MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 3491ffa7b3d64ed2cc7ab30130fd1e94e4442e5017cd63f5af3958a3e580b732. 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: 3491ffa7b3d64ed2cc7ab30130fd1e94e4442e5017cd63f5af3958a3e580b732
SHA3-384 hash: a4447da2e14b78d38cc607e59a0ec222f8449cc8a0508f5c6d48e752423afe0f8c4b8d1893140c9abc9124ee11c0acd7
SHA1 hash: e8d7bda6fb8709b3365ffde49c6e23c22f3814a8
MD5 hash: 44d1b4fbec745292186b3308a6b2d6a6
humanhash: alpha-fifteen-montana-mississippi
File name:shipping.doc
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:17'970 bytes
First seen:2022-08-15 15:39:25 UTC
Last seen:Never
File type:Word file doc
MIME type:application/octet-stream
ssdeep 384:CykZGFDmnXsl7XtiYrUkstjVPSGCKsurUyCd17aw:Y2/xiadstpPDFLUyCdkw
TLSH T17882243EF28B8F9CCB47D294040E3F861664F90C93D598D2E7BCFB38694595BC622964
Reporter pr0xylife
Tags:AgentTesla CVE-2017-11882 doc RemcosRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
267
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
shipping.doc
Verdict:
Malicious activity
Analysis date:
2022-08-15 15:49:27 UTC
Tags:
trojan opendir exploit CVE-2017-11882 loader
Link:
https://app.any.run/tasks/9b3a64c0-de99-4da0-aa76-078dfb5838cb

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
File type:
application/msword
Has a screenshot:
False
Contains macros:
False
Detection(s):
SecuriteInfo.com.Spam-473.UNOFFICIAL
Create hunting rule

