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

Static analysis result for SHA-256 34e7b24f517725b4…

MALICIOUS

Office (OOXML) / .XLSX

623.3 KB Created: 2020-01-08 16:45:10 UTC Authoring application: Microsoft Excel 12.0000
MD5: abc8a77f795d6c3c8eb321b91bc5ab70 SHA-1: 76536c8e6524c690a11bac745d53b8c3261c4474 SHA-256: 34e7b24f517725b44378d9ac08979b14304cdd02e28f052a29d26a65a01315dc
100 Risk Score

Malware Insights

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

The sample is an Excel spreadsheet containing an embedded OLE object, specifically identified as an Equation Editor. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significant size discrepancy, strongly suggesting it's a dropper for malicious content. The document body contains what appears to be tabular data, possibly a lure, but the primary malicious functionality is derived from the embedded OLE object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/scCwWlipq.7j 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
2e2318c9177bf685efa8058a4e39f42310683db9a74f761ff7837364526f49be		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/scCwWlipq.7j 889344 bytes
ooxml_oleobject_00_ole10native_00.bin
858659bb3ed12a4d3cd4192c6d850e9b9fdea872495f95625b9f64122881571e		 ole-package OOXML xl/embeddings/scCwWlipq.7j Ole10Native stream: OLe10NatIve 879696 bytes

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