Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 28cdc075a11ca50d…

MALICIOUS

Office (OOXML)

15.0 KB Created: 2004-08-16 18:44:14 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2019-01-12
MD5: 266112c0a2591ed140b868c03d097407 SHA-1: 64afe4cac6ad47b2c48c054ed05dd673621f3a5e SHA-256: 28cdc075a11ca50d82b0663505eda072518f9d4c477a363796143d0bf21acd80
128 Risk Score

Malware Insights

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

The sample is an OOXML document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798 due to anomalous Equation Editor native stream properties. The document body contains invoice-like text, suggesting a lure to encourage user interaction with the malicious embedded object.

Heuristics 5

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators

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: fec61ec05a6f861d42e00f0d528f394d49a0e6ec3aff9e334b355c291b24a3f4
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1900 bytes
SHA-256: b87929dbea2e37540b3b4b13ed99b9ac5860ead3a7762423a7154903634e6b49

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