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

Static analysis result for SHA-256 b4c520e8b9f501c4…

MALICIOUS

Office (OLE) / .XLS

294.1 KB
MD5: b081bda6790f23296d1170e4055e3f65 SHA-1: 909767087f3bfb34a7f032f040fd7e840b061425 SHA-256: b4c520e8b9f501c46ba63adbe86ffc986fb911bae657625675e73d24c42626a0
100 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1218 Signed Binary Proxy Execution T1059 Command and Scripting Interpreter

The presence of references to VirtualProtect and LoadLibrary APIs, along with a large slack space anomaly in the OLE structure, indicates the file is likely packed or obfuscated to hide malicious code. The embedded URL, though currently unknown in reputation, is a potential indicator of a download or command-and-control channel. The document body contains VBA code, suggesting macro-based execution is the intended attack vector.

Heuristics 4

  • Reference to LoadLibrary API high SC_STR_LOADLIBRARY
    Reference to LoadLibrary API
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 301,149 bytes but its declared streams total only 56,346 bytes — 244,803 bytes (81%) 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).
  • Reference to VirtualProtect API medium SC_STR_VIRTUALPROTECT
    Reference to VirtualProtect API
  • 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://ocsp.verisign.com0
    • http://www.microsoft.com
    • https://www.verisign.com/rpa
    • http://ocsp.verisign.com/ocsp/status0
    • https://www.verisign.com/rpa0
    • http://crl.microsoft.com/pki/crl/products/CodeSignPCA.crl0
    • http://crl.verisign.com/ThawteTimestampingCA.crl0
    • http://crl.verisign.com/tss-ca.crl0
    • https://www.verisign.com/rpa01
    • http://crl.verisign.com/pca3.crl0
    • http://CSC3-2004-crl.verisign.com/CSC3-2004.crl0D
    • http://CSC3-2004-aia.verisign.com/CSC3-2004-aia.cer0
    • http://www.acdsee.com

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