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

Static analysis result for SHA-256 f4b3a968d9d8c482…

MALICIOUS

Office (OLE) / .XLS

1.46 MB
MD5: c78d707a827b963272a5c79b6a441573 SHA-1: 0fe4da276fcbd16e1eafd537360c62b6b7aa972d SHA-256: f4b3a968d9d8c482182af366d3e23c17353329f82c328a7e413932451d492a91
180 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The presence of an embedded SWF file within the OLE document, along with references to LoadLibrary and GetProcAddress APIs, strongly indicates the execution of malicious code. The document body is heavily corrupted, but the embedded SWF and API calls suggest a downloader or exploit delivery mechanism. The unknown reputation URLs are also suspicious.

Heuristics 5

  • Embedded Adobe Flash (SWF) in OLE document critical OFFICE_EMBEDDED_SWF
    Document contains an embedded Adobe Flash (SWF) object. Vulnerabilities such as CVE-2018-4878 and CVE-2018-15982 involved Flash objects embedded in Office files. Adobe Flash has been end-of-life since December 2020.
  • 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 1,534,976 bytes but its declared streams total only 56,346 bytes — 1,478,630 bytes (96%) 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://www.zone-archive.com
    • http://www.hentaikey.com/sys/members/signup.php?referal=7299
    • 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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