Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 dd07f2a12d5b03fe…

MALICIOUS

Office (OLE)

145.5 KB
MD5: 0ceb65be2db9bd730913de4d3654ebbd SHA-1: 77648ea0baf46665259b7d39a68edfceeca91fab SHA-256: dd07f2a12d5b03fea566f579cb3f669f382a9c696d4507129d49d5243f635dc5
140 Risk Score

Malware Insights

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

The sample is an OLE document with a significant slack space anomaly, indicating potential obfuscation or embedded malicious content. Heuristics indicate the use of VirtualAlloc, LoadLibrary, and GetProcAddress APIs, suggesting the dynamic loading and execution of code. While no specific malicious URLs or scripts were extracted, the API calls strongly imply the execution of a secondary payload. The document body appears to be corrupted or heavily encoded, preventing a more specific analysis of its lure.

Heuristics 5

  • 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 148,992 bytes but its declared streams total only 56,346 bytes — 92,646 bytes (62%) 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 VirtualAlloc API medium SC_STR_VIRTUALALLOC
    Reference to VirtualAlloc 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://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

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