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

Static analysis result for SHA-256 042ad5ae6b3d6a53…

MALICIOUS

Office (OOXML) / .XLSX

616.2 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-28
MD5: 92adcc178c2e64d497a705072b382ac0 SHA-1: 04890cf4c8ad62f74c6f88a4ca3055d27bf354db SHA-256: 042ad5ae6b3d6a530fe83abe685d97042c7ccff8279aaa37d8f7e8e53252d457
140 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model T1204.002 Malicious File

The file contains an embedded OLE object, specifically identified as an Equation Editor, which is a common vector for exploiting vulnerabilities. The heuristic 'OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY' indicates that this object contains a payload-like stream with an anomalous header, suggesting it's designed to execute malicious code. The presence of a NOP sled further supports the exploitation of a buffer overflow or similar vulnerability.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/MzWJ.GP 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
baa0e5d7ce38c8615fbad0c497d4f24f7428231a26e0d96f95a74fc0089c0b57		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/MzWJ.GP 871424 bytes
ooxml_oleobject_00_ole10native_00.bin
7c9a6ab01fc08692c87270b7afecef4ba98ab2d992b4b34bb94dab846bd845c5		 ole-package OOXML xl/embeddings/MzWJ.GP Ole10Native stream: ole10NaTive 861868 bytes

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