Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 111e1fff673466ce…

MALICIOUS

Office (OOXML)

169.8 KB Created: 2007-12-12 07:39:31 UTC First seen: 2019-09-30
MD5: f082f44b0f4e52c44a6116e34ecb2a78 SHA-1: a2b75fce3fc2baf11eae550d05aa1fbe170be546 SHA-256: 111e1fff673466cedaed8011218a8d65f84bee48d5ce6d7e8f62cb37df75e671
248 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV, specifically as a dropper. Static analysis reveals an embedded OLE object, which is a known vector for exploiting vulnerabilities like CVE-2018-0798. The document body mimics a proforma invoice, suggesting a social engineering lure to encourage user interaction with the malicious object. The embedded OLE object likely contains shellcode or a secondary payload designed to execute.

Heuristics 6

  • 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.
  • ClamAV: Doc.Dropper.Agent-6544736-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6544736-0
  • 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.
  • 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: 469c4fe7a055eb6b4d2671be218526f67c1e417deb9b7c4f3339f71e4c4ec2b8
Detection
ClamAV: Doc.Dropper.Agent-6544736-0
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 2016 bytes
SHA-256: 691b487ff1a5ec0fe52b01b63a7b0d6d4d0142a7cfa3b1263e635205d7bcf7cb
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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