Office (OOXML) malware analysis — malicious · 88452dd26736b963

MALICIOUS

Office (OOXML)

107.9 KB Created: 2019-10-24 08:51:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2020-05-25

MD5: c9ac33dd91825993173c8b64c49e8d5e SHA-1: 46e66f5d28a65e26a047a00530bcede6b310ce24 SHA-256: 88452dd26736b963a7d863e5f6bac39df49371746e9fbf5c49ed509adf1e5b4a

102 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate this object carries a payload-like stream with an anomalous size, strongly suggesting exploitation of a vulnerability within the Equation Editor. This technique is commonly used to achieve arbitrary code execution on the victim's machine.

Heuristics 4

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
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	105984 bytes
SHA-256: `2eb878b905a144cd86120f28d6f7368541e2c8e20c44979ba3de25b3aefa3aa4`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.96, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10NatIVe	102466 bytes
SHA-256: `c6de3dab113310c1b5f9d9d522ff368e52725273515d34270855b4b46a78f211`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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