Office (OOXML) malware analysis — malicious · 1656c8b0d2cf6a2c

MALICIOUS

Office (OOXML)

39.1 KB Created: 2019-10-24 08:51:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2020-09-07

MD5: df83dd99902d5cfeb821b47c703f2603 SHA-1: dc132ac636607071efa970451a3ae454972b0a59 SHA-256: 1656c8b0d2cf6a2c990f87b2774a242cccc62ce6b9cd725cc5d5b3ef46585734

102 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an OOXML file 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 Microsoft Equation Editor, to achieve code execution. The embedded object likely contains shellcode, suggesting the document is intended to deliver a malicious payload upon opening.

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 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	35328 bytes
SHA-256: `58e62308baaacdbd772cf0f3320328768a83b159fd271a64d069d4ed1bd794a3`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.80, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10nativE	32292 bytes
SHA-256: `f6d3f952ca8745f41129ca8929120a39345abed7fc7a44d9d20283b34918f8d9`
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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