Office (OOXML) / .XLSX malware analysis — malicious · 09cad281d9244c7f

MALICIOUS

Office (OOXML) / .XLSX

2.90 MB Created: 2022-05-17 11:28:48 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2022-05-19

MD5: 818ff24894725126b446d31e6961358b SHA-1: 4d6485d76a79aa421eda06e2ad71528a1fce01c2 SHA-256: 09cad281d9244c7fde11862dcc5e2c815c0e40d9b5d4f2913523da65ec423e06

204 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1105 Ingress Tool Transfer

The sample contains an embedded Equation Editor OLE object that exploits CVE-2018-0798. This object contains a downloader shellcode that uses URLDownloadToFileA and WinExec to fetch and execute a payload from http://qrmpnobsac.sy/ex/TIARAS.exe. The presence of these APIs and the URL strongly indicate a malicious downloader.

Heuristics 7

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/QosT5xK.bKqZC 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.
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
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://qrmpnobsac.sy/ex/TIARAS.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `d6b72790726b64934db43be4b209274d118d2680335781685f72bb219fc586af`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/QosT5xK.bKqZC	2933760 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.96, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `142b978793dd7e714880ce03130c06a8464d7908217c6a42c47de506c41f7aeb`	ole-package	OOXML xl/embeddings/QosT5xK.bKqZC Ole10Native stream: oLE10Native	2908570 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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