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

Static analysis result for SHA-256 45dc20198d5cba40…

MALICIOUS

Office (OOXML) / .XLSX

758.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2024-05-28
MD5: 80048da2613d09f53c61009172b8ba48 SHA-1: 5d0d4c402f2781566e4676249a34ee9b4827241e SHA-256: 45dc20198d5cba40867cdc3a781d40b67dfb2ba59426e3ebbac5b5a4ff86a12a
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object, which is a known vector for exploiting vulnerabilities. The heuristic 'OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY' indicates that this object carries a payload-like stream with an anomalous header and a significantly larger declared size than the actual stream, strongly suggesting it contains shellcode. The document body presents a fake invoice, likely to lure the user into opening the malicious object.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/zpMYmBU.riqEp 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
6d10e389940cc10345656e214f6a06360cd37ba24b2c772a941d9512956baa7f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/zpMYmBU.riqEp 1047040 bytes
ooxml_oleobject_00_ole10native_00.bin
df3e3d23e60d6d3a2046656d4bb86322e920d39af10cd0c6f577dee2049daecd		 ole-package OOXML xl/embeddings/zpMYmBU.riqEp Ole10Native stream: olE10nAtive 1036725 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.