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

Static analysis result for SHA-256 cf30c9ba71f92e28…

MALICIOUS

Office (OLE) / .XLS

746.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-23
MD5: 2cf0f0d6ef7b592f66a3b8cc3cd3c20c SHA-1: 04d72a1e89a226f5daa87042d3f8eec70b89f535 SHA-256: cf30c9ba71f92e288ed0a568e45cd59baa5ec43d072179ccf1110649d9953295
108 Risk Score

Malware Insights

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

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within the Equation Editor OLE object. While the VBA macros themselves contain no executable statements, the embedded OLE object is the primary vector for exploitation. This suggests the file is designed to execute arbitrary code via this vulnerability, likely leading to a secondary stage download or 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
90decd0207839e972a1018d2cc115f6ce6295c23f2e33d321e56c0c39766e31e		 ole-package OLE Ole10Native stream: MBD024E3A27/oLe10NativE 1952 bytes

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