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

Static analysis result for SHA-256 8a0b82f010c3be5f…

MALICIOUS

Office (OOXML) / .XLSX

587.4 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-30
MD5: bd4a9436af5d9b80f953ea780d28309b SHA-1: 0cafd6b571ea928d67471068c8eede7a98c1c5c6 SHA-256: 8a0b82f010c3be5f018ff31fdc9ec037306ac41dc815a4132110c479862303bb
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 Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting it is being used to exploit a vulnerability. This is a common delivery mechanism for malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/fXgBN.hUeEE 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
ca7e878affde2756d2806a74c091bf08ff66fd9464622bd968a0fb9a44e98e30		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/fXgBN.hUeEE 879616 bytes
ooxml_oleobject_00_ole10native_00.bin
0e41a5b6484b562536341ac0ce75d06052aa6f5bed7d07dc420fabb63bcdfe07		 ole-package OOXML xl/embeddings/fXgBN.hUeEE Ole10Native stream: OLE10NatiVE 870077 bytes

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