Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 f4f81302b10960eb…

MALICIOUS

Office (OLE) / .XLS

1.19 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 1654cb06f16f58bf077d947a1b1f0d44 SHA-1: 3d31709fbf1f62c1730c408e9404509ca915dd43 SHA-256: f4f81302b10960ebaea07666c3aa2d2147e093ba00c559a81d125f95c2230835
108 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 URL 'https://loooooooooooooooooooog.com/Biki'. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document is designed to trick the user into opening a password-protected archive, likely containing the actual malware, to evade gateway scanning. No VBA macros were found to be executable, but the presence of the OLE vulnerability and the archive lure strongly indicate a malicious intent to download and execute a second-stage payload.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes

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