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

Static analysis result for SHA-256 027ad84058c49bcf…

MALICIOUS

Office (OOXML) / .XLSX

743.3 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: 22600d57c5c9b99fb6e58a8d0b9b4757 SHA-1: caf1917988e21deeda0a5d44da154cf0facc3d2e SHA-256: 027ad84058c49bcfc35ef73d675d7813002c74210d28bb970a78e047588f00d0
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 that this object carries a payload-like Ole10Native stream with an anomalous size and entropy, strongly suggesting exploitation of a vulnerability like CVE-2017-11882 for client execution. The document body content appears to be a list of parts or inventory items, likely a lure to disguise the malicious embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/sN.jaoA 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
3efab3fee9d2f09a249daadd23c5e445c937ea9f7d83b0cbfa6bbcb18233f641		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/sN.jaoA 1089536 bytes
ooxml_oleobject_00_ole10native_00.bin
bce90866391afb7fead679927ef6ce5ead829d8b8c2464889514fb79f108bdcf		 ole-package OOXML xl/embeddings/sN.jaoA Ole10Native stream: olE10NAtivE 1078578 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.