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

Static analysis result for SHA-256 a87bf2227d08c9b8…

MALICIOUS

Office (OOXML) / .XLSX

681.4 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-07
MD5: 8f19057c24c79cfd804408753a38fd2e SHA-1: 4abb164897b676a57f734662789857f3435bf177 SHA-256: a87bf2227d08c9b855a3f646b958e722ac3752951b658027304e879d09e7061c
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an OOXML document containing an embedded OLE object, specifically identified as a malicious Equation Editor object. This object carries a payload-like Ole10Native stream with an anomalous size, strongly indicating exploitation of a known vulnerability in the Equation Editor component to execute arbitrary code. The embedded OLE object is the primary vector for delivering the malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/8ReM.2SWJ7aA 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
e88aa5c5e1d65fd55c9e92f957e1ead244cc30c77f6e8322354a7a3e9644f57b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8ReM.2SWJ7aA 998912 bytes
ooxml_oleobject_00_ole10native_00.bin
fd5364e80a21d591458dd2812acdd76eb9aeb0b79f929ebe6aaa4f7380e89c39		 ole-package OOXML xl/embeddings/8ReM.2SWJ7aA Ole10Native stream: OLe10NaTIve 988540 bytes

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