MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 49d137f7f8521f2fcde3f3e94a14fbe32210baf3f15522383c5e59016c641f7b. 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 1
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 49d137f7f8521f2fcde3f3e94a14fbe32210baf3f15522383c5e59016c641f7b
SHA3-384 hash: 145eb5dd47d8855bd381fa2702f8d6b91bb18e4ff5e1abfe2b74713279d6fb9d0260377eb95b713c9b9cc2059131f94c
SHA1 hash: df4a766397291743f15c4996e93c6b2e0f7d077e
MD5 hash: 498755df4e7db2b5ccc26cf792c66b98
humanhash: seven-king-sierra-green
File name:498755df4e7db2b5ccc26cf792c66b98
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:77'933 bytes
First seen:2024-07-31 09:46:48 UTC
Last seen:2024-07-31 11:34:52 UTC
File type:Rich Text Format (RTF) rtf
MIME type:text/rtf
ssdeep 384:N20wU7l2YXtFqMKAtlmDde31FYooZQDjDoDcy4d6E1HvmiEe+/Y:s87lH/9fP1oZQDnu4oe+Q
TLSH T1AB73CE58D78F46A4CF55A67B422B0E8842FCB73EF20105B571AC9335379DC2E496A87C
Reporter zbetcheckin
Tags:CVE-2017-11882 RemcosRAT rtf

Intelligence

File Origin
# of uploads :
2
# of downloads :
112
Origin country :
FR FR
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
498755df4e7db2b5ccc26cf792c66b98
Verdict:
No threats detected
Analysis date:
2024-07-31 09:48:55 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/19c41ba3-b825-4868-9d81-0596b7557fec

