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

Static analysis result for SHA-256 3a804b927894664a…

MALICIOUS

Office (OOXML) / .XLSX

655.9 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-31
MD5: e7763931d43404bfd8bcd3edb1e414a2 SHA-1: e63daa9ab1cf44c4256698961ef3d31d7f7171c3 SHA-256: 3a804b927894664ac333de55ecfdf605403cdcc505d158957b14e51eb779f13f
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an OOXML document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the stream size, strongly suggesting exploitation. This technique is commonly used to deliver secondary malware payloads.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/4yuOX0qk.NG7 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
0f02b25ac319a9872e252496f637fcacdb56552df1634dc393aaaf4eb37d0d91		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/4yuOX0qk.NG7 966656 bytes
ooxml_oleobject_00_ole10native_00.bin
28ad65169a40d7e87ff66a37d13ab2520b7dbcfd3fc96874ebda186a20b59104		 ole-package OOXML xl/embeddings/4yuOX0qk.NG7 Ole10Native stream: oLE10naTiVe 956618 bytes

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