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

Static analysis result for SHA-256 77a2cddd040aee76…

MALICIOUS

Office (OLE) / .XLS

1.54 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-05
MD5: 3237c103d03b7c263d368b07aaf276bc SHA-1: e0b3781099faef365d896f9720e2e1b2f8f8e52e SHA-256: 77a2cddd040aee769ad6a806b24f4e1be3228a8477a66aab39664c6b4b1fc6bf
108 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded Equation Editor object that exploits CVE-2017-11882. This vulnerability allows for the execution of arbitrary code when the object is processed. No VBA code was found to be executable, but the presence of the exploit object is sufficient for malicious execution.

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
1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2412 bytes
ole10native_00.bin
34feb3bc4bf622a82a682d541108d148326a23e7236b56125ab2a8696ac1ef91		 ole-package OLE Ole10Native stream: MBD00B65AA6/oLE10NAtive 1291 bytes

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