Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 12fbd4023acca5e7…

MALICIOUS

Office (OOXML)

9.4 KB Created: 2018-08-29 14:23:22 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2019-01-11
MD5: e8a5b68bea9086ce0380b04b3e6475e0 SHA-1: 08bcd5494205f074a2ac890d3bf32f92e0eac50f SHA-256: 12fbd4023acca5e7ce765d44fc3da092cc1d8bd469e0cf70caaeba431a42a82e
100 Risk Score

Malware Insights

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

The sample contains an embedded OLE object identified as a Microsoft Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which allows for arbitrary code execution. This is a common technique for delivering malicious payloads via spearphishing attachments.

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: 33b10d5e1dadd3cf399921b5afc480cc1fb29ec85af1c565297eba34174f6085
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NatIvE 2011 bytes
SHA-256: da9892b750e5f16b488ae8af61cd6a624a13501bf29e8441cb7eee1bb185273f

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