Office (OOXML) malware analysis — malicious · 9efe3fed36b90615

MALICIOUS

Office (OOXML)

45.5 KB Created: 2017-05-10 06:52:46 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2019-01-11

MD5: 910000e74e3b0954d2ce23c2c5883350 SHA-1: 99d010e702f7740e7dbac6806e157fb68c50c087 SHA-256: 9efe3fed36b906153b16a349abdd040028cb1446fae20b3c6b63b4723a2edbdc

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an Excel document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate this object is anomalous and exploits CVE-2018-0798, a vulnerability in the Equation Editor. This exploit likely leads to the execution of a second-stage payload, as suggested by the 'Shellcode candidate region' heuristic.

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: `b1c74c4e9939f28693157fa3733bf04aeef7d26bb44488913a7e9f22debcbff1`
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	1428 bytes
SHA-256: `b60d66a057d13cc5583526dabcda375872a8d59890aea6dbd910f5a4dd1bfb77`
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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