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

Static analysis result for SHA-256 a2ba99d5d1fb2828…

MALICIOUS

Office (OLE) / .XLSX

288.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-07
MD5: c331493a8114f141e781d1e6ef313d8b SHA-1: 40efd1edbb958610037ac48bfea8efe1b42fb572 SHA-256: a2ba99d5d1fb282868cb3598dc25221aa4e14db381bfd0288be19ac452ca58fe
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within an Equation Editor OLE object. This vulnerability is commonly used to achieve arbitrary code execution. The embedded OLE object likely contains the second-stage payload, although its specific nature cannot be determined from the provided evidence.

Heuristics 2

  • 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ole10native_00.bin
45f657068376f276b7dda01e02d866e7cf3fdc7005aa897a5d8825fe12165aac		 ole-package OLE Ole10Native stream: MBD0168916A/Ole10Native 9818 bytes
ole10native_06.bin
be01ba544d4bd00d9156082317b9d9761107dafc14ad3f4b0549a8e092d1b467		 ole-package OLE Ole10Native stream: MBD01689170/oLe10NatiVE 1832 bytes

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