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

Static analysis result for SHA-256 4f525befa02ffeb5…

MALICIOUS

Office (OOXML) / .XLSX

655.9 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-04-07
MD5: f21fe012be738f9abae398aaf86ad590 SHA-1: 50e6c52487af35d80959c3fe634b49b2abfa6bf7 SHA-256: 4f525befa02ffeb5f89996e1927e9a8e395e9af63890429f56a0d69b98890370
100 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as an 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 vulnerability within the Equation Editor to execute arbitrary code, likely to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ZP2ObKR.T3R 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
9c2d16134f6637d6bd3fd491e0a93e77e18c61ff89d279b05fcd79cd0c0752eb		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ZP2ObKR.T3R 953856 bytes
ooxml_oleobject_00_ole10native_00.bin
8aa1e1602aa1ebbd811e5f0ae4ae494fd3d4189e7aca5d6656ebecb249764191		 ole-package OOXML xl/embeddings/ZP2ObKR.T3R Ole10Native stream: OLe10nATive 943780 bytes

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