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

Static analysis result for SHA-256 d73bc8a4a2ff6f0a…

MALICIOUS

Office (OLE) / .XLS

1.43 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-14
MD5: b5547f55277c3ab3a717ad3610a149ba SHA-1: 460d28805b766e5d67bf1e323405c9df23322e48 SHA-256: d73bc8a4a2ff6f0a76673d3b692e4209b0be25f60eba5ab449803647b10c9bfa
168 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 PowerShell

The sample is an Excel file containing an embedded Equation Editor OLE object, which is known to be vulnerable to CVE-2017-11882. This vulnerability allows for arbitrary code execution when the object is opened. The ClamAV detection name 'Xls.Downloader' suggests the payload is likely a downloader for further malicious content. No VBA macros were found to be executable, but the OLE object itself is the primary attack vector.

Heuristics 4

  • Equation Editor Ole10Native payload — CVE-2017-11882 critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE
    An embedded Microsoft Equation 3.0 object (CLSID 0002CE02-0000-0000-C000-000000000046) carries an Ole10Native packager stream instead of the normal Equation Native/MTEF data. This is the weaponized Equation Editor RCE delivery shape used by CVE-2017-11882 / CVE-2018-0802 maldocs. The payload (font-record overflow + shellcode) is frequently encrypted and the stream name case-scrambled to evade scanners, but an Equation object holding an Ole10Native stream has no benign use.
  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Contains Equation Editor object — related to CVE-2017-11882 / CVE-2018-0802 exploitation, but CLSID presence alone is not the malformed MTEF exploit primitive.
  • ClamAV: Xls.Downloader.94c25b356b5a6cac-9978798-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.94c25b356b5a6cac-9978798-0
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
f3d78e1d84099885da4240d5f79277d014e8d4856cbcdb797e223a62423310ce		 ole-package OLE Ole10Native stream: MBD0145D223/OlE10NATivE 1345 bytes

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