Sanesecurity.Malware.27333.RtfHeur.BadVer.UNOFFICIAL
Create hunting rule

SecuriteInfo.com.FakeRTF-1.UNOFFICIAL
Create hunting rule

Sanesecurity.Malware.26244.RtfHeur.UNOFFICIAL
Create hunting rule

MiscreantPunch.RTF.EvilRTF.CVE-2017-0199-Obfus.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.RTFFakeVersionWithObjUpdateUKSurfMix.20200514.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Sending a custom TCP request
Searching for synchronization primitives
Launching a process
Creating a window
Creating a file
Сreating synchronization primitives
DNS request
Sending an HTTP GET request
Creating a process with a hidden window
Sending an HTTP GET request to an infection source by exploiting the app vulnerability
Creating a process from a recently created file
Result
Verdict:
Malicious
File Type:
Fake RTF File
Link:
https://app.docguard.net/3491ffa7b3d64ed2cc7ab30130fd1e94e4442e5017cd63f5af3958a3e580b732/results/dashboard
Verdict:
No Threat
Threat level:
  10/10
Confidence:
100%
Tags:
javascript
Link:
https://www.filescan.io/uploads/62fa691a080024921b7b3926/reports/5a543970-0179-4cc2-920d-5cfc5e2ef620/overview
Result
Verdict:
MALICIOUS
Result
Threat name:
AgentTesla, AsyncRAT, Remcos
Create hunting rule
Detection:
malicious
Classification:
phis.troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1051836
Signature
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Drops PE files to the user root directory
Encrypted powershell cmdline option found
Initial sample is an obfuscated RTF file
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 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
Shellcode detected
Sigma detected: EQNEDT32.EXE connecting to internet
Sigma detected: File Dropped By EQNEDT32EXE
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
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)
Writes to foreign memory regions
Yara detected AgentTesla
Yara detected AsyncRAT
Yara detected Costura Assembly Loader
Yara detected Generic Downloader
Yara detected Remcos RAT
Yara detected WebBrowserPassView password recovery tool
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 684350 Sample: shipping.doc Startdate: 15/08/2022 Architecture: WINDOWS Score: 100 60 mail.ptbci.co.id 2->60 62 ptbci.co.id 2->62 78 Initial sample is an obfuscated RTF file 2->78 80 Multi AV Scanner detection for domain / URL 2->80 82 Malicious sample detected (through community Yara rule) 2->82 84 18 other signatures 2->84 9 EQNEDT32.EXE 12 2->9         started        14 Xkpsfrhw.exe 12 3 2->14         started        16 WINWORD.EXE 291 21 2->16         started        18 Xkpsfrhw.exe 2->18         started        signatures3 process4 dnsIp5 66 45.86.64.211, 49182, 80 DEDIPATH-LLCUS France 9->66 52 C:\Users\user\AppData\Local\...\vbc[1].exe, PE32 9->52 dropped 54 C:\Users\Public\vbc.exe, PE32 9->54 dropped 100 Office equation editor establishes network connection 9->100 102 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 9->102 20 vbc.exe 13 5 9->20         started        68 garage891.com 14->68 104 Encrypted powershell cmdline option found 14->104 25 powershell.exe 14->25         started        27 InstallUtil.exe 14->27         started        56 ~WRF{EB23D100-6EAD...5-9CD0F89E565A}.tmp, Composite 16->56 dropped 70 garage891.com 18->70 file6 signatures7 process8 dnsIp9 64 garage891.com 103.157.146.2, 49183, 49187, 49188 TWIDC-AS-APTWIDCLimitedHK unknown 20->64 50 C:\Users\user\AppData\...\Xkpsfrhw.exe, PE32 20->50 dropped 86 Encrypted powershell cmdline option found 20->86 88 Writes to foreign memory regions 20->88 90 Injects a PE file into a foreign processes 20->90 29 InstallUtil.exe 2 15 20->29         started        34 powershell.exe 6 20->34         started        36 InstallUtil.exe 20->36         started        38 5 other processes 20->38 file10 signatures11 process12 dnsIp13 72 mail.mastercoa.co 213.152.161.40, 10174, 49184, 49185 GLOBALLAYERNL Netherlands 29->72 74 geoplugin.net 178.237.33.50, 49189, 80 ATOM86-ASATOM86NL Netherlands 29->74 58 C:\Users\user\AppData\Local\Temp\dwn.exe, PE32 29->58 dropped 106 Maps a DLL or memory area into another process 29->106 108 Installs a global keyboard hook 29->108 40 InstallUtil.exe 29->40         started        43 InstallUtil.exe 29->43         started        45 InstallUtil.exe 29->45         started        47 dwn.exe 29->47         started        file14 signatures15 process16 dnsIp17 92 Tries to steal Instant Messenger accounts or passwords 40->92 94 Tries to steal Mail credentials (via file / registry access) 40->94 96 Searches for Windows Mail specific files 40->96 98 Tries to harvest and steal browser information (history, passwords, etc) 43->98 76 garage891.com 47->76 signatures18
Detection:
cve-2017-11882-shellcode
Create hunting rule
Link:
https://mwdb.cert.pl/sample/3491ffa7b3d64ed2cc7ab30130fd1e94e4442e5017cd63f5af3958a3e580b732/
Threat name:
Document-Office.Exploit.CVE-2017-11882
Create hunting rule
Status:
Malicious
First seen:
2022-08-15 15:07:24 UTC
File Type:
Document
Extracted files:
5
AV detection:
16 of 26 (61.54%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=gsi77j5t2zhnftd2wmatb7i6stseilsqc7gwh5nphfmkhzmaw4za._file
Result
Malware family:
remcos
Create hunting rule
Score:
  10/10
Tags:
family:agenttesla family:remcos botnet:remotehost collection keylogger persistence rat spyware stealer trojan
Link:
https://tria.ge/reports/220815-s7m7hscfbn/
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 behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
outlook_office_path
outlook_win_path
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
Accesses Microsoft Outlook accounts
Accesses Microsoft Outlook profiles
Adds Run key to start application
Loads dropped DLL
Reads data files stored by FTP clients
Reads user/profile data of local email clients
Reads user/profile data of web browsers
Uses the VBS compiler for execution
Blocklisted process makes network request
Downloads MZ/PE file
Executes dropped EXE
NirSoft MailPassView
NirSoft WebBrowserPassView
Nirsoft
AgentTesla
Remcos
Malware Config
C2 Extraction:
mail.mastercoa.co:10174
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Legit
Score:
0.05
Link:
https://yomi.yoroi.company/submissions/3491ffa7b3d64ed2cc7ab30130fd1e94e4442e5017cd63f5af3958a3e580b732

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_RTF_Header_Anomaly_RID2F7F
Create hunting rule
Author:Florian Roth
Description:Detects malformed RTF header often used to trick mechanisms that check for a full RTF header
Reference:https://twitter.com/ItsReallyNick/status/975705759618158593

File information

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

Web download

RemcosRAT

Word file doc 3491ffa7b3d64ed2cc7ab30130fd1e94e4442e5017cd63f5af3958a3e580b732

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/2272969/
  
Delivery method
Distributed via web download

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