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

Static analysis result for SHA-256 b70dd1f41b430ada…

MALICIOUS

Office (OLE) / .XLS

569.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-17
MD5: cdfdce0558d5657285a3241ae8369d1f SHA-1: 0ff871a2d19f03f3c48b6214bddd7df27cd6b01d SHA-256: b70dd1f41b430ada55a452d8a975bc6a4e01f6c461ec1b559c1ab7e315022ed0
108 Risk Score

Malware Insights

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

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the file contains a payload exploiting this specific vulnerability. The presence of an OLE Equation Editor object further supports this. While VBA macros are present, they appear to contain no executable statements, suggesting the primary malicious mechanism is the embedded OLE object. The file is likely a downloader or initial access vector leveraging this 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
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
76a02473044d12b6304f6fe685423bceabf8edb94f76a24ac264af62d6065ddf		 ole-package OLE Ole10Native stream: MBD01B0BA02/OLE10NatiVe 1698 bytes

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