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

Static analysis result for SHA-256 dff2d8523bb91273…

MALICIOUS

Office (OOXML) / .XLSX

652.9 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-09-20
MD5: acc8c0639c3b24b4edcff602fc60b544 SHA-1: c5749c907020c22feec9e2408d4bd6cc1f7983b6 SHA-256: dff2d8523bb912730f48ac60b9874672106c87e0b4ff95069ded5c50ad40516e
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 Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size discrepancy, strongly suggesting exploitation of a vulnerability within the Equation Editor component. The presence of a NOP sled further supports the likelihood of code execution.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/eHzB7UgOv.4HFHKv 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
c118aa868eaaaa4f1621c40051e163a47de823df096a24fee686523c4c010651		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/eHzB7UgOv.4HFHKv 894464 bytes
ooxml_oleobject_00_ole10native_00.bin
0464f8738cf563bfbe11b830b686c9f093dfc8e7e38357c35bc6bf21577e4add		 ole-package OOXML xl/embeddings/eHzB7UgOv.4HFHKv Ole10Native stream: OLE10NAtivE 884957 bytes

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