Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 11b910dd387ee95d…

MALICIOUS

Office (OOXML)

1.12 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-05-10
MD5: 543d5cfa0a2f199997670a4e5f864818 SHA-1: 9d249a84a1e3903146d7c3688598aae67e28fbd2 SHA-256: 11b910dd387ee95d834a157e1854301db8bdaba326e6114aa217dd3bfd967771
110 Risk Score

Heuristics 5

  • 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
  • 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.

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 1535488 bytes
SHA-256: 64e1314d2f594c2954620c355018476522943453952b5b8ff2a586bf93f05161
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 1520900 bytes
SHA-256: f7bfcd2cfafe65360c900b06396fb593106749574e01161bc1df7461e65c0804
ooxml_oleobject_01.bin ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 946688 bytes
SHA-256: b46672eac4e99f2f3fc7fc4b82fb9c07aba7947316ec513db2d3e37a0a4b3107
ooxml_oleobject_01_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10NaTIVE 936804 bytes
SHA-256: acfe6ac1af4960642b456cc928b5579c9265246dc0326968c0ef8129caa3a931
ooxml_oleobject_02.bin ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject3.bin 62976 bytes
SHA-256: a80f9b2214124984c27ca2275d98bed52c5033371dedff8c47ef8f1383a987f4
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.81, consistent with packed or encrypted content.
ooxml_oleobject_02_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject3.bin Ole10Native stream: Ole10Native 61235 bytes
SHA-256: b40c8d7fd5fac7d0ca1d2ebb998529c70f4ac361d06c8a788c19237e6b1f785b
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.88, consistent with packed or encrypted content.
ooxml_oleobject_02_ole10native_00_-..-.-.--.-.----_-_-_-_-_-_--_-_-----.---.-.-.-.--.---_-_------_-_-.docx ole-package-payload OOXML xl/embeddings/oleObject3.bin Ole10Native payload: display_name=-..-.-.--.-.----_-_-_-_-_-_--_-_-----.---.-.-.-.--.---_-_------_-_-.docx; full_path=C:\Users\sys\AppData\Local\Temp\-..-.-.--.-.----_-_-_-_-_-_--_-_-----.---.-.-.-.--.---_-_------_-_-.docx; temp_path=; def_file= 60386 bytes
SHA-256: 8e922125112d96fd8f30804f9ef8c480e013e069c3c65a4da6f779ba529772d3
emf_00.emf ooxml-emf OOXML EMF part: xl/media/image2.emf 3042216 bytes
SHA-256: 072a6a893b25f4848345ae02773b4dd141c43ec598f34f1da6844dabe6ca8a42
emf_01.emf ooxml-emf OOXML EMF part: xl/media/image3.emf 5364 bytes
SHA-256: 708a4bf257bd2b949e903f484a774dd4108782d68c60d99a74d1024b41c77669

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