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

Static analysis result for SHA-256 272b05fc0048aa15…

MALICIOUS

Office (OOXML) / .XLSX

606.8 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-17
MD5: bedeae328444f22738200d032c1ddba2 SHA-1: 4e2ac308bea0dda9836a69c7dac1814d6bfa5351 SHA-256: 272b05fc0048aa155bf2949ce55e8b3eaab27bf878008873f3d48e4bec215291
100 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as a Equation Editor object, which is known to be a vector for exploiting vulnerabilities. The high entropy and anomalous Ole10Native stream within this object strongly suggest it carries a malicious payload. The embedded object's path is 'xl/embeddings/dr0objLA.n1h'.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/dr0objLA.n1h 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
d19adc8be416edc2341080d293aa085dac43b82345ad2b0babd3d7483d1ccc4a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/dr0objLA.n1h 824320 bytes
ooxml_oleobject_00_ole10native_00.bin
c0f1f50e185abecb1316f78443af89753fc3e317b79ee3e91dc1886ece9ff52e		 ole-package OOXML xl/embeddings/dr0objLA.n1h Ole10Native stream: oLE10naTiVE 815581 bytes

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