Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 cc5ad18a1e837fe5…

MALICIOUS

Office (OOXML)

12.6 KB Created: 2020-07-09 10:28:27 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2020-09-07
MD5: 8660dfa581a856e1db11f5cb2b770c41 SHA-1: b2309824b4c0d9357edce15c1dd2f671df84127c SHA-256: cc5ad18a1e837fe5f8d08f5e5ef1c09f1e5ac0c6d59242af48cedc614b26ce7f
120 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object is anomalous and exploits CVE-2018-0798, suggesting it's designed to execute a payload. The extracted document body text appears to be unrelated technical specifications, likely a lure or obfuscation. No scripts were extracted from this sample.

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: c3c7367c5c2ca18e6e018c4d945f1905e1f24c5e9df108b64b0deeafb40444b2
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 1713 bytes
SHA-256: 325dc0772b63c727688250ab34cb51d765a523a467e7caa8d5cab1d2d0d6f374
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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