Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 993b1ae9cd25ddce…

MALICIOUS

Office (OOXML)

597.5 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: a67b8c58b1b5dea32fc103f8745bb4f3 SHA-1: 3eddd5451eed780ec8e50a88d98a5e9ae5841e56 SHA-256: 993b1ae9cd25ddce41f808690dd22a44ea6b11ed86b410c1c1fdbc57370e8a90
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample contains an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size discrepancy, strongly suggesting exploitation. The document body content appears to be a list of part numbers and quantities, which is likely a lure to disguise the malicious embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/KIRUqR7.Ewq contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
89a5931d1fe43ea5c29c8af3fa13218791b6212c0b619977b69f55220ecbbb88		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/KIRUqR7.Ewq 828416 bytes
ooxml_oleobject_00_ole10native_00.bin
e0f5d441c0cfdd6a5d5a9b98473c635029a29616c93d0b63268a2f01c966be80		 ole-package OOXML xl/embeddings/KIRUqR7.Ewq Ole10Native stream: oLe10nATiVe 819647 bytes

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