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

Static analysis result for SHA-256 132c22c112f58ac4…

MALICIOUS

Office (OLE) / .XLS

393.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-08
MD5: d24d0a41bba7527e8dcbcd67dad43bfe SHA-1: 79b15f9dd226d7514576d4c7b4a2b128302cf66e SHA-256: 132c22c112f58ac411b7fb5032694b111424b2fcab32cd0acdc2fc10f7d3a1ef
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing indicates the presence of a CVE-2017-11882 exploit targeting the Equation Editor OLE object. This vulnerability is commonly used to execute arbitrary code. No VBA macros were found to be executable, and the document body was unreadable, suggesting the exploit is the primary mechanism for payload delivery.

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
f603e53a253729ad0475b7d797bd7490a1aff4a02bf7747ca4e05072ce2c8b38		 ole-package OLE Ole10Native stream: MBD01575CF2/oLE10NatIve 1348 bytes

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