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

Static analysis result for SHA-256 49c3bc581c5b1799…

MALICIOUS

Office (OLE) / .XLS

197.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-02
MD5: de63ed25962816b3341bf1da205263dd SHA-1: 116acf3e854e84970e023de48aff6dfe724b8b49 SHA-256: 49c3bc581c5b17995fb0cd5a063ad68092cc9b5e695d34dcd30213dc96086eac
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the presence of a known Equation Editor vulnerability. This exploit allows for the execution of arbitrary code, likely to download and run a secondary payload. The file is an Excel spreadsheet containing an OLE object, consistent with exploitation of this vulnerability.

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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ole10native_00.bin
4e2485905312fd0921bc6cb9547b4d9b3b1d5b5d8d633ce8d5d2118a2d76a6cd		 ole-package OLE Ole10Native stream: MBD03FAE3B9/Ole10natIVe 1328 bytes

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