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

Static analysis result for SHA-256 82c5854e1d7a8687…

MALICIOUS

Office (OLE) / .XLS

1.54 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-05
MD5: c4cac6cf54bc5a8f7f8a8346f6ffdb68 SHA-1: 23f7e4a6c0cc62b3e6ad06d5716618701ad73e0a SHA-256: 82c5854e1d7a868706a87d8551183978b41b8b7abac85c1149558bc7f7c1a357
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded Equation Editor OLE object. Heuristics indicate this object exploits CVE-2017-11882, a known vulnerability allowing for arbitrary code execution. No VBA macros were found to be executable, and the document body is minimal, suggesting the primary attack vector is the Equation Editor exploit.

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
f57313926fc15abba1c67e197d08fa3537b4201a32f696d3607aeb216a2c62a0		 ole-package OLE Ole10Native stream: MBD00C7EE60/Ole10Native 1696 bytes

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