Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c1534207b5e3d75d…

MALICIOUS

Office (OOXML)

59.4 KB Created: 2018-06-17 08:38:16 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2018-10-07
MD5: 7df65f87877d3609858c81aec17bcdfa SHA-1: 116ab41a21ca198065002c22d5d9af39333c29ea SHA-256: c1534207b5e3d75d76809bc016c26c2fe2511d258e35a23481537cfe432db20a
100 Risk Score

Malware Insights

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

The sample contains an embedded OLE object identified as a Microsoft Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which allows for arbitrary code execution. This is a common technique for delivering malicious payloads via spearphishing attachments.

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 3584 bytes
SHA-256: 3fcda8985ad0ae5796ade90674b8cbfd6d5c5cfe92a080b891b6a9a25542c5f4
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1394 bytes
SHA-256: c99c0560b8e3c58adfaa4748e0fc77422663b84011afa57de4fa5d80e5aa1844

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