Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 221009a23efb919b…

MALICIOUS

Office (OOXML)

10.6 KB Created: 2019-12-16 19:20:18 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2020-05-25
MD5: 120c45e0e71a3878fd40966c40f52c4d SHA-1: 5fc5e6c3323d5e3bc613aefe06e8c6a591e93403 SHA-256: 221009a23efb919bdff852b971431558b118ee95f33f4b720bb1cfab2e8ef517
120 Risk Score

Malware Insights

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

The file is an Office document containing an embedded Equation Editor OLE object, which is known to be exploited via CVE-2018-0798. The document body contains a lure instructing the user to enable editing to view an image, a common tactic to bypass macro security. This suggests the file is intended to exploit the embedded object to execute a payload.

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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

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 3584 bytes
SHA-256: e10b4f837046ce180a06e34ce79c5fd0631a06d167e362e3a099b9e45f45455c
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10NatIVE 1399 bytes
SHA-256: 6145e988f6417afef4962fab0680500ac018ff1d92a864e6fae5ba229602e6b7

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