MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 101a5477169067b0d4df475dca5ed8ae2c99b3916664b6d32aeb5113541ee5be. 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: 10


Maldoc score: 5


Intelligence 10 IOCs YARA 3 File information Comments

SHA256 hash: 101a5477169067b0d4df475dca5ed8ae2c99b3916664b6d32aeb5113541ee5be
SHA3-384 hash: 878f2871950f4c7ea0ab900d323c9b70ea4a1f5e1f05b86a50f1c13febfafb57633bf8eda73b85a36d9d55d70cd01113
SHA1 hash: 18e19652397825e8b3c4dc3091930bda086e8ce5
MD5 hash: 8698a9ea35b8079c09b383c67a0eb0ad
humanhash: leopard-whiskey-virginia-montana
File name:Holdings.doc
Download: download sample
Signature RemcosRAT
File size:71'168 bytes
First seen:2022-04-05 05:18:45 UTC
Last seen:Never
File type:Word file doc
MIME type:application/msword
ssdeep 768:2zPYL8Mq0Q0G0U0i0g023tX+xw+teiZTaiZkiZ:YPYL8MAUxrtf
TLSH T19D63437079F2C617D56E0839A9468A1B79B4EC975F93968B3E7B3F1926310E00721F2C
Reporter abuse_ch
Tags:doc RemcosRAT

Office OLE Information


This malware samples appears to be an Office document. The following table provides more information about this document using oletools and oledump.

OLE id
Maldoc score: 5
OLE dump

MalwareBazaar was able to identify 29 sections in this file using oledump:

Section IDSection sizeSection name
1114 bytesCompObj
2260 bytesDocumentSummaryInformation
3404 bytesSummaryInformation
412999 bytes1Table
55793 bytesData
6369 bytesMacros/PROJECT
741 bytesMacros/PROJECTwm
81774 bytesMacros/VBA/ThisDocument
92435 bytesMacros/VBA/_VBA_PROJECT
10513 bytesMacros/VBA/dir
1177 bytesObjectPool/_1710587586/CompObj
1220 bytesObjectPool/_1710587586/Ole
135 bytesObjectPool/_1710587586/Ole10ItemName
144516 bytesObjectPool/_1710587586/Ole10Native
156 bytesObjectPool/_1710587586/ObjInfo
164564 bytesObjectPool/_1710587586/PRINT
1777 bytesObjectPool/_1710587587/CompObj
1820 bytesObjectPool/_1710587587/Ole
195 bytesObjectPool/_1710587587/Ole10ItemName
204516 bytesObjectPool/_1710587587/Ole10Native
216 bytesObjectPool/_1710587587/ObjInfo
224564 bytesObjectPool/_1710587587/PRINT
2377 bytesObjectPool/_1710587588/CompObj
2420 bytesObjectPool/_1710587588/Ole
255 bytesObjectPool/_1710587588/Ole10ItemName
264516 bytesObjectPool/_1710587588/Ole10Native
276 bytesObjectPool/_1710587588/ObjInfo
284564 bytesObjectPool/_1710587588/PRINT
299780 bytesWordDocument
OLE vba

MalwareBazaar was able to extract and deobfuscate VBA script(s) the following information from OLE objects embedded in this file using olevba:

TypeKeywordDescription
AutoExecAutoOpenRuns when the Word document is opened
IOCOPOR.msiExecutable file name
SuspiciousCreateObjectMay create an OLE object
SuspiciouswindowsMay enumerate application windows (if combined with Shell.Application object)

