MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 37f95d8178a57e896632facd8387f1318dc37388159052e0e428b94bb5b0089c. 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: 15


Intelligence 15 IOCs YARA 1 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 37f95d8178a57e896632facd8387f1318dc37388159052e0e428b94bb5b0089c
SHA3-384 hash: f3b20045728ff34311b647ee7c61372530a06c08bcfae0e2db8b27614f06f034d0bf3d0a38a684b1b88fe7e209dc9158
SHA1 hash: f4c79776bc1118e884270b11d3f0680d752fe4f1
MD5 hash: 97184c45a919e70afa3378753cae6e2f
humanhash: east-oregon-mango-pip
File name:another.rtf
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:99'588 bytes
First seen:2024-08-27 16:48:37 UTC
Last seen:2024-08-27 18:21:03 UTC
File type:Rich Text Format (RTF) rtf
MIME type:text/rtf
ssdeep 768:NFk+9I/MXaT39BZR2sd7PaUDm0RePq0+PH9+mkTi:NFkSIVtBZlpGXcHSi
TLSH T18EA3E069E78F01A1DF50A377032B4A8846FCB73EB20111B175AC87703BEDD2D8566978
Magika rtf
Reporter adm1n_usa32
Tags:CVE-2017-11882 RemcosRAT rtf

Intelligence

File Origin
# of uploads :
2
# of downloads :
108
Origin country :
RO RO
Vendor Threat Intelligence
Malware family:
remcos
Create hunting rule
ID:
1
File name:
another.rtf
Verdict:
Malicious activity
Analysis date:
2024-08-27 16:47:54 UTC
Tags:
exploit cve-2017-11882 stegocampaign loader rat remcos remote evasion stealer mpress
Link:
https://app.any.run/tasks/c2c0f82d-c113-4c94-9fb9-9c372d5bd487

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection(s):
SecuriteInfo.com.Exploit.Rtf.Obfuscated.32.31117.5546.UNOFFICIAL
Create hunting rule

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

TwinWave.EvilRTF.ObfusRunAway.20240409.UNOFFICIAL
Create hunting rule

Verdict:
Malicious
Score:
99.1%
Link:
https://cyber-fortress.com/docs/result/index.php?id=66ce03807a17e3c6872290a8
Tags:
Encryption Execution Exploit Generic Network Office Stealth Obfuscated
Result
Verdict:
Malware
Maliciousness:

