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

Static analysis result for SHA-256 93dd2ae7f3871e56…

MALICIOUS

Office (OLE) / .XLSX

1.28 MB
MD5: e78279b80fb0ec0e2e850fe50eb21040 SHA-1: 088313b1cddf3db251be5fd0de7d516da0a83630 SHA-256: 93dd2ae7f3871e5624029d321e8ed0de2ff2b98ae5079a73e5bee3d647320232
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an encrypted OOXML file that contains an Equation Editor OLE object, a known exploit carrier. The heuristics indicate that this object carries a payload-like stream with an anomalous header and size discrepancy, suggesting it's designed to drop a secondary payload. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic further suggests the document's purpose is to trick the user into providing a password for an archive or attachment, a common tactic to bypass gateway security.

Heuristics 5

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Default-encrypted OOXML embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Default-encrypted OOXML exploit carrier layout high OOXML_ENCRYPTED_EXPLOIT_CARRIER_SHAPE
    Default-password encrypted OOXML package contains embedded OLE object parts and additional activation/decoy parts. This layout is common in malicious Excel exploit delivery and requires inspecting the decrypted package.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Default-encrypted OOXML embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is exploit-shaped Equation/OLE payload evidence.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Office OOXML encrypted with default VelvetSweatshop password medium OFFICE_DEFAULT_PASSWORD_ENCRYPTED_OOXML
    OLE EncryptedPackage decrypts with Excel's built-in VelvetSweatshop password. Office opens this transparently, and malware uses it to hide OOXML exploit parts from scanners that only inspect the outer OLE container.

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