MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 08f8f68b340189648071307dc98770ddf065c25cffb8be77ede5ef463519fdc8. 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: 14


Maldoc score: 4


Intelligence 14 IOCs YARA 3 File information Comments

SHA256 hash: 08f8f68b340189648071307dc98770ddf065c25cffb8be77ede5ef463519fdc8
SHA3-384 hash: dc54e58d912acbe9d480deca0251ffa65fbb7944d3a99c66cdd01b5b6163ad5c9ab201495b5be9a3ffc7b1e875450755
SHA1 hash: 1dd4807ba8b7f99c730d56990b9b1bb188d12e25
MD5 hash: a3c487cd79a32dc056ac50e644d47b67
humanhash: golf-hotel-maryland-red
File name:Ref_FTD431100.xls
Download: download sample
Signature RemcosRAT
File size:249'856 bytes
First seen:2024-05-24 05:27:17 UTC
Last seen:2024-05-24 06:36:00 UTC
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 6144:qe4UcLe0JOqPQZR8MDdATCR3tSjAmmCUKI4LX2iiITp:IUP/qPQZR8MxAm/ScmW41iITp
TLSH T1CF3402267E74D057C12984B86CDD85D3BF36BCD2AF42B04F3268335EAA32169DC2159E
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 abuse_ch
Tags:RemcosRAT xls

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: 4
OLE dump

MalwareBazaar was able to identify 15 sections in this file using oledump:

Section IDSection sizeSection name
1114 bytesCompObj
2244 bytesDocumentSummaryInformation
3200 bytesSummaryInformation
499 bytesMBD00035E8F/CompObj
5149523 bytesMBD00035E8F/Package
6352 bytesMBD00035E90/Ole
784334 bytesWorkbook
8523 bytes_VBA_PROJECT_CUR/PROJECT
9104 bytes_VBA_PROJECT_CUR/PROJECTwm
10977 bytes_VBA_PROJECT_CUR/VBA/Sheet1
11977 bytes_VBA_PROJECT_CUR/VBA/Sheet2
12977 bytes_VBA_PROJECT_CUR/VBA/Sheet3
13985 bytes_VBA_PROJECT_CUR/VBA/ThisWorkbook
142644 bytes_VBA_PROJECT_CUR/VBA/_VBA_PROJECT
15553 bytes_VBA_PROJECT_CUR/VBA/dir
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
SuspiciousHex StringsHex-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)

Intelligence


File Origin
# of uploads :
2
# of downloads :
328
Origin country :
NL NL
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
08f8f68b340189648071307dc98770ddf065c25cffb8be77ede5ef463519fdc8.xls
Verdict:
Suspicious activity
Analysis date:
2024-05-24 05:37:55 UTC
Tags:
n/a

