54:06 UTC
File Type:
Document
Extracted files:
49
AV detection:
11 of 24 (45.83%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=2sb4j4lhb2t2nh443o7xc3th6fir4jy5jbjcsvtk7kthaejqjxla._file
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:remcos botnet:remotehost collection persistence rat spyware stealer
Link:
https://tria.ge/reports/240321-j968qsgf9t/
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 behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Uses Volume Shadow Copy WMI provider
Uses Volume Shadow Copy service COM API
Office loads VBA resources, possible macro or embedded object present
Enumerates physical storage devices
Drops file in System32 directory
Suspicious use of SetThreadContext
Accesses Microsoft Outlook accounts
Adds Run key to start application
Abuses OpenXML format to download file from external location
Reads user/profile data of web browsers
Blocklisted process makes network request
NirSoft MailPassView
NirSoft WebBrowserPassView
Nirsoft
Remcos
Malware Config
C2 Extraction:
107.172.31.178:2404
Malware family:
Remcos
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/d483c4f1670e/report/overview.html
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/d483c4f1670ea7a69f9cdbbf716e67f1511e271d485229566afaa67011304dd6

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:informational_win_ole_protected
Create hunting rule
Author:Jeff White (karttoon@gmail.com) @noottrak
Description:Identify OLE Project protection within documents.
Rule name:maldoc_OLE_file_magic_number
Create hunting rule
Author:Didier Stevens (https://DidierStevens.com)
Rule name:office_document_vba
Create hunting rule
Author:Jean-Philippe Teissier / @Jipe_
Description:Office document with embedded VBA
Reference:https://github.com/jipegit/

File information

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

Malspam

RemcosRAT

Excel file xlsx d483c4f1670ea7a69f9cdbbf716e67f1511e271d485229566afaa67011304dd6

(this sample)

  
Delivery method
Distributed via e-mail attachment

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