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

Static analysis result for SHA-256 2aec9c85bc2bdeba…

MALICIOUS

Office (OOXML) / .XLSX

839.9 KB Created: 2022-05-16 17:34:45 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-07-29
MD5: e7bf305778c0d3c72589e98b322aeb98 SHA-1: 295b47aa200bd13d1cf2bbf835a3aeebe70bb08f SHA-256: 2aec9c85bc2bdebafa66abf9e78011076e1716bf3e46a137b34eef2c11935f8f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The critical ClamAV detection and high-severity heuristics indicate this Excel file contains a malicious OLE object, specifically an Equation Editor, which is designed to deliver a payload. The anomaly in the Ole10Native stream size suggests it's being used to hide malicious content, likely a downloader or exploit.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/QQkIp.Z6msRa contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • ClamAV: Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
63c701dd45800dbd4b6077b18f93e35e7661e90199b21fcab3f5ae6da7053f26		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/QQkIp.Z6msRa 971264 bytes
ooxml_oleobject_00_ole10native_00.bin
e626fa150610408d6ca9db8106a0af5723bee935a92ce5c894eb86dd0c2ebba1		 ole-package OOXML xl/embeddings/QQkIp.Z6msRa Ole10Native stream: OLE10native 961159 bytes
emf_00.emf
38f17a599ac5d645df3840bbb401710ef81573a747da20abbfc1b7d9a9273b58		 ooxml-emf OOXML EMF part: xl/media/image1.emf 169096 bytes

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