MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 99a37b119f17a69497cd85b20466e078ffe63573266437bd62cbec91205465e2. 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: 99a37b119f17a69497cd85b20466e078ffe63573266437bd62cbec91205465e2
SHA3-384 hash: 322eab369424799104df2084618bf5b5fd64fdce4f8ac0740574d2f58d61449d6d2b0febce7ce1c83a97137cf86444a2
SHA1 hash: 738c8db7918e79aba33bbc51949a51651a8da74c
MD5 hash: 84bafe55d9087cdfce20ebdd74b8610f
humanhash: vegan-nebraska-nebraska-coffee
File name:84bafe55d9087cdfce20ebdd74b8610f
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:95'272 bytes
First seen:2024-07-12 03:46:43 UTC
Last seen:Never
File type:Rich Text Format (RTF) rtf
MIME type:text/rtf
ssdeep 384:nVyE+1+h5MyFEHm6U8MpkmNBpi6WbOmwazu9vbz182xgO1DqsNT:nvAuueEG7pkmTWb9MvX1HggJ
TLSH T1CC93244CD78F44A6CF64A277432A0A8886FCB77EB60515B5706C93B537ECC2D40A697C
Reporter zbetcheckin
Tags:CVE-2017-11882 rtf

Intelligence

File Origin
# of uploads :
1
# of downloads :
101
Origin country :
FR FR
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
99a37b119f17a69497cd85b20466e078ffe63573266437bd62cbec91205465e2.rtf
Verdict:
No threats detected
Analysis date:
2024-07-12 03:51:16 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/1ba1a2d2-9040-4a36-970d-3a77c687af7a

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Legit
File type:
application/rtf
Has a screenshot:
False
Contains macros:
False
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