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
Score:
99.1%
Link:
https://cyber-fortress.com/docs/result/index.php?id=66aa0819037b02d0daecb8f0
Tags:
Encryption Execution Exploit Generic Network Office Other Stealth
Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Searching for synchronization primitives
Launching a process
Using the Windows Management Instrumentation requests
Creating a window
Sending an HTTP GET request
Creating a file in the %AppData% directory
Сreating synchronization primitives
Creating a process with a hidden window
Possible injection to a system process
Connection attempt by exploiting the app vulnerability
Creating a process from a recently created file
Launching a file downloaded from the Internet
Result
Verdict:
Malicious
File Type:
RTF File
Link:
https://app.docguard.net/49d137f7f8521f2fcde3f3e94a14fbe32210baf3f15522383c5e59016c641f7b/results/dashboard
Behaviour
BlacklistAPI detected
Verdict:
Likely Malicious
Threat level:
  7.5/10
Confidence:
100%
Link:
https://www.filescan.io/uploads/66aa0821dfa8b2fced50593c/reports/180cca13-178a-4106-aa89-f9f86863b0d9/overview
Verdict:
Malicious
Labled as:
CVE-2017-11882
Link:
https://www.hybrid-analysis.com/sample/49d137f7f8521f2fcde3f3e94a14fbe32210baf3f15522383c5e59016c641f7b
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/1485263
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 a global keyboard hook
Malicious sample detected (through community Yara rule)
Maps a DLL or memory area into another process
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)
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: Net WebClient Casing Anomalies
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
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: 1485263 Sample: dRF6x7lGEB.rtf Startdate: 31/07/2024 Architecture: WINDOWS Score: 100 69 Multi AV Scanner detection for domain / URL 2->69 71 Found malware configuration 2->71 73 Malicious sample detected (through community Yara rule) 2->73 75 25 other signatures 2->75 11 WINWORD.EXE 336 17 2->11         started        process3 file4 41 C:\Users\...\~WRD0000.tmp:Zone.Identifier, ASCII 11->41 dropped 43 C:\Users\user\Desktop\~WRD0000.tmp, Rich 11->43 dropped 45 C:\Users\user\Desktop\dRF6x7lGEB.rtf (copy), Rich 11->45 dropped 47 ~WRF{BA774513-925F...5-43A0100D74CE}.tmp, Composite 11->47 dropped 14 EQNEDT32.EXE 12 11->14         started        process5 dnsIp6 63 192.3.176.154, 49163, 49165, 80 AS-COLOCROSSINGUS United States 14->63 51 C:\Users\...\buttersmoothflowerwayssmooth.vBS, Unicode 14->51 dropped 65 Office equation editor establishes network connection 14->65 67 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 14->67 19 wscript.exe 1 14->19         started        file7 signatures8 process9 signatures10 85 Suspicious powershell command line found 19->85 87 Wscript starts Powershell (via cmd or directly) 19->87 89 Very long command line found 19->89 91 3 other signatures 19->91 22 powershell.exe 4 19->22         started        process11 signatures12 93 Suspicious powershell command line found 22->93 95 Suspicious execution chain found 22->95 25 powershell.exe 12 5 22->25         started        process13 dnsIp14 53 servidorwindows.duckdns.org 25->53 55 servidorwindows.duckdns.org 191.55.90.161, 49164, 80 ALGARTELECOMSABR Brazil 25->55 97 Writes to foreign memory regions 25->97 99 Injects a PE file into a foreign processes 25->99 29 RegAsm.exe 3 13 25->29         started        signatures15 101 Uses dynamic DNS services 53->101 process16 dnsIp17 57 serversw.duckdns.org 29->57 59 serversw.duckdns.org 135.148.195.248, 49166, 49167, 6875 AVAYAUS United States 29->59 61 geoplugin.net 178.237.33.50, 49168, 80 ATOM86-ASATOM86NL Netherlands 29->61 49 C:\Users\user\AppData\Local\Temp\...\logs.dat, data 29->49 dropped 103 Contains functionality to bypass UAC (CMSTPLUA) 29->103 105 Detected Remcos RAT 29->105 107 Tries to steal Mail credentials (via file registry) 29->107 111 7 other signatures 29->111 34 RegAsm.exe 1 29->34         started        37 RegAsm.exe 1 29->37         started        39 RegAsm.exe 11 29->39         started        file18 109 Uses dynamic DNS services 57->109 signatures19 process20 signatures21 77 Tries to steal Instant Messenger accounts or passwords 34->77 79 Tries to steal Mail credentials (via file / registry access) 34->79 81 Searches for Windows Mail specific files 34->81 83 Tries to harvest and steal browser information (history, passwords, etc) 37->83
Score:
100%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/49d137f7f8521f2fcde3f3e94a14fbe32210baf3f15522383c5e59016c641f7b
Detection:
remcos
Create hunting rule
Link:
https://mwdb.cert.pl/sample/49d137f7f8521f2fcde3f3e94a14fbe32210baf3f15522383c5e59016c641f7b/
Threat name:
Document-RTF.Exploit.CVE-2017-11882
Create hunting rule
Status:
Malicious
First seen:
2024-07-31 09:47:04 UTC
File Type:
Document
Extracted files:
5
AV detection:
17 of 24 (70.83%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=jhitp57ykips7tpd6puuufh34mrbboxt6fkseob4lzmqc3ded55q._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
discovery execution
Link:
https://tria.ge/reports/240731-lr665axekr/
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
Verdict:
Suspicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/d850355a-55c0-44c4-bb89-dd20c7bc5343
Malware family:
Remcos
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/49d137f7f852/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/49d137f7f8521f2fcde3f3e94a14fbe32210baf3f15522383c5e59016c641f7b

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 49d137f7f8521f2fcde3f3e94a14fbe32210baf3f15522383c5e59016c641f7b

(this sample)

  
Delivery method
Distributed via web download
  
URLhaus
https://urlhaus.abuse.ch/url/3080648/

Comments


Avatar
zbet commented on 2024-07-31 09:46:49 UTC

url : hxxp://192.3.176.154/900/smo/xxx.doc