Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 c2ec8238c7c31d81…

MALICIOUS

Office (OLE) / .XLSX

70.0 KB Created: 2001-06-07 01:11:42 Authoring application: Microsoft Excel
MD5: fab5d2f3c2c8e2393b6859ddc9a59359 SHA-1: d2e0d7fb458b870f18804e15bc9a1729ba8fd28b SHA-256: c2ec8238c7c31d816344e46449b9a3b6541e6192b352079c4424778dd05276a8
342 Risk Score

Malware Insights

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

The sample is a malicious Excel file containing VBA macros. The Workbook_Open macro executes code that attempts to establish persistence by modifying the NormalTemplate and creating a copy of itself in the Excel startup path ('Book1.'). It also attempts to write to registry keys related to Excel startup settings. The embedded URLs are likely related to the malware's command and control or payload delivery, though they could not be fully resolved. The script's obfuscation and persistence mechanisms are indicative of a downloader or backdoor trojan.

Heuristics 9

  • ClamAV: Win.Trojan.W97M-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.W97M-2
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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 high 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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://www.sourceofkaos.com/homes/1nternal�
    • http://www.sourceofkaos.com/homes/1nternal

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
29f58a9da7181cc6da538021388776a73f899b8e010fb6f89217e4abfadc9f38		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 35736 bytes
Detection
ClamAV: Doc.Trojan.Hopper-12
Obfuscation or payload: likely
Carved artifact contains 66 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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