Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c8cbf251b28ba79f…

MALICIOUS

Office (OOXML)

13.1 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2020-09-15
MD5: 26974035c6641620392d13c362cbcea5 SHA-1: 30b12ac4b7cf9571c25c6416e590e3c479e1eb6c SHA-256: c8cbf251b28ba79f621bf4779216bbc46cd3566a0b76621b036ca09b0cfb0ffd
100 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. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, a known vulnerability in Equation Editor that allows for arbitrary code execution. This technique is commonly used to deliver secondary payloads, hence the high confidence in an exploitation for client execution attack pattern. No specific family could be identified from the available evidence.

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: 948a42c09cf70d8aa747573c7b79bd52d8367cf7b73ac04dd2fa4adc1f25365a
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10naTiVe 1925 bytes
SHA-256: ed33bf0150d4e9e088c8b5edf7a681c5f99a003f26cea7989377d8178fc46cae

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