Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 3202de77d8829cbb…

MALICIOUS

Office (OOXML)

128.9 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-05-26
MD5: e8a5c8ab1797fb0cbb3008f9e4de6c6d SHA-1: 7a1c046b79429c18a5cb5de188ce3c64346a29bf SHA-256: 3202de77d8829cbbb5358398a1d28326719692d178e253ed56b996aa562d3cbb
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an OOXML file containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate this object is anomalous and exploits CVE-2018-0798, a vulnerability in Microsoft Equation Editor, to achieve code execution. The embedded object likely contains shellcode, suggesting the document is intended to deliver a malicious payload upon opening.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
SHA-256: 54f2cf39267c41459cf007a2ebbe6c18481005c175490d56c872b81f08890f8a
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10NatIvE 1556 bytes
SHA-256: 8577653e869a03bbe841de002fb1592a73e780d2a72ad639a47154b51473fe38
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL

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