Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 661555be2eea1f6b…

MALICIOUS

Office (OOXML)

1.01 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-05-17
MD5: 65736b4f35dd38369a8defd0cbe29b55 SHA-1: 8da415b44d25d10636daa2fe0e613586955b9850 SHA-256: 661555be2eea1f6b2b8ef5ac72a60d7b721958c502c72683223ebbf643609f45
78 Risk Score

Heuristics 5

  • Equation Editor OLE object low 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.
🗂 Part of campaign: i8.ae 63 samples

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

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/oleObject3.bin 29696 bytes
SHA-256: acbd3d081180cf310b4d6ffa90e00445f3f98fc29b73188635c4f42eece97071
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.46, consistent with packed or encrypted content.
ooxml_oleobject_00_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_00_ole10native_00_......................................................................pptx ole-package-payload OOXML xl/embeddings/oleObject3.bin Ole10Native payload: display_name=......................................................................pptx; full_path=C:\Users\sys\AppData\Local\Temp\......................................................................pptx; temp_path=; def_file= 27140 bytes
SHA-256: f37b4a7566bd55386ec3329d873aa1d1cce22c77cde25064cb6c210121830b0c
ooxml_oleobject_01.bin ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 888832 bytes
SHA-256: 3b1ee7c01ea2609578bdaed1e1a8c045bd4b9ea9cc4d511f3b3cb86c16cea5c0
ooxml_oleobject_01_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10NAtive 879404 bytes
SHA-256: 3f4d6057b3c472cb740975c080cb67d1b1d10135e9504e0a6e5a79c51924042f
ooxml_oleobject_02.bin ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 1535488 bytes
SHA-256: cbae6484ac11a7c13dd9cb03019b43df94406e3408e4a2a08f06b62cf08969cf
ooxml_oleobject_02_ole10native_00.bin ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 1520900 bytes
SHA-256: f7bfcd2cfafe65360c900b06396fb593106749574e01161bc1df7461e65c0804
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 5376 bytes
SHA-256: 879d94d1591f417622934d4264766e6c8f2e1e1e41f902d54a37027acb6fec66

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