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

Static analysis result for SHA-256 7180196fcf42ce4e…

MALICIOUS

Office (OOXML) / .XLSX

725.2 KB Created: 2022-05-16 17:34:45 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-07-18
MD5: 286e591d32c4c67c5c8d47056a529e55 SHA-1: e763f9d933ec7e2e632dd5a5df30da1b1204cdb0 SHA-256: 7180196fcf42ce4e2d40026844889ede2b804fa71adffe5f61016b0d79d56950
160 Risk Score

Malware Insights

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

The sample is an Excel document identified as malicious by ClamAV. It contains an embedded OLE object, specifically an Equation Editor object, which is a common technique for delivering malicious payloads. The anomaly in the Ole10Native stream size suggests the object is designed to exploit vulnerabilities or deliver a secondary stage. The file's SHA256 hash is provided as a primary IOC.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/qOGUzvv.bjv 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
fffb48173a68b7d78bc4703368161d25d6a81d531ed440eaffa86e2c6c4fd1d7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/qOGUzvv.bjv 799232 bytes
ooxml_oleobject_00_ole10native_00.bin
fe4a8674a7225f09391917a1b34e373218caeea99943a566a8af9875ca094b6b		 ole-package OOXML xl/embeddings/qOGUzvv.bjv Ole10Native stream: Ole10NatIVe 790436 bytes
emf_00.emf
38f17a599ac5d645df3840bbb401710ef81573a747da20abbfc1b7d9a9273b58		 ooxml-emf OOXML EMF part: xl/media/image1.emf 169096 bytes

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