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

Static analysis result for SHA-256 031ca9695c177f7f…

MALICIOUS

Office (OLE) / .XLS

192.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-03-28
MD5: 420442e8c24f90d1cf29579b6c4de21a SHA-1: 128890d9359087fd3efcbade23d92a2ea77a9827 SHA-256: 031ca9695c177f7f51b25e2b4b7f170929df5aa750fae46cb70aaab0f65dfe32
108 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing an embedded Equation Editor object that exploits CVE-2017-11882. This vulnerability allows for arbitrary code execution when the object is processed. Although no VBA macros were found to be executable, the presence of the vulnerable OLE object strongly indicates an attempt to exploit this known vulnerability for initial access. The embedded OLE object likely contains the second-stage payload.

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
9f4b565de9c14ac252b7ed0e887e6346c3d6137393b9fbaa603520b83a381296		 ole-package OLE Ole10Native stream: MBD00499BB6/OlE10natIVE 1516 bytes

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