Office (OLE) / .XLS malware analysis — malicious · 8ca816015c1a43fa

MALICIOUS

Office (OLE) / .XLS

1.02 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel

MD5: 02312414e969b79f88ffde0b68090227 SHA-1: aab17d76b523a0a1c79391468885ab855a6f2196 SHA-256: 8ca816015c1a43fa8cfe732759ba029e176f94e372176ccb8940d91cfc6a7984

170 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The critical heuristic firing for CVE_2017_0199 indicates that the OLE object is attempting to load a remote resource via a URL moniker. The embedded PDF, while appearing image-only, is also flagged as suspicious. The primary intent appears to be downloading and executing a second-stage payload from the identified URL.

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.
ClamAV: Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0
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.
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `382fc1344a2f0cf6eda18645d41def8d571debc6637bc7fe02a5c83715a51bef`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2112 bytes
`polyglot_child_pdf_off00000e00.pdf` `661a6590973b34527e489b2334e3eb30e117b402a304f66efa6094b881e4c67b`	polyglot-child-pdf	Secondary PDF body inside ole container at offset 0xE00	1068032 bytes

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