Intelligence


File Origin
# of uploads :
1
# of downloads :
230
Origin country :
n/a
Vendor Threat Intelligence
Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Creating a window
Сreating synchronization primitives
DNS request
Sending a custom TCP request
Creating a file in the Windows subdirectories
Creating a file in the %temp% subdirectories
Launching a process
Creating a process with a hidden window
Moving a file to the %temp% subdirectory
Creating a process from a recently created file
Running batch commands
Using the Windows Management Instrumentation requests
Result
Verdict:
Malicious
File Type:
Legacy Word File with Macro
Payload URLs
URL
File name
https://filebin.net/0hcps6l97xnwswv6/OPOR.msi
ThisDocument
Document image
Document image
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
advpack.dll cmd.exe control.exe expand.exe explorer.exe fingerprint macros macros-on-open rundll32.exe setupapi.dll shell32.dll
Label:
Malicious
Suspicious Score:
7.7/10
Score Malicious:
77%
Score Benign:
23%
Result
Verdict:
MALICIOUS
Details
Macro with Startup Hook
Detected macro logic that will automatically execute on document open. Most malware contains some execution hook.
Document With Few Pages
Document contains between one and three pages of content. Most malicious documents are sparse in page count.
Macro Execution Coercion
Detected a document that appears to social engineer the user into activating embedded logic.
Macro Contains Suspicious String
Detected a macro with a suspicious string. Suspicious strings include privileged function calls, obfuscations, odd registry keys, etc...
Document With Minimal Content
Document contains less than 1 kilobyte of semantic information.
Result
Threat name:
Detection:
malicious
Classification:
expl.troj
Score:
100 / 100
Signature
Antivirus detection for dropped file
Antivirus detection for URL or domain
Document contains OLE streams with names of living off the land binaries
Document contains OLE streams with PE executables
Machine Learning detection for dropped file
Machine Learning detection for sample
Malicious sample detected (through community Yara rule)
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)
Powershell drops PE file
Yara detected Remcos RAT
Behaviour
Behavior Graph:
behaviorgraph top1 signatures2 2 Behavior Graph ID: 603056 Sample: Holdings.doc Startdate: 05/04/2022 Architecture: WINDOWS Score: 100 79 Multi AV Scanner detection for domain / URL 2->79 81 Malicious sample detected (through community Yara rule) 2->81 83 Antivirus detection for URL or domain 2->83 85 9 other signatures 2->85 9 msiexec.exe 87 31 2->9         started        13 WINWORD.EXE 48 47 2->13         started        15 rundll32.exe 2->15         started        17 3 other processes 2->17 process3 dnsIp4 69 filebin.net 185.47.40.36, 443, 49760, 49765 REDPILL-LINPRORedpillLinproNO Norway 9->69 71 situla.bitbit.net 87.238.33.7, 443, 49761, 49766 REDPILL-LINPRORedpillLinproNO Norway 9->71 53 C:\Windows\Installer\MSID43B.tmp, PE32 9->53 dropped 55 C:\Windows\Installer\MSI46E0.tmp, PE32 9->55 dropped 57 C:\Windows\Installer\MSI344F.tmp, PE32 9->57 dropped 19 msiexec.exe 5 9->19         started        59 C:\Users\user\AppData\...\Holdings.doc.LNK, MS 13->59 dropped 61 C:\Users\user\...\~DF1ADFC6449DA52C0C.TMP, Composite 13->61 dropped 21 splwow64.exe 13->21         started        23 splwow64.exe 13->23         started        file5 process6 process7 25 OPOR.exe 1 3 19->25         started        27 expand.exe 8 19->27         started        30 icacls.exe 1 19->30         started        32 2 other processes 19->32 file8 34 cmd.exe 1 25->34         started        63 C:\...\31549dc0a1aa9847b21d406d91e2b10a.tmp, PE32+ 27->63 dropped 65 C:\Users\user\AppData\...\OPOR.exe (copy), PE32+ 27->65 dropped 36 conhost.exe 27->36         started        38 conhost.exe 30->38         started        40 conhost.exe 32->40         started        42 conhost.exe 32->42         started        process9 process10 44 powershell.exe 14 17 34->44         started        48 powershell.exe 22 34->48         started        51 conhost.exe 34->51         started        dnsIp11 73 filebin.net 44->73 75 situla.bitbit.net 44->75 67 C:\Users\user\AppData\Local\Temp\...\OPOR.exe, PE32 44->67 dropped 77 Powershell drops PE file 48->77 file12 signatures13
Threat name:
Win32.Trojan.Mutisedow
Status:
Malicious
First seen:
2022-04-05 05:19:09 UTC
File Type:
Document
Extracted files:
47
AV detection:
6 of 41 (14.63%)
Threat level:
  5/5
Result
Malware family:
n/a
Score:
  8/10
Tags:
macro macro_on_action
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Modifies registry class
Suspicious behavior: AddClipboardFormatListener
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Office loads VBA resources, possible macro or embedded object present
Drops file in Windows directory
Blocklisted process makes network request
Please note that we are no longer able to provide a coverage score for Virus Total.

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:Office_AutoOpen_Macro
Author:Florian Roth
Description:Detects an Microsoft Office file that contains the AutoOpen Macro function
Rule name:SUSP_Doc_WindowsInstaller_Call_Feb22_1
Author:Nils Kuhnert
Description:Triggers on docfiles executing windows installer. Used for deploying ThinBasic scripts.
Reference:https://inquest.net/blog/2022/02/24/dangerously-thinbasic
Rule name:susp_lure_xls_WindowsInstaller_Feb2021_1
Author:Nils Kuhnert
Description:Triggers on docfiles executing windows installer. Used for deploying ThinBasic scripts.
Reference:https://twitter.com/threatinsight/status/1497355737844133895

File information


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

Comments