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

Static analysis result for SHA-256 f7dd16723f89b817…

MALICIOUS

Office (OOXML) / .XLSX

678.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-30
MD5: 740124ddf4656f6c493b16764b3802a5 SHA-1: 84483c72fb51f3d3963de0b9556f65f87652e6e2 SHA-256: f7dd16723f89b817bb7ccb7c0ea7a7182c2fa1fa16a037b89429940fb6ccdf34
140 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The sample is an OOXML file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. High-severity heuristics indicate that this object carries a payload-like stream, suggesting it's used to exploit a vulnerability. The presence of a NOP sled further supports the exploitation of a buffer overflow or similar vulnerability.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Jv6j.BmZ contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • NOP sled detected high SC_NOP_SLED
    Found 20+ consecutive 0x90 bytes
  • 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
9b6447d9d7646931b4c2e3bb9cda4ad78d314ee7e2454fb073e8a68bd48cf720		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Jv6j.BmZ 932864 bytes
ooxml_oleobject_00_ole10native_00.bin
e14e8634d9fdcff37d1a4e803edc76fdd6219f539fa570d033d6e18e0248228e		 ole-package OOXML xl/embeddings/Jv6j.BmZ Ole10Native stream: oLE10natIVE 922682 bytes

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