MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 cb52c9e9b94df7b76f7c60dbcc8bf83494852f88fe31b6a351b895340eec5f41. 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: 12


Intelligence 12 IOCs YARA 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: cb52c9e9b94df7b76f7c60dbcc8bf83494852f88fe31b6a351b895340eec5f41
SHA3-384 hash: 7e3366f25ed66e0849662a2abcadbdc6b080fc6aa0071a57068e648e9a6d1ffaefaf372bc9f05c381826e13bde23acc3
SHA1 hash: 69faf17c46cebe65552d692de9ad5e8e558afa10
MD5 hash: 6404605c3765beb0030c114bc3a377b4
humanhash: august-cat-juliet-purple
File name:PO.doc
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:167'648 bytes
First seen:2024-04-10 08:53:40 UTC
Last seen:2024-04-12 12:12:29 UTC
File type:Word file doc
MIME type:text/rtf
ssdeep 768:BGwAbZSibMX9gRWjtwAbZSibMX9gRWjtwAbZSibMX9gRWj6ntl39f4FHVO8RknN1:BGwAlRkwAlRkwAlRDtl3Z4NknA7f3jXW
TLSH T199F39B6DD34B01598F624377AB571E5542BDBA6EF38412B0306C437933EAC3DA2252BE
Reporter pr0xylife
Tags:CVE-2017-11882 doc RemcosRAT

Intelligence

File Origin
# of uploads :
4
# of downloads :
381
Origin country :
DE DE
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
cb52c9e9b94df7b76f7c60dbcc8bf83494852f88fe31b6a351b895340eec5f41.doc
Verdict:
Suspicious activity
Analysis date:
2024-04-10 08:54:43 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/7264208e-c7e7-4ada-bd31-b321f8083e5a

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Result
Verdict:
Malicious
File Type:
Fake RTF File
Link:
https://app.docguard.net/cb52c9e9b94df7b76f7c60dbcc8bf83494852f88fe31b6a351b895340eec5f41/results/dashboard
Behaviour
BlacklistAPI detected
Verdict:
Malicious
Labled as:
CVE-2018-0798
Link:
https://www.hybrid-analysis.com/sample/cb52c9e9b94df7b76f7c60dbcc8bf83494852f88fe31b6a351b895340eec5f41
Label:
Malicious
Suspicious Score:
10/10
Score Malicious:
1%
Score Benign:
0%
Link:
https://www.malware.ai/gui/files/?id=74c15bf3-2a75-4a5a-8f1c-a9cf4a7b6b41
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/1423756
Signature
.NET source code contains potential unpacker
.NET source code contains very large array initializations
Adds a directory exclusion to Windows Defender
Antivirus detection for URL or domain
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)
Drops PE files with a suspicious file extension
Found malware configuration
Injects a PE file into a foreign processes
Installs a global keyboard hook
Installs new ROOT certificates
Machine Learning detection for dropped file
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 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)
Searches for Windows Mail specific files
Sigma detected: Equation Editor Network Connection
Sigma detected: Powershell Base64 Encoded MpPreference Cmdlet
Sigma detected: Remcos
Sigma detected: Suspicious Microsoft Office Child Process
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
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: 1423756 Sample: PO.doc Startdate: 10/04/2024 Architecture: WINDOWS Score: 100 47 Multi AV Scanner detection for domain / URL 2->47 49 Found malware configuration 2->49 51 Malicious sample detected (through community Yara rule) 2->51 53 20 other signatures 2->53 8 WINWORD.EXE 336 13 2->8         started        process3 process4 10 EQNEDT32.EXE 11 8->10         started        15 pdtndo33920.scr 3 13 8->15         started        17 EQNEDT32.EXE 8->17         started        dnsIp5 39 covid19help.top 104.21.83.128, 443, 49161 CLOUDFLARENETUS United States 10->39 33 C:\Users\user\AppData\...\pdtndo33920.scr, PE32 10->33 dropped 35 C:\Users\user\AppData\Local\...\pdtzx[1].scr, PE32 10->35 dropped 71 Installs new ROOT certificates 10->71 73 Office equation editor establishes network connection 10->73 75 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 10->75 19 pdtndo33920.scr 1 8 10->19         started        41 psolver827.ddns.net 15->41 43 psolver827.ddns.net 91.92.244.185, 1974, 49162, 49163 THEZONEBG Bulgaria 15->43 45 geoplugin.net 178.237.33.50, 49164, 80 ATOM86-ASATOM86NL Netherlands 15->45 37 C:\ProgramData\28pdt\logs.dat, data 15->37 dropped 77 Detected Remcos RAT 15->77 79 Maps a DLL or memory area into another process 15->79 81 Installs a global keyboard hook 15->81 22 pdtndo33920.scr 1 15->22         started        24 pdtndo33920.scr 1 15->24         started        26 pdtndo33920.scr 11 15->26         started        28 pdtndo33920.scr 15->28         started        file6 83 Uses dynamic DNS services 41->83 signatures7 process8 signatures9 55 Multi AV Scanner detection for dropped file 19->55 57 Contains functionality to bypass UAC (CMSTPLUA) 19->57 59 Tries to steal Mail credentials (via file registry) 19->59 69 8 other signatures 19->69 30 powershell.exe 4 19->30         started        61 Tries to steal Instant Messenger accounts or passwords 22->61 63 Tries to steal Mail credentials (via file / registry access) 22->63 65 Searches for Windows Mail specific files 22->65 67 Tries to harvest and steal browser information (history, passwords, etc) 24->67 process10 signatures11 85 Installs new ROOT certificates 30->85
Score:
99%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/cb52c9e9b94df7b76f7c60dbcc8bf83494852f88fe31b6a351b895340eec5f41
Detection:
cve-2017-11882-shellcode
Create hunting rule
Link:
https://mwdb.cert.pl/sample/cb52c9e9b94df7b76f7c60dbcc8bf83494852f88fe31b6a351b895340eec5f41/
Threat name:
Document-RTF.Exploit.CVE-2017-11882
Create hunting rule
Status:
Malicious
First seen:
2024-04-10 00:33:16 UTC
File Type:
Document
Extracted files:
3
AV detection:
17 of 37 (45.95%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=znjmt2nzjx33o334mdn4zc7ygskikl4i7yy3ni2rxcktidxml5aq._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
n/a
Link:
https://tria.ge/reports/240410-ktv17shh78/
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
Enumerates physical storage devices
Drops file in Windows directory
Drops file in System32 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:
Malicious File
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/cb52c9e9b94df7b76f7c60dbcc8bf83494852f88fe31b6a351b895340eec5f41

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

File information

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

RemcosRAT

Word file doc cb52c9e9b94df7b76f7c60dbcc8bf83494852f88fe31b6a351b895340eec5f41

(this sample)

RemcosRAT

Executable exe 9942af44037bcfef5830dd71011bbd6ecc4c79c8bc1e62018eadc3ea4012e38a

  
Dropping
SHA256 9942af44037bcfef5830dd71011bbd6ecc4c79c8bc1e62018eadc3ea4012e38a
  
Dropping
MD5 58d7c309074a22de4d483eed6644e178

Comments