MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 c3d93fd4a248da7dbf8400da8b0efbd6a2f2aa549cf829dae9902ca9d4fec240. 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 2 File information Comments 1
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: c3d93fd4a248da7dbf8400da8b0efbd6a2f2aa549cf829dae9902ca9d4fec240
SHA3-384 hash: 926ef40a10470e78cc179971f2421868758021cc13b718cd4de07fe0bb813b67fe20ab8fd60a77355d431a4d20841fc3
SHA1 hash: caa0421f8c96b4349873c6f8c2e2f5045f7d06ad
MD5 hash: b399ca1298c7cb77fe79901d11a28452
humanhash: romeo-floor-echo-glucose
File name:b399ca1298c7cb77fe79901d11a28452
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:25'610 bytes
First seen:2023-05-06 04:26:58 UTC
Last seen:Never
File type:Rich Text Format (RTF) rtf
MIME type:text/rtf
ssdeep 768:BKVZYOClYBAuqnsqUs4UBHHXglxvj9Fun+wFbaE4k5uEi:BKVZY7lYBA1sbsjnf9FmEM
TLSH T173B2E5565B8C4C61E36AE8BB435DA00E18BCF23631C245E5BDADE2717B3D14E0B671B8
Reporter zbetcheckin
Tags:CVE-2017-11882 RemcosRAT rtf

Intelligence

File Origin
# of uploads :
1
# of downloads :
130
Origin country :
FR FR
Vendor Threat Intelligence
Malware family:
remcos
Create hunting rule
ID:
1
File name:
b399ca1298c7cb77fe79901d11a28452
Verdict:
Malicious activity
Analysis date:
2023-05-06 04:28:30 UTC
Tags:
opendir exploit cve-2017-11882 loader rat remcos keylogger
Link:
https://app.any.run/tasks/a2b0a3b1-24c4-43fe-953e-09a085e4b21d

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection(s):
Sanesecurity.Malware.29030.RtfHeur.UNOFFICIAL
Create hunting rule

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

MiscreantPunch.RTF.2017-0199.Obfus.171711.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Creating a window
Сreating synchronization primitives
Result
Verdict:
Malicious
File Type:
RTF File
Link:
https://app.docguard.net/c3d93fd4a248da7dbf8400da8b0efbd6a2f2aa549cf829dae9902ca9d4fec240/results/dashboard
Behaviour
BlacklistAPI detected
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
embedequation exploit shellcode
Link:
https://www.filescan.io/uploads/6455d717e9d38c7b451f22d1/reports/84c5118d-7838-4999-806f-a17a3fb0a19c/overview
Verdict:
Malicious
Labled as:
CVE-2017-11882
Link:
https://www.hybrid-analysis.com/sample/c3d93fd4a248da7dbf8400da8b0efbd6a2f2aa549cf829dae9902ca9d4fec240
Result
Verdict:
MALICIOUS
Result
Threat name:
Remcos
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1227440
Signature
.NET source code contains potential unpacker
Allocates memory in foreign processes
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Connects to many ports of the same IP (likely port scanning)
Contains functionality to bypass UAC (CMSTPLUA)
Contains functionality to modify clipboard data
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 an undocumented autostart registry key
Delayed program exit found
Drops PE files to the user root directory
Encrypted powershell cmdline option found
Found malware configuration
Injects a PE file into a foreign processes
Installs a global keyboard hook
Machine Learning detection for dropped file
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
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)
Shellcode detected
Sigma detected: EQNEDT32.EXE connecting to internet
Sigma detected: File Dropped By EQNEDT32EXE
Sigma detected: Remcos
Uses dynamic DNS services
Writes to foreign memory regions
Yara detected Remcos RAT
Yara detected UAC Bypass using CMSTP
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 860404 Sample: onTJMUsgUX.rtf Startdate: 06/05/2023 Architecture: WINDOWS Score: 100 36 yousbresde.ddns.net 2->36 50 Found malware configuration 2->50 52 Malicious sample detected (through community Yara rule) 2->52 54 Antivirus detection for URL or domain 2->54 56 18 other signatures 2->56 8 EQNEDT32.EXE 12 2->8         started        13 WINWORD.EXE 336 18 2->13         started        15 EQNEDT32.EXE 2->15         started        signatures3 process4 dnsIp5 40 23.94.206.76, 49173, 80 AS-COLOCROSSINGUS United States 8->40 32 C:\Users\user\AppData\Local\...\vbc[1].exe, PE32 8->32 dropped 34 C:\Users\Public\vbc.exe, PE32 8->34 dropped 66 Office equation editor establishes network connection 8->66 68 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 8->68 17 vbc.exe 3 8->17         started        file6 signatures7 process8 file9 28 C:\Users\user\AppData\...\Hoqoxdwyyhs.exe, PE32 17->28 dropped 42 Antivirus detection for dropped file 17->42 44 Multi AV Scanner detection for dropped file 17->44 46 Creates an undocumented autostart registry key 17->46 48 5 other signatures 17->48 21 InstallUtil.exe 3 3 17->21         started        26 powershell.exe 6 17->26         started        signatures10 process11 dnsIp12 38 yousbresde.ddns.net 23.95.60.109, 31895, 49174, 49175 AS-COLOCROSSINGUS United States 21->38 30 C:\ProgramData\remcos\logs.dat, data 21->30 dropped 58 Contains functionality to bypass UAC (CMSTPLUA) 21->58 60 Contains functionality to steal Chrome passwords or cookies 21->60 62 Contains functionality to register a low level keyboard hook 21->62 64 4 other signatures 21->64 file13 signatures14
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/c3d93fd4a248da7dbf8400da8b0efbd6a2f2aa549cf829dae9902ca9d4fec240/
Threat name:
Document-RTF.Exploit.CVE-2017-11882
Create hunting rule
Status:
Malicious
First seen:
2023-05-02 12:53:58 UTC
File Type:
Document
Extracted files:
4
AV detection:
13 of 37 (35.14%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=ypmt7vfcjdnh3p4eadniwdx322rpfksutt4ctwxjsawktvh6yjaa._file
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:remcos botnet:clodyeye rat
Link:
https://tria.ge/reports/230506-e234wsac6z/
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
Suspicious use of SetThreadContext
Executes dropped EXE
Loads dropped DLL
Uses the VBS compiler for execution
Blocklisted process makes network request
Downloads MZ/PE file
Remcos
Malware Config
C2 Extraction:
yousbresde.ddns.net:31895
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/c3d93fd4a248da7dbf8400da8b0efbd6a2f2aa549cf829dae9902ca9d4fec240

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.

Web download

RemcosRAT

Rich Text Format (RTF) rtf c3d93fd4a248da7dbf8400da8b0efbd6a2f2aa549cf829dae9902ca9d4fec240

(this sample)

  
Delivery method
Distributed via web download
  
URLhaus
https://urlhaus.abuse.ch/url/2625921/

Comments


Avatar
zbet commented on 2023-05-06 04:27:07 UTC

url : hxxp://23.94.206.76/3/4/%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23%23.doc