Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 7295bc68a81c243d…

MALICIOUS

Office (OOXML)

13.0 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2020-05-25
MD5: a639fc454af21803a0cda4c9249ea20e SHA-1: daf14ef5c9991b9f04ff30106cc37e590acd7447 SHA-256: 7295bc68a81c243da0b06c6192a261d7f74ec808be241f3a804b6d73a5d139fc
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, a known vulnerability in Equation Editor that allows for arbitrary code execution. This technique is commonly used to deliver secondary payloads, hence the high confidence in an exploitation for client execution attack pattern. No specific family could be identified from the available evidence.

Heuristics 3

  • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
SHA-256: d8d5378382f1f67c67df7c231b3cac685a09022244f9e08df33be888b57ba7bc
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10naTIVE 1739 bytes
SHA-256: decb9f9c1cb998936667badf70bcd4f3ad2956da143bf37e7fca8edbd539aae9

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