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

Static analysis result for SHA-256 e5a6b7511661e04f…

MALICIOUS

Office (OOXML) / .XLSX

587.4 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-28
MD5: ae154f56acce28a47e742ebecccd0729 SHA-1: 33b13c3c0e8d920df387504f617b8eca9a420486 SHA-256: e5a6b7511661e04fa6619b9696b23640b0f9ea329313941800768e1d802a2b5b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The sample is an Excel file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. This object carries a payload-like Ole10Native stream with an anomalous header, indicating it's designed to exploit a known vulnerability. The presence of this embedded malicious object strongly suggests the file's purpose is to leverage the Equation Editor exploit to execute a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/wpP4Fyyc6.0QG 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
1f85513e93380635fadd9e185aed6ed8f53da94644f35dd4cab2ca9d75554fe4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/wpP4Fyyc6.0QG 794112 bytes
ooxml_oleobject_00_ole10native_00.bin
24f6d5d69439c13787259b53802f4a93cecd1de54542132801704e791a66f4ed		 ole-package OOXML xl/embeddings/wpP4Fyyc6.0QG Ole10Native stream: Ole10naTIvE 785090 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.