Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 16fb32e4e3bfe981…

MALICIOUS

Office (OOXML)

1.35 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-06-13
MD5: bfd44a73a2ba79eb4529a435b43a2758 SHA-1: 34b6ac94877a644e25db643dd7ab4b0a75049ee4 SHA-256: 16fb32e4e3bfe9814153323e07ca466f94698bc3c95d6af30e96c4be1de383d8
114 Risk Score

Malware Insights

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

This Excel document contains a high-risk embedded OLE object, identified as an Equation Editor, which is a common vector for delivering malicious payloads. The object's Ole10Native stream exhibits anomalies suggesting it contains executable content. The presence of a suspicious URL, http://www.day.com/dam/1.0, further indicates a potential download or command-and-control channel.

Heuristics 7

  • 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.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 1 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
  • Payload URL recovered from embedded OLE object (1 URL) info OOXML_EMBEDDED_OBJECT_URL
    An embedded OLE object (xl/word/ppt embeddings) carries a next-stage download URL in its Ole10Native/Package stream — stored literally (incl. UTF-16) or base64-encoded — which the package-level URL sweep does not see. Surfaced as an IOC; self-validating (only real payload hosts).
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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 http://www.day.com/dam/1.0 In document text (OOXML body / shared strings)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OOXML body / shared strings)
    • http://ns.adobe.com/tiff/1.0/In document text (OOXML body / shared strings)
    • http://purl.org/dc/elements/1.1/In document text (OOXML body / shared strings)

Extracted artifacts 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 968704 bytes
SHA-256: edaf9b1755b08f0772911ba97c32860a69fc0f6af31e830ab89b122082db915e
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10NATIve 958818 bytes
SHA-256: 72edf11a9f866cc8bc484a834789f0952c5ccc8c08e0860c6463a6c68857abaa
ooxml_oleobject_01.bin ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 3700224 bytes
SHA-256: 6d68d2df2625614e7efe7946694ab1be25b69f7f0e30cb085e14292463ee6faf
ooxml_oleobject_01_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 3668580 bytes
SHA-256: 079553d7ab4785a82155c9ad8a77bb8aac84989e54fd6ba4892bc43e2c43717b
ooxml_oleobject_02.bin ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject3.bin 29696 bytes
SHA-256: df4a6a402eaae9ab394dca4b96bd0b30734d8cc6017f75cc32c1bc77c4d4f9df
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.46, consistent with packed or encrypted content.
ooxml_oleobject_02_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject3.bin Ole10Native stream: Ole10Native 28007 bytes
SHA-256: d0e65243df358f9ee7948eadb2c9e55da3344dd9a0ee3fcc11d3188c924dc972
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.61, consistent with packed or encrypted content.
ooxml_oleobject_03.bin ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Microsoft_Office_Word_Macro-Enabled_Document1.docm 127576 bytes
SHA-256: c1ce22d40631fd96aa340b33b23865e91c6c0e493eec6054b450edd24cb87e05
emf_00.emf ooxml-emf OOXML EMF part: xl/media/image2.emf 7337552 bytes
SHA-256: 483bccb76820466fffb1bb06d3436d7b79b48f600cca539fd2f514120cd08d78
emf_01.emf ooxml-emf OOXML EMF part: xl/media/image3.emf 5376 bytes
SHA-256: abd5043a44d1d6c4dd4fc3509a4c5c6fe57b9e8956e427846fec5969fd0b223b
emf_02.emf ooxml-emf OOXML EMF part: xl/media/image4.emf 653280 bytes
SHA-256: cec78431e57e61cfdd561d6380769f684fad24e214eddc18e410e38090b40e47

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