Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 6de887246d06a203…

MALICIOUS

Office (OOXML) / .XLSX

613.1 KB Created: 2021-06-01 03:41:23 UTC Authoring application: Microsoft Excel 14.0300
MD5: 49d6b0ffcc6142e51b14e005c3490d4f SHA-1: deabb2c927cf31cc9e29a86abe5da55cac048bae SHA-256: 6de887246d06a2031eebc6e8dc7636cee8f8f9208e95363c06063ca7c61fa409
100 Risk Score

Malware Insights

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

The sample is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header, strongly suggesting it's used for exploitation. This technique is commonly used to download and execute a second-stage payload, leading to a high confidence in exploitation for client execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/9mvfHaB0.v0M contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • 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
22bb783a5a01678bb06d4a4a25ce808c161410aea82f4f46eb1e24ff306031ec		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/9mvfHaB0.v0M 911872 bytes
ooxml_oleobject_00_ole10native_00.bin
3d744c5c4feb9a128290b6a7d6f1a41af215f2ca3ebfad10b149d7a814c71b6a		 ole-package OOXML xl/embeddings/9mvfHaB0.v0M Ole10Native stream: ole10NaTive 902568 bytes

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