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

Static analysis result for SHA-256 d561074d1b656f68…

MALICIOUS

Office (OLE) / .XLS

169.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-06-20
MD5: 4a3c8bd60db631e9a466e52b47553a0f SHA-1: 1cf5b21b8c8fe173ecc1764cc231fa7de696b812 SHA-256: d561074d1b656f683409a4a812f324f964b18d11b8847cd97bd12c2e31f78085
108 Risk Score

Malware Insights

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

The sample contains an embedded Equation Editor OLE object that is known to be vulnerable to CVE-2017-11882. This vulnerability allows for arbitrary code execution when the document is opened. No VBA macros were found to be executable, and the document body is minimal, suggesting the primary attack vector is the exploit itself. The embedded ole10native artifact 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
cf817a9f43c087cef3e39f19e9c306d1cd6d636bec6e0c517a2f9ecc42894e36		 ole-package OLE Ole10Native stream: MBD0049A76E/olE10NATIve 1422 bytes

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