Office (OOXML) / .XLSX malware analysis — malicious · 750f91ca352c144b

MALICIOUS

Office (OOXML) / .XLSX

45.9 KB Created: 2019-05-27 22:54:04 UTC Authoring application: Microsoft Excel 16.0300

MD5: 3977e5a124bfcfcff28f2345452f1cf9 SHA-1: 014addf527a8d5739ac062b1604bcdc10ae4cdeb SHA-256: 750f91ca352c144b90bb159998a94f8a2dcb80a8463161217b921d720264c60a

162 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 a vulnerable Equation Editor object. Heuristics indicate exploitation of CVE-2018-0798, which allows for arbitrary code execution. The ClamAV detection confirms its malicious nature, likely acting as a dropper for further malicious activity.

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.
ClamAV: Xls.Malware.Agent-7994762-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Malware.Agent-7994762-0
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` `819d610471af963d2eb187ca3ccbe4a19a22e52a85b88e6a602a2475f4718cc9`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	42496 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.85, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `d3552c901e4992fff5f3a4d35550aa933e1eb175a9e6dc73fb8899e01b504784`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10NativE	39749 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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