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

Static analysis result for SHA-256 a84ee6724fe8a8b3…

MALICIOUS

Office (OOXML) / .XLSX

2.00 MB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: aacb831a66dd3d1a8576b12e78b651d1 SHA-1: 12fe6d3e668fc7a8eff16ea26ac61385212a2a65 SHA-256: a84ee6724fe8a8b3b17c3f09bb33b0c61f70d1df96a3afae3aec45eccd1b0c58
80 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution: Malicious Link T1566.001 Phishing: Spearphishing Attachment

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. The document body contains text that appears to be a financial statement or inventory list, followed by a prompt to 'enable editing' and mentions of auditors' opinions, serving as a lure. This heuristic, combined with the embedded OLE object, strongly suggests a macro-based delivery mechanism. No scripts were extracted, but the presence of the OLE object and the lure indicates an attempt to execute embedded malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/mteRV0YE.dXuFu0u contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
d04e2e2dbb620ea15c10719d4dda8554c34e5624f2aecec3d73746e7bb822fd5		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/mteRV0YE.dXuFu0u 2799104 bytes
ooxml_oleobject_00_ole10native_00.bin
bf2d84e9d26589990ad685bdd28296ff540936f9f470f3b95efc66c855d4f1fa		 ole-package OOXML xl/embeddings/mteRV0YE.dXuFu0u Ole10Native stream: OLe10nAtivE 2774612 bytes

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