Office (OLE) / .XLSX malware analysis — malicious · a3fddc5f8fdb4f12

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 1048471113b938176f93411516da0960 SHA-1: 42711353d0c65d1d7e7b16fceb81d6d23a08d286 SHA-256: a3fddc5f8fdb4f125ad3604d28d603947a6ccf1dacbc1fbb910d3c773f70dcbe

68 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.005 Visual Basic

The critical heuristic firing indicates the exploitation of CVE-2017-0199 via an OLE2Link object, which is designed to download and execute a remote payload from the provided URL. The VBA macros, while not containing executable statements directly, are part of the exploit mechanism. The extracted URL is the primary indicator for the second-stage payload.

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 1

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

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