Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 858b0d7863a8d098…

MALICIOUS

Office (OOXML)

146.0 KB Created: 1999-06-21 05:11:30 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2019-01-12
MD5: 5be9e7c2b80641784afc3baec5ec5544 SHA-1: efc57650fc1400e501939bb5a534c1cc4a978af0 SHA-256: 858b0d7863a8d098d724390ed1ef4ed72d86d954004bebb2bb2c48fab0f0a473
128 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 identified as an Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, a vulnerability associated with anomalous Equation Editor native streams, which is often exploited for arbitrary code execution. The document body appears to be a packing list, likely a lure to disguise 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.
  • External relationship medium OOXML_EXTERNAL_REL
    External target in xl/externalLinks/_rels/externalLink1.xml.rels: /Malwee- master folder/Master file/Malwee '15/Packing list sammar'16/Invoice & packing list for BULK ---qnty25000------
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 6 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction

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: 9835b7c904c3518a76d67bd0e0e9507d8962d25f464900757bc477d737f85cb0
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10NatIvE 1616 bytes
SHA-256: 120b0e4b761132160a65ecb56da43552d3a9ea33dff583def9c477e1bd545fd0

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