Office (OOXML) malware analysis — malicious · dd809c885e40c69e

MALICIOUS

Office (OOXML)

25.4 KB Created: 2019-07-22 18:46:12 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2019-11-20

MD5: 46634a7ab8d01201f03fdda400880e82 SHA-1: 2b531560a3acf7319ada18570e2379b243535776 SHA-256: dd809c885e40c69e2a263f4f6accbfb94519b7c467f23c5f022f80372bde558d

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an OOXML document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798 due to an anomalous Equation Editor native stream. This suggests the document is designed to exploit this vulnerability to execute a secondary payload, likely shellcode, as indicated by the static triage findings. The document body content appears to be a fabricated order or price list, likely a lure.

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.
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
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	3584 bytes
SHA-256: `0b5c69fe4d35bd7da2c3947bdf37fce88cae1235a58843de8284f4cc8fe473a2`
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	1526 bytes
SHA-256: `eac1996ad3eea346cd43243b886a15834b381eee48452789062fe0557768920e`
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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