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

Static analysis result for SHA-256 675a33dd889e6b6b…

MALICIOUS

Office (OOXML) / .XLSX

602.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-25
MD5: 772c8e164c5ebb98fcfac2c82caf63fa SHA-1: ab7518b14ee52cd0492fceb97a3c013a8843a8e1 SHA-256: 675a33dd889e6b6b9e0c293ddf67e9148e57f1156f05ea64cafc3d351cf3b00a
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 Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size difference, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. The presence of a NOP sled further supports the execution of shellcode.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/gbS24.IBs7 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
d880a99dd261cf1d6120cf18f69a94e0cf0204b2fdaf6cf420a0a37ca31e361b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/gbS24.IBs7 864256 bytes
ooxml_oleobject_00_ole10native_00.bin
e563a59d5db44babcc8b4540c08f9a65670cfd4880a662bc64ab2b649e9f969d		 ole-package OOXML xl/embeddings/gbS24.IBs7 Ole10Native stream: oLE10natIVE 854886 bytes

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