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

Static analysis result for SHA-256 27d51cdbad320f4d…

MALICIOUS

Office (OOXML) / .XLSX

605.3 KB Created: 2021-10-11 13:45:42 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-08-31
MD5: db702e42db8114a72403a5a10c70ae25 SHA-1: 326faa4e0b7a2a0c0c21c6a0151c108ae2fd4e33 SHA-256: 27d51cdbad320f4dfc01dd58939eca3b8300a8e2c3bd3daca1441232a3775c42
100 Risk Score

Malware Insights

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

The sample is an Excel file 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, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. The document body contains what appears to be a list of cellular store locations and phone numbers, likely a lure to disguise the malicious nature of the file.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/POe.sDr3 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
c4a3029639c6336fd0707311f62aeb143628acb8abb627bed8dd8343a4fe7c39		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/POe.sDr3 822784 bytes
ooxml_oleobject_00_ole10native_00.bin
8816ddc2e227b73ed6e71546aed7ad2d524a52d8b66f512cc1ca3dd6ed9b981e		 ole-package OOXML xl/embeddings/POe.sDr3 Ole10Native stream: OlE10nAtiVe 813937 bytes

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