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

Static analysis result for SHA-256 bad3a2ccc347c67e…

MALICIOUS

Office (OOXML) / .XLSX

907.6 KB Created: 2012-07-25 13:58:16 UTC Authoring application: Microsoft Excel 14.0300
MD5: 019a5a98dc7217c7494b827a73648a29 SHA-1: 535ee0e594b5ac42faf2dc7fdd59af5a9f8d6ad3 SHA-256: bad3a2ccc347c67ef40a0d1016d3b11a11e5bc598c6fec3b58e1a1ac502db919
100 Risk Score

Malware Insights

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

The high-severity heuristics indicate the presence of an embedded OLE object, specifically an Equation Editor object, which is a common vector for exploiting vulnerabilities. The anomaly in the Ole10Native stream suggests it carries a payload. While no specific family is identified, this pattern is typical of macro-enabled documents used for initial access.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin 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
cf18f478def4be70a179db524a43fb74fa9fe881eb6d2142d9e37d533864e3ac		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 852480 bytes
ooxml_oleobject_00_ole10native_00.bin
983a2578c70ebebba7a28b228c89a1866fa5c58dec35f2500651345042e134d6		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10NATiVe 843378 bytes

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