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Legit
File type:
application/vnd.ms-excel
Has a screenshot:
False
Contains macros:
False
Verdict:
Malicious
Score:
81.4%
Tags:
Network Office Stealth Heur
Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
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
Payload URLs
URL
File name
http://z2.ink/wNkJ
Embedded Ole
Behaviour
BlacklistAPI detected
Document image
Document image
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
language-tr macros
Gathering data
Result
Threat name:
Detection:
malicious
Classification:
spre.phis.troj.spyw.expl.evad
Score:
100 / 100
Signature
Antivirus detection for dropped file
Antivirus detection for URL or domain
Bypasses PowerShell execution policy
C2 URLs / IPs found in malware configuration
Connects to a pastebin service (likely for C&C)
Contains functionality to bypass UAC (CMSTPLUA)
Contains functionality to inject code into remote processes
Contains functionality to register a low level keyboard hook
Contains functionality to steal Chrome passwords or cookies
Contains functionality to steal Firefox passwords or cookies
Creates autostart registry keys with suspicious values (likely registry only malware)
Delayed program exit found
Detected Remcos RAT
Document exploit detected (process start blacklist hit)
Excel sheet contains many unusual embedded objects
Found malware configuration
Injects a PE file into a foreign processes
Installs a global keyboard hook
Installs new ROOT certificates
Malicious sample detected (through community Yara rule)
Maps a DLL or memory area into another process
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 document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Office equation editor establishes network connection
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Office viewer loads remote template
Searches for Windows Mail specific files
Shellcode detected
Sigma detected: Base64 Encoded PowerShell Command Detected
Sigma detected: EQNEDT32.EXE connecting to internet
Sigma detected: Equation Editor Network Connection
Sigma detected: File Dropped By EQNEDT32EXE
Sigma detected: Potential PowerShell Obfuscation Via Reversed Commands
Sigma detected: PowerShell Base64 Encoded FromBase64String Cmdlet
Sigma detected: Powershell download and load assembly
Sigma detected: Powershell download payload from hardcoded c2 list
Sigma detected: Remcos
Sigma detected: Script Initiated Connection to Non-Local Network
Sigma detected: Suspicious Microsoft Office Child Process
Sigma detected: WScript or CScript Dropper
Snort IDS alert for network traffic
Suspicious execution chain found
Suspicious powershell command line found
System process connects to network (likely due to code injection or exploit)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Instant Messenger accounts or passwords
Tries to steal Mail credentials (via file / registry access)
Tries to steal Mail credentials (via file registry)
Uses dynamic DNS services
Very long command line found
Windows Scripting host queries suspicious COM object (likely to drop second stage)
Writes to foreign memory regions
Wscript starts Powershell (via cmd or directly)
Yara detected Generic Downloader
Yara detected Powershell download and execute
Yara detected Remcos RAT
Yara detected UAC Bypass using CMSTP
Yara detected WebBrowserPassView password recovery tool
Behaviour
Behavior Graph:
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1446981 Sample: Ref_FTD431100.xls Startdate: 24/05/2024 Architecture: WINDOWS Score: 100 69 z2.ink 2->69 97 Snort IDS alert for network traffic 2->97 99 Multi AV Scanner detection for domain / URL 2->99 101 Found malware configuration 2->101 103 28 other signatures 2->103 11 EXCEL.EXE 36 37 2->11         started        15 wscript.exe 2->15         started        18 wscript.exe 2->18         started        signatures3 process4 dnsIp5 85 198.12.107.122, 49164, 49169, 49172 AS-COLOCROSSINGUS United States 11->85 87 z2.ink 54.241.153.192, 49163, 49165, 49166 AMAZON-02US United States 11->87 67 lionsarethekingofj...ekingofevery[1].doc, ISO-8859 11->67 dropped 20 wscript.exe 11 11->20         started        24 WINWORD.EXE 337 35 11->24         started        27 DW20.EXE 11->27         started        147 Windows Scripting host queries suspicious COM object (likely to drop second stage) 15->147 file6 signatures7 process8 dnsIp9 71 paste.ee 20->71 73 uploaddeimagens.com.br 188.114.97.3, 443, 49174, 49175 CLOUDFLARENETUS European Union 20->73 105 System process connects to network (likely due to code injection or exploit) 20->105 107 Suspicious powershell command line found 20->107 109 Wscript starts Powershell (via cmd or directly) 20->109 119 5 other signatures 20->119 29 powershell.exe 4 20->29         started        75 z2.ink 24->75 57 C:\Users\user\AppData\Roaming\...\z2.ink.url, MS 24->57 dropped 59 C:\Users\user\AppData\Roaming\...\wNkJ.url, MS 24->59 dropped 61 ~WRF{CDC4AD61-7E3F...9-271F820FB723}.tmp, Composite 24->61 dropped 63 C:\Users\user\AppData\Local\...\F3866DCE.doc, ISO-8859 24->63 dropped 111 Microsoft Office launches external ms-search protocol handler (WebDAV) 24->111 113 Office viewer loads remote template 24->113 115 Microsoft Office drops suspicious files 24->115 32 EQNEDT32.EXE 12 24->32         started        35 DWWIN.EXE 4 27->35         started        file10 117 Connects to a pastebin service (likely for C&C) 71->117 signatures11 process12 file13 139 Suspicious powershell command line found 29->139 141 Suspicious execution chain found 29->141 37 powershell.exe 13 6 29->37         started        55 C:\Users\...\arebeautifulgirlwomenimage.vbs, Unicode 32->55 dropped 143 Office equation editor establishes network connection 32->143 145 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 32->145 signatures14 process15 dnsIp16 77 uploaddeimagens.com.br 37->77 121 Suspicious powershell command line found 37->121 123 Creates autostart registry keys with suspicious values (likely registry only malware) 37->123 125 Writes to foreign memory regions 37->125 127 Injects a PE file into a foreign processes 37->127 41 RegAsm.exe 37->41         started        46 powershell.exe 5 37->46         started        signatures17 process18 dnsIp19 79 trutru.duckdns.org 41->79 81 trutru.duckdns.org 103.186.117.184, 1199, 49178, 49179 AARNET-AS-APAustralianAcademicandResearchNetworkAARNe unknown 41->81 83 geoplugin.net 178.237.33.50, 49181, 80 ATOM86-ASATOM86NL Netherlands 41->83 65 C:\ProgramData\fsfgdgdfgfd\logs.dat, data 41->65 dropped 129 Contains functionality to bypass UAC (CMSTPLUA) 41->129 131 Detected Remcos RAT 41->131 133 Tries to steal Mail credentials (via file registry) 41->133 137 8 other signatures 41->137 48 RegAsm.exe 41->48         started        51 RegAsm.exe 41->51         started        53 RegAsm.exe 41->53         started        file20 135 Uses dynamic DNS services 79->135 signatures21 process22 signatures23 89 Tries to steal Instant Messenger accounts or passwords 48->89 91 Tries to steal Mail credentials (via file / registry access) 48->91 93 Searches for Windows Mail specific files 48->93 95 Tries to harvest and steal browser information (history, passwords, etc) 51->95
Threat name:
Document-Excel.Trojan.Heuristic
Status:
Malicious
First seen:
2024-05-24 03:07:21 UTC
File Type:
Document
Extracted files:
41
AV detection:
11 of 24 (45.83%)
Threat level:
  2/5
Result
Malware family:
n/a
Score:
  8/10
Tags:
execution
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
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
Abuses OpenXML format to download file from external location
Blocklisted process makes network request
Command and Scripting Interpreter: PowerShell
Verdict:
Suspicious
Tags:
n/a
YARA:
n/a
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:informational_win_ole_protected
Author:Jeff White (karttoon@gmail.com) @noottrak
Description:Identify OLE Project protection within documents.
Rule name:maldoc_OLE_file_magic_number
Author:Didier Stevens (https://DidierStevens.com)
Rule name:office_document_vba
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.

Comments