Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 394d7bb0cec7f456…

MALICIOUS

Office (OOXML)

22.9 KB First seen: 2019-08-04
MD5: 692d5d9371421a350c11b95e8639cb12 SHA-1: 3ba4ad3c5c6cfb15b2cd944560e19ea989e1a68a SHA-256: 394d7bb0cec7f4567b9dbe59f94926441068826d760ca9b68062ffc2b8d87246
102 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample contains an embedded Equation Editor OLE object that triggers CVE-2018-0798. This vulnerability allows for the execution of arbitrary code when the object is interacted with. The embedded object's native stream shows an anomalous MTEF version and high entropy, indicative of exploit code.

Heuristics 4

  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://sanbs.org.za/ In document text (OOXML body / shared strings)
    • https://sanbs.org.za/donors/In document text (OOXML body / shared strings)
    • https://sanbs.org.za/donation-process/In document text (OOXML body / shared strings)
    • https://www.health24.com/Lifestyle/Your-Blood/Blood-donation-Client-20120721In document text (OOXML body / shared strings)
    • https://www.wpblood.org.za/?q=aboutdonation/becoming-donor/who-can-donateIn document text (OOXML body / shared strings)
    • https://www.healthline.com/health/benefits-of-donating-bloodIn document text (OOXML body / shared strings)
    • https://www.healthline.com/health/disadvantages-blood-donationIn document text (OOXML body / shared strings)
    • https://www.webmd.comIn document text (OOXML body / shared strings)

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: f9e6b0c8ed11aa8fde7e390f82dfdf397856c15dcd1e75cd914cc3f2ef3e1a98
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/EMBEddings/oLeOBJect1.bin Ole10Native stream: OLe10nAtIvE 1785 bytes
SHA-256: c5af2ec2c91f53caca3528d3ea27e063d3930f389c29bbdc6cd5af4e0e226e93

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