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

Static analysis result for SHA-256 a0e8d9a88267b3c3…

MALICIOUS

Office (OLE) / .XLS

143.3 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 1f7f2f105b9477c28e89f0acebf98564 SHA-1: 298e85b171c3d6a290bfb27e83bc9917395e071c SHA-256: a0e8d9a88267b3c34f5a410af0f53a6b89febdc99a07440cd4e10a974016078e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The sample is an Excel spreadsheet exhibiting a large slack space anomaly, indicative of potential obfuscation or embedded malicious content. Heuristics indicate the use of Windows API functions such as CreateProcess, LoadLibrary, and GetProcAddress, suggesting the file is designed to execute arbitrary code. The document body contains seemingly benign text about application forms, likely a lure to mask the malicious intent. No scripts were extracted from this sample.

Heuristics 5

  • Reference to CreateProcess API high SC_STR_CREATEPROCESS
    Reference to CreateProcess API
  • Reference to LoadLibrary API high SC_STR_LOADLIBRARY
    Reference to LoadLibrary API
  • Reference to GetProcAddress API high SC_STR_GETPROCADDRESS
    Reference to GetProcAddress API
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 146,778 bytes but its declared streams total only 21,308 bytes — 125,470 bytes (85%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
  • 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://crl.microsoft.com/pki/crl/products/tspca.crl0H
    • http://www.microsoft.com/pki/certs/tspca.crt0
    • http://crl.microsoft.com/pki/crl/products/WinIntPCA.crl0U
    • http://www.microsoft.com/pki/certs/MicrosoftWinIntPCA.crt0
    • http://update.microsoft.com/windowsupdate

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