Behaviour
Sending an HTTP GET request to an infection source by exploiting the app vulnerability
Creating a file in the %AppData% directory
Сreating synchronization primitives
Creating a process with a hidden window
Launching a service
DNS request
Connection attempt
Sending a custom TCP request
Sending an HTTP GET request to an infection source
Possible injection to a system process
Searching for the window
Searching for synchronization primitives
Launching a process
Using the Windows Management Instrumentation requests
Creating a window
Connection attempt to an infection source
Connection attempt to an infection source by exploiting the app vulnerability
Creating a process from a recently created file
Launching a file downloaded from the Internet
Unauthorized injection to a system process
Result
Verdict:
Malicious
File Type:
RTF File
Link:
https://app.docguard.net/37f95d8178a57e896632facd8387f1318dc37388159052e0e428b94bb5b0089c/results/dashboard
Behaviour
BlacklistAPI detected
Verdict:
Malicious
Labled as:
CVE-2017-11882
Link:
https://www.hybrid-analysis.com/sample/37f95d8178a57e896632facd8387f1318dc37388159052e0e428b94bb5b0089c
Result
Verdict:
MALICIOUS
Result
Threat name:
Remcos
Create hunting rule
Detection:
malicious
Classification:
phis.troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1499986
Signature
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Antivirus detection for URL or domain
Bypasses PowerShell execution policy
C2 URLs / IPs found in malware configuration
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
Delayed program exit found
Detected Remcos RAT
Document exploit detected (process start blacklist hit)
Found malware configuration
Found potential equation exploit (CVE-2017-11882)
Injects a PE file into a foreign processes
Installs new ROOT certificates
Malicious sample detected (through community Yara rule)
Maps a DLL or memory area into another process
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)
Searches for Windows Mail specific files
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: Remcos
Sigma detected: Suspicious Microsoft Office Child Process
Sigma detected: WScript or CScript Dropper
Suricata IDS alerts for network traffic
Suspicious execution chain found
Suspicious powershell command line found
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 Powershell download and execute
Yara detected Remcos RAT
Yara detected UAC Bypass using CMSTP
Yara detected WebBrowserPassView password recovery tool
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 1499986 Sample: another.rtf Startdate: 27/08/2024 Architecture: WINDOWS Score: 100 74 Suricata IDS alerts for network traffic 2->74 76 Found malware configuration 2->76 78 Malicious sample detected (through community Yara rule) 2->78 80 24 other signatures 2->80 11 WINWORD.EXE 336 18 2->11         started        process3 file4 42 C:\Users\...\~WRD0000.tmp:Zone.Identifier, ASCII 11->42 dropped 44 C:\Users\user\Desktop\~WRD0000.tmp, Rich 11->44 dropped 46 C:\Users\user\Desktop\another.rtf (copy), Rich 11->46 dropped 48 ~WRF{425A805F-DB00...1-630A1F986295}.tmp, Composite 11->48 dropped 14 EQNEDT32.EXE 12 11->14         started        process5 dnsIp6 60 198.46.178.137, 49163, 49165, 80 AS-COLOCROSSINGUS United States 14->60 50 C:\Users\...\shegoodforeverythingtogetmef.vBS, Unicode 14->50 dropped 62 Office equation editor establishes network connection 14->62 64 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 14->64 19 wscript.exe 1 14->19         started        file7 signatures8 process9 signatures10 82 Suspicious powershell command line found 19->82 84 Wscript starts Powershell (via cmd or directly) 19->84 86 Very long command line found 19->86 88 3 other signatures 19->88 22 powershell.exe 4 19->22         started        process11 signatures12 90 Suspicious powershell command line found 22->90 92 Suspicious execution chain found 22->92 25 powershell.exe 12 5 22->25         started        process13 dnsIp14 52 ia803104.us.archive.org 207.241.232.154, 443, 49164 INTERNET-ARCHIVEUS United States 25->52 94 Installs new ROOT certificates 25->94 96 Writes to foreign memory regions 25->96 98 Injects a PE file into a foreign processes 25->98 29 RegAsm.exe 3 10 25->29         started        signatures15 process16 dnsIp17 54 dogmand.duckdns.org 29->54 56 dogmand.duckdns.org 103.186.116.99, 14645, 49166, 49167 AARNET-AS-APAustralianAcademicandResearchNetworkAARNe unknown 29->56 58 geoplugin.net 178.237.33.50, 49168, 80 ATOM86-ASATOM86NL Netherlands 29->58 100 Contains functionality to bypass UAC (CMSTPLUA) 29->100 102 Detected Remcos RAT 29->102 104 Tries to steal Mail credentials (via file registry) 29->104 108 6 other signatures 29->108 33 RegAsm.exe 1 29->33         started        36 RegAsm.exe 1 29->36         started        38 RegAsm.exe 11 29->38         started        40 RegAsm.exe 29->40         started        signatures18 106 Uses dynamic DNS services 54->106 process19 signatures20 66 Tries to steal Instant Messenger accounts or passwords 33->66 68 Tries to steal Mail credentials (via file / registry access) 33->68 70 Searches for Windows Mail specific files 33->70 72 Tries to harvest and steal browser information (history, passwords, etc) 36->72
Score:
100%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/37f95d8178a57e896632facd8387f1318dc37388159052e0e428b94bb5b0089c
Detection:
cve-2017-11882-shellcode
Create hunting rule
Link:
https://mwdb.cert.pl/sample/37f95d8178a57e896632facd8387f1318dc37388159052e0e428b94bb5b0089c/
Threat name:
Document-RTF.Exploit.CVE-2017-11882
Create hunting rule
Status:
Malicious
First seen:
2024-08-27 08:16:05 UTC
File Type:
Document
Extracted files:
4
AV detection:
18 of 38 (47.37%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=g74v3alyuv7iszrs7lgyhb7rggg4g44icwiffyhefc4uxnnqbcoa._file
Result
Malware family:
n/a
Score:
  10/10
Tags:
discovery execution
Link:
https://tria.ge/reports/240827-vbnvaa1bnh/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Launches Equation Editor
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
Enumerates physical storage devices
System Location Discovery: System Language Discovery
Drops file in Windows directory
Drops file in System32 directory
Blocklisted process makes network request
Command and Scripting Interpreter: PowerShell
Malware Config
Dropper Extraction:
https://ia803104.us.archive.org/27/items/vbs_20240726_20240726/vbs.jpg
Malware family:
Remcos
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/37f95d8178a5/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/37f95d8178a57e896632facd8387f1318dc37388159052e0e428b94bb5b0089c

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: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

File information

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

Web download

RemcosRAT

Rich Text Format (RTF) rtf 37f95d8178a57e896632facd8387f1318dc37388159052e0e428b94bb5b0089c

(this sample)

anyrun
any.run
https://app.any.run/tasks/c2c0f82d-c113-4c94-9fb9-9c372d5bd487
  
URLhaus
https://urlhaus.abuse.ch/url/3131003/
  
Delivery method
Distributed via web download

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