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

Verdict:
Malicious
Score:
81.4%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6690a7376df1b20b8ec48f06win7simulatehigh_evasion
Tags:
Stealth Agent
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
DNS request
Connection attempt
Sending a custom TCP request
Creating a process with a hidden window
Launching a service
Connection attempt by exploiting the app vulnerability
Creating a process from a recently created file
Result
Verdict:
Malicious
File Type:
RTF File
Link:
https://app.docguard.net/99a37b119f17a69497cd85b20466e078ffe63573266437bd62cbec91205465e2/results/dashboard
Behaviour
BlacklistAPI detected
Verdict:
Malicious
Threat level:
  10/10
Confidence:
88%
Tags:
embedequation exploit shellcode
Link:
https://www.filescan.io/uploads/6690a7367a9d16520070a768/reports/b7fd4cb2-a6bd-441e-8c50-8a1992a1292f/overview
Verdict:
Malicious
Labled as:
CVE-2017-11882
Link:
https://www.hybrid-analysis.com/sample/99a37b119f17a69497cd85b20466e078ffe63573266437bd62cbec91205465e2
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/1471976
Signature
.NET source code contains potential unpacker
.NET source code references suspicious native API functions
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Contains functionality to bypass UAC (CMSTPLUA)
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
Installs new ROOT certificates
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for submitted file
Obfuscated command line found
Office drops RTF file
Office equation editor establishes network connection
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
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: HackTool - CrackMapExec PowerShell Obfuscation
Sigma detected: Potential PowerShell Command Line Obfuscation
Sigma detected: PowerShell Base64 Encoded FromBase64String Cmdlet
Sigma detected: Remcos
Sigma detected: Script Initiated Connection to Non-Local Network
Sigma detected: Suspicious Microsoft Office Child Process
Sigma detected: WScript or CScript Dropper
Snort IDS alert for network traffic
Suspicious execution chain found
Suspicious powershell command line found
System process connects to network (likely due to code injection or exploit)
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
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 1471976 Sample: swCQS5MMLX.rtf Startdate: 12/07/2024 Architecture: WINDOWS Score: 100 62 Snort IDS alert for network traffic 2->62 64 Multi AV Scanner detection for domain / URL 2->64 66 Found malware configuration 2->66 68 27 other signatures 2->68 9 WINWORD.EXE 336 18 2->9         started        process3 file4 36 C:\Users\...\~WRD0000.tmp:Zone.Identifier, ASCII 9->36 dropped 38 C:\Users\user\Desktop\~WRD0000.tmp, Rich 9->38 dropped 40 C:\Users\user\Desktop\swCQS5MMLX.rtf (copy), Rich 9->40 dropped 42 ~WRF{B8339E90-0004...0-391BE840EC4E}.tmp, Composite 9->42 dropped 12 EQNEDT32.EXE 12 9->12         started        process5 dnsIp6 54 139.99.220.222, 49161, 49165, 80 OVHFR Canada 12->54 44 C:\...\crosscheckrosefloweronhairbeauty.vBS, Unicode 12->44 dropped 98 Office equation editor establishes network connection 12->98 100 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 12->100 17 wscript.exe 11 12->17         started        file7 signatures8 process9 dnsIp10 48 pastecode.dev 17->48 50 pastecode.dev 172.66.40.229, 443, 49162 CLOUDFLARENETUS United States 17->50 70 System process connects to network (likely due to code injection or exploit) 17->70 72 Suspicious powershell command line found 17->72 74 Wscript starts Powershell (via cmd or directly) 17->74 76 5 other signatures 17->76 21 powershell.exe 12 5 17->21         started        signatures11 process12 dnsIp13 52 ia803405.us.archive.org 207.241.232.195, 443, 49163, 49164 INTERNET-ARCHIVEUS United States 21->52 78 Writes to foreign memory regions 21->78 80 Suspicious execution chain found 21->80 82 Injects a PE file into a foreign processes 21->82 25 RegAsm.exe 21->25         started        28 RegAsm.exe 3 13 21->28         started        32 RegAsm.exe 21->32         started        34 RegAsm.exe 21->34         started        signatures14 process15 dnsIp16 84 Contains functionality to bypass UAC (CMSTPLUA) 25->84 86 Contains functionality to steal Chrome passwords or cookies 25->86 88 Contains functionality to register a low level keyboard hook 25->88 96 2 other signatures 25->96 56 sembe.duckdns.org 28->56 58 sembe.duckdns.org 194.187.251.115, 14645, 49166 M247GB United Kingdom 28->58 60 geoplugin.net 178.237.33.50, 49167, 80 ATOM86-ASATOM86NL Netherlands 28->60 46 C:\Users\user\AppData\Local\Temp\...\nots.dat, data 28->46 dropped 90 Detected Remcos RAT 28->90 92 Installs a global keyboard hook 28->92 file17 94 Uses dynamic DNS services 56->94 signatures18
Score:
100%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/99a37b119f17a69497cd85b20466e078ffe63573266437bd62cbec91205465e2
Detection:
cve-2017-11882-shellcode
Create hunting rule
Link:
https://mwdb.cert.pl/sample/99a37b119f17a69497cd85b20466e078ffe63573266437bd62cbec91205465e2/
Threat name:
Document-RTF.Exploit.CVE-2017-11882
Create hunting rule
Status:
Malicious
First seen:
2024-07-11 06:45:37 UTC
File Type:
Document
Extracted files:
4
AV detection:
15 of 24 (62.50%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=tgrxwem7c6tjjf6nqwzaizxapd76mnltezsdpplczpwjcicumxra._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
execution
Link:
https://tria.ge/reports/240712-eb7dmazcqh/
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
Command and Scripting Interpreter: PowerShell
Enumerates physical storage devices
Drops file in Windows directory
Drops file in System32 directory
Blocklisted process makes network request
Verdict:
Suspicious
Tags:
n/a
YARA:
n/a
Link:
https://app.threat.zone/submission/68790d30-5753-4751-8fa2-187ed1a1ef37
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Legit
Score:
0.29
Link:
https://yomi.yoroi.company/submissions/99a37b119f17a69497cd85b20466e078ffe63573266437bd62cbec91205465e2

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 99a37b119f17a69497cd85b20466e078ffe63573266437bd62cbec91205465e2

(this sample)

RemcosRAT

Visual Basic Script (vbs) vbs 06051fcdf49ca8dc96fecde6f1477cde2994a01f899ea063072e3c77789845fc

  
Delivery method
Distributed via web download
  
URLhaus
https://urlhaus.abuse.ch/url/2950829/
  
Dropping
SHA256 06051fcdf49ca8dc96fecde6f1477cde2994a01f899ea063072e3c77789845fc
  
Dropping
MD5 7921681c6200952fdf2db1a77381ac24

Comments


Avatar
zbet commented on 2024-07-12 03:46:44 UTC

url : hxxp://139.99.220.222/55066/hm/hm.hm.hm.hmhmhm.doc