Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 b0057630ae190609…

MALICIOUS

Office (OOXML) / .XLSX

618.3 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-06
MD5: 52e5e9fada46944f5f9b87a330368c2e SHA-1: de125e4c33d98e422c6503d959673277daf3c5ec SHA-256: b0057630ae190609bb96178c461d930c060a75c7759ccd9c4c0a66b149a4bae6
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File T1027 Obfuscated Files or Information

The file is an OOXML document containing an embedded OLE object, specifically identified as a malicious Equation Editor. This object exhibits anomalies in its Ole10Native stream, suggesting it carries a payload. The presence of a NOP sled further indicates shellcode execution is intended. The document body appears to be a fabricated purchase order, likely a lure to encourage the user to interact with the malicious embedded object.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Hal.zHW89o contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • NOP sled detected high SC_NOP_SLED
    Found 20+ consecutive 0x90 bytes
  • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
4a2f771263d910a464f0b5d465e2a3f958ef557411f65c7fa54b7bd31277e5be		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Hal.zHW89o 869376 bytes
ooxml_oleobject_00_ole10native_00.bin
56b492cbb2a6e35b923f16ff5fb32d558955abf79964ccae8d6fe21e6091e476		 ole-package OOXML xl/embeddings/Hal.zHW89o Ole10Native stream: oLE10NATIVe 859801 bytes

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