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

Static analysis result for SHA-256 38cb3b6102cbb8b4…

MALICIOUS

Office (OOXML) / .XLSX

589.6 KB Created: 2024-03-25 10:30:17 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2024-08-16
MD5: 27909e432efc3ee482a8a384ea8be192 SHA-1: 344aaba77d916ad077fd8a2858e0ec028ffcc8d1 SHA-256: 38cb3b6102cbb8b4d341b58c927f7b2eacf08729face2380499c914f44ed6e6a
100 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically identified as a 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 actual stream size. This strongly suggests the exploitation of a known vulnerability within the Equation Editor to deliver a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/6Z3.SrQ 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
ac9a0b2ae9d524490505679809c5c51603b2790d9a83dab659be013aa68bb75a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/6Z3.SrQ 860160 bytes
ooxml_oleobject_00_ole10native_00.bin
e04a4407de5a5923ee3e27e86c24472ffdf0d59220e4bb0983ca9c6028bbaa5d		 ole-package OOXML xl/embeddings/6Z3.SrQ Ole10Native stream: OLe10nAtIvE 850897 bytes

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