Office (OLE) / .XLS malware analysis — malicious · 3f56119af8fef0b7

MALICIOUS

Office (OLE) / .XLS

104.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-03-22

MD5: aa99836643f0b2c8fc39939ec3ee27f3 SHA-1: f0dacaacefb80336e67725d4a555b2aa243994e8 SHA-256: 3f56119af8fef0b7f8f213be2f3b681225181166cd3cd9594f4f4a2977beba34

70 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.005 Visual Basic

The critical heuristic firing indicates exploitation of CVE-2017-0199 via an OLE2Link object, which attempts to download a remote payload from the provided URL. The embedded URL is reconstructed as http://OASOSIDFOSWEROEROOWRWERWEREWWW0W83W338W83WOWRWWRWRWRW9W9R9W9R9WR9W9RW9R9W9R9W9R0WR7RR7W7RW7RRW7R66WSD6DSD6S6D6DSD6DSD66D6S@172.245.123.113/18.........................18.......doc. Although no VBA code was found to be executable, the OLE structure itself facilitates the exploit. The presence of the URL and the CVE exploit strongly suggest a downloader or initial access mechanism.

Heuristics 3

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.
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://OASOSIDFOSWEROEROOWRWERWEREWWW0W83W338W83WOWRWWRWRWRW9W9R9W9R9WR9W9RW9R9W9R9W9R0WR7RR7W7RW7RRW7R66WSD6DSD6S6D6DSD66D6S@172.245.123.113/18.........................18.......doc

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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