Office (OLE) / .XLS malware analysis — malicious · 604017830c520afe

MALICIOUS

Office (OLE) / .XLS

865.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel

MD5: 15c632a5bb99baed87837075929d0e6a SHA-1: 6a33847ae0a957925e2b012623120cde4b6ef356 SHA-256: 604017830c520afed1e339fec58286d09494b7f63243d4aab8acbcd30fc34cf0

68 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.005 Visual Basic

The file is an Excel spreadsheet containing VBA macros. A critical heuristic identified the exploitation of CVE-2017-0199, which is used to load remote content. The VBA macro itself does not contain executable statements, but the heuristic indicates the exploit is present and points to a URL that likely hosts a second-stage payload. The embedded PDF and font streams are likely part of the exploit chain.

Heuristics 2

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.
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.

Extracted artifacts 3

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
`stream_005_off00002a81.bin` `d56409027eee90c8c32867250565ef14f289616fec1ade6fee19d8f8c637e73b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x2A81	37680 bytes
`font_00_sfnt_off00000eff.bin` `52ee3a62c61e3a8aa25a9b2c5fe2a58daec78a7ecfda9e2fc788a4d6abdbbf35`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFF	13464 bytes

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