Office (OLE) / .XLSX malware analysis — malicious · 17858a8c35ae994f

MALICIOUS

Office (OLE) / .XLSX

199.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-07-21

MD5: 18d0cf3ac6768c183daa36a0dfe5fae1 SHA-1: 73dec52a3fdc29b4413317bcb8bd4bd6d7cefe3d SHA-256: 17858a8c35ae994fa5fce47559976bf02336bb5b2d0094445b22718803a4f3d9

112 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.005 Visual Basic

The critical heuristic firing for CVE_2017_0199 indicates the sample is designed to exploit this vulnerability, likely to download and execute a secondary payload from the embedded URL. The embedded PDF also contains suspicious findings, suggesting a multi-stage attack. No VBA macros were found to contain executable statements, but the primary exploit mechanism is clear.

Heuristics 5

OLE2Link / URL Moniker → remote loader — CVE-2017-0199 critical CVE likely CVE_2017_0199

Document contains an embedded OLE link object whose URL Moniker points to a remote URL. When the host file is opened, Office follows the link, downloads the URL, and processes the response based on its Content-Type (HTA -> mshta.exe, RTF → Word, etc.) — the documented CVE-2017-0199 primitive. The URL extension is not a reliable filter; servers can return different payloads to Office's user agent.
Secondary embedded PDF body has suspicious static findings high POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
VBA project contains no executable statements low OLE_VBA_MACROS

Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.
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://192.3.216.144/IBM/ROOTROOTROOOTROOOTROTROOTROT%23%23%23%23%23%23%23%23%23%23%23%23%23%23ROTTROTTROTTRORTTROTRTORT.DOC

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1206 bytes
`ole10native_00.bin` `68021b9c28ba7dcb7a15f759427b927a0992269e0ebee689d83f9273ef8088b2`	ole-package	OLE Ole10Native stream: MBD0017C392/Ole10Native	141697 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.92, consistent with packed or encrypted content.
`stream_001_off00000960.bin` `2998a126f4fa11ceb265371a5f7968ec18bc4692a32631a544232dc74040021f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x960	252488 bytes
`polyglot_child_pdf_off00000cb3.pdf` `a86005b7ff9529fe1b9eec2eacf01da3cbef193a78ffd39be231e21241cc09bb`	polyglot-child-pdf	Secondary PDF body inside ole container at offset 0xCB3	201037 bytes

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