Office (OOXML) malware analysis — malicious · 53c2a0f740c42919

MALICIOUS

Office (OOXML)

62.5 KB Created: 2018-09-09 12:27:30 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2020-05-25

MD5: f22d07ac9d6fe25417ac79b16e03d7be SHA-1: 1ecfbb529124313d9a88832ea24d45829d6092c1 SHA-256: 53c2a0f740c42919b8f91a8e6cf65f41f047d14c8cf4312c842ecab192cdb469

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate this object exploits CVE-2018-0798 due to anomalous native stream data and high entropy. The document body contains a lure to 'ENABLE EDITING', suggesting the embedded object is intended to execute malicious code upon user interaction. No specific family is identifiable from the provided evidence.

Heuristics 5

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.
CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY

Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
Embedded OLE object medium OOXML_OLE_OBJECT

Document contains an embedded OLE object
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
Suspicious extracted artifact medium 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	4096 bytes
SHA-256: `856d72e5dd303b8455bc262068f8c4a0369b5b63e09ad12ca8838a3f46f7e018`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10NatiVE	1597 bytes
SHA-256: `c431f2032fff849e7df301ff34a1e80042ce6addb0a285c41b0112105e10e174`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL

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