Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f97d23776e6cb7e3…

MALICIOUS

Office (OOXML)

146.1 KB Created: 1999-06-21 05:11:30 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2019-06-27
MD5: 8fc0262962fa8bf775fccd4a0ef75ca7 SHA-1: 188a742e76eecae2c9276a3ef22b962b2849f6ca SHA-256: f97d23776e6cb7e3f24b7c09f117e5ce1bfe98521549f37f7013bd2db109762a
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: ef9bc946dcffc8aecd6754807fccd6e522dc56f3c3b2cbb1c5984e4680f7ec5c
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10NativE 1745 bytes
SHA-256: 786acec00d9c18e2f6f18b83d36a10bd98b98ae4895e0ddfe43d231d2e460d4a

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