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

Static analysis result for SHA-256 fb55bafa76c21f61…

MALICIOUS

Office (OOXML) / .XLSX

742.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-08-02
MD5: 83d4632b840a384ea8d1dd274acc7e30 SHA-1: 75261521fba4cab999892e0b591c607fefcc562e SHA-256: fb55bafa76c21f616b02cf71bd8d9992e552d5951e2531ecb6c168e2c859d042
100 Risk Score

Malware Insights

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

The sample contains an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting it's an exploit for a vulnerability like CVE-2017-11882. The document body, formatted as a purchase order, serves as a lure to encourage interaction with the embedded malicious object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/rcjVH.RcTO3y 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
e36e3d27163bc7c05bd2e36d4d5e2dbc1a2f207b33959aca44f0892f0eeaaf09		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/rcjVH.RcTO3y 1052160 bytes
ooxml_oleobject_00_ole10native_00.bin
a2f2e506c112b3032bb7423dd8e407780f623b49f279915dedd77fad84de6e36		 ole-package OOXML xl/embeddings/rcjVH.RcTO3y Ole10Native stream: OLE10naTivE 1041271 bytes

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