MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 bb6aa1136031783b6a94b84d8fd97c752126067113cd2c764b6176cf5e4cbf7e. 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 3 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: bb6aa1136031783b6a94b84d8fd97c752126067113cd2c764b6176cf5e4cbf7e
SHA3-384 hash: bffdd8a4b584e6ef23811970ec3238d3e0a5fd7c277645079370309c75947694daa9936a6eb73267f1fe8bf3ba5c933a
SHA1 hash: 7e3de542f79118f276f50d46ae4a491e33395dad
MD5 hash: 6a1c0cb2c30f2bd30ac02506afd5701a
humanhash: kilo-glucose-white-equal
File name:microsoftdeletedentirehistorycachecookiefromthepc.Doc
Download: download sample
Signature RemcosRAT
Create hunting rule
File size:50'536 bytes
First seen:2023-12-01 18:10:24 UTC
Last seen:Never
File type:Word file doc
MIME type:text/plain
ssdeep 1536:j+GKFijqk7mY+K/Af3Q8TDuOyVv9O8GZOj:VQK/Af3QMDus8GZOj
TLSH T14333F32A774E4D25E765EA77415D8A8E4EFCF73A32C140D0BABCA3743B2D50E8A61074
Reporter Anonymous
Tags:CVE-2017-11882 doc RemcosRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
137
Origin country :
DE DE
Vendor Threat Intelligence
Malware family:
remcos
Create hunting rule
ID:
1
File name:
Transferencia Interbancaria.xls
Verdict:
Malicious activity
Analysis date:
2023-12-01 18:01:44 UTC
Tags:
phishing phishing-pdf opendir exploit cve-2017-11882 loader rat remcos remote stealer
Link:
https://app.any.run/tasks/bc0368be-112e-4329-bbbc-51df8e5b77bf

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
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

Sanesecurity.Malware.28765.RtfHeur.ObjUpd.UNOFFICIAL
Create hunting rule

Sanesecurity.Shelter.Malware.BadRtf.ObjUpd.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
Searching for synchronization primitives
Creating a window
Сreating synchronization primitives
Launching a process
Creating a file in the %AppData% directory
Enabling the 'hidden' option for recently created files
Adding an access-denied ACE
Creating a file in the %temp% directory
Creating a process with a hidden window
Forced shutdown of a system process
Sending an HTTP GET request to an infection source by exploiting the app vulnerability
Creating a process from a recently created file
Enabling autorun by creating a file
Verdict:
Malicious
Labled as:
CVE-2017-11882
Link:
https://www.hybrid-analysis.com/sample/bb6aa1136031783b6a94b84d8fd97c752126067113cd2c764b6176cf5e4cbf7e
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/1352066
Signature
.NET source code contains method to dynamically call methods (often used by packers)
.NET source code contains potential unpacker
Adds a directory exclusion to Windows Defender
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
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
Delayed program exit found
Found malware configuration
Initial sample is an obfuscated RTF file
Injects a PE file into a foreign processes
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 equation editor drops PE file
Office equation editor establishes network connection
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Powershell uses Background Intelligent Transfer Service (BITS)
Searches for Windows Mail specific files
Shellcode detected
Sigma detected: EQNEDT32.EXE connecting to internet
Sigma detected: File Dropped By EQNEDT32EXE
Sigma detected: Remcos
Sigma detected: Scheduled temp file as task from temp location
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 schtasks.exe or at.exe to add and modify task schedules
Writes to foreign memory regions
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: 1352066 Sample: microsoftdeletedentirehisto... Startdate: 02/12/2023 Architecture: WINDOWS Score: 100 64 Initial sample is an obfuscated RTF file 2->64 66 Multi AV Scanner detection for domain / URL 2->66 68 Found malware configuration 2->68 70 20 other signatures 2->70 8 EQNEDT32.EXE 12 2->8         started        13 taskeng.exe 2->13         started        15 WINWORD.EXE 291 16 2->15         started        process3 dnsIp4 62 107.173.143.18, 49161, 80 AS-COLOCROSSINGUS United States 8->62 52 C:\Users\user\AppData\Roaming\wlanext.exe, PE32 8->52 dropped 54 C:\Users\user\AppData\...\wlanext[1].exe, PE32 8->54 dropped 106 Office equation editor establishes network connection 8->106 108 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 8->108 17 wlanext.exe 1 10 8->17         started        21 THyRDBlZfnr.exe 13->21         started        56 ~WRF{53E19547-D3A4...2-12E04CDDB47B}.tmp, Composite 15->56 dropped file5 signatures6 process7 file8 48 C:\Users\user\AppData\...\THyRDBlZfnr.exe, PE32 17->48 dropped 50 C:\Users\user\AppData\Local\...\tmpCF32.tmp, XML 17->50 dropped 72 Multi AV Scanner detection for dropped file 17->72 74 Machine Learning detection for dropped file 17->74 76 Uses schtasks.exe or at.exe to add and modify task schedules 17->76 78 Injects a PE file into a foreign processes 17->78 23 vbc.exe 3 10 17->23         started        27 powershell.exe 4 17->27         started        29 powershell.exe 4 17->29         started        31 schtasks.exe 17->31         started        80 Writes to foreign memory regions 21->80 82 Allocates memory in foreign processes 21->82 84 Adds a directory exclusion to Windows Defender 21->84 33 powershell.exe 21->33         started        35 powershell.exe 21->35         started        37 schtasks.exe 21->37         started        39 3 other processes 21->39 signatures9 process10 dnsIp11 58 grantadistciaret.com 91.92.247.119, 3212, 49164, 49165 THEZONEBG Bulgaria 23->58 60 geoplugin.net 178.237.33.50, 49166, 80 ATOM86-ASATOM86NL Netherlands 23->60 86 Contains functionality to bypass UAC (CMSTPLUA) 23->86 88 Tries to steal Mail credentials (via file registry) 23->88 90 Contains functionality to steal Chrome passwords or cookies 23->90 96 5 other signatures 23->96 41 vbc.exe 23->41         started        44 vbc.exe 23->44         started        46 vbc.exe 23->46         started        92 Installs new ROOT certificates 27->92 94 Powershell uses Background Intelligent Transfer Service (BITS) 27->94 signatures12 process13 signatures14 98 Tries to steal Instant Messenger accounts or passwords 41->98 100 Tries to steal Mail credentials (via file / registry access) 41->100 102 Searches for Windows Mail specific files 41->102 104 Tries to harvest and steal browser information (history, passwords, etc) 44->104
Score:
99%
Verdict:
Malware
File Type:
ASCII
Link:
https://malprob.io/report/bb6aa1136031783b6a94b84d8fd97c752126067113cd2c764b6176cf5e4cbf7e
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/bb6aa1136031783b6a94b84d8fd97c752126067113cd2c764b6176cf5e4cbf7e/
Threat name:
Document-OLE.Exploit.CVE-2017-11882
Create hunting rule
Status:
Malicious
First seen:
2023-12-01 18:11:05 UTC
File Type:
Document
Extracted files:
4
AV detection:
14 of 23 (60.87%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=xnvkce3agf4dw2uuxbgy7wl4ouqsmbtrcpgsy5slmf3m6xsmx57a._file
Malware family:
Remcos
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/bb6aa1136031/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/bb6aa1136031783b6a94b84d8fd97c752126067113cd2c764b6176cf5e4cbf7e

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
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.

  
Delivery method
Other
  
URLhaus
https://urlhaus.abuse.ch/url/2736747/

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