Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 aaaaa148e9e9feef…

MALICIOUS

Office (OOXML)

74.1 KB Created: 2018-09-15 07:38:48 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2019-05-16
MD5: 3a924b3002915566cdd528b229ee8e4f SHA-1: 43d432c28e9d40f361b9963d393990e1883ce223 SHA-256: aaaaa148e9e9feef9209526e84f63c1f3603990418f8bd99b9716a4f6069ca1c
188 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical ClamAV heuristic 'Doc.Exploit.CVE_2017_11882-6934206-0' indicates the file exploits a known vulnerability in the Equation Editor. This vulnerability allows for the execution of arbitrary code, likely to download and run a secondary payload. The document body, while appearing to be a tariff proposal, does not directly contribute to the attack vector but may serve as a lure.

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.
  • ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators

Extracted artifacts 1

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: 52a3e518fdb188a1b6214a83c29b0056620a6f3ad878b05862c543f60f3d5d7c
Detection
ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0
Obfuscation or payload: unlikely

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