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

Static analysis result for SHA-256 7416db63fa07f02b…

MALICIOUS

Office (OLE) / .XLS

209.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-05-22
MD5: 521c7408ffe64b9dac4df886e79ec831 SHA-1: 0b3745e6c228df6fb84075e520dcd1ba41a4f061 SHA-256: 7416db63fa07f02b101da8477459d4e8489c01ffcab99e42e826a7c8a44957e2
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample contains a critical heuristic indicating the presence of a CVE-2017-11882 Equation Editor exploit. This vulnerability is known to be used 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 embedded OLE object.

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
4caccb1293b2e27570923147ae6e992cfa318c9ace01998a8e6d13885643432e		 ole-package OLE Ole10Native stream: MBD00937448/Ole10nAtivE 1857 bytes

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