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

Static analysis result for SHA-256 ac566b4758d2e07b…

MALICIOUS

Office (OLE) / .XLS

511.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-15
MD5: bee73fe64caf2d43205ffeaa3cc2a5cf SHA-1: 15c500b424a2465b876084545b13fcf097b516e8 SHA-256: ac566b4758d2e07b5f1a602c65101ede2230f145ad17fbc99d688017a9c0fa2b
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link T1059 Command and Scripting Interpreter T1059.005 Visual Basic

The critical heuristic firing for CVE-2017-11882 indicates the exploitation of a vulnerability within the Equation Editor OLE object. This exploit is designed to execute a payload, likely a secondary stage downloader or malware. No VBA macros were found to contain executable statements, and no document body text was available for analysis, but the presence of the Equation Editor exploit is sufficient evidence of malicious intent.

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
1a8aa1a27dd79cd3d87d81a85a7f78e2c7af425907d8b44eef71099b102bfc96		 ole-package OLE Ole10Native stream: MBD017831F6/OLe10nAtiVe 1687 bytes

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