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

Static analysis result for SHA-256 e1f1871c25492a17…

MALICIOUS

Office (OOXML) / .XLSX

688.3 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: 5b9e01bb90e96d34c260be0ea72a03ca SHA-1: dc8e7ca569e3e9260c70ddfd0b68edc629971f11 SHA-256: e1f1871c25492a17d467c51d196a52c53ecf95b8e98c974d77babb5f1649b5f0
100 Risk Score

Malware Insights

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

The XLSX file contains an embedded OLE object identified as an Equation Editor. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header, strongly suggesting it's a vehicle for exploitation. The specific exploit mechanism is likely related to CVE-2017-11882, a known vulnerability in Equation Editor. No further IOCs were extracted.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/WOBo.DXRW 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
22700b99b4b2d376f559f958ec4d37ec7268ad6ebd48ee48d8aab6c236b2b282		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/WOBo.DXRW 1004544 bytes
ooxml_oleobject_00_ole10native_00.bin
29d3ff2dbebe8abe0232d301ab5a718b8b0d856429be53584e295ff3945b7fd5		 ole-package OOXML xl/embeddings/WOBo.DXRW Ole10Native stream: oLe10nativE 994097 bytes

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