Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 603d55609e653d9f…

MALICIOUS

Office (OOXML)

11.8 KB Created: 2019-01-18 02:14:52 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2020-05-25
MD5: 5c767baa598aafff233468ef63f67a6b SHA-1: c40c6bccf9964f7be04a2cced6691d076e1cf08d SHA-256: 603d55609e653d9fe7c485bbb5b87b14e4b5e45715ff3aab057da925ed3bba4a
100 Risk Score

Malware Insights

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

The sample is an OOXML file containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, a known vulnerability in Equation Editor that allows for arbitrary code execution. This exploit is likely used to download and execute a secondary payload, making the document a malicious attachment.

Heuristics 3

  • 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

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: 486ceb1f3c9e565a4168966d3d6de36d1f044d615bd9129910ea5e7d3fab8081
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10NAtive 1687 bytes
SHA-256: 72b3524c4af98d48adb18fdb306b4a1f6a0e8a5a1690f04a5f80bdd539edb7cc

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