Ole2.Exploit.ZxxZDownloader — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 14986da600df26fd…

MALICIOUS

Office (OOXML) / .XLSX

11.2 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-05-13
MD5: 98ed55d0388130077a6e4f45b2dd6458 SHA-1: 83e87be33f31fa21d21b605765debbe5e30768b2 SHA-256: 14986da600df26fdb4e435cf01b6be4e5fffcc001059609070a2de701496bdde
180 Risk Score

Malware Insights

Ole2.Exploit.ZxxZDownloader · confidence 95%

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

The critical ClamAV heuristic firings indicate the presence of a known exploit targeting the Equation Editor OLE object. This exploit is designed to download and execute a secondary payload, consistent with the 'ZxxZDownloader' family name. The file was likely delivered as a spearphishing attachment.

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: Ole2.Exploit.ZxxZDownloader-9944376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Ole2.Exploit.ZxxZDownloader-9944376-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
3f830ed9ee01723d72599bf392c1c29f6de45c625d0664e7fbb31dd39f25ce8e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 6656 bytes
Detection
ClamAV: Ole2.Exploit.ZxxZDownloader-9944376-0
Obfuscation or payload: unlikely
ooxml_oleobject_01.bin
09ab6c897e7424943d062a4f802e19c03157d7fa773db6d48aa2a5de9f3b5e64		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 6656 bytes
Detection
ClamAV: Ole2.Exploit.ZxxZDownloader-9944376-0
Obfuscation or payload: unlikely
emf_00.emf
60ca1ffcf67457bab82b81f21ee94ca947dc99c8a077df1398db489a7cee22b5		 ooxml-emf OOXML EMF part: xl/media/image1.emf 6040 bytes

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