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

Static analysis result for SHA-256 d8a0d4816ce47ae9…

MALICIOUS

Office (OLE) / .XLS

172.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-04-14
MD5: 2cc3e8aa774e98c52a76e9f199e29e8f SHA-1: 01bbb483ab346d27a05a90da22fe17ca1c0887f3 SHA-256: d8a0d4816ce47ae9816d41c983045681fe254ab6d43ec81e4e2d33a16048728d
108 Risk Score

Malware Insights

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

The sample is an Excel file containing a malicious Equation Editor OLE object, which is a known vector for exploiting CVE-2017-11882. This vulnerability allows for arbitrary code execution when the object is processed. No VBA macros were found to be executable, but the presence of the OLE object strongly indicates exploitation.

Heuristics 3

  • 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.
  • 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
d0b242331f430f9bf17b6d01eeee29082eec1c9a715b042b1f8743c429d3b158		 ole-package OLE Ole10Native stream: MBD003E62D7/OLE10nAtIVe 1907 bytes

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