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

Static analysis result for SHA-256 bf24e30a6d72228d…

MALICIOUS

Office (OOXML) / .XLSX

117.9 KB Created: 2020-08-17 09:05:28 UTC Authoring application: Microsoft Excel 16.0300
MD5: 04f6ce1e170147d6980d44c6aa0aa144 SHA-1: 770366cfb401a4955b7d15cabbffcb354bc05502 SHA-256: bf24e30a6d72228d3344965df6a6e2663f58d50ec692b9e2c3956039148761d7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious Attachment T1059 Command and Scripting Interpreter T1059.003 Command and Scripting Interpreter: Windows Command Shell T1105 Ingress Tool Transfer

The critical heuristic OLE_EQUATION_OLE10NATIVE_DOWNLOADER indicates that the Equation Editor OLE object contains shellcode designed to download a second-stage payload from the URL http://www.medyanef.com/sistem/files/ago.exe. This shellcode utilizes functions like URLDownloadToFileW and CreateProcessW, strongly suggesting an intent to download and execute malware. The exploitation of CVE-2018-0798 further supports this malicious activity.

Heuristics 4

  • 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.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • Equation Editor object carries Ole10Native downloader shellcode critical OLE_EQUATION_OLE10NATIVE_DOWNLOADER
    Embedded OLE object declares the Equation Editor CLSID and its Ole10Native stream contains downloader shellcode API strings plus a remote URL. This is high-confidence exploit payload evidence, but it is not assigned to a specific Equation Editor CVE without a matching malformed MTEF/Equation Native primitive.
    URL http://www.medyanef.com/sistem/files/ago.exe
  • 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
b4536cdee53dca7df7111cd58e9b2143a5732723051300d122d3a534aaec7b17		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
18d015b54ed21181c444b94b7bd9010c795b31b001fb3ac18029bd8240e3c146		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NATIve 1557 